HomeMy WebLinkAbout220602-Ungaman Creek Hydro Feasibility Study, Final Report(small)
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Cover photograph: Oblique aerial view looking west of the confluence of the south and north
forks of Unga Man Creek (at left and right in photograph, respectively).
Courtesy of Bob Christensen of Living Systems Design, LLC. August 25,
2015.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report i
EXECUTIVE SUMMARY
In 2016 and 2017, the Aleutians Pribilof Island Community Development Association (APICDA)
hired Living Systems Design, LLC (LSD) and Polarconsult Alaska, Inc. (Polarconsult) to perform
feasibility‐level studies of a proposed hydroelectric project on Unga Man Creek near the City of
False Pass, Alaska (City). In 2019, the City assumed the APICDA study and expanded
Polarconsult’s scope to include additional hydrology, analysis, and reporting. This report
presents the findings of the feasibility‐level studies conducted from 2016 through 2021, and
makes recommendations for further action based upon the study findings.
The feasibility study described in this report finds that a run‐of‐river hydroelectric project on
Unga Man Creek is feasible from technical, regulatory, and economic standpoints. An installed
capacity in the range of 100 to 400 kilowatts (kW) may be practical, and a 180‐kW project is
recommended to best‐serve the City electric utility.
The recommended 180 kW project will have a design flow of 21 cubic feet per second, which is
conveyed from a diversion and intake structure at river mile 1.42 down to a hydro powerhouse
near river mile 0.50 via a 32‐inch diameter, 4,400‐foot long high‐density polyethylene (HDPE)
penstock. Total gross head is 161 feet, and net operating head at full flow is 151 feet. The
hydro powerhouse will connect to the utility’s existing electric distribution system via a 3,100‐
foot‐long buried power cable. The project includes 4,400 feet of new roads. The
recommended project layout is shown on Figure ES‐1.
Table ES‐1 Technical Summary of Recommended 180‐kW Project
PROJECT FEATURE VALUE
Project Design Flow 21 cubic feet per second
Normal Headwater Elevation 228 feet
Normal Tailwater Elevation 67 feet
Gross Project Head 161 feet
Penstock 4,400 feet of 32‐inch HDPE
Net Project Head at Full Flow 151 feet
Turbine Type Single Crossflow Turbine
Installed Generating Capacity 180 kilowatts
Plant Capacity Factor 72%
Primary Power Lines 3,400 feet
Communications Lines 9,700 feet
Access Trails 4,400 feet
Total annual utility load met by hydro plant (kilowatt‐hours, kwh) 591,000 kWh (83%)
Total annual utility load met by diesel plant 119,000 kWh (17%)
Total Utility Load at Generation 710,000 kWh
Excess hydro output available for dispatchable services 390,000 kWh
Excess hydro output dispatched to interruptible loads 332,000 kWh
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report ii
In an average year, the recommended project is estimated to supply 83% of False Pass’ annual
electric demand, reducing electric utility fuel consumption by 47,300 gallons annually. At an
estimated fuel cost of $3.08 per gallon in 2026, the project would reduce utility fuel expenses
by $145,800 in its first year of operation. The recommended project can also displace an
estimated 8,600 gallons annually of heating fuel used to heat community buildings through the
installation of dispatchable energy services.
The project has an estimated installed cost of $5.08 million in 2022 dollars. This includes
estimated costs from final design and permitting through construction and commissioning with
a 25% contingency. Economic analysis of the project indicates it has a benefit‐cost ratio of 1.15
compared to continued reliance on the diesel power plant. This analysis includes utilization of
excess hydro energy to provide interruptible heating systems for community buildings on a
dispatchable basis.
This feasibility study included multi‐year hydrology and fisheries studies to characterize the
Unga Man Creek resource. Project performance estimates are based on 3.5 years of site‐
specific hydrology with a 31‐year record extension using a correlation (R2 = 0.68) to Russell
Creek, located 40 miles to the northeast in Cold Bay, Alaska.
LSD conducted fisheries surveys in 2015, 2016, and 2017 to characterize the presence,
abundance, and location of fish species and habitat in Unga Man Creek. Fisheries survey scope
and methodology were coordinated with habitat staff at the Alaska Department of Fish and
Game (ADFG) and survey findings were shared with ADFG habitat staff in fall 2017. The
recommended project layout incorporates all preliminary recommendations provided by ADFG
habitat staff based on review of draft layouts and fisheries survey findings.
Based on the findings in this study, continued development of this project is warranted. Under
reasonable permitting and financing schedules, project construction could commence in 2025.
The following actions are recommended to advance this project.
(1) Continue collecting hydrology data through the permitting process to improve resource
characterization and project performance estimates.
(2) Identify and quantify prospective interruptible loads within the community. Committed
loads at the processing plants may justify a larger installed capacity improving overall
project economics.
(3) Initiate the permitting process for the project. Key permitting activities include land use
negotiations, determining whether the project is under the jurisdiction of the Federal
Energy Regulatory Commission, and continuing dialog with the ADFG regarding fish
habitat permit conditions. Outstanding resource questions should be identified so
additional field studies can be initiated.
(4) Advance designs for the project.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report iii
Figure ES‐1 Recommended Hydro Project Layout
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report iv
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City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report v
REPORT PURPOSE, LIMITATIONS, AND COPYRIGHT NOTICE
Purpose of this Report
A feasibility study is the second stage of screening for a potential hydroelectric project, and
represents a comprehensive review of relevant factors that pertain to the technical, economic,
environmental, and political viability of developing a hydroelectric project at a given site or for
a given power need. Depending on the available budget and the quality of existing information,
the feasibility study may include field data collection for key information necessary to complete
a technical, economic, and environmental review of the proposed project.
This feasibility study provides the City of False Pass (City) an in‐depth assessment of the overall
feasibility of a hydroelectric project at Unga Man Creek, and provides information on the
advantages and disadvantages associated with various project sites and configurations. This
information is intended for use by the City to decide whether to proceed with project
development.
Limitations
In conducting our analysis and forming the opinions and recommendations summarized in this
report, Polarconsult has relied on information provided by others, and has assumed this
information is complete and correct. Also, Polarconsult has made certain assumptions with
regard to future events, conditions, and circumstances. Polarconsult does not guarantee the
accuracy of the information, data, or opinions contained herein. The methodologies employed
to perform the analysis and arrive at the conclusions in this report follow generally accepted
industry practice for this level of study. We believe that the assumptions and methodologies
used are reasonable and appropriate for meeting the objectives of this study. Future events
and information may result in outcomes materially different from those projected in this study.
Such events and information include, but are not limited to, future energy demand, supply, and
cost in False Pass; actual site conditions such as ownership, topography, hydrology, and
geology; future trends in local construction, material, and labor costs; and national, state, or
local policies that may affect aspects of the project.
The contents and findings of this report are limited to potential development of a hydroelectric
project at Unga Man Creek by the City, and are suitable only for this intended purpose. Any use
of this report and the information contained therein constitutes agreement that (1)
Polarconsult makes no warranty, express or implied, relating to this report and its contents, (2)
the user accepts sole risk of any such use, and (3) the user waives any claim for damages of any
kind against Polarconsult. The benefit of such waivers, releases, and limitations of liability
extend to Polarconsult, its subcontractors, owners, employees, and agents.
Copyright
This report is copyright‐protected by Polarconsult and may not be reproduced in whole or part
without the prior written consent of Polarconsult. The City has the right to reproduce and use
this report for purposes related to hydroelectric development of Unga Man Creek including,
without limitation, the right to deliver this report to regulatory and funding entities in support
of, or in response to, their inquiries and proceedings.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report vi
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City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report vii
TABLE OF CONTENTS
EXECUTIVE SUMMARY..............................................................................................................I
ACRONYMS AND TERMINOLOGY............................................................................................VI
1.0 INTRODUCTION............................................................................................................1
1.1 PROJECT AUTHORIZATION AND PURPOSE ....................................................................................1
1.2 PROJECT EVALUATION PROCESS .................................................................................................1
1.3 CURRENT AND PREVIOUS LOCAL HYDROPOWER STUDIES ...............................................................2
2.0 COMMUNITY PROFILE..................................................................................................4
2.1 COMMUNITY OVERVIEW...........................................................................................................4
2.2 EXISTING ENERGY SYSTEM ........................................................................................................4
3.0 RECOMMENDED PROJECT.......................................................................................... 11
3.1 DESCRIPTION OF PROJECT FEATURES ........................................................................................13
3.2 RESOURCE DESCRIPTION .........................................................................................................17
4.0 ECONOMIC ANALYSIS................................................................................................. 20
4.1 COST ESTIMATE FOR RECOMMENDED PROJECT ..........................................................................20
4.2 ECONOMIC EVALUATION OF RECOMMENDED PROJECT ................................................................20
4.3 SENSITIVITY ANALYSIS ............................................................................................................22
5.0 CONCLUSIONS AND RECOMMENDATIONS................................................................. 24
6.0 REFERENCES ............................................................................................................ 26
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report viii
APPENDICES
APPENDIX A – PROJECT MAPS
APPENDIX B – SITE PHOTOGRAPHS
APPENDIX C – HYDROLOGY REPORT
APPENDIX D – RESOURCE DATA AND ANALYSIS
D.1 Maximum Probable Flood Estimate
D.2 Flood Hazard Considerations
D.3 Creek Basin Characteristics and Geomorphology
D.4 Geotechnical Considerations
APPENDIX E – ENVIRONMENTAL CONSIDERATIONS
E.1 Early Agency Consultations
E.1.1 U.S. Fish and Wildlife Service IPaC Results
E.1.2 Alaska Department of Fish and Game Consultations
E.2 Wildlife
E.3 Fisheries
E.4 Water and Air Quality
E.5 Wetland and Protected Areas
E.6 Archaeological and Historical Resources
E.7 Land Development Considerations
E.8 Telecommunications and Aviation Considerations
E.9 Visual and Aesthetic Resources
E.10 Mitigation Measures
APPENDIX F – PERMITTING INFORMATION
F.1 Federal Permits
F.2 State of Alaska Permits
F.3 Local Permits
F.4 Other Permits and Authorizations
APPENDIX G – COST ESTIMATES AND ECONOMIC ANALYSIS
G.1 Project Cost Estimate
G.2 Economic Analysis and Assumptions
APPENDIX H – TECHNICAL ANALYSIS
H.1 Hydro Project Analysis
H.2 Hydro Project Modeling
APPENDIX I – DRAFT REPORT REVIEW COMMENTS AND RESPONSES
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report ix
LIST OF FIGURES
Figure ES‐1 Recommended Hydro Project Layout.....................................................................iii
Figure 1‐1 Feasibility Evaluation Process Flowchart................................................................ 2
Figure 2‐1 Recent Annual Electric Utility Energy Generation.................................................. 6
Figure 2‐2 Recent Electric Utility and Electricity Costs..........................................................10
Figure 3‐1 Typical Hydro Project Performance and Utilization, Recommended
Project (2001 Hydrology)......................................................................................11
Figure 3‐2 Flow Duration Curves at Proposed Diversion Site................................................18
Figure 5‐1 Proposed Project Development Schedule............................................................25
Figure A‐1 Project Overview and Location Map ...................................................................A‐2
Figure A‐2 Map of Recommended Unga Man Creek Hydro Project.....................................A‐3
Figure A‐3 Plan Detail of Diversion Site for Recommended Project.....................................A‐4
Figure A‐4 Plan Detail of Powerhouse Site for Recommended Project................................A‐5
Figure D‐1 Geologic Map Detail of the Project Area.............................................................D‐6
Figure E‐1 Estimated Unga Man Creek Flow at RM 1.4 (Below Diversion Site) ...................E‐4
Figure F‐1 FAA Obstruction Evaluation / Airports Airspace Analysis Tool Results...............F‐3
Figure H‐1 Annual Performance Of Recommended Hydro Project (1981 to 1985,
1996 to 2021).......................................................................................................H‐6
LIST OF TABLES
Table ES‐1 Technical Summary of Recommended 180‐kW Project.......................................... i
Table 2‐1 Existing Utility Generation Equipment ................................................................... 5
Table 2‐2 Recent Electric System Statistics ............................................................................ 7
Table 2‐3 Historic Population Data......................................................................................... 8
Table 2‐4 Partial False Pass Large Building Inventory............................................................. 9
Table 3‐1 Technical Summary of Recommended Project.....................................................12
Table 4‐1 Base Case Assumptions Used for Economic Analysis...........................................21
Table 4‐2 Summary of Economic Data for Recommended Project......................................21
Table 4‐3 Sensitivity Analysis Results (Grant‐Financed Project) ..........................................22
Table D‐1 Unga Man Creek Sub‐Basin Areas........................................................................D‐3
Table G‐1 Cost Estimate for Recommended Project............................................................G‐2
Table G‐2 Economic Analysis of Recommended Project .....................................................G‐3
Table H‐1 Intra‐Day Diesel Generator Dispatch Assumptions.............................................H‐4
Table H‐2 Expected Range of Annual Performance for Recommended Project .................H‐5
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report x
LIST OF PHOTOGRAPHS
Photograph B‐1 Oblique Aerial View of Unga Man Creek Looking South ...............................B‐2
Photograph B‐2 View towards Unga Man Valley from False Pass Fish Processing Plants.......B‐3
Photograph B‐3 Unga Man Creek at River Mile 0.45...............................................................B‐3
Photograph B‐4 Unga Man Creek at River Mile 0.55...............................................................B‐4
Photograph B‐5 Unga Man Creek at River Mile 0.75...............................................................B‐4
Photograph B‐6 Unga Man Creek at River Mile 0.95...............................................................B‐5
Photograph B‐7 Unga Man Creek at River Mile 1.35...............................................................B‐5
Photograph B‐8 North & South Fork Unga Man Creek Confluence at River Mile 1.6.............B‐6
Photograph B‐9 South Fork Unga Man Creek at River Mile 1.75.............................................B‐6
Photograph B‐10 South Fork Unga Man Creek at River Mile 1.80.............................................B‐7
Photograph B‐11 South Fork Unga Man Creek at River Mile 1.85.............................................B‐7
Photograph B‐12 North Fork Unga Man Creek at River Mile 1.65 ............................................B‐8
Photograph B‐13 Oblique View of North Fork Unga Man Creek Basin......................................B‐8
Photograph B‐14 Tributary Waterfall on North Fork Unga Man Creek above River Mile 2.1...B‐9
Photograph B‐15 North Fork Unga Man Creek above River Mile 2.1........................................B‐9
Photograph B‐16 North Fork Unga Man Creek above River Mile 2.1......................................B‐10
Photograph B‐17 Tributary Waterfall on North Fork Unga Man Creek above River Mile 2.1.B‐10
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report vi
ACRONYMS AND TERMINOLOGY
F degrees Fahrenheit
ADCCED Alaska Department of Commerce, Community, and Economic Development
ADEC Alaska Department of Environmental Conservation
ADFG Alaska Department of Fish and Game
ADNR Alaska Department of Natural Resources
ADOT&PF Alaska Department of Transportation and Public Facilities
AEA Alaska Energy Authority
APICDA Aleutians Pribilof Islands Community Development Association
AVO Alaska Volcano Observatory
AWG American Wire Gauge
BCR benefit‐cost ratio
cfs cubic feet per second
coanda effect
The tendency of a moving fluid to stay attached to a smoothly convex solid
obstruction. A common example is the way a stream of water, as from a faucet,
will wrap around a cylindrical object held under the faucet (such as the barrel of
a drinking glass).
dispatchable energy, service
See interruptible energy, interruptible service.
DCRA Division of Community and Regional Affairs (organized under ADCCED).
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report vii
DMA Duane Miller & Associates, Inc.
DR dimension ratio, or design ratio. Designator for the wall thickness of HDPE pipe.
DTM digital terrain model
CPCN Certificate of Public Convenience and Necessity
City City of False Pass, Alaska
discharge A synonym for stream flow. Flow and discharge are used interchangeably herein.
EA environmental attributes. The term “environmental attributes” is used by the
utility industry to describe the desirable aspects of electricity that are generated
from environmentally benign and/or renewable sources. Environmental
attributes are tracked, marketed, bought, and sold separately from the physical
energy. Separating the environmental attributes from the physical energy allows
customers or ratepayers to elect to buy sustainable or “green” energy even if it is
physically unavailable from their electric utility.
excess power, energy, electricity
Electricity generated by the hydro project in excess of the utility’s current load.
Excess energy can be directed to one or more dispatchable loads (such as electric
heat) and may or may not have economic value depending on when it is
available and how it is used. At times when there is no beneficial use for excess
energy, water flow into the turbine can be reduced so that little to no excess
energy is generated.
FAA Federal Aviation Administration
FERC Federal Energy Regulatory Commission
ft foot, feet
GDM generation dispatch model. A model used to evaluate the performance and
output of proposed electric generation configurations (diesel and hydro).
HDPE high‐density polyethylene
in. inch, inches
interruptible power, energy, electricity, load, demand
Electricity that is generated by the hydro generator(s) in excess of system
demand (see excess power) and dispatched to customers on a special
interruptible basis. Utility generation and dispatch of interruptible electricity
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report viii
starts and stops without notice based on water availability and other criteria.
Interruptible energy is also called “dispatchable energy” in some documents.
interruptible electric heating service (dispatchable service)
A special metered electric service that provides energy for space heating, water
heating, or similar purposes. Electricity is made available to the service only
when there is excess hydro (or other low‐cost) electricity generation capacity
available. The service is automatically turned off by the utility at times when
utility demand is high enough to require operation of more expensive
generators. Because the service is interruptible without notice, it is only suitable
for certain uses, and any important uses will require a backup system. Space
heating and water heating are common uses because a building’s existing
systems can serve as backup at modest or no cost. The interruptible system can
take many forms, and can be integrated with a building’s existing mechanical
systems (an electric boiler installed before an oil‐fired boiler, for example), or as
an independent supplemental system (an electric baseboard heater installed in a
building with an existing Toyo stove, for example).
ISER Institute of Social and Economic Research (University of Alaska Anchorage)
ISFR in‐stream flow reservation. A minimum amount of flow that must be left in a
river or stream during all or certain times of the year.
kV kilovolt, or 1,000 volts
kVA kilovolt‐ampere
kW kilowatt, or 1,000 watts. One kW is the power consumed by ten 100‐watt
incandescent light bulbs.
kWh kilowatt‐hour. The quantity of energy equal to one kilowatt (kW) expended for
one hour.
LSD Living Systems Design, LLC
mi mile, miles
NREL National Renewable Energy Laboratory
NTS Northern Technical Services
O&M operations and maintenance
OMR&R operating, maintenance, repair, and replacement
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report ix
PCE Power Cost Equalization (program)
Polarconsult Polarconsult Alaska, Inc.
Q500 A flood event with a 0.2 percent (1 in 500) chance of occurring in any given year.
river‐left, river‐right
Sides of a waterway looking in the direction of water flow.
RM river mile
RPS renewable portfolio standard. A mandate for an electric utility or other defined
region to source a certain amount of energy generated from renewable sources.
space heating Heating of buildings. May also include water heating for domestic use,
depending on the specific context and application.
USACE U.S. Army Corps of Engineers
USFWS U.S. Fish and Wildlife Service
USGS U.S. Geological Survey
V volt
YCE YourCleanEnergy, LLC
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 1
1.0 INTRODUCTION
1.1 PROJECT AUTHORIZATION AND PURPOSE
In 2016 and 2017, the Aleutians Pribilof Island Community Development Association (APICDA)
hired Living Systems Design, LLC (LSD) and Polarconsult Alaska, Inc. (Polarconsult) to perform
feasibility‐level studies of a hydroelectric project on Unga Man Creek near the City of False
Pass, Alaska (City). Progress reports documenting these efforts were issued annually. In 2019,
the City assumed the APICDA study and expanded Polarconsult’s scope to include additional
hydrology, analysis, and reporting. This report presents study findings from 2016 through 2021,
and makes recommendations for further action based upon the study findings.
1.2 PROJECT EVALUATION PROCESS
Hydroelectric development options for Unga Man Creek were evaluated using an iterative
process to arrive at the recommended project. Initially, resource data for Unga Man Creek
were collected and analyzed along with the community’s electric demand profile to identify
several initial project configurations for further evaluation. The resource data included stream
hydrology, site topography, and related information. Environmental and regulatory factors
were also considered in developing project configurations. Data from the electric utility were
collected and analyzed to develop a model of the community’s electric demand profile. These
data were input to a generation dispatch model (GDM) to determine how much of the utility’s
demand each project configuration could supply and how much excess energy generation
would be available for use on a dispatchable basis.
The performance of each project alternative was analyzed with economic data comprised of
fuel costs, construction costs, operations and maintenance (O&M) costs, and financing options
to develop an estimated benefit‐cost ratio (BCR). The recommended project supplies the
highest percentage of current and projected future electrical demand (considering both utility
demand and dispatchable energy services) while maintaining an acceptable BCR and satisfying
expected environmental constraints. This evaluation process is represented graphically on
Figure 1‐1.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 2
GENERATION DISPATCH MODEL
Utility load served by diesel and hydro.
Excess energy generation potential.
ELECTRIC UTILITY DATA
PCE & utility reports, utility load profile,
existing utility system
PROJECT RESOURCES
Hydrology, site topography
(storage), fisheries data,
other permit data
LOAD PROFILE
Prime power demand
Potential interruptible energy loads
POTENTIAL HEATING LOADS
Building inventory
Climate data
ECONOMIC EVALUATION
Project goals met? Benefit/cost ratio?ECONOMIC DATA
Diesel fuel cost
Excess energy value
Financing plan
RECOMMENDED PROJECT
PROJECT COSTS
Design and permitting costs, project
design approach, construction cost,
operation and maintenance costs
SURVEYS
Topography,hydrography, land ownership,
etc.
GEOTECHNICAL ASSESSMENTS
Stream diversion sites, civil infrastructure,
project alignments
COMMUNITY REVIEW AND DECISION
RESULTPROJECT EVALUATIONDATA ANALYSISSOURCE DATA
ITERATIONS TO
IMPROVE PROJECT
PROPOSED PROJECT CONFIGURATION
HYDROLOGY
Flood magnitude, flow duration, timing
and frequency
ENVIRONMENTAL & REGULATORY
CONSTRAINTS
Aquatic resources, aesthetics, special
restrictions
Figure 1‐1 Feasibility Evaluation Process Flowchart
1.3 CURRENT AND PREVIOUS LOCAL HYDROPOWER STUDIES
1.3.1 1980 Regional Reconnaissance Study
In 1980, the U.S. Army Corps of Engineers (USACE) performed a regional study of potential
hydroelectric resources in the Aleutians. As part of this study, the USACE looked at two
potential run‐of‐river projects in the area of False Pass, one at Mike’s Creek, northwest of the
City, and one on a tributary just west of the City. Both of these resources are located wholly or
partially within the wilderness limits of the Alaska Maritime National Wildlife Refuge.1
1.3.2 1982 Reconnaissance Study
In 1982 Northern Technical Services and Van Gulik & Associates conducted further
reconnaissance on both USACE sites and concluded they were economically unattractive.2
1 USACE 1980. Summary condensed from YCE 2010.
2 NTS 1982. Summary condensed from YCE 2010.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 3
1.3.3 2010 Regional Energy Reconnaissance Study
In 2010, YourCleanEnergy, LLC (YCE) conducted a renewable energy resource assessment for
Cold Bay, False Pass, and Nelson Lagoon. In False Pass, the assessment recommended
expansion of the existing waste heat system at the diesel power plant, installation of two 10
kilowatt (kW) tilt‐up wind turbines, and further study of hydropower potential at Waterfall
Creek and Unga Man Creek. The study only included review of existing information, and
recommended hydrologic studies at both creeks to characterize their resource potential.3
1.3.4 2015 Hydro Reconnaissance Study
In 2015, APICDA hired LSD to perform a reconnaissance study of local hydropower resources for
False Pass. LSD analyzed two local streams, Waterfall Creek south of the community and Unga
Man Creek to the north of the community. The study concluded that an approximately 125 kW
run‐of‐river hydro project on Unga Man Creek appeared viable and warranted further study.
This study estimated the project could supply approximately 86% of the electric utility’s
electricity demand at generation. The study included initial fisheries surveys of both creeks and
installation of stream gauging stations on Unga Man Creek to begin collection of site‐specific
hydrology data. Polarconsult contributed technical and cost guidance on the hydro project.4
1.3.5 Current Feasibility Study
In 2016 and 2017, Polarconsult and LSD were hired by APICDA to conduct feasibility‐level
studies at Unga Man Creek to characterize its hydropower potential and feasibility. The City
assumed the study in 2019 and added scope for additional hydrology, analysis, and reporting.
Field studies were conducted from 2016 to 2021, and included:
● Fisheries surveys in August 2016 and August 2017 to characterize the extent and
productivity of fisheries resources at Unga Man Creek. Reports are in Appendix E.
● A hydrology study conducted from 2015 through 2021 to characterize Unga Man Creek
hydrology. Gauging stations were installed at the bridge and on the north and south
forks to characterize hydrology on these major tributaries. Report is in Appendix C.
● Aerial photogrammetric imagery collection and topographic mapping with limited
ground‐based reference elevation stations to characterize site topography.
● Wetlands mapping to support preliminary project layouts.
● Field reconnaissance to review site terrain and surficial geotechnical conditions.
3 YCE 2010 at pages 24 to 40.
4 LSD 2015, Polarconsult 2015a and 2015b.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 4
2.0 COMMUNITY PROFILE
2.1 COMMUNITY OVERVIEW
The City of False Pass is an incorporated 2nd class city located in the Aleutian Islands on the east
shore of Unimak Island along Isanotski Strait. It is located within Township 61 South, Range 94
West of the Seward Meridian. Its geographic coordinates are 54.85 north and 163.41 west.
The community and project site are both located within U.S. Geological Survey (USGS)
quadrangle map False Pass D‐5. The City is approximately 660 miles southwest of Anchorage,
140 miles northeast of Dutch Harbor, and 40 miles southwest of Cold Bay. The community can
be accessed by air or water and is served by the Alaska Marine Highway System. False Pass is
located in the Aleutian Islands Recording District and the Aleutians East Borough School District.
False Pass lies in the maritime climate zone. Typical temperatures range from 11 to 55F and
annual snowfall averages 56 inches with total annual precipitation of 33 inches. Fog is common
in the summer months and windy conditions prevail year‐round. The freezing index for False
Pass is about 500F‐days, and many freeze‐thaw cycles occur each winter.5
The current population of False Pass is approximately 397. Many residents have seasonal
employment in commercial fisheries or in the local tourism industry. Subsistence is an
important element in the local economy and culture. False Pass has a federally recognized
Alaska Native tribe, organized as the False Pass Tribal Council and which is a member of the
Aleutian Pribilof Islands Association (APIA).
Most of the houses in False Pass are fully plumbed and utilize a municipal water system and on‐
site septic systems. Water, electric, and solid waste utility services are provided by the City. 6
2.2 EXISTING ENERGY SYSTEM
2.2.1 Community Energy Overview
False Pass has an islanded electrical system with no transmission interconnections to other
communities. The community currently relies 100% on diesel‐fired generation for electricity.
Diesel and other petroleum fuels are delivered by barge several times annually.
2.2.2 Electric Utility Organization
Electric service in False Pass is provided by the City as authorized by Certificate of Public
Convenience and Necessity (CPCN) No. 442, which allows the City to operate a public utility for
5 Adapted from Golder 2014.
6 All information was complied from the ADCCED community profile for False Pass (DCRA 2022). The current
population estimate may include seasonal plant workers.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 5
providing electric services in and around False Pass. The CPCN was issued in 1993 by the Alaska
Public Utilities Commission, (predecessor agency to the Regulatory Commission of Alaska),
which has exempted the City from rate regulation pursuant to the public interest exception
included in Alaska Statute 42.05.711(b).7 The City utility participates in the state’s Power Cost
Equalization (PCE) program. This program provides limited electric rate subsidy to residential
and community facility customers served by eligible rural Alaska utilities.
2.2.3 Generation System
The False Pass diesel power plant has three diesel generators controlled by automatic
paralleling switchgear furnished by the Alaska Energy Authority (AEA) in 2004. The plant
generates at 480 volts (V) three‐phase, which is stepped up to 7,200 V for distribution with
three single‐phase 75 kilovolt‐amp (kVA) transformers. Installed generation equipment is listed
in Table 2‐1.
The diesel plant is fitted with a waste heat system that provides heat to the adjacent city shop
warehouse. There is also an abandoned waste heat loop to the school. Prior consultants have
speculated that the school waste heat loop never worked properly because the loop was too
long and the piping was not properly insulated, resulting in excessive heat loss to the
environment.8
Table 2‐1 Existing Utility Generation Equipment
No. Equipment Prime Power (kW) Commissioned Date
1 John Deere 6068 205 kW 2022 (scheduled)
2 John Deere 6081 175 kW NA
3 John Deere 6081 125 kW NA
NA: not available.
2.2.4 Electrical Distribution System
The City’s electric distribution system consists of a 7.2 /12.47 kilovolt (kV) grounded wye three‐
phase buried cable system. Cable in the older portions of town is single phase with #2
American Wire Gauge (AWG) copper conductor and unjacketed concentric neutral. Cabling in
the north portion of town, out to the Bering Pacific Seafoods / Trident and Silver Bay Fish Plants
and point of interconnect of a hydro project at Unga Man, is newer three phase cable with 1/0
AWG copper conductor and jacketed concentric neutral. The system topology is predominately
radial with limited loop feed.9
7 The certificate and exemption were granted in Regulatory commission of Alaska docket U‐89‐010, Order #2.
8 Information condensed from Hoblet 2022 and YCE 2010 at pages 24 to 40.
9 Information condensed from Hoblet 2022 and YCE 2010 at pages 24 to 40.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 6
2.2.5 Planned Upgrades and Maintenance
In 2022 the City is completing upgrades to the diesel plant cooling system to increase capacity
to accommodate the new 205 kW generator and to correct existing deficiencies in the radiator
controls. No other upgrades to the diesel power plant or distribution system and currently
planned. The City performs routine preventative maintenance on the diesel plant, including
engine overhauls on an annual basis, cycling through the gensets based on run‐time and need.10
2.2.6 Existing Load Profile
Total system electrical demand for fiscal years 2011 through 2021 is presented on Figure 2‐1
and in Table 2‐2. Demand has fluctuated from approximately 450,000 to 800,000 kWh annually
at generation over the past decade, with demand consistently in the 600,000 to 800,000 kWh
range for the past five years.
Figure 2‐1 Recent Annual Electric Utility Energy Generation
10 Hoblet 2022.
City of False Pass Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc. June 2022 – Final Report 7 Table 2‐2 Recent Electric System Statistics Parameter FY 2011 FY 2012 FY 2013 FY 2014 FY 2015 FY 2016 FY 2017 FY 2018 FY 2019 FY 2020 FY 2021 kWh Generated 448,615 532,127 706,037 778,559 672,095 595,541 668,914 641,989 722,482 814,598 697,777 kWh for Station Service (% of total generation) NA 43,0208.1% 42,6496.0% 59,1857.6% 38,722 5.8% 42,1487.1% 41,7646.2% 40,4666.3% 47,4736.6% 41,5295.1% 33,615 4.8% kWh Sold 400,242 397,985 579,453 664,273 561,752 475,136 535,928 531,601 602,447 642,990 598,543 System Losses (1 – (sold + station service)/generated) 1.87% 17.12% 11.89% 7.08% 10.66% 13.14% 13.64% 10.89% 10.04% 15.97% 9.40% Fuel Used (gallons) 43,211 46,896 53,153 54,061 54,443 51,172 56,300 48,613 59,204 68,340 47,617 Generation Efficiency (kWh/gallon) 10.38 11.35 13.28 14.40 12.34 11.64 11.88 13.21 12.20 11.92 14.65 Fuel Price (fiscal year average) $3.12 $3.44 $3.57 $4.03 $3.68 $3.13 $2.24 $3.57 $2.01 $1.71 $1.63 Total Fuel Expense $134,974 $161,190 $189,683 $217,801 $200,350 $160,066 $126,200 $173,407 $119,025 $116,942 $77,501 Total Non‐fuel Expense $29,423 $57,296 $38,222 $82,720 $25,474 $15,635 $53,354 $69,161 $171,521 $187,837 $126,768 Total Utility Expense $164,397 $218,486 $227,905 $300,521 $225,824 $175,701 $179,554 $242,568 $290,546 $304,779 $204,269 Electricity Cost per kWh $0.41 $0.55 $0.39 $0.45 $0.40 $0.37 $0.34 $0.46 $0.48 $0.47 $0.34 Utility Rate ($/kWh) $0.58 $0.42 $0.42 $0.42 $0.42 $0.44 $0.42 $0.43 $0.49 $0.62 $0.62 Residential Rate with PCE ($/kWh, annual average) $0.35 $0.18 $0.15 $0.14 $0.15 $0.23 $0.27 $0.31 $0.19 $0.33 NA NOTES: Fiscal year rums from July 1 of the preceding year to June 30 of the stated year. All data are compiled from monthly Power Cost Equalization Program records provided by the Alaska Energy Authority and/or utility reports provided by the City of False Pass. kWh kilowatt‐hour NA not available.
City of False Pass
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June 2022 – Final Report 8
2.2.7 Projected Future Load Profile
Community electrical demand is a function of population, electricity cost, available income, and
other factors. Commercial, industrial, and transient loads can also be major factors in total
electrical demand.
There are three fish processing plants in False Pass: the shuttered Peter Pan plant, the Trident
Seafoods Plant, and the Silver Bay Plant. The Trident and Silver Bay plants both self‐generate
during the processing seasons, but all three plants receive off‐season housekeeping or year‐
round peripheral power from the City utility.
2.2.8 Load Growth
For project evaluation purposes, the future utility load at generation is assumed to be 710,000
kWh annually. This value is the average for the past five fiscal years (2017 to 2021). This load is
assumed to be flat over the 50‐year planning life of the project. Sensitivity analysis described in
Section 4.3 of this report is used to evaluate project performance under load growth and
reduction scenarios.
2.2.9 Population
The population of False Pass has fluctuated from approximately 40 to 80 over the past century
and is presented in Table 2‐3. There is a significant influx of several hundred seasonal workers
during the summer months to staff the processing plants.
Future population in False Pass is assumed to stay within the historic range and is expected to
be influenced by future demographic trends and local economic opportunities.
Table 2‐3 Historic Population Data
Year Population 1
1930 59
1940 88
1950 42
1960 41
1970 62
1980 70
1990 68
2000 64
2010 35
2020 397 2
Future Projection 40 to 400 2
(1) Population data is from DCRA 2022.
(2) 2020 population may include seasonal workers.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 9
2.2.10 Public Buildings
The City’s large building inventory is a potential market for excess energy from the hydro
project by adding dispatchable electric heating services to these buildings to offset fuel used by
their existing heating systems. Large public / commercial buildings in False Pass are summarized
in Table 2‐4.
While building‐specific analysis of potential dispatchable energy services is beyond the scope of
the current study, a generalized analysis was performed to characterize the potential for and
benefit of dispatchable energy services utilizing excess hydro output. Assumptions are
discussed in Appendix H.
Table 2‐4 Partial False Pass Large Building Inventory
Large Building Approximate
Square Footage
False Pass School 10,939 square feet
Trident Processing Plant Complex (bunkhouse, main plant building, warehouses, etc.) 24,000 square feet
Silver Bay Processing Plant Complex (bunkhouse, main plant building, warehouses, etc.) 95,800 square feet
Library / Post Office 2,432 square feet
City Office / Recreation Center 2,432 square feet
Public Safety / Clinic Building 4,716 square feet
City Shop / Diesel Plant 6,120 square feet
Isanotski Grocery Store / Liquor Store 3,200 square feet
Total of Above Buildings 149,639 square feet
Data condensed from AEA 2016. Estimates designated by ‘ ~ ’ derived from aerial imagery.
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Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 10
2.2.11 Energy Market
Energy from a local hydroelectric project will be fed into the City electric system to offset the
need for diesel‐fired electricity generation. In addition, the hydroelectric project will often
generate energy in excess of electrical demand. It is recommended that this excess energy be
made available on a dispatchable basis to offset other local energy consumption for space and
water heating.
Recent fuel, non‐fuel and total electricity costs in False Pass are presented on Figure 2‐2.
Figure 2‐2 Recent Electric Utility and Electricity Costs
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 11
3.0 RECOMMENDED PROJECT
The recommended project is a run‐of‐river hydroelectric project on Unga Man Creek with an
intake at RM 1.42 and a powerhouse at RM 0.50. The recommended project has a 4,400‐foot‐
long, 32‐inch‐diameter buried high‐density polyethylene (HDPE) penstock, developing total
gross head of 161 feet and net head at full flow of 151 feet. The recommended design flow is
21 cfs for an installed generating capacity of 180 kW. Technical details of the recommended
project are listed in Table 3‐1. The concepts for major components are described in Section 3.1.
In an average year, the recommended project will supply 83 percent of the utility’s annual
energy demand at generation and allow the diesel power plant to be turned off 75 percent of
the time. Daily performance for a typical year (2001) is shown in Figure 3‐1. Dispatchable
excess energy from the project can displace an estimated 8,600 gallons of annual heating fuel
demand in community buildings. Performance extremes over the 31‐year hydrology record
range from supplying 66 percent of demand (1996) to supplying 99 percent of demand (2019).
All conceptual design elements are subject to refinement as permit conditions become known,
additional site information is collected, and project designs are advanced.
Figure 3‐1 Typical Hydro Project Performance and Utilization, Recommended Project
(2001 Hydrology)
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Table 3‐1 Technical Summary of Recommended Project
PROJECT FEATURES VALUE
Access Trails 4,400 feet
Primary Power Lines 3,100 feet
Communications Lines 9,700 feet
Basin Area Above Diversion Site (square miles) 2.76 square miles
Mean Annual Flow (cfs) 24 cfs
Minimum Flow (cfs) ~3 cfs (average annual minimum flow)
~0 cfs (extreme minimum flow)
Plant Design Flow (cfs) 21 cfs
Assumed In‐Stream Flow Reservation (ISFR) 0 cfs
Intake Headwater Elevation (ft) 228 feet
Powerhouse Finished Floor Elevation (ft) 75 feet
Normal Tailwater Elevation (ft) 67 feet
Gross Head (ft) 161 feet
Pipeline Length (ft)/Diameter (in) 4,400 feet of 32‐inch HDPE
Net Head at Full Flow (ft) 151 feet
Type of Turbine Single Crossflow Turbine (1)
Minimum Power Generation (kW) ~15 kW (1)
Installed Capacity (kW) 180 kW
Plant Capacity Factor (2) 73%
Diversion Structure Height (ft) ~ 19 feet
Available Storage Volume none
ESTIMATED TYPICAL ANNUAL PERFORMANCE OF RECOMMENDED HYDRO PROJECT (3)
Total Existing Annual False Pass Load 710,000 kWh
False Pass Utility Demand Supplied by Diesel 119,000 kWh (16.8%)
False Pass Utility Demand Supplied by Hydro 591,000 kWh (83.2%)
Total Annual Hydro Energy Generation 1,144,000 kWh
Hydro Output used to Supply Existing False Pass Load 591,000 kWh
Hydro Output used for Hydro Station Service and Frequency Control (diesels‐off) 164,000 kWh
Gross Excess Energy Available from Hydro (4) 390,000 kWh
Gross Excess Hydro Energy Dispatched to
Community Buildings for Heating Applications 332,000 kWh
Gross Remaining Excess Energy Available from Hydro 58,000 kWh
NOTES:
(1) The turbine configuration considered in this study is a single crossflow turbine, which typically has a minimum operating
threshold of abut 10 to 25% of full design flow depending on vendor and design details.
(2) The amount of energy the project can produce with available water divided by the amount of energy the project could
produce operating at 100% output year‐round.
(3) Estimated annual performance is based on assumed utility load equivalent to 710,000 kWh with the existing system, and
average annual hydro plant performance over 31 years based on the extended hydrology record.
(4) “Gross excess energy” means this is the energy generated at the hydro powerhouse, before system losses are subtracted.
cfs cubic feet per second HDPE high‐density polyethylene kWh kilowatt‐hour
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Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 13
3.1 DESCRIPTION OF PROJECT FEATURES
The descriptions of project features in this section are conceptual and are based upon review of
current information about site conditions, construction costs, logistical considerations, long‐
term maintenance and operational considerations, and related factors. In many cases, there
are multiple valid construction methods or design decisions possible. In these cases, decisions
will be made in future phases of the project as additional information on environmental,
regulatory, and technical constraints becomes available.
3.1.1 Access
Access from the City to the hydro project site will be via the existing landfill road and vehicle
bridge across Unga Man Creek. The hydro powerhouse will be adjacent to the north side of the
road bridge, accessed via a new driveway off the east side of the road. The hydro diversion site
will be accessed via a new construction road extending west from the existing road up the Unga
Man Creek valley approximately 4,300 feet to the diversion site. There are no significant known
constraints regarding the final alignment of this road.
These access corridors are adequate for all project activities including construction, operations,
and maintenance. Heavy equipment use of the road bridge over Unga Man Creek should be
consistent with its rated traffic capacity and use the existing adjacent creek ford as appropriate.
3.1.2 Power Line
The existing 7.2/12.47 kV three phase underground distribution circuit that serves the Silver
Bay Fish Processing Plant would be extended approximately 3,100 feet to the new hydro
powerhouse location. The power extension would parallel the existing landfill access road and
cross in duct on the landfill access road bridge.
There will also be a secondary power distribution circuit running from the hydro powerhouse
up to the diversion structure to power equipment at the diversion. This will be an
approximately 4,400 foot long underground circuit installed along the diversion access road.
The primary distribution extension to the hydro powerhouse can be either underground or
overhead. The utility’s existing distribution system is entirely underground, and the terrain
along the power line route appears suitable for installation of an underground line.
Underground construction is assumed.
3.1.3 Controls and System Integration
The hydro project will have a new dedicated communications circuit running approximately
9,700 feet between the hydro and diesel powerhouses to coordinate operations and allow
remote monitoring and operation of the hydro project. This control circuit will be co‐located
with new and existing underground utilities. There will also be a dedicated approximately
4,400 foot long communications circuit installed in the access road corridor between the hydro
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 14
powerhouse and diversion. This circuit will provide the hydro controls information about the
intake status, including availability of water for power generation. It will also support remote
operation of gates and apparatus at the intake, as well as remote monitoring of the intake.
The switchgear at both powerhouses will be integrated to support automatic operation of both
plants. The existing diesel switchgear will be upgraded as needed with a new master controller
to coordinate dispatch of hydro and diesel generators and support automatic parallelling of all
units. Under normal operation, the hydro plant will carry the full system load and the diesel
engines will be turned off in standby mode. As system load approaches the available capacity
of the hydro, the switchgear will activate a diesel engine to parallel with the hydro. The diesel
engine will be set at a base load to maintain reasonable fuel efficiency and avoid wet‐stacking
or other adverse operating conditions.
Once this project is sanctioned by the City, review of the optimal generating capacity of the
diesel generators is warranted to optimize efficiency for both stand‐alone operation and
paralleling with the hydro plant. It may be cost‐effective to replace some generators with
smaller or larger units. This can be coordinated with planned diesel plant upgrades, overhauls,
and/or machine retirement schedules.
With this project, the utility’s diesel generators will be turned off about 3/4ths of the time.
This will extend the life of the diesels, reduce the frequency of diesel maintenance and
overhauls, reduce usage of consumables, and conserve fuel. The existing waste heat system
that serves the shop from the diesel powerhouse can be fitted with an interruptible electric
heating system to keep the standby diesel generator set(s) warm and to continue providing
heat to the shop.
Interruptible electric heating services can be implemented in a number of ways. This study
assumes that buildings are fitted with a second electric meter that includes a special relay
controlled by the hydro plant switchgear. The switchgear incrementally enables these
interruptible meters when the hydro has excess generating capacity until interruptible services
are using all of the available excess energy. This is a dynamic process, as total hydro generation
and utility load are constantly changing, and any given interruptible meter may or may not have
loads turned on when it is activated by the hydro plant switchgear. A load bank would also be
installed at the hydro powerhouse to allow the hydro controller to regulate system voltage and
frequency independently of interruptible services.
Communications between the hydro plant switchgear and interruptible meters can use several
different forms, such as internet, radio link, dedicated wire, power line carrier, or grid
frequency modulation.
City of False Pass
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June 2022 – Final Report 15
3.1.4 Diversion and Intake Structures
Diversion Structure
The project diversion site is at RM 1.42, just upstream of the mouth of the east fork tributary.
This site consists of typical alluvium (boulders to gravels) at the surface with no bedrock
exposures. No subsurface geotechnical investigations have been conducted. Foundation on
unconsolidated alluvial deposits or structurally similar material is assumed.
The diversion structure is conceptualized as a combination sheetpile, reinforced concrete, and
gravity earthen fill diversion structure as shown in Figure A‐3. The existing creek thalweg
elevation at the site is approximately 221 feet. The intake screen will be approximately 15 feet
wide by 230 foot sill elevation, with a 20 foot wide main spillway at 230.83 foot elevation and
50‐foot wide flood spillway at 233.0 foot elevation. All spillways will be uncontrolled. The
preliminary estimated design flood (Q500 estimate) of 2,000 cfs will result in a design flood
elevation of approximately 235.5 foot elevation behind the diversion structure. Earthen
wingwalls with a crest elevation of 240 feet will extend from the spillway portion of the
diversion approximately 200 feet to the north and 50 feet to the south to intersect with
adjacent natural terrain.
Main and flood spillway sections will be constructed of sheetpile cutoff walls with a concrete
apron on the downstream side and graded rip‐rap placed along the upstream and downstream
faces for energy dissipation and lateral support of the sheetpile wall.
Diversion wingwall dikes will be built from local bank‐run material. An impervious liner
material will be integrated into the upstream face of the wingwall dike to prevent piping
erosion during high water events. The upstream face and other areas exposed to flood waters
will be armored with graded rip rap to prevent erosion of the wingwalls.
Intake Structure
The intake is conceptualized to utilize a coanda‐type intake screen with an approximately 18‐
inch long by 15 foot wide flat plate screen set at 45 degrees. Wedge wire spacing will be set to
prevent admittance of fish and deleterious debris, tentatively at 0.1 inch. The coanda screen is
largely self cleaning, reducing intake maintenance requirements. The intake screen will be set
in a sheetpile and concrete structure that forms an intake gallery beneath the screen. This
gallery will provide a quiescent pool for fine‐grained sediment to settle out of the water
column, and will also provide water storage for plant regulation equivalent to approximately
five minutes of project flow.
The intake structure will receive raw water and debris from the diversion impoundment and
direct this flow over the coanda screen. This screen will filter rocks, gravel, and plant matter
out of the water, with filtered water collecting in the intake gallery beneath this screen.
Filtered debris will be flushed off the screen and back to Unga Man Creek by action of excess
water flowing over the screen. Filtered water will flow by gravity from the gallery into the
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 16
penstock and to the powerhouse. The normal headwater elevation in the intake gallery will be
approximately 228 feet.
Both the diversion structure and intake gallery will be fitted with gates to flush out accumulated
sediments and debris from the impoundment and intake gallery on an as‐needed basis.
3.1.5 Penstock
The penstock will be a 32‐inch‐diameter HDPE pipe buried along the project access road. The
overall penstock length will be 4,400 feet. At the full design flow of 21 cfs, head losses along
the penstock will be approximately 10 feet. The penstock can be DR26 HDPE pipe with a
nominal pressure rating of 80 psi.
The penstock will be fitted with an intake grate at the inlet inside the intake gallery to prevent
admittance of large debris and also with a butterfly isolation valve and air relief vent near the
intake. The conceptual penstock alignment does not require any air relief valves, drain valves,
or fabricated fittings. Power and communications will be buried along the same route as the
penstock to operate and control equipment on the intake and diversion structures.
3.1.6 Powerhouse
The powerhouse will be located near the river‐left bank at RM 0.50, just downstream of the
landfill road bridge, and will be an approximately 20‐ by 30‐foot building with 10‐foot ceilings
(see Figure A‐4). The building will include an overhead gantry beam to move the turbine and
generator. The powerhouse will house the turbine, generator, switchgear, and associated
control systems for the project. The turbine will be a single crossflow‐type turbine, and the
generator will be a three‐phase synchronous machine. Finished floor elevation in the
powerhouse will be 75 feet. The tailrace finished floor beneath the powerhouse will be 65 feet.
The normal tailwater elevation will be approximately 67 feet, resulting in a gross project head
of approximately 161 feet and a net operating head at full design flow of about 151 feet.
The hydroelectric generator will be a three‐phase 480‐V synchronous machine. It will normally
be the sole generation source for the utility but will also be capable of paralleling with the
diesel generators when needed. A pad‐mounted transformer will be located outside the hydro
powerhouse to step the voltage up to 7.2/12.47 kV for connection with the existing electric
system. A manual disconnect and fuse will be located at the hydro powerhouse, enabling the
hydro powerhouse to be isolated from the distribution system for maintenance and repair.
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June 2022 – Final Report 17
3.2 RESOURCE DESCRIPTION
The resource considered in this study is Unga Man Creek, located one mile north of False Pass
near the north entrance to Isanotski Strait (Figures A‐1 and A‐2 and Photograph B‐1).
3.2.1 Hydrology
Annual precipitation amounts vary significantly between the Pacific Ocean and Bering Sea sides
of Unimak Island, with annual precipitation of 80+ inches occurring on the Pacific side and less
than 40 inches on the Bering Sea side of the island, just 30 miles away.11 Due to this rapidly
changing climatic regime, significant variations exist in local precipitation patterns, due to the
influences of elevation, local alpine topography, basin orientation, specific storm tracks, and
similar orographic factors. Mean minimum January temperature across the island is +26F.12
No prior hydrology information is known to exist for Unga Man Creek or other nearby creeks.
The nearest creek with both current and long‐term hydrology data is Russell Creek, 40 miles to
the northeast in Cold Bay.
To characterize the hydrology resource for this project, stream gauging stations were
established on the main stem of Unga Man Creek in 2015 and at the north and south forks in
2016. The 3.5 years of hydrology data from these stations have been used to create an 31‐year
extended record of Unga Man hydrology through correlation (R2 = 0.68) with Russell Creek. A
detailed hydrology report is included with Appendix C of this report.
At the proposed diversion site, Unga Man Creek has average annual flow of 24 cubic feet per
second (cfs). Resource capacity factor for the recommended project, with no in‐stream flow
reservation, is 73 percent. Figure 3‐2 presents the flow duration curve for Unga Man Creek at
the proposed diversion site. Figure 3‐2 shows curves based on the actual hydrology data
collected at the south fork gauging station and based on the 31‐year extended hydrology
record. The recent period of record for the hydrology study experienced higher flows than the
longer period of record at Russell Creek. Hydrology based on the longer extended record is
used for project evaluation. More information is available in the Appendix C hydrology report.
Unga Man Creek exhibits evidence of active meander, significant bed load transport, and
significant flood events through the proposed project reach. Meander limits are generally well
defined by significant cut banks or topography throughout the proposed project reach. Creek
basin characteristics and geomorphology are discussed in Appendix D.3.
11 Interpreted from Plate 2, USGS 2003.
12 Interpreted from Plate 1, USGS 2003.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 18
Figure 3‐2 Flow Duration Curves at Proposed Diversion Site
Note 1: Zero flow from 90 to 100% of the time is an artifact of the record extension correlation to Russell Creek.
Scatter in the correlation data results in some non‐zero Russell Creek flows mapping to zero flow at Unga Man
Creek. See hydrology report in Appendix C for more information, including Figure 3‐11 (correlation data scatter
plot).
3.2.2 Topography
Topography (Figures A‐2, A‐3, and A‐4) of the project area was obtained by LSD in 2016 and
2017 using drone imagery and photogrammetric methods to generate a digital surface model.
Ground control points and vegetation canopy data were collected along the creek corridor to
calibrate the model and create an approximate digital terrain model (DTM). DTM
representation of bare earth topography is excellent along the barren creek corridor and other
areas void of vegetation, and fair to good in vegetated areas.
3.2.3 Geotechnical Observations
Unimak Island is of volcanic origin and has been subject to extensive glaciation.13 Surficial
geology within the footprint of the recommended hydro project consists of unconsolidated
alluvium and possibly volcanic deposits grading from boulders through cobbles and gravels
down to fine‐grained material (Photographs B‐3 through B‐10 and B‐12). Some creek cut banks
show well‐stratified deposits (Photographs B‐3, B‐7, and B‐12) that suggest the valley floor
topography may partly be the result of glaciofluvial and/or volcanic depositional processes.
No competent bedrock exposures were observed in the project footprint during field
reconnaissance for this project. Project structures can expect to be founded in local
unconsolidated material. More information on site geology and known geotechnical conditions
are provided in Appendix D at Section D.4.
13 USGS 1997.
Note 1.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 19
3.2.4 Fisheries Resources
Unga Man Creek is listed by the Alaska Department of Fish and Game (ADFG) as anadromous
fish habitat for chum, pink, coho and sockeye salmon.14 Field surveys in 2015, 2016, and 2017
by LSD for this project characterized and quantified the presence, abundance, and habitat of
anadromous fish in the creek. Studies indicate that the creek is important habitat for pink and
chum salmon, but not for sockeye or coho. 93 percent of all potential spawning habitat on
Unga Man Creek, including essentially all high‐value habitat, is located downstream of the road
bridge (RM 0.55) and project tailrace (RM 0.50), and will not be affected by project
operations.15 The creek is not considered to be significant for sport or commercial fisheries.
Polarconsult and LSD consulted with ADFG in design of field studies and project layouts. The
proposed project layout reflects preliminary ADFG guidance based on fisheries survey results
and hydrology data collected through 2017. Fisheries survey reports, ADFG conversation
records, and related information is included in Appendix E. Negotiating reasonable fish habitat
permit conditions appropriate for habitat protection will be important to realizing the full
benefits of this project.
14 Unga Man Creek is listed in the Atlas and Catalog of Waters Important to the Spawning, Rearing, and
Migration of Anadromous Fishes, maintained by the Alaska Department of Fish and Game.
15 LSD 2015, LSD 2016, LSD 2017.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 20
4.0 ECONOMIC ANALYSIS
To evaluate the economic benefits of the hydro project, a comparative analysis was performed
between a hydro project and future diesel generation costs without a hydro project. Based on
this analysis, the hydro project is a lower‐cost power supply option for False Pass than
continued purchase and consumption of diesel fuel, especially if the hydro project’s excess
energy is used for space heating on an interruptible basis. Fitting buildings for interruptible
electric heating services is recommended to be an integral part of the hydro project in order to
realize the full project benefits.
An economic analysis looking forward 50 years in time by necessity makes significant
assumptions. Section 4.3 includes a sensitivity analysis that explores the impacts of key
assumptions used for the economic analysis.
4.1 COST ESTIMATE FOR RECOMMENDED PROJECT
The total installed cost of the project is $5.08 million in 2022 dollars. This includes costs from
permitting and design through project construction and commissioning. A detailed cost
estimate is provided in Appendix G. This cost estimate assumes the community contracts with
a qualified construction firm to build the project.
4.2 ECONOMIC EVALUATION OF RECOMMENDED PROJECT
The economic analysis of the hydro project was performed on a relative basis, using continued
operation of the diesel power plant as the reference case. Estimates of major differential costs
were developed for the analysis, which included:
1) Annual costs for hydro project operation and maintenance,
2) Annual savings from reduced fuel usage, operations, and maintenance costs at the
diesel power plant,
3) Annual savings for reduced heating fuel usage thru dispatchable energy services, and
4) Capital costs of the hydro project.
All of these expense items were considered over the 50‐year life of the project, and then
converted to present value amounts. The present value of the project’s benefits and costs
(relative to continued use of the diesel power plant) were then compared to determine the
project’s estimated benefit‐cost ratio. The electric utility’s general and administrative costs are
assumed to be constant for both cases, and so were not considered. Similarly, the diesel power
plant will be needed for both cases, so expenditures for the diesel plant beyond O&M and fuel
savings are also not considered. Major assumptions used in the economic analysis of the
project are summarized in Table 4‐1. These assumptions are discussed in greater detail in
Appendix G.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 21
Table 4‐1 Base Case Assumptions Used for Economic Analysis
Utility Assumptions Value
Annual Electric Demand 710,000 kilowatt‐hours (1)
Diesel Power Plant Fuel Efficiency 12.5 kWh generated per gallon (1)
Annual Utility Fuel Usage for Electricity Generation 56,800 gallons (1)
Per Gallon Fuel Cost to Utility $3.06 per gallon (2)
Total Annual Utility Fuel Costs $173,800
Utility Load Growth Projections Flat at current load level
(4)
Economic Model Assumptions
Hydro Project Salvage Value (Year 50) $0
(4)
Construction and Commissioning Year 2026 (4)
Project Financing Debt financing, Grant financing (5)
Debt term 30 years (4)
Debt interest rate 5% (6)
Real discount rate 3% (4)
(1) Approximate annual average for the utility from 2016 to 2021, as determined from PCE program and utility records.
(2) 2022 fuel cost as estimated by the Alaska Energy Authority (AEA 2021).
(4) Assumed value for analysis. See also Appendix G narrative.
(5) The economic analysis for grant‐financed project used the economic model developed for the AEA’s Renewable Energy
Grant Program (Round 14 version, released November 2021) (AEA, 2021).
(6) Assumed interest rate is based on the interest rate for the Power Project Fund administered by the Alaska Energy
Authority as of April 11, 2022.
Two financing alternatives were evaluated for the project’s capital costs: (1) debt financing and
(2) grant financing.16 Table 4‐2 summarizes the present‐value costs, present‐value savings, and
BCR for the recommended project for both debt‐ and grant‐based financing. Table 4‐2
assumes that 85% of the gross available excess hydro energy is directed to dispatchable energy
services to reduce heating fuel demand in community buildings.
Table 4‐2 Summary of Economic Data for Recommended Project
Parameter Value
ECONOMIC EVALUATION OF DEBT‐FINANCED PROJECT (Relative to continued diesel generation)
Present Value Of Project Benefits $5,617,000
Present Value Of Project Costs $6,121,000
BENEFIT‐COST RATIO (DEBT‐FINANCED PROJECT) 0.92
ECONOMIC EVALUATION OF GRANT‐FINANCED PROJECT (Relative to continued diesel generation)
Present Value Of Project Benefits $5,675,000
Present Value Of Project Costs $4,932,000
BENEFIT‐COST RATIO (GRANT‐FINANCED PROJECT) 1.15
Please see Appendix G for assumptions used in the economic analysis.
16 The grant‐financed scenario is developed using the economic model used by AEA to evaluate applications to
the Renewable Energy Grant Program (AEA 2021).
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 22
4.3 SENSITIVITY ANALYSIS
A sensitivity analysis was performed to determine how sensitive the economic analysis
conclusions are to variations in assumptions and input parameters. The assumptions and
inputs reviewed and the results are summarized in Table 4‐3 for a grant‐financed project. For
each variable, the input range considered, resulting range of BCR, and value that results in a
BCR of 1.00 are presented. Generally, the BCR of a debt‐financed project is lower than for a
grant‐financed project for a given set of conditions due to interest owed on the capital debt.
Table 4‐3 Sensitivity Analysis Results (Grant‐Financed Project)
Parameter Base Case Value
(BCR of 1.15)
Range
Considered
Range of
Resulting BCR
Value for BCR of
1.00
Installed Cost (1) $5,080,000
6.35 to 3.81 million
(+/‐ 25%) 0.90 – 1.57 $5,750,000
(+13%)
System load and
Growth trend (2)
710,000 kWh
(No growth)
350,000 to 1,065,000 kWh
(+/‐ 50%) 0.77 – 1.41 –25%
In‐Stream Flow
Reservation (ISFR) None 10 to 0 cfs 0.95 – 1.15 7 cfs
Incremental Annual
Operations Costs $25,300/year +200% to ‐50% 1.03 – 1.21
+235%
($60,000/year)
Cost of Fuel (3) $3.08 per gallon
(2026) ‐50% to +200% 0.70 – 2.05
–17%
($2.57 in 2026)
Percent Utilization
of Excess Energy 85% 0% to 100% 1.01 – 1.17 NA
Environmental
Attributes Sales
Price
$0.00 per kWh $0.00 to $0.03 per kWh 1.15 – 1.23 NA
NOTES:
(1) The feasibility‐level project cost estimate already includes a 25% contingency.
(2) Load growth cases assume a constant load over the project’s economic life at the stated percentage of existing annual load.
(3) Range of fuel costs is applied to both power plant fuel and heating fuel. Since the AEA fuel price projections were published
in November 2021, crude oil prices have increased ~25% from ~$80 to ~$100 per barrel.
BCR benefit‐cost ratio
cfs cubic feet per second
NA Not applicable because variations in the parameter cannot result in a BCR of 1 or less.
Based on this analysis, the project economics are most sensitive to the following parameters:
(1) Cost of fuel,
(2) In‐stream flow reservations (ISFRs), and
(3) Installed cost.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 23
Cost of Fuel
The project’s benefits are sensitive to the price of fuel. The City has very little control over the
long term price of fuel. History shows fuel prices are volatile and will vary from $10 to 150 per
barrel of crude based on current geopolitical and global industry events. This volatility is
compounded in rural Alaska due to limited delivery and logistic options, which magnifies the
price volatility inherent in global crude oil markets.
In‐Stream Flow Reservations (ISFRs)
ISFRs essentially deprive the hydro project of ‘fuel’, impairing its ability to produce energy.
ISFRs will prolong project down time during low flow periods, and will at times curtail
generation when the project is able to operate. This will increase the run‐time for diesel
generators, reducing O&M cost savings from the project as well as reducing fuel savings.
Where possible, permitting should explore alternatives to ISFRs such as alternate plant
configurations or off‐site compensatory habitat in lieu of ISFRs.
Installed Cost
Construction cost overruns on small hydroelectric projects can significantly reduce the project’s
benefits. Proper project design and construction management are both key to a successful on‐
budget project. An adaptive design that can quickly address changing field conditions using on‐
site materials, equipment, and labor will help to control construction costs. In addition,
selecting a contractor with both local experience and small hydro experience will help avoid
problems during construction. Using force‐account construction with a capable superintendent
instead of a contractor for all or parts of the project can also be a good strategy to help the
control construction costs.
Additionally, the challenging logistics and high transportation costs of remote Alaska projects
mean that significant attention should be paid to early planning for the project. Last‐minute
shipping of minor materials due to incomplete material take‐offs, extended lease terms of
imported construction equipment due to poor planning or unforeseen site conditions, and
similar factors can rapidly increase project costs.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 24
5.0 CONCLUSIONS AND RECOMMENDATIONS
The run‐of‐river hydroelectric project on Unga Man Creek recommended in this report will
supply 83% of False Pass’ existing electrical demand in an average water year. Additionally, it
will displace 8,600 gallons annually of heating fuel used to heat community buildings.
At an estimated installed cost of $5.08 million, the recommended project has an estimated BCR
of 1.15 compared to continued reliance on diesel fuel for electricity generation. This includes
the significant space heating benefits the project is capable of supplying to the community.
These findings are based on no ISFR being necessary to maintain fish habitat in the project
bypass reach. This is based on preliminary discussions with ADFG habitat personnel. An ISFR
will significantly reduce project benefits, and close attention to this matter is warranted during
the permit negotiation process. As appropriate, permit negotiations with the ADFG should
explore compensatory anadromous habitat as mitigation for reduced flows in the bypass reach
in lieu of ISFRs.
Based on the findings of this study, continued development of the project is warranted as the
project can provide a significant long‐term benefit to False Pass. The next major steps to
develop the project are:
(1) Initiate the permitting process for the project.
(a) Prepare and file a Declaration of Intention with the Federal Energy Regulatory
Commission (FERC) to determine if the project falls under FERC jurisdiction. This will
influence the course of permitting for the project and will also effect the project’s
life‐cycle costs, with FERC jurisdiction being adverse to the City on both criteria.
Preliminary analysis suggests the project does not fall under FERC jurisdiction.
(b) Continue consultations with ADFG regarding conditions associated with the fish
habitat permit. Opportunities for off‐site mitigation, and on‐site mitigation within
the project area, should be discussed with ADFG personnel to maximize project
benefits.
(c) Apply for other required permits and authorizations, including land authorization
from Isanotski Corporation, USACE wetlands permit, Alaska Department of Natural
Resources (ADNR) water rights permit, ADNR dam safety jurisdiction review, State
Fire Marshall life safety plan review, and local permits as required.
(2) Continue collecting hydrology data at Unga Man Creek to affirm project performance
findings and support permitting efforts. Continue / initiate other resource studies to
support permitting and design efforts.
(3) Complete design of the project, which will include the following:
(a) Finalize project capacity once permit conditions are known, additional site
information is available, and specific dispatchable energy loads are identified.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 25
(b) More detailed analysis of existing space heating demand in community buildings to
refine the quantity of excess hydro energy that can be dispatched to space heating
loads and the extent of upgrades needed to implement electric heating services.
(c) Review existing diesel plant controls to identify specific upgrades necessary to
integrate plants.
(d) Design of hydro project infrastructure for bid documents.
Table 5‐1 provides anticipated future project schedule and milestones. The assumed start date
for future project efforts is September 1, 2022, and for construction is summer 2025.
Figure 5‐1 Proposed Project Development Schedule
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 26
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June 2022 – Final Report 27
6.0 REFERENCES
AEA 2016. Alaska Energy Authority (AEA). Remote Alaska Communities Energy
Efficiency (RACEE) Competition. Phase II Summary and Strategic Energy
Efficiency Plan. False Pass. August 22, 2016. Anchorage, AK.
AEA 2021. AEA. Renewable Energy Fund Round 14. Economic Evaluation Model
(xlsx file). November 2021. Anchorage, AK.
AVO 2017. Alaska Volcano Observatory. Website accessed September 20, 2017.
https://www.avo.alaska.edu/volcanoes/
DCRA 2022. Alaska Department of Commerce, Community, and Economic
Development, Division of Community and Regional Affairs (DCRA). Web
site: http://www.commerce.state.ak.us for False Pass, accessed February
2022.
DMA 2004. Duane Miller & Associates. Geotechnical Exploration, Proposed Solid
Waste Landfill, False Pass Alaska. DM&A Job No. 4086.047. March 30,
2004. Anchorage, AK.
Golder 2014. Golder Associates, Inc. Geotechnical Reconnaissance for Wind Turbine
Feasibility, Final. False Pass, Alaska. Project/Deliverable 123‐95824.01.
June 2, 2014. Anchorage, AK.
HDR 2007. HDR, Inc. False Pass Landfill Access Road, Hydrology and Hydraulic Study,
Final Draft. May 2007. Anchorage, AK.
Hoblet 2022. Hoblet, Nikki. Mayor, False Pass. Personal communication also with
Public Works Director participating. January 2022. False Pass, AK.
LSD 2015. Living Systems Design, LLC (LSD). False Pass Hydroelectric Potential 2015
Reconnaissance Report (included Polarconsult 2015a and 2015b as
attachments). September 9, 2015. Gustavus, AK.
LSD 2016. LSD and Polarconsult. False Pass Hydroelectric Potential at Unga Man
Creek. 2016 Feasibility Study Progress Report. December 2016.
Gustavus, AK and Anchorage, AK.
LSD 2017. LSD. False Pass Field Report for August 22‐23, 2017. Describes fisheries
surveys and findings, drone mapping results. August 2017. Gustavus, AK.
NREL 2004. National Renewable Energy Laboratory. The Alaska Village Electric Load
Calculator. NREL/TP‐500‐35824. September 2004. Golden, CO.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report 28
NTS 1982. Northern Technical Services & Van Gulik and Associates. Reconnaissance
Study of Energy Requirements and Alternatives for the villages of Aniak,
Atka, Chefornak, Chignik Lake, Cold Bay, False Pass, Hooper Bay, Ivanof
Bay, Kotlik, Lower and Upper Kalskag, Mekoryuk, Newtok, Nightmute,
Nikolski, St. George, St. Mary’s, St. Paul, Toksook Bay, and Tununak. July
1982. Anchorage, AK.
Polarconsult 2015a. Polarconsult Alaska, Inc. (Polarconsult). Preliminary Hydrology Estimate
for Hydropower Development at Unga Man and Waterfall Creeks near
False Pass, Alaska. September 2015. Anchorage, AK.
Polarconsult 2015b. Polarconsult. Preliminary Project Performance and Development Cost
Estimates for Unga Man Creek Hydro near False Pass, Alaska. September
2015. Anchorage, AK.
Polarconsult 2021. Polarconsult. Hydrology Report for Unga Man Creek near False Pass,
Alaska. December 2021. Anchorage, AK.
USACE 1980. U.S. Army Corps of Engineers, Alaska District (USACE). Regional Inventory
and Reconnaissance Study for Small Hydropower Projects. Aleutian
Islands, Alaska Peninsula, Kodiak Island, Alaska. Volume II: Community
Hydropower Reports. October 1980. Anchorage, AK.
YCE 2010. YourCleanEnergy, LLC (YCE). Renewable Energy Resource Assessment for
the Communities of Cold Bay, False Pass, and Nelson Lagoon. May 2010.
Anchorage, AK.
USFWS 2022. U.S. Fish and Wildlife Service (USFWS). Information Planning and
Consultation (IPaC) Web Portal. Species list generated pursuant to
project code 2022‐0034126. April 2022. Anchorage, AK.
USGS 1997. U.S. Geological Survey (USGS). Revised Geologic Map of the Cold Bay and
False Pass Quadrangles, Alaska Peninsula. Open File Report 97‐0866.
1997.
USGS 2003. USGS. Estimating the Magnitude and Frequency of Peak Streamflows for
Ungaged Sites on Streams in Alaska and Conterminous Basins in Canada:
Water‐Resources Investigations Report 2003‐4188. By Curran, Janet H.;
Meyer, David F.; and Tasker, Gary D.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
APPENDIX A – PROJECT MAPS
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report A ‐ 1
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Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report A ‐ 2
Figure A‐1 Project Overview and Location Map
l
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report A ‐ 3
Figure A‐2 Map of Recommended Unga Man Creek Hydro Project
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report A ‐ 4
Figure A‐3 Plan Detail of Diversion Site for Recommended Project
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report A ‐ 5
Figure A‐4 Plan Detail of Powerhouse Site for Recommended Project
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
APPENDIX B – SITE PHOTOGRAPHS
Photograph Title Page Nos.
Photograph B‐1 Oblique Aerial View of Unga Man Creek Looking South ...............................B‐2
Photograph B‐2 View towards Unga Man Valley from False Pass Fish Processing Plants.......B‐3
Photograph B‐3 Unga Man Creek at River Mile 0.45...............................................................B‐3
Photograph B‐4 Unga Man Creek at River Mile 0.55...............................................................B‐4
Photograph B‐5 Unga Man Creek at River Mile 0.75...............................................................B‐4
Photograph B‐6 Unga Man Creek at River Mile 0.95...............................................................B‐5
Photograph B‐7 Unga Man Creek at River Mile 1.35...............................................................B‐5
Photograph B‐8 North & South Fork Unga Man Creek Confluence at River Mile 1.6.............B‐6
Photograph B‐9 South Fork Unga Man Creek at River Mile 1.75.............................................B‐6
Photograph B‐10 South Fork Unga Man Creek at River Mile 1.80.............................................B‐7
Photograph B‐11 South Fork Unga Man Creek at River Mile 1.85.............................................B‐7
Photograph B‐12 North Fork Unga Man Creek at River Mile 1.65 ............................................B‐8
Photograph B‐13 Oblique View of North Fork Unga Man Creek Basin......................................B‐8
Photograph B‐14 Tributary Waterfall on North Fork Unga Man Creek above River Mile 2.1...B‐9
Photograph B‐15 North Fork Unga Man Creek above River Mile 2.1........................................B‐9
Photograph B‐16 North Fork Unga Man Creek above River Mile 2.1......................................B‐10
Photograph B‐17 Tributary Waterfall on North Fork Unga Man Creek above River Mile 2.1.B‐10
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report B ‐ 1
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City of False Pass Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc. June 2022 – Final Report B ‐ 2 Photograph B‐1 Oblique Aerial View of Unga Man Creek Looking South Oblique aerial view looking south over main stem of Unga Man Creek from tidewater up to river mile 1.8. The approximate locations of proposed project features are shown. Living Systems Design, August 2015. River mile 1.6: South / North Fork ConfluenceLandfill River mile 1.4: East Fork MouthSouth Fork BasinEast Fork Basin Isanotski StraitRiver mile 1.42Hydro diversion siteRiver mile 0.55 Hydro powerhouse site Fish processing plants. Start project electric extension. False Pass Community (behind ridge) Mainland Alaska UNIMAK ISLAND
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report B ‐ 3
Photograph B‐2 View towards Unga Man Valley from False Pass Fish Processing Plants
Photograph B‐3 Unga Man Creek at River Mile 0.45
Landfill access road looking north‐northwest
from near the fish processing plants. Electric and
communication extensions would follow this
route to the hydro powerhouse site.
Polarconsult, August 2016.
Typical river‐left cut bank and flood plain / creek
bed morphology for reach downstream of road
bridge. River mile 0.45.
Polarconsult, August 2017.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report B ‐ 4
Photograph B‐4 Unga Man Creek at River Mile 0.55
Photograph B‐5 Unga Man Creek at River Mile 0.75
Typical main stem Unga Man Creek morphology just
below road bridge, looking downstream. Bridge
gauging station visible in foreground. Proposed tailrace
discharge location is in this vicinity. River mile 0.55.
Polarconsult, August 2017.
Typical main stem Unga Man Creek morphology
in reach above road bridge, looking upstream.
River mile 0.75.
Polarconsult, August 2016.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report B ‐ 5
Photograph B‐6 Unga Man Creek at River Mile 0.95
Photograph B‐7 Unga Man Creek at River Mile 1.35
Typical main stem Unga Man Creek morphology
in reach above road bridge, looking downstream.
Note broad cobble bar and river‐left cut bank.
River mile 0.95.
Polarconsult, August 2016.
River‐right cut bank near river mile 1.35.
Polarconsult, August 2016.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report B ‐ 6
Photograph B‐8 North & South Fork Unga Man Creek Confluence at River Mile 1.6
Photograph B‐9 South Fork Unga Man Creek at River Mile 1.75
Confluence of north and south forks, looking
upstream. Typical creek bed morphology for this
reach. River mile 1.6.
Polarconsult, August 2017.
Typical creek substrate on south fork Unga Man
above the gauging station. River mile 1.75.
Polarconsult, August 2016.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report B ‐ 7
Photograph B‐10 South Fork Unga Man Creek at River Mile 1.80
Photograph B‐11 South Fork Unga Man Creek at River Mile 1.85
Exposed consolidated stratum forming south
fork creek bed. Foreground boulders are
perched on consolidated stratum. River mile 1.8.
Polarconsult, August 2017.
Consolidated conglomerate stratum
outcropping at south fork river‐right bank.
River mile 1.85.
Polarconsult, August 2017.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report B ‐ 8
Photograph B‐12 North Fork Unga Man Creek at River Mile 1.65
Photograph B‐13 Oblique View of North Fork Unga Man Creek Basin
North fork gauging station and typical
creek bed substrate, looking upstream.
River mile 1.65.
Polarconsult, August 2016.
Oblique view of North fork Unga Man Creek
basin looking northwest. A prominent rock
outcropping on the north fork of Unga Man
Creek is visible in the middleground above
river mile 2.1.
Polarconsult, August 2016.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report B ‐ 9
Photograph B‐14 Tributary Waterfall on North Fork Unga Man Creek above River Mile 2.1
Photograph B‐15 North Fork Unga Man Creek above River Mile 2.1
Prominent rock outcrops in north fork
tributary headwaters above river mile 2.1.
Living Systems Design, August 2017.
Waterfall over a prominent rock
outcropping on a north fork
tributary above river mile 2.1.
Living Systems Design, August 2017.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report B ‐ 10
Photograph B‐16 North Fork Unga Man Creek above River Mile 2.1
Photograph B‐17 Tributary Waterfall on North Fork Unga Man Creek above River Mile 2.1
Steep stream gradient and typical
substrate along north fork tributary
headwaters above river mile 2.1.
Living Systems Design, August 2017.
Prominent rock outcrops and waterfall in
north fork tributary headwaters above
river mile 2.1.
Living Systems Design, August 2017.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
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City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
APPENDIX C – HYDROLOGY REPORT
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report C ‐ 1
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polarconsult alaska, inc.
1503 West 33rd Avenue, Suite 310
Anchorage, Alaska 99503-3638
Phone: (907) 258-2420
FAX: (907) 258-2419
L ETTER R EPORT
211231-FALSEPASSHYDROLOGYMEMO.DOC
DATE: December 31, 2021
TO: Nikki Hoblet, Mayor, City of False Pass
FROM: Joel Groves, P.E.
SUBJECT: Hydrology Report for Unga Man Creek near False Pass, Alaska
CC: Project File
1.0 INTRODUCTION AND SUMMARY OF FINDINGS
Unga Man Creek is under consideration by the City of False Pass (City) for hydropower
development to provide electricity to the community of False Pass. In 2015, Bob Christenen
with Living Systems Design completed a reconnaissance stody of local hydropower resources
for False Pass, which included installation of a stream gauge on Unga Man Creek at the road
bridge. Polarconsult was contracted in 2016, 2017, and 2020 to conduct feasibility‐level
investigations of the Unga Man Creek hydropower resource, including an expanded hydrology
study to gauge flows on the south and north forks of Unga Man Creek and analysis to evaluate
develop a long‐term hydrology model to support hydropower feasibility assessment.
This letter report summarizes Unga Man Creek hydrology as regards hydropower potential
based on field studies and analysis from 2015 to current. Specifically, this document:
1. Summarizes the gauging station installations, available data, and interim hydrology
analysis of Unga Man Creek based on data collected to date.
2. Summarizes hydrological record extensions using a correlation to the long‐term USGS
gauging station at Russell Creek in Cold Bay, AK.
3. Summarizes estimated flood frequency and magnitudes, and apparent flood events on
Unga Man Creek.
4. Supercedes prior hydrology reports for this site. All relevant information has been
carried forward into this document and updated with current analysis as appropriate.
Analysis indicates a clear correlation between south fork Unga Man Creek and Russell Creek in
Cold Bay. A model developed to predict south fork Unga Man Creek based on Russell Creek
flow achieves a coefficient of determination (R2) of 0.68 for the available approximately 3.5
years of common record.1 The south fork model is used to develop an extended hydrology
record for the south fork based on 31 full water‐years of hydrology data at Russell Creek.
Existing hydrology data are sufficient to form conclusions regarding feasibility of various hydro
projects in the Unga Man Creek basin. If the community decides to continue project
development, it is recommended that gauging continue in order to better guide the
development process. Future hydrology study design should be guided by specific resource
questions that will need to be addressed to secure project permits and approvals.
1 Coefficient of determination (R
2) is a mathematical measure of how closely two data sets match. A value of
zero indicates there is no relationship between the two data sets, and a value of one indicates the two data sets
are completely correlated. In general terms, for Alaska hydrology regression analyses, values above 0.70 are
considered good and values below 0.40 are considered poor. Similar models could be developed for the bridge
and north fork stations.
CITY OF FALSE PASS, ALASKA
HYDROLOGY REPORT FOR UNGA MAN CREEK NEAR FALSE PASS, AK POLARCONSULT ALASKA, INC.
DECEMBER 2021 PAGE 2 OF 27
2.0 AVAILABLE HYDROLOGY DATA
There are no known hydrology data for Unga Man Creek prior to the outset of this study in
August 2015.2 Four gauging stations were installed at Unga Man Creek for this study:
1. A station at the road bridge,
2. A station approximately ¼‐mile upstream of the bridge,
3. A station on the north fork, and
4. A station on the south fork.
The bridge site was heavily damaged by a flood event June 28, 2019 and was removed from
service. The station just upstream of the bridge was removed from service in 2016 and did not
yield useful data. The north and south fork stations were still in working order on March 10,
2021. Gauging station locations and records are summarized in Figure 2‐1, Figure 2‐2, and
Table 2‐1. The installations are described in detail in Section 5.0.
Approximately 2.8 years of hydrology data have been collected at the bridge gauging station,
2.5 years at the north fork gauging station, and 3.5 years at the south fork gauging station.
Flow measurements on Unga Man Creek are summarized in Table 2‐2. Hydrographs, stage‐
discharge rating curves, and flow duration curves for all active gauging stations are presented in
this memo. A record extension, hydrology model, and statistics are also presented.
Figure 2‐1: Hydrology Period of Record for Unga Man Creek Gauging Stations
2 A hydrology and hydraulic study report was completed for design of the landfill access road bridge. This study
developed flood magnitude estimates but did not include any stream gauging at Unga Man Creek (HDR 2007).
CITY OF FALSE PASS, ALASKA
HYDROLOGY REPORT FOR UNGA MAN CREEK NEAR FALSE PASS, AK POLARCONSULT ALASKA, INC.
DECEMBER 2021 PAGE 3 OF 27
Table 2‐1: Summary of Hydrology Data for Unga Man Creek
Location (1)
Basin Size
(square
miles) (1)
Site
Elevation
(ft) (2)
Latitude(2)Longitude(2)Record
Begin Date
Record
End
Date
Number
of Daily
Records
Bridge Gauging
Station (RM 0.61) 3.66 70 54 52.4’ 163 25.0’
8/26/2015 7/18/2017 1,002
(2.75 yrs)
71% (4)
8/22/2017 3/23/2018
4/5/2019 7/8/2019
(3)
Upper Gauging
Station (RM 0.75) 3.59 81 54 52.4’ 163 25.2’ 8/27/2015 8/16/2016 NA
(5)
North Fork
Gauging Station
(RM 1.65)
1.38 277 54 52.3’ 163 26.3’
8/16/2016 7/12/2017
919 (6)
(2.52 yrs)
55% (4)
8/22/2017 3/23/2018
9/9/2018 9/17/2019
3/10/2021 Note 6.
South Fork
Gauging Station
(RM 1.65)
1.20 279 54 52.3’ 163 26.3’
8/17/2016 3/15/2017
1,278 (6)
(3.51 yrs)
77% (4)
8/23/2017 9/11/2018
11/21/2018 10/5/2020
3/10/2021 Note 6.
Russell Creek near
Cold Bay (USGS
#15297610)
30.9 7.65 55 10.7’ 162 41.3’
10/1/1981 12/31/1986 11,323 (7)
(31.0 yrs) 10/1/1995 9/30/2021
(7)
Abbreviations and Notes
ft: feet USGS: U.S. Geological Survey
NA: not applicable yrs: years
RM: river mile. Distance in miles along the main channel upstream from tidewater.
(1) Unga Man Creek river mileage is for the main channel meander mapped from field data collected the week of August 15th,
2016. Basin areas are calculated from project elevation model and main channel meander.
(2) Gauging station locations and elevations are approximate, and based on the project elevation model.
(3) Station was destroyed by a flood in June 2019 and is no longer in service.
(4) Percentage indicates percentage of the overall station record for which the station produced hydrology data.
(5) Station did not yield useful hydrology data. See station narrative in Section 5.0 of this report.
(6) For gauging stations still in service, “End Date” and “Number of Daily Records” both represent records through the most
recent download on March 10, 2021. Gauging station was still in working order at time of most recent download.
(7) Russell Creek record end date and record count reflect available data through the end of the most recent water year. The
station remains in service.
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Figure 2‐1: Unga Man Creek Basin and Gauging Stations
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Table 2‐2: Summary of Unga Man Creek Flow Measurements
Measurement
Location Date / Time 1 Party Measured
Flow (cfs) 2
Stage
Reading (ft)
Bridge Station 8/25/2015 1835h NR 7.8 ND
Bridge Station 8/26/2015 1212h NR 6.2 +0.60 (OSS)
3
Bridge Station 8/27/2015 1545h NR 6.5 +0.58 (OSS)
Bridge Station 1/18/2016 1600h NR 16.6 +0.98 (OSS)
3
Bridge Station 3/9/2016 1550h NR 19.6 +0.69 (OSS)
3
Bridge Station 8/15/2016 1930h J. Groves, A. Drobnica 23.2 +1.02 (OSS)
Bridge Station 8/18/2016 1845h J. Groves, A. Drobnica 19.7 +0.93 (OSS)
Bridge Station 6/5/2017 1645h C. Stewart 27.9 +0.70 (OSS)
Bridge Station 7/12/2017 1715h C. Stewart 16.1 +0.24 (OSS)
3
Bridge Station 8/22/2017 1230h J. Groves, A. Drobnica 11.2 +0.10 (OSS)3
Bridge Station 3/23/2018 1415h C. Stewart 41.8 +0.51 (OSS)
Bridge Station 9/9/2018 2000h C. Stewart 8.9 +0.12 (OSS)
Bridge Station 4/10/2019 1435h C. Stewart 24.2 +0.27 (OSS)
Upper Station 8/27/2016 1410h NR 8.7 ND
Upper Station 3/9/2016 1550h NR 13.6 +0.80 (OSS)
North Fork Station 8/16/2016 1545h C. Stewart, J. Groves 7.6 +0.42 (OSS)
North Fork Station 6/5/2017 1445h C. Stewart 8.4 ‐0.30 (OSS)
3
North Fork Station 7/12/2017 1615h C. Stewart 2.1 ‐0.81 (OSS)
3
North Fork Station 8/22/2017 1500h J. Groves, C. Stewart 2.2 ‐0.88 (OSS)
North Fork Station 3/23/2018 1240h C. Stewart 10.8 ‐0.63 (OSS)
3
North Fork Station 9/9/2018 1745h C. Stewart 2.6 ‐0.90 (OSS)
4
North Fork Station 4/9/2019 1515h C. Stewart 5.8 ‐0.65 (OSS)
3
North Fork Station 7/11/2019 1505h C. Stewart 2.7 +0.25 (OSS)
3
North Fork Station 3/10/2021 1435h C. Stewart 8.6 ‐0.30 (OSS)
South Fork Station 8/16/2016 1715h B. Christensen, J. Groves 11.1 ND
South Fork Station 6/5/2017 1530h C. Stewart 19.6 ‐0.16 (RP2)
South Fork Station 7/12/2017 1730h C. Stewart 9.5 ‐0.64 (RP2)
South Fork Station 8/22/2017 1830h J. Groves, A. Drobnica 6.5 ‐0.97 (RP2)
South Fork Station 3/23/2018 1325h C. Stewart 12.3 ‐0.83 (RP2)
4
South Fork Station 9/9/2018 1800h C. Stewart 3.7 ‐1.09 (RP2)
South Fork Station 4/9/2019 1555h C. Stewart 11.4 ‐0.81 (RP2)
South Fork Station 7/11/2019 1545h C. Stewart 7.8 ‐0.89 (RP2)
3
South Fork Station 3/10/2021 1630h C. Stewart 15.7 ‐0.75 (RP2)
Abbreviations and notes:
cfs: cubic feet per second NR: Not recorded.
ND: No datum set at time of measurement. OSS: Outside staff datum.
PZF: Point of zero flow. Lowest elevation of the creek bed along the outlet control feature at the gauging site.
Represents the approximate water stage at which no water would be flowing in the creek.
RP2: Reference Point #2 = 0 feet datum.
1. All times are local (Alaska Standard) time.
2. All flow measurements taken using the velocity‐area method (USGS 2010). Water velocity measurements taken with a
Global Water FP111 current velocity meter.
3. Manual OSS reading not recorded or used. Value is the logged water surface elevation in OSS/RP2 datum.
4. Manual stage elevation estimated from site photographs.
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3.0 UNGA MAN CREEK HYDROLOGY DATA AND ANALYSIS
Available hydrology data and analysis for the three gauging stations are discussed in the
following sections. Tabular daily data are presented in Attachment 1 to this report.
3.1 Unga Man Creek Hydrology Data – Bridge Gauging Station
Figure 3‐1 presents the available stage and temperature record at the bridge gauging station.
Raw logged stage (Outside Staff (OSS) datum3, magenta line) has been adjusted to point of zero
flow (PZF) datum4 (heavy black line) based on review of the stage record and site
measurements. Water temperature (blue line) and air temperature (red line) are also shown.
Figure 3‐1: Stage Record at Unga Man Creek Bridge Gauging Station
Figure 3‐2 presents the rating curve for the bridge gauging station. This curve has been
updated from prior reports to reflect additional data collected at the site, and is considered
reliable from approximately 3 to 80 cfs, which is 50% to 200% of measured flows. The curve is
reported in the PZF datum, consistent with the black line in Figure 3‐1.
Figure 3‐3 presents the hydrograph for the bridge site.
3 The outside staff datum is the physical staff board installed at the site.
4 The point of zero flow datum is the water stage at which there would be no flow in the creek. This is generally
the deepest point of the creek at a given location. The point of zero flow datum typically changes over time
relative to other datums as the creek bed changes.
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Figure 3‐2: Stage‐Discharge Rating Curve for Unga Man Creek Bridge Gauging Station
Figure 3‐3: Hydrograph for Unga Man Creek Bridge Gauging Station
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3.2 Unga Man Creek Hydrology Data – South Fork Gauging Station
Figure 3‐4 presents the available stage and temperature record at the south fork gauging station.
Available data are analyzed to develop a rating curve for the site (Figure 3‐5) and estimated
rating curve shifts due to scour events. The resulting hydrograph is presented as Figure 3‐6.
The hydrograph in Figure 3‐6 is consistent with all currently available site information, but due
to the apparent number and frequency of stream bed scour events, there is some uncertainty
in the accuracy of the resultant hydrograph. The hydrograph is considered reliable from
approximately 3 to 40 cfs, which is 50% to 200% of measured flows.
Figure 3‐4: Stage Record at Unga Man Creek South Fork Gauging Station
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Figure 3‐5: Stage‐Discharge Rating Curve for Unga Man Creek South Fork Gauging Station
Figure 3‐6: Hydrograph for Unga Man Creek South Fork Gauging Station
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3.3 Unga Man Creek Hydrology Data – North Fork Gauging Station
Figure 3‐7 presents the available stage and temperature record at the north fork gauging station.
Available data are analyzed to develop a rating curve for the site (Figure 3‐8) and estimated
rating curve shifts due to scour events. The resulting hydrograph is presented as Figure 3‐9.
The hydrograph in Figure 3‐9 is consistent with all currently available site information, but due
to the significant faction of estimated readings and apparent stream bed changes, there is some
uncertainty in the accuracy of the resultant hydrograph. The hydrograph is considered reliable
from approximately 1 to 20 cfs, which is 50% to 200% of measured flows.
Figure 3‐7: Stage Record at Unga Man Creek North Fork Gauging Station
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Figure 3‐8: Stage‐Discharge Rating Curve for Unga Man Creek North Fork Gauging Station
Figure 3‐9: Hydrograph for Unga Man Creek North Fork Gauging Station
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3.4 Unga Man Creek Record Extension (South Fork Station)
Generally, a minimum of 5 to 10 years of site‐specific hydrology data is needed to make well‐
informed decisions for hydroelectric development. However, if a nearby stream or river has a
gauging station with a long‐term record, and that record correlates well with the available
record at the subject stream, the longer record can be used to extend the shorter record
through a regression analysis. This provides higher‐confidence estimates of long‐term hydro
project performance than is possible by only considering the south fork record.
The only known stream suitable for regression analysis for Unga Man Creek is Russell Creek,
located approximately 40 miles to the northeast in Cold Bay. Hydrology data for Russell Creek
is summarized at the bottom of Table 2‐1. Record extension focused on the South Fork Unga
Man Creek gauging station because (1) it has the longest period of record for regression
analysis and (2) it appears to be the best hydropower resource in the Unga Man basin.
Hydrographs for the common period of record at South Fork Unga Man Creek and Russell Creek
are shown on Figure 3‐10. Flow at both creeks has been normalized by their respective basin
areas to aid in visual comparison of the hydrographs.
Figure 3‐10: South Fork Unga Man and Russell Creek Hydrographs for Common Period of Record
There is a moderate simple linear correlation (R2 = 0.47) for the full period of common record
between these two creeks. Review of the hydrograph (Figure 3‐10) indicates distinct seasonal
trends in the relationship between south fork Unga Man and Russell Creeks that repeats in the
4.6 years of common record. Regression analysis is performed by season, and a composite
hydrology model for Unga Man Creek is developed using seasonal models with a correlation of
R2 = 0.68. The resultant seasonal and overall hydrology models are presented in Table 3‐1.
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Table 3‐1: Hydrologic Record Extension for South Fork Unga Man Creek Using Seasonal
Regression Analysis with Russell Creek
Period of Record Analyzed Model 1,2
FULL PERIOD OF COMMON RECORD
(1,281 days of data, 8/17/2016 to 10/5/2020)
Qus = 0.022 x Qr + 5.27
(for reference, not used in study)
Winter (344 days in common record)
(January 1 to March 31)
Qr < 155: Quss = 0.051 x Qr – 5
Qr > 155: Quss = 5.7 x ln(Qr – 130) – 16.0
Spring (228 days in common record)
(April 1 to June 15)
Qr < 155: Quss = 0.145 x Qr – 15
Qr > 155: Quss = 6.2 x ln(Qr – 130) – 12.5
Summer (385 days in common record)
(June 16 to September 30)
Qr < 155: Quss = 0.087 x Qr – 10
Qr > 155: Quss = 5.4 x ln(Qr – 130) – 14.5
Fall (324 days in common record)
(October 1 to December 31)
Qr < 155: Quss = 0.087 x Qr – 10
Qr > 155: Quss = 5.5 x ln(Qr – 130) – 14.0
FINAL SOUTH FORK HYDROLOGY MODEL Qus = Quss
Qus: Final model flow at Unga Man Creek south fork gauging station in cubic feet per second.
Quss: Seasonal model flow at Unga Man Creek south fork gauging station in cubic feet per second.
Qr: Flow at Russell Creek USGS gauging station in cubic feet per second.
Note 1: Transitions between seasonal models are smoothed by linear ramping over a 15‐day period.
Note 2: A minimum model output of 0.2 cubic feet per second was established based on observed minimum flows
in south fork Unga Man Creek.
Figure 3‐11 presents concurrent data (blue dots) for actual south fork Unga Man Creek (bottom
axis) and hydrology model based on Russell Creek flow (side axis).
Figure 3‐11: Regression Analysis Results and Hydrology Model
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USE FOR PROJECT ANALYSIS
The extended record for south fork Unga Man Creek based on the Russell Creek gauge includes
31 water years from 1981 to 1986 and 1995 through 2021. Figure 3‐12 presents hydrology
statistics for south fork Unga Man Creek based on the extended record.
Figure 3‐12: Unga Man Creek Hydrology Statistics (Based on Extended Record)
Figure 3‐13 presents flow duration curves for south fork Unga Man Creek based on both the
actual period of record (light line) and the extended record (dark line). The extended record
line is universally lower than the actual record line, indicating that flows in the 2016 to 2020
period were slightly higher than over the longer 1981‐1986, 1995‐2021 period of record. Figure
3‐14 compares the extended record and south fork period of record at Russell Creek, and shows
this same trend, confirming that the south fork extended record model is properly adjusting the
actual site record to represent longer‐term hydrology conditions at Russell Creek.
Figure 3‐13: Unga Man Creek Flow Duration Curves
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3‐14 Russell Creek Flow Duration Curves
3.5 Unga Man Creek Subbasin Hydrology
The period of record at the north and south fork gauging stations is too short (2.5 and 3.5 years,
respectively) to form definitive conclusions about subbasin hydrology on these tributaries.
Available data does suggest that the north fork is ‘flashier’ than the south fork, experiencing
relatively higher peak flows and lower base flows than the south fork. It is unknown if this
effect, if real, indicates different basin hydrology or is an artifact of different hyporheic
conditions at the two gaging stations.
3.6 Hydrology Model for Hydro Project Analysis
The hydrology model developed for the Southfork gauging station is the basis for estimating the
performance of various hydro project options within the south fork Unga Man Creek basin.
Similar models could be developed based on the individual records at the bridge and north fork
stations, but the south fork gaging station has the longest period of record of the three stations
deployed for this study.
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4.0 FLOOD FREQUENCY AND MAGNITUDE ESTIMATES
The USGS has published algorithms to estimate flood frequency and magnitude for Alaska
streams.5 This allows development of credible estimates suitable for planning purposes at
locations lacking adequate site‐specific data.
6 Table 4‐1 summarizes estimated flood
frequencies and magnitudes calculated per USGS methods for the three active gauging stations
on Unga Man Creek and also at Russell Creek.
Table 4‐1: Estimated Flood Frequency and Magnitude at Unga Man and Russell Creek Gauging Stations
Flood Recurrence
Interval (Years)
Estimated Flood Magnitudes at Unga Man Creek Gauging Stations 1
Bridge Station North Fork Station South Fork Station
2 Years 400 170 150
5 Years 590 260 230
10 Years 730 320 280
25 Years 900 390 350
50 Years 1,030 450 400
100 Years 1,160 (1,500)2 510 450
200 Years 1,300 570 510
500 Years 1,480 (2,000)2 650 580
1. 5% and 95% confidence flows associated with these estimates are approximately 50% lower and 80 to
100% higher than the stated value, respectively. Calculated using methods in USGS 2003. Methods in
USGS 2016 generally produce lower flood estimates.
2. Flood magnitudes used for design of landfill access road bridge over Unga Man Creek (HDR 2007).
5 USGS 2003.
6 The minimum hydrology record for site‐specific flood frequency analysis is ten years (USGS 2018). A suitable
period of record for site‐specific flood frequency analysis does not yet exist at Unga Man Creek.
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5.0 STREAM GAUGE STATION INFORMATION
5.1 Bridge Gauging Station (Discontinued Station)
The bridge gauging station was installed on August 27, 2015 immediately downstream of the
landfill access road bridge over Unga Man Creek at RM 0.61. It was destroyed by a flood event
on June 26, 2019 and removed from service July 8, 2019. This station has not been restored to
service.
The station site was selected based on proximity to the bridge for ease of download and
maintenance, and presence of a large boulder, pool, and good pool outlet control (Photograph
5‐1). The site was expected to be more stable than adjacent reaches of Unga Man Creek due to
the bridge abutment rip‐rap helping to control stream meanders.
The station consisted of a three‐inch plastic stilling tube mounted with aluminum hardware and
rock bolts to a large boulder embedded in the creek bed river‐left of the thalweg. The stilling
tube was located in a shallow pool located in the eddy of the boulder. The station was fitted
with a outside staff (OSS) board ruled in feet located in the lee of the boulder.
Station hardware consisted of two Hobo U20 series sealed pressure transducer/data loggers
manufactured by Onset Computer Corporation (Onset). One (SN 10766117) was installed in the
stilling tube and was programmed to log absolute pressure (atmosphere + water column) and
water temperature at 30‐minute intervals. The logger was fitted in a PVC enclosure within the
stilling tube to prevent vertical movement. The second (SN 10766118) was located on the
bridge adjacent to the gauging station and also measured absolute pressure (atmosphere) and
air temperature at 30‐minute intervals. Water stage was calculated by subtracting the
atmospheric logger from the water logger. Approximately 5% of stage readings in the period of
record at this station have been estimated due to ice effects, sensor malfunction, or other
invalid data.
Outlet control at this gauging station is the natural cobble‐armored creek thalweg augmented
by a line of boulders and cobbles extending into the creek from the river‐left bank (Photograph
5‐1). The outlet control was shifted several times during the course of the study during high
water events. The station rating curve was adjusted accordingly based on subsequent site
measurements, flow measurements, and/or by review of the stage record.
Manual stage readings and logged water depths indicate that the gauging station and hardware
was stable and operating properly for the period of record, with no significant discrepancies or
sensor drift apparent in the stage record. Gaps in the period of record are summarized in Table
5‐1.
Table 5‐1: Bridge Gaging Station Period of Record Summary
Date Range Record Summary Notes
8/26/2015 to 7/18/2017 (692 days) Record complete. Station installed 8/26/2015.
7/18/2017 to 8/22/2017 (35 days) No data. Data loss due to download errors.
8/22/2017 to 3/23/2018 (213 days) Record complete.
3/23/2018 to 4/5/2019 (378 days) No data. Loggers lost or destroyed.
4/5/2019 to 7/4/2019 (90 days) Record complete. Station damaged by flood, not restored.
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Photograph 5‐1: Bridge Gauging Station Looking Upstream (8/18/2016)
Photograph 5‐2: Bridge Gauging
Station Looking Upstream After Flood
Damage (7/3/2019)
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5.2 Upper Gauging Station (Discontinued Station)
The upper gauging station was installed on August 27, 2015 approximately 1/4‐mile upstream
of the landfill road bridge over Unga Man Creek. The station site was intended to be located
farther upstream to measure stream flow more representative of prospective hydro intake sites
but was installed farther downstream than planned.
Details of construction and instrumentation were generally similar to those of the bridge
station, and are not described in detail. The station was decommissioned August 16, 2016 and
parts were recycled for the north fork gauging station. Both loggers are Hobo U20s, the water
logger is SN 10766116 and the barometric logger is SN 10766119. The known available record
for this station is August 27, 2015 1730h to July 11, 2016 1500h (water logger) and August 27,
2015 1730h to August 15, 2016 2200h (barometric logger). This data has not been analyzed.
5.3 North Fork Gauging Station (Current Station)
The north fork gauging station was installed on August 16, 2016 approximately 400 feet
upstream of the confluence between the north and south forks of Unga Man Creek (RM 1.65).
The station was still in good working order as of the most recent download in March 2021.
The station site was selected to collect hydrology information on the north fork of Unga Man
Creek. The specific site was selected based on the presence of a large boulder, pool, and pool
outlet control (Photograph 5‐3). The site is located on an extensive and recently active
floodplain (Photograph 5‐4), suggesting that the gauging station and site is susceptible to future
channel shifting and/or complete destruction.
The station consists of a three‐inch plastic stilling tube mounted with aluminum hardware and
rock bolts to a relatively large boulder embedded in the creek bed river‐right of the thalweg.
The stilling tube is located in an eddy pool adjacent to the boulder. Outlet control is a natural
line of boulders and cobbles located approximately 2 yards downstream of the installation. The
station is fitted with an OSS board ruled in decimal feet located roughly parallel with the main
flow of water adjacent to the boulder. A ½” rock bolt was set on the back side of the boulder
from the OSS board as an independent datum reference point (RP1). In August 2017, bed scour
had left RP1 dry at low flows, so a ¼” rock bolt (RP2) was set in the boulder just downstream of
the stilling tube.
Table 5‐2: Reference Points at North Fork Gauging Station
Name Description Elevation in OSS Datum
RP1 ½” rock bolt on opposite side of boulder from OSS board
Measure to top of bolt. +1.04 +/ 0.02 feet
RP2 ¼” rock bolt adjacent to and immediately downstream of OSS
board. Measure to top of double nut. +0.47 +/‐ 0.01 feet
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Original station hardware was a single Model MX2001 water level logger manufactured by
Onset (SN 20190906) and configured to log data every 15 minutes. This hardware consists of
two absolute pressure transducers (water and atmosphere sensors) connected via cable. The
atmospheric transducer is integrated with the data logger and also has Bluetooth
communications, enabling remote download (within ~30 foot proximity to the station) via
smartphone or other bluetooth‐capable device running the HoboMobile interface software.
The original MX 2001 logged significant intervals of no or invalid data during the period
November 4, 2016 through June 12, 2017. These may in part be due to exposure to below‐
freezing conditions, although the gaps persist well after the end of freezing temperatures in
spring 2017. Review of the stage record suggests the stage data is accurate for times when the
hardware was operating normally. The logger stopped recording data for unknown reasons on
July 17, 2017.
On August 22, 2017 this hardware was replaced with new MX2001 hardware also logging data
at 15‐minute intervals. This new hardware remains in service as of the most recent download.
The stage record from this new hardware also includes numerous episodes of invalid or atypical
stage readings, with each episode typically being about a day long but in several instances
lasting for several days. These episodes generally coincide with high flow events, and it is
unclear whether they represent an unstable flow regime or malfunctioning equipment under
high water conditions. In most instances, valid stage has been interpolated from adjacent
apparent valid data.
In total, 16% of the stage readings logged at this site over the period of record have been
estimated due to suspect or missing data.
Outlet control at this gauging station is the natural cobble‐armored creek bed. (Photograph 5‐
3). The outlet control shifted several times during the course of the study during high water
events. The station rating curve was adjusted accordingly based on subsequent site
measurements, flow measurements, and/or by review of the stage record.
During the August 22, 2017 site visit the stilling tube housing the PT was moved down 7.5
inches (0.63 feet) to keep the PT submerged during low flows. The OSS board was not moved.
Gaps in the period of record are summarized in Table 5‐3.
Table 5‐3: North Fork Gaging Station Period of Record Summary
Date Range Record Summary Notes
8/16/2016 to 7/12/2017 (330 days) Record complete.
Station installed 8/16/2016. Significant gaps
11/4/216 to 6/12/2017.
7/12/2017 to 8/22/2017 (41 days) No data. Data loss due to hardware failure.
8/22/2017 to 3/23/2018 (213 days) Record complete. New hardware installed.
3/23/2018 to 9/9/2018 (170 days) No data. Unknown error.
9/9/2018 to 9/17/2019 (373 days) Record complete.
9/17/2019 to 3/10/2021 (540 days) No data. Memory overrun.
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Photograph 5‐3: North Fork Gauging Station
Photograph 5‐4: Creek Morphology in Vicinity of North Fork Gauging Station
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Photograph 5‐5: Outlet Control at North Fork Gauging Station (August 22, 2017)
5.3 South Fork Gauging Station (Current Station)
The south fork gauging station was installed on August 17, 2016 approximately 200 feet
upstream of the confluence between the north and south forks of Unga Man Creek. The station
was still in good working order as of the most recent download in March 2021.
The station site was selected to collect hydrology information on the south fork of Unga Man
Creek. The specific site was selected based on presence of a large boulder, pool, and good pool
outlet control (Photograph 5‐6). South Fork Unga Man Creek at the gauging station is incised
approximately four to six feet into the general valley floor and flood plain. Flood plain
vegetation indicates the south fork has been generally stable in this incised channel for an
estimated 20 years.
The station consists of a three‐inch plastic stilling tube mounted with aluminum hardware and
rock bolts to a large boulder embedded in the river‐right creek bank. The stilling tube is located
in a pool located in the eddy of the boulder. Outlet control is a natural line of boulders and
cobbles located approximately 2 yards downstream of the installation.
During the August 2016 installation, two shallow ½‐inch holes were drilled in the rock as vertical
datum reference marks (RP1 and RP2) for manually measuring water stage. On August 22,
2017, a ¼” rock bolt was installed as RP3, adjacent to RP2. The top of the double nut on the
CITY OF FALSE PASS, ALASKA
HYDROLOGY REPORT FOR UNGA MAN CREEK NEAR FALSE PASS, AK POLARCONSULT ALASKA, INC.
DECEMBER 2021 PAGE 24 OF 27
bolt is the reference point for RP3, and is at the same elevation as RP2. An OSS board was also
installed at the site for manual stage readings (Photograph 5‐8), although this OSS board was
found partially destroyed (suspected bear activity) in March 2018.
Original station hardware was a single Model MX2001 water level logger manufactured by
Onset (SN 10944126), the same make/model as installed at the north fork station described in
Section 5.2. This hardware failed on March 15, 2017 and was recovered on June 5, 2017 with
bear bite marks but could not be downloaded.
The U20 loggers from the discontinued “upper” gauging station were installed at this station on
August 23, 2017. The water logger is SN 10766116 and the barometric logger is SN 10766119.
All loggers at this station have been programmed to record data at an 15‐minute interval.
Approximately 12% of stage readings in the period of record at this station have been
estimated due to ice effects, sensor malfunction, or other episodes of invalid data.
Outlet control at this gauging station is the natural cobble‐armored creek bed. (Photographs 5‐
6, 5‐7, 5‐8). The outlet control shifted several times during the course of the study during high
water events. The station rating curve was adjusted based on subsequent site measurements,
flow measurements, and/or by review of the stage record. Gaps in the period of record are
summarized in Table 5‐4.
Table 5‐4: South Fork Gaging Station Period of Record Summary
Date Range Record Summary Notes
8/17/2016 to 3/15/2017 (200 days) Record complete. Station installed 8/17/2016.
3/15/2017 to 8/22/2017 (170 days) No data. Data loss due to hardware error.
8/22/2017 to 9/11/2018 (385 days) Record complete.
9/11/2018 to 11/21/2018 (71 days) No data. Unknown error.
11/21/2018 to 10/5/2020 (684 days) Record complete.
Photograph 5‐6: South Fork Gauging Station Outlet Control Looking Downstream (Aug. 17, 2016)
CITY OF FALSE PASS, ALASKA
HYDROLOGY REPORT FOR UNGA MAN CREEK NEAR FALSE PASS, AK POLARCONSULT ALASKA, INC.
DECEMBER 2021 PAGE 25 OF 27
Photograph 5‐7: South Fork Gauging Station Outlet Control Looking Upstream (June 5, 2017)
Photograph 5‐8: South Fork Gauging Station Outlet Control Looking Downstream (August 22, 2017)
GAUGING
STATION
CITY OF FALSE PASS, ALASKA
HYDROLOGY REPORT FOR UNGA MAN CREEK NEAR FALSE PASS, AK POLARCONSULT ALASKA, INC.
DECEMBER 2021 PAGE 26 OF 27
Photograph 5‐8: South Fork Gauging Station OSS, RP1, RP2, and RP3 (August 23, 2017)
RP1 is ½‐inch drill hole
in rock. Measure
from top of hole
(see detail at right).
RP3 is top of double nut on ¼” bolt.
RP2 is ½‐inch drill hole in rock.
Measure from top of hole.
(see detail above).
CAUTION!!! There are two
drill holes on this rock face!
RP2 is the deeper hole at
upper left.
Red circle denotes RP1 – at
end of flow probe shaft.
SOUTH FORK VERTICAL DATUMS
RP1 = +5.48 +/‐ 0.01 in OSS datum.
RP2 = +5.51 +/‐ 0.01 in OSS datum.
RP3 = +5.51 +/‐ 0.01 in OSS datum.
RP3.
Red circle denotes RP2.
CITY OF FALSE PASS, ALASKA
HYDROLOGY REPORT FOR UNGA MAN CREEK NEAR FALSE PASS, AK POLARCONSULT ALASKA, INC.
DECEMBER 2021 PAGE 27 OF 27
REFERENCES
HDR 2007. False Pass Landfill Access Road, Hydrology and Hydraulic Study, Final Draft. HDR,
Inc. Anchorage, AK. May 2007.
USGS 2003. Estimating the Magnitude and Frequency of Peak Streamflows for Ungaged Sites
on Streams in Alaska and Conterminous Basins in Canada. Janet H. Curran, David
F. Meyer, and Gary D. Tasker. Water‐Resources Investigations Report (WRIR) 03‐
4188. Department of the Interior, U.S. Geological Survey. Anchorage, AK. 2003.
USGS 2010. Discharge Measurements at Gauging Stations. Chapter 8 of Book 3, Section A.
Techniques and Methods 3‐A8. D. Phil Turnipseed and Vernon B. Sauer. U.S.
Department of the Interior, U.S. Geological Survey. Reston, Virginia. 2010.
USGS 2016. Estimating Flood Magnitude and Frequency at Gaged and Ungaged Sites on
Streams in Alaska and Conterminous Basins in Canada, Based on on Data
through Water Year 2012. Janet H. Curran, Nancy A. Barth, Andrea G Veilleux,
and Robert T. Ourso. Scientific Investigations Report 2016‐5024. Department of
the Interior, U.S. Geological Survey. Reston, Virgina. 2016.
USGS 2018. Guidelines for determining flood flow frequency ‐‐ Bulletin 17C: U.S. Geological
Survey Techniques and Methods book 4, chap. B5, 148 p. England, J.F., Jr., Cohn,
T.A., Faber, B.A., Stedinger, J.R., Thomas, W.O., Jr., Veilleux, A.G., Kiang, J.E., and
Mason, R.R., Jr. U.S Geological Survey, Reston, Virgina. 2018.
https://doi.org/10.3133/tm4B5.
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
8/26/2015 12 66.9 69.4 71.7 52.1 53.3 54.5 0.58 0.59 0.60 -0.36 5.9 6.1 6.4 A
8/27/2015 48 54.0 64.1 74.1 50.5 52.5 65.5 0.58 0.59 0.60 -0.36 5.8 6.1 6.4 A:e
8/28/2015 48 53.6 59.6 67.2 47.6 50.3 52.6 0.57 0.59 0.65 -0.36 5.7 6.3 7.9 A
8/29/2015 48 51.2 61.3 67.2 50.3 52.0 54.3 0.58 0.64 0.91 -0.36 5.9 7.8 18.2 A
8/30/2015 48 46.0 52.4 63.3 47.8 49.8 52.8 0.65 0.73 0.92 -0.36 7.9 10.7 18.9 A
8/31/2015 48 41.6 50.3 63.3 45.8 48.0 51.5 0.62 0.64 0.66 -0.36 7.0 7.4 8.0 A
9/1/2015 48 44.7 52.7 60.5 46.2 48.3 51.3 0.61 0.66 0.76 -0.36 6.7 8.2 11.4 A
9/2/2015 48 54.5 56.4 60.4 49.4 50.7 51.7 0.68 0.76 1.01 -0.36 8.6 12.1 24.6 A
9/3/2015 48 52.6 56.2 60.2 50.1 50.9 52.2 0.72 0.78 0.90 -0.36 9.9 12.2 18.1 A
9/4/2015 48 48.7 53.0 58.8 48.3 49.8 51.3 0.69 0.73 0.78 -0.36 9.1 10.2 12.3 A
9/5/2015 48 48.2 53.8 64.5 48.2 49.6 51.9 0.70 0.72 0.77 -0.36 9.2 9.9 11.9 A
9/6/2015 48 46.2 53.2 61.4 47.1 48.5 49.8 0.68 0.70 0.75 -0.36 8.8 9.5 10.9 A
9/7/2015 48 45.3 49.6 55.7 46.9 48.0 49.4 0.67 0.69 0.73 -0.36 8.4 9.1 10.5 A
9/8/2015 48 44.0 49.9 58.3 46.5 47.9 49.1 0.66 0.68 0.73 -0.36 8.1 8.7 10.2 A
9/9/2015 48 42.4 49.0 55.7 46.5 47.5 49.2 0.67 0.70 0.75 -0.36 8.3 9.4 10.9 A
9/10/2015 48 44.7 50.2 59.9 46.7 47.9 49.9 0.76 1.06 1.27 -0.36 11.4 29.2 47.2A
9/11/2015 48 42.4 46.4 51.5 44.6 46.1 47.8 0.94 1.00 1.08 -0.36 20.0 23.7 29.6A
9/12/2015 48 41.3 48.4 58.1 44.0 45.4 47.1 0.87 0.91 0.96 -0.36 16.5 18.6 21.2A
9/13/2015 48 37.5 48.0 59.2 43.3 45.2 46.7 0.83 0.85 0.88 -0.36 14.4 15.2 16.6A
9/14/2015 48 47.4 56.9 70.0 46.2 48.3 51.9 0.80 0.82 0.85 -0.36 13.1 13.9 15.5A
9/15/2015 48 46.5 52.4 62.6 47.1 48.4 50.6 0.77 0.78 0.80 -0.36 11.8 12.4 13.2A
9/16/2015 48 42.0 50.0 59.5 45.6 47.2 48.7 0.74 0.75 0.77 -0.36 10.6 11.2 12.0A
9/17/2015 48 41.3 45.1 53.4 44.9 46.1 47.6 0.73 0.76 0.80 -0.36 10.4 11.6 13.2A
9/18/2015 48 41.1 45.3 56.6 43.5 45.1 47.4 0.77 0.79 0.86 -0.36 11.8 12.7 15.7A
9/19/2015 48 40.1 45.4 54.3 43.3 44.4 45.6 0.78 0.82 0.90 -0.36 12.1 13.9 17.9A
9/20/2015 48 40.5 45.0 52.6 43.3 44.3 45.5 0.77 0.92 1.04 -0.36 11.9 19.0 26.5A
9/21/2015 48 39.9 42.8 48.9 42.2 43.0 44.2 0.88 0.97 1.05 -0.36 16.9 21.9 27.4A
9/22/2015 48 39.0 42.5 49.4 41.6 42.9 44.6 0.93 0.96 1.00 -0.36 19.6 21.3 23.9A
9/23/2015 48 39.8 44.7 49.6 41.6 42.9 44.7 0.90 0.93 1.00 -0.36 17.8 19.8 23.7A
9/24/2015 48 46.9 49.7 57.8 44.6 45.4 47.1 1.00 1.04 1.08 -0.36 23.6 26.2 29.1A
9/25/2015 48 46.0 51.3 58.5 44.9 45.9 47.3 0.95 0.98 1.05 -0.36 20.6 22.4 27.3A
9/26/2015 48 51.3 55.6 62.8 47.1 48.3 49.9 0.96 1.02 1.21 -0.36 21.2 25.0 41.1A
9/27/2015 48 51.5 56.0 64.7 49.1 50.1 51.7 0.92 0.95 0.99 -0.36 19.2 20.5 23.3A
9/28/2015 48 38.4 45.8 51.5 43.5 47.1 50.1 0.92 0.99 1.10 -0.36 18.9 23.6 30.8A
9/29/2015 48 36.3 41.7 49.1 40.9 42.3 43.8 0.92 0.96 1.02 -0.36 19.0 21.5 25.4A
9/30/2015 48 41.6 46.9 51.3 42.7 43.6 44.9 0.96 0.99 1.03 -0.36 21.0 23.4 25.7A
10/1/2015 48 43.6 48.8 52.2 43.5 44.8 47.3 0.95 1.33 2.42 -0.36 20.8 79.9 347 A:e
10/2/2015 48 46.4 51.2 56.6 44.4 45.9 47.4 1.22 1.32 1.51 -0.36 42.1 53.2 78.6A
10/3/2015 48 46.0 52.8 66.7 44.2 45.7 48.0 1.12 1.16 1.22 -0.36 32.4 36.3 41.8A
10/4/2015 48 42.9 48.1 54.3 43.8 44.8 46.4 1.05 1.08 1.12 -0.36 26.9 29.4 32.4A
10/5/2015 48 46.0 49.8 59.0 44.7 45.6 47.4 1.04 1.20 1.52 -0.36 26.5 40.8 79.9A
10/6/2015 48 42.4 48.7 61.6 42.9 44.5 46.4 1.06 1.09 1.14 -0.36 27.6 30.4 34.1A
10/7/2015 48 34.2 43.3 54.3 41.8 43.2 44.9 1.02 1.04 1.09 -0.36 24.8 26.5 30.1A
10/8/2015 48 40.5 42.7 45.3 41.8 42.6 43.6 0.99 1.09 1.23 -0.36 23.2 30.7 43.1A
10/9/2015 48 42.7 46.2 47.8 42.7 43.9 45.1 1.17 1.46 1.91 -0.36 36.9 77.8 163 A:e
10/10/2015 48 38.8 44.9 47.8 41.3 43.8 44.7 1.39 1.53 1.69 -0.36 61.4 82 110 A:e
10/11/2015 48 36.9 39.5 46.2 39.6 40.5 41.6 1.40 1.48 1.64 -0.36 63.0 74.6 100 A:e
10/12/2015 48 35.0 40.1 47.8 39.8 40.6 42.4 1.31 1.36 1.41 -0.36 51.4 57.8 64.2 A
10/13/2015 48 31.0 38.8 47.3 38.6 40.3 42.9 1.25 1.57 2.33 -0.36 44.7 112 307 A:e
10/14/2015 48 44.4 46.5 50.3 42.5 43.0 43.6 1.67 1.98 2.58 -0.36 107 190 426 A:e
10/15/2015 48 39.8 46.5 51.7 42.2 42.7 43.6 1.40 1.51 1.65 -0.36 63.0 79.2 103 A:e
10/16/2015 48 39.9 46.1 53.6 42.4 42.9 44.0 1.29 1.34 1.40 -0.36 48.8 54.4 62.1 A
10/17/2015 48 40.9 43.4 49.1 42.2 42.7 43.6 1.20 1.24 1.30 -0.36 39.5 44.0 49.6 A
10/18/2015 48 33.2 41.8 57.8 39.8 41.3 42.9 1.11 1.14 1.20 -0.36 32.0 34.7 39.4 A
10/19/2015 48 41.6 45.3 48.0 42.0 42.7 43.5 1.09 1.18 1.26 -0.36 30.2 37.9 45.8 A
10/20/2015 48 40.7 44.4 52.1 41.3 42.7 43.8 1.14 1.17 1.23 -0.36 33.9 37.4 42.8 A
10/21/2015 48 38.6 42.3 52.8 40.3 41.2 42.7 1.09 1.11 1.14 -0.36 30.4 32.2 34.2 A
10/22/2015 48 32.6 40.3 46.4 39.4 40.9 42.5 1.06 1.13 1.28 -0.36 27.8 34.0 47.8 A
10/23/2015 48 43.1 45.8 53.3 42.0 42.8 44.4 1.14 1.18 1.26 -0.36 34.3 37.6 45.4 A
10/24/2015 48 34.8 42.7 47.1 40.3 42.0 43.1 1.10 1.12 1.16 -0.36 30.8 32.7 36.2 A
10/25/2015 48 42.0 43.9 45.5 41.8 42.2 42.9 1.10 1.50 1.81 -0.36 31.2 85 137 A:e
10/26/2015 48 41.6 45.8 49.6 42.7 43.0 43.5 1.41 1.50 1.66 -0.36 63.3 77.6 106 A:e
10/27/2015 48 37.1 43.5 49.4 40.9 42.2 43.5 1.24 1.31 1.40 -0.36 43.5 51.7 61.8 A
10/28/2015 48 38.3 44.1 49.2 40.7 41.7 42.7 1.17 1.20 1.24 -0.36 36.7 40.1 43.9 A
10/29/2015 48 38.3 42.5 45.6 40.5 42.1 42.7 1.15 1.19 1.28 -0.36 35.1 39.2 47.9 A
10/30/2015 48 35.2 38.5 42.7 38.4 39.2 40.3 1.10 1.14 1.18 -0.36 30.8 34.1 38.1 A
10/31/2015 48 36.9 42.6 55.7 38.4 39.4 41.1 1.06 1.08 1.10 -0.36 27.7 29.3 31.3 A
11/1/2015 48 38.6 46.5 55.2 39.8 41.4 42.5 1.01 1.04 1.06 -0.36 24.2 26.4 28.2A
11/2/2015 48 37.5 41.0 43.8 39.9 40.8 41.8 0.99 1.02 1.10 -0.36 22.9 25.3 31.3A
11/3/2015 48 33.4 41.2 50.6 39.2 40.1 40.9 0.99 1.03 1.09 -0.36 22.9 25.9 30.5A
11/4/2015 48 39.8 42.3 45.1 39.0 40.0 40.5 0.98 1.16 1.59 -0.36 22.3 39.7 91 A
11/5/2015 48 40.7 42.6 44.2 40.1 40.6 40.9 1.40 1.52 1.67 -0.36 62.6 80 107 A:e
11/6/2015 48 39.4 41.3 44.6 38.6 39.4 40.1 1.32 1.40 1.53 -0.36 52.4 63.0 81 A
11/7/2015 48 44.6 46.2 49.2 39.9 40.7 41.4 1.21 1.25 1.33 -0.36 40.4 45.0 54.0A
11/8/2015 48 33.4 43.8 51.0 38.6 41.5 42.9 1.19 1.27 1.39 -0.36 38.5 47.6 60.8A
11/9/2015 48 31.0 35.5 44.2 36.0 37.1 38.4 1.07 1.15 1.19 -0.36 28.8 35.2 38.5A
11/10/2015 48 33.0 36.7 43.1 35.2 36.3 37.7 1.10 1.16 1.89 -0.36 30.7 38.4 157 A:e
11/11/2015 48 32.0 37.6 44.9 32.2 36.2 38.4 1.42 1.59 2.03 -0.36 65.0 94 198 A:e
11/12/2015 48 30.6 32.2 34.2 32.8 34.3 35.2 1.25 1.33 1.41 -0.36 44.9 53.5 63.7 A
11/13/2015 48 30.0 32.0 37.9 34.4 35.3 36.7 1.17 1.21 1.26 -0.36 36.5 40.6 46.0 A
11/14/2015 48 31.2 36.2 47.1 36.1 36.8 37.7 1.10 1.14 1.16 -0.36 31.3 33.9 36.3 A
11/15/2015 48 26.9 31.5 41.6 35.6 36.2 37.1 1.04 1.07 1.11 -0.36 26.5 28.7 32.1 A
11/16/2015 48 29.8 32.1 35.2 35.4 36.1 36.5 0.98 1.02 1.05 -0.36 22.7 24.8 27.3 A
11/17/2015 48 32.2 37.3 48.0 35.2 36.7 38.1 0.95 0.98 1.00 -0.36 20.8 22.3 23.6 A
11/18/2015 48 35.6 40.6 45.8 36.7 38.0 39.2 0.94 0.98 1.00 -0.36 20.3 22.3 24.0 A
11/19/2015 48 37.1 42.6 45.5 33.8 36.9 38.3 1.00 1.59 2.49 -0.36 23.9 116 382 A:e
11/20/2015 48 33.2 38.0 43.8 36.0 37.6 38.3 1.26 1.30 1.36 -0.36 45.3 50.1 56.7 A
11/21/2015 48 32.4 36.0 48.0 35.2 35.7 36.3 1.15 1.20 1.25 -0.36 35.3 39.5 44.4 A
11/22/2015 48 29.2 36.8 41.1 35.8 36.5 37.9 1.10 1.13 1.21 -0.36 31.3 33.7 41.0 A
11/23/2015 48 39.9 42.0 44.6 37.1 37.6 38.1 1.25 1.76 2.28 -0.36 44.4 136 286 A:e
11/24/2015 48 29.6 38.5 46.4 36.5 37.3 37.9 1.30 1.40 1.51 -0.36 50.4 62.3 78.3 A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 1 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
11/25/2015 48 28.8 35.6 47.4 36.3 36.9 37.7 1.20 1.24 1.30 -0.36 39.6 44.2 50.3 A
11/26/2015 48 27.3 36.9 40.1 36.0 37.0 38.1 1.16 1.25 1.43 -0.36 35.8 46.0 66.4 A
11/27/2015 48 35.2 38.0 45.8 37.7 38.0 38.4 1.20 1.25 1.35 -0.36 39.7 44.5 56.2 A
11/28/2015 48 29.0 34.7 42.4 35.4 35.8 37.9 1.11 1.15 1.21 -0.36 31.9 35.3 40.3 A
11/29/2015 48 31.0 36.8 38.8 35.6 36.7 37.3 1.09 1.17 1.27 -0.36 30.5 37.1 46.6 A
11/30/2015 48 36.1 37.8 40.1 37.1 37.4 37.9 1.20 1.26 1.36 -0.36 39.6 46.4 57.4 A
12/1/2015 48 33.0 36.2 39.2 34.8 36.7 37.9 1.27 1.35 1.42 -0.36 46.4 56.1 65.2A
12/2/2015 48 26.7 32.0 37.1 34.6 34.9 35.6 1.18 1.24 1.31 -0.36 38.0 43.5 51.3A
12/3/2015 48 29.4 34.5 45.3 35.2 36.1 36.9 1.13 1.16 1.18 -0.36 33.5 35.7 38.0A
12/4/2015 48 32.0 36.1 45.3 36.5 36.9 37.1 1.08 1.10 1.14 -0.36 29.1 31.4 34.2A
12/5/2015 48 30.6 36.5 40.3 36.5 37.3 38.1 1.05 1.08 1.12 -0.36 27.3 29.3 32.2A
12/6/2015 48 38.4 39.8 41.8 37.5 37.7 37.9 1.12 1.19 1.25 -0.36 32.2 38.5 45.0A
12/7/2015 48 33.4 36.3 38.6 36.9 37.2 37.5 -0.40 1.14 1.33 -0.36 36.1 44.6 53.9 A
12/8/2015 48 32.6 36.2 39.4 36.7 37.4 38.1 1.09 1.11 1.16 -0.36 30.1 32.1 35.6A
12/9/2015 48 36.1 37.8 39.4 37.5 37.7 37.9 1.09 1.11 1.14 -0.36 30.1 31.9 34.5A
12/10/2015 48 31.6 34.8 38.3 35.0 36.2 37.5 1.02 1.05 1.09 -0.36 24.9 27.4 30.0 A
12/11/2015 48 27.1 29.3 32.4 33.6 34.1 35.0 0.97 1.00 1.03 -0.36 21.9 23.8 25.4 A
12/12/2015 48 19.2 29.0 41.6 33.6 34.2 35.2 0.94 0.96 1.03 -0.36 20.0 21.5 26.1 A
12/13/2015 48 35.0 38.7 44.2 34.2 34.7 35.4 1.06 1.21 1.52 -0.36 28.2 42.0 79.7 A
12/14/2015 48 31.2 35.6 40.5 34.6 34.9 35.6 1.01 1.04 1.11 -0.36 24.2 26.3 32.0 A
12/15/2015 48 26.5 32.4 36.9 33.8 34.8 36.0 0.99 1.03 1.13 -0.36 23.2 25.6 33.5 A
12/16/2015 48 30.6 32.5 36.0 34.2 35.2 36.0 0.94 0.97 0.99 -0.36 19.9 22.0 23.4 A:e
12/17/2015 48 30.0 32.4 36.7 33.6 34.3 35.4 0.91 0.93 0.95 -0.36 18.4 19.4 20.5 A:e
12/18/2015 48 35.4 38.4 42.2 35.2 35.6 36.0 0.94 1.14 1.30 -0.36 20.1 34.9 49.7 A
12/19/2015 48 33.6 35.6 38.4 34.4 34.8 35.6 0.96 1.00 1.05 -0.36 21.5 23.8 27.2 A
12/20/2015 48 28.3 36.0 47.4 34.0 34.8 36.0 0.93 0.95 0.98 -0.36 19.4 20.7 22.2 A
12/21/2015 48 30.6 33.0 37.9 32.8 34.4 36.0 0.91 0.93 0.95 -0.36 18.4 19.3 20.5 A:e
12/22/2015 48 25.8 31.3 41.6 33.8 34.1 34.4 0.87 0.89 0.92 -0.36 16.2 17.4 18.9 A
12/23/2015 48 29.4 35.5 43.8 34.2 35.2 36.7 0.86 0.88 0.99 -0.36 15.6 16.9 22.8 A
12/24/2015 48 37.7 40.7 43.5 35.8 36.6 36.7 0.94 1.12 1.84 -0.36 20.3 37.3 145 A:e
12/25/2015 48 35.4 37.8 41.3 35.2 35.8 36.5 1.29 1.57 1.99 -0.36 48.9 95 185 A:e
12/26/2015 48 32.6 38.0 41.3 36.1 36.6 36.9 1.16 1.22 1.28 -0.36 36.2 41.4 47.8 A
12/27/2015 48 35.4 38.8 41.6 36.0 36.8 37.5 1.14 1.18 1.23 -0.36 34.7 38.3 42.7 A
12/28/2015 48 35.6 38.0 41.1 36.0 36.5 36.7 1.13 1.21 1.33 -0.36 33.5 40.6 54.0 A
12/29/2015 48 33.4 38.2 40.1 36.0 36.8 37.5 1.10 1.13 1.19 -0.36 30.9 33.4 38.3 A
12/30/2015 48 32.6 34.4 36.3 34.4 35.3 36.3 1.06 1.08 1.10 -0.36 27.8 29.6 30.9 A
12/31/2015 48 28.3 33.8 41.3 35.0 35.8 36.7 1.01 1.04 1.06 -0.36 24.2 26.3 28.2 A
1/1/2016 48 34.0 35.6 36.7 35.8 36.1 36.3 1.00 1.07 1.17 -0.36 23.5 29.0 36.5 A
1/2/2016 48 31.2 36.2 45.3 36.1 36.4 37.1 1.03 1.08 1.14 -0.36 25.5 29.1 34.1 A
1/3/2016 48 31.0 33.4 35.4 35.0 35.6 36.3 0.99 1.00 1.03 -0.36 23.0 24.1 25.6 A
1/4/2016 48 32.0 34.2 36.5 33.8 35.7 36.3 1.03 1.07 1.13 -0.36 25.6 28.9 33.5 A
1/5/2016 48 31.8 34.4 42.2 33.4 34.2 35.0 1.00 1.03 1.05 -0.36 23.6 26.0 27.4 A
1/6/2016 48 34.8 37.6 39.2 35.0 35.6 36.0 0.98 1.00 1.06 -0.36 22.4 23.8 27.6 A
1/7/2016 48 28.6 33.9 36.3 35.2 35.7 36.0 0.95 0.99 1.05 -0.36 20.5 23.3 27.4 A
1/8/2016 48 32.2 33.9 35.8 34.2 35.0 35.8 0.91 0.94 0.96 -0.36 18.5 20.2 21.0 A
1/9/2016 48 32.4 35.6 38.3 34.6 35.5 36.1 0.91 0.94 0.98 -0.36 18.5 20.1 22.5 A
1/10/2016 48 29.6 33.3 39.2 34.2 34.8 35.6 0.87 0.89 0.91 -0.36 16.4 17.4 18.6A
1/11/2016 48 28.3 33.9 40.3 35.2 35.6 36.5 0.84 0.86 0.87 -0.36 15.0 15.7 16.5A
1/12/2016 48 24.1 28.2 39.4 34.2 34.6 35.2 0.81 0.83 0.84 -0.36 13.5 14.2 15.0A
1/13/2016 48 24.7 33.7 37.5 34.4 35.4 36.3 0.79 0.80 0.81 -0.36 12.6 13.3 13.7A
1/14/2016 48 35.2 37.6 40.1 35.8 36.5 37.5 0.79 0.84 0.97 -0.36 12.7 15.3 22.0A
1/15/2016 48 36.7 39.0 40.9 36.3 36.6 36.9 0.90 0.92 0.96 -0.36 17.8 19.1 20.9A
1/16/2016 48 35.4 37.3 39.8 36.3 36.6 36.9 0.87 0.89 0.92 -0.36 16.2 17.2 18.8A
1/17/2016 48 34.2 36.6 39.2 36.0 36.6 37.3 0.89 0.94 0.98 -0.36 17.3 20.3 22.5A
1/18/2016 48 34.0 37.7 47.4 35.8 36.6 42.0 0.95 1.01 1.07 -0.36 20.9 24.3 28.3A
1/19/2016 48 29.8 35.4 40.9 36.0 36.5 38.4 0.10 0.91 0.95 -0.36 18.1 19.4 20.9A
1/20/2016 48 29.8 35.4 39.9 35.4 36.2 37.5 0.89 0.90 0.92 -0.36 17.1 17.6 18.8A
1/21/2016 48 30.4 37.0 47.3 35.8 36.2 36.7 0.86 0.88 0.89 -0.36 15.8 16.6 17.4A
1/22/2016 48 27.9 30.8 34.2 34.8 35.6 36.5 0.83 0.85 0.87 -0.36 14.4 15.1 16.2A
1/23/2016 48 31.0 34.8 41.3 35.8 36.2 36.9 0.81 0.82 0.83 -0.36 13.5 14.1 14.6A
1/24/2016 48 34.2 37.3 44.4 36.0 36.6 37.7 0.80 0.81 0.82 -0.36 12.9 13.4 13.9A
1/25/2016 48 36.5 37.5 39.9 36.3 36.8 37.3 0.80 0.97 1.09 -0.36 12.9 22.3 30.2A
1/26/2016 48 35.2 37.1 42.5 36.0 36.7 37.9 0.89 0.95 1.04 -0.36 17.5 20.7 26.4A
1/27/2016 48 32.6 34.8 38.4 35.0 36.2 37.5 0.84 0.87 0.89 -0.36 15.0 16.4 17.5A
1/28/2016 48 25.4 32.5 37.1 33.8 34.7 36.0 0.81 0.83 0.85 -0.36 13.6 14.5 15.3A
1/29/2016 48 31.4 35.8 39.6 34.6 35.3 36.3 0.79 0.84 0.98 -0.36 12.8 14.9 22.5A
1/30/2016 48 32.6 37.4 42.0 34.8 35.9 36.7 0.99 1.15 1.41 -0.36 22.8 36.4 64.2A
1/31/2016 48 31.8 34.7 42.4 34.2 35.0 36.5 0.97 1.02 1.12 -0.36 21.8 25.3 32.6A
2/1/2016 48 28.6 33.9 44.9 34.2 35.3 36.3 0.91 0.94 0.97 -0.36 18.5 19.8 21.7 A
2/2/2016 48 31.8 33.9 36.5 35.2 35.7 36.3 0.88 0.89 0.92 -0.36 16.9 17.6 18.8 A
2/3/2016 48 32.6 34.5 38.1 34.6 35.3 36.3 0.87 0.88 0.90 -0.36 16.1 17.0 17.7 A
2/4/2016 48 34.8 36.2 38.3 35.8 36.2 37.1 0.88 0.95 1.00 -0.36 16.9 20.7 23.9 A
2/5/2016 48 32.2 35.7 39.6 35.4 36.4 37.3 0.95 0.97 0.99 -0.36 20.4 21.9 23.2 A
2/6/2016 48 32.8 36.7 40.3 35.0 36.1 37.5 0.91 0.92 0.95 -0.36 18.1 19.1 20.5 A
2/7/2016 48 31.4 37.0 47.8 35.2 36.2 37.7 0.86 0.88 0.91 -0.36 15.8 16.7 18.3 A
2/8/2016 48 35.0 37.9 48.7 35.8 36.7 38.3 0.83 0.85 0.87 -0.36 14.5 15.3 16.1 A
2/9/2016 48 36.7 38.5 40.5 36.7 37.1 38.1 0.83 0.86 0.92 -0.36 14.2 16.1 18.8 A
2/10/2016 48 34.4 36.4 37.9 35.8 36.5 37.1 0.87 0.89 0.91 -0.36 16.3 17.1 18.2A
2/11/2016 48 36.0 38.1 42.0 36.7 37.4 38.6 0.87 0.89 0.92 -0.36 16.2 17.3 18.7A
2/12/2016 48 33.8 36.3 39.4 36.5 37.2 38.3 0.87 0.88 0.90 -0.36 16.1 16.8 17.9A
2/13/2016 48 35.0 36.9 39.0 36.9 37.3 38.1 0.87 0.88 0.91 -0.36 16.2 16.9 18.5A
2/14/2016 48 35.8 37.0 39.8 36.7 37.2 38.3 0.91 0.94 0.97 -0.36 18.5 20.0 22.0A
2/15/2016 48 30.8 38.8 52.6 36.0 36.9 38.4 0.90 0.93 0.98 -0.36 17.9 19.7 22.2A
2/16/2016 48 33.0 36.8 40.1 34.4 36.0 37.1 0.88 0.93 1.02 -0.36 16.7 19.5 25.0A
2/17/2016 48 29.4 35.0 40.1 33.6 35.2 36.3 0.92 0.98 1.04 -0.36 18.8 22.3 26.3A
2/18/2016 48 28.1 33.3 51.9 33.6 34.5 36.3 0.87 0.90 0.92 -0.36 16.2 17.7 18.9A
2/19/2016 48 27.5 31.6 36.7 34.2 35.1 36.7 0.84 0.86 0.88 -0.36 14.7 15.6 16.8A
2/20/2016 48 32.6 33.9 37.3 34.4 35.5 37.3 0.82 0.83 0.85 -0.36 13.8 14.6 15.4A
2/21/2016 48 31.6 33.0 34.6 34.0 34.7 35.2 0.76 0.81 0.82 -0.36 11.5 13.4 14.1A
2/22/2016 48 21.4 30.6 42.2 33.0 34.3 35.8 0.76 0.78 0.81 -0.36 11.4 12.5 13.3A
2/23/2016 48 34.0 36.6 40.1 35.2 36.2 37.9 0.76 0.78 0.79 -0.36 11.4 12.1 12.8A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 2 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
2/24/2016 48 33.6 37.3 43.6 34.6 36.3 38.6 0.79 0.82 0.84 -0.36 12.7 14.0 14.6A
2/25/2016 48 36.3 39.0 41.4 36.3 37.1 38.6 0.79 0.81 0.83 -0.36 12.8 13.6 14.6A
2/26/2016 48 34.0 36.9 41.4 36.1 37.2 38.8 0.83 0.85 0.89 -0.36 14.5 15.6 17.2A
2/27/2016 48 31.6 37.4 46.4 36.0 37.3 39.6 0.83 0.85 0.88 -0.36 14.4 15.3 17.0A
2/28/2016 48 33.4 36.6 46.0 36.0 36.9 39.4 0.79 0.81 0.83 -0.36 12.7 13.7 14.6A
2/29/2016 48 32.0 34.8 37.5 33.8 35.4 36.5 0.78 0.80 0.83 -0.36 12.3 13.2 14.4A
3/1/2016 48 32.4 37.2 42.4 34.4 35.9 37.5 0.78 0.79 0.81 -0.36 12.2 12.9 13.5 A
3/2/2016 48 35.2 38.8 44.0 35.8 37.1 39.2 0.77 0.78 0.81 -0.36 11.7 12.5 13.6 A
3/3/2016 48 29.2 38.1 50.1 35.0 36.9 39.4 0.77 0.80 0.81 -0.36 12.0 12.9 13.6 A
3/4/2016 48 28.6 34.0 40.9 35.0 36.1 38.1 0.75 0.77 0.80 -0.36 11.0 12.0 13.0 A
3/5/2016 48 23.4 28.4 32.0 33.0 34.1 36.1 0.72 0.74 0.76 -0.36 10.1 10.7 11.4 A
3/6/2016 48 16.8 28.7 45.5 32.8 34.2 36.9 0.68 0.72 0.76 -0.36 8.8 10.0 11.3 A
3/7/2016 48 20.5 29.6 48.2 32.8 34.4 37.1 0.68 0.70 0.74 -0.36 8.6 9.4 10.6 A
3/8/2016 48 20.8 32.9 49.4 33.2 35.3 38.8 0.68 0.69 0.71 -0.36 8.7 9.1 9.8 A
3/9/2016 48 32.0 35.0 48.2 34.2 36.2 40.7 0.68 0.70 0.71 -0.36 8.7 9.2 9.8 A
3/10/2016 48 31.6 33.7 41.3 32.6 35.3 38.1 0.62 0.69 0.73 -0.36 6.9 9.0 10.2 A
3/11/2016 48 31.6 36.9 46.0 34.4 36.6 40.5 0.67 0.70 0.74 -0.36 8.4 9.3 10.8 A
3/12/2016 48 32.2 35.1 39.0 34.8 35.9 37.7 0.72 0.74 0.77 -0.36 10.0 10.8 11.8A
3/13/2016 48 31.6 35.6 48.9 34.4 35.9 38.8 0.69 0.71 0.73 -0.36 9.2 9.8 10.4 A
3/14/2016 48 28.6 34.9 44.4 34.0 35.7 38.8 0.68 0.69 0.70 -0.36 8.6 9.0 9.4 A
3/15/2016 48 24.1 35.1 53.8 33.2 35.5 39.0 0.63 0.67 0.69 -0.36 7.1 8.3 9.2 A
3/16/2016 48 29.4 33.9 48.2 34.6 36.2 39.2 0.65 0.66 0.68 -0.36 7.8 8.2 8.8 A
3/17/2016 48 27.1 30.7 34.2 32.8 34.5 36.1 0.62 0.65 0.67 -0.36 7.0 7.8 8.4 A
3/18/2016 48 32.2 34.3 38.3 32.6 35.1 37.3 0.63 0.67 0.68 -0.36 7.2 8.3 8.7 A
3/19/2016 48 29.8 33.0 37.1 35.0 36.2 38.1 0.64 0.65 0.67 -0.36 7.5 7.9 8.5 A
3/20/2016 48 23.7 25.7 28.6 32.8 33.6 35.0 0.60 0.63 0.64 -0.36 6.5 7.1 7.6 A
3/21/2016 48 23.9 28.3 32.2 32.4 34.0 37.3 0.60 0.62 0.64 -0.36 6.5 6.9 7.4 A
3/22/2016 48 30.8 32.0 33.8 33.0 35.1 37.3 0.61 0.62 0.63 -0.36 6.7 7.0 7.3 A
3/23/2016 48 29.6 32.2 36.5 34.6 36.1 39.2 0.60 0.61 0.62 -0.36 6.4 6.7 6.9 A
3/24/2016 48 30.8 34.6 45.1 34.8 37.1 40.5 0.59 0.61 0.62 -0.36 6.2 6.7 7.1 A
3/25/2016 48 32.0 38.2 52.2 35.0 38.0 42.9 0.60 0.63 0.67 -0.36 6.6 7.3 8.3 A
3/26/2016 48 33.4 38.6 49.1 35.8 37.9 40.9 0.63 0.65 0.70 -0.36 7.1 7.9 9.5 A
3/27/2016 48 33.8 42.5 55.5 35.4 37.1 39.4 0.71 1.00 1.13 -0.36 9.8 25.1 33.7 A
3/28/2016 48 29.8 40.2 59.2 34.0 36.7 41.6 0.87 0.93 1.05 -0.36 16.5 19.8 27.6A
3/29/2016 48 32.4 37.6 54.3 35.0 36.8 39.2 0.81 0.84 0.91 -0.36 13.6 15.1 18.4A
3/30/2016 48 33.0 37.9 44.0 33.4 35.7 38.3 0.80 0.87 1.02 -0.36 13.0 16.5 24.8A
3/31/2016 48 39.9 41.1 42.5 35.8 36.3 37.1 1.02 1.12 1.25 -0.36 24.8 33.4 44.5A
4/1/2016 48 36.5 39.8 44.4 35.2 36.5 39.0 1.14 1.19 1.25 -0.36 34.6 39.3 45.0 A
4/2/2016 48 34.8 38.5 44.6 35.0 36.3 37.7 1.05 1.08 1.15 -0.36 27.1 29.3 34.8 A
4/3/2016 48 34.4 36.3 38.3 35.6 36.2 36.9 1.02 1.04 1.07 -0.36 24.8 26.5 28.7 A
4/4/2016 48 36.1 39.4 45.6 36.0 37.2 39.6 1.06 1.08 1.12 -0.36 28.1 29.8 32.8 A
4/5/2016 48 36.9 40.2 46.4 36.3 37.5 39.8 1.06 1.11 1.15 -0.36 28.3 31.6 35.6 A
4/6/2016 48 35.4 38.9 48.0 35.8 37.2 39.9 1.06 1.09 1.14 -0.36 28.0 30.4 34.7 A
4/7/2016 48 35.2 38.6 44.7 36.1 37.4 39.6 1.01 1.04 1.07 -0.36 24.7 26.5 28.6 A
4/8/2016 48 35.0 38.4 46.5 36.0 37.5 41.1 1.03 1.04 1.05 -0.36 25.6 26.6 27.5 A
4/9/2016 48 34.2 40.2 52.4 36.0 37.8 41.1 0.99 1.02 1.04 -0.36 23.2 25.0 26.7 A
4/10/2016 48 35.6 39.4 48.7 36.3 37.8 39.8 0.98 1.01 1.02 -0.36 22.7 24.1 25.1A
4/11/2016 48 32.4 39.0 49.1 35.8 38.2 41.6 0.95 0.98 1.01 -0.36 20.9 22.2 24.5A
4/12/2016 48 36.1 38.8 43.3 36.9 37.8 39.6 0.96 0.98 1.01 -0.36 21.5 22.8 24.7A
4/13/2016 48 32.2 36.4 39.9 35.8 36.9 38.3 0.95 0.98 1.01 -0.36 20.9 22.5 24.3A
4/14/2016 48 35.0 38.9 45.1 36.0 37.4 39.8 0.98 1.01 1.07 -0.36 22.3 24.5 28.9A
4/15/2016 48 33.4 38.7 42.9 35.2 37.3 39.0 1.06 1.12 1.17 -0.36 28.3 32.9 36.7A
4/16/2016 48 32.6 38.4 48.3 34.2 36.8 41.4 1.05 1.09 1.13 -0.36 27.3 30.0 33.1A
4/17/2016 48 34.0 36.6 38.3 35.4 36.1 37.1 1.06 1.12 1.27 -0.36 27.6 33.2 46.6A
4/18/2016 48 36.1 39.8 43.5 36.1 36.9 38.1 1.28 1.35 1.39 -0.36 47.5 55.8 60.7A
4/19/2016 48 34.2 38.4 44.4 35.6 37.1 39.2 1.20 1.23 1.31 -0.36 39.5 43.0 51.6A
4/20/2016 48 37.3 38.8 40.7 36.1 36.7 36.9 1.19 1.44 1.79 -0.36 38.4 72.3 133 A:e
4/21/2016 48 38.4 39.5 40.7 35.8 36.1 36.5 1.76 1.80 1.83 -0.36 126 134 141 A:e
4/22/2016 48 38.3 41.0 44.6 36.1 36.9 38.1 1.55 1.64 1.75 -0.36 85 101 124 A:e
4/23/2016 48 36.7 42.5 52.9 36.3 38.0 41.1 1.40 1.45 1.54 -0.36 61.9 69.8 83 A
4/24/2016 48 40.1 41.5 43.8 36.9 37.3 37.9 1.44 1.50 1.53 -0.36 68.6 76.7 82 A
4/25/2016 48 38.1 42.6 52.8 36.5 37.8 40.5 1.41 1.45 1.50 -0.36 63.3 69.1 77.5A
4/26/2016 48 35.6 40.8 47.4 36.1 37.7 39.6 1.35 1.39 1.43 -0.36 56.3 61.4 66.6A
4/27/2016 48 37.3 39.3 43.1 36.5 37.3 38.3 1.37 1.39 1.42 -0.36 58.2 61.4 65.2A
4/28/2016 48 36.7 42.5 49.4 36.5 38.1 40.3 1.32 1.35 1.40 -0.36 52.5 55.7 62.9A
4/29/2016 48 32.8 42.1 51.5 36.0 38.0 40.3 1.23 1.27 1.33 -0.36 42.9 47.0 54.0A
4/30/2016 48 38.8 41.0 46.0 37.1 38.0 39.4 1.23 1.25 1.29 -0.36 42.6 45.0 48.7A
5/1/2016 48 36.3 41.1 50.3 36.5 38.5 42.5 1.29 1.33 1.36 -0.36 48.8 53.4 57.8 A
5/2/2016 48 35.2 40.0 50.6 36.0 37.7 40.3 1.22 1.26 1.33 -0.36 41.7 45.6 54.0 A
5/3/2016 48 36.5 41.8 51.2 36.7 38.7 41.8 1.19 1.24 1.39 -0.36 38.6 44.0 61.5 A
5/4/2016 48 32.2 43.6 61.7 35.8 38.6 42.5 1.22 1.25 1.35 -0.36 41.4 45.2 56.5 A
5/5/2016 48 38.3 43.1 53.3 37.3 38.5 40.9 1.20 1.24 1.30 -0.36 39.9 43.5 50.2 A
5/6/2016 48 36.3 41.5 51.0 36.0 38.6 43.3 1.25 1.28 1.31 -0.36 44.3 47.6 51.5 A
5/7/2016 48 39.0 42.3 47.6 37.1 38.5 41.3 1.21 1.30 1.46 -0.36 40.5 51.6 70.8 A
5/8/2016 48 40.1 43.7 47.8 36.9 38.3 40.7 1.44 1.53 1.58 -0.36 68.4 81 90 A
5/9/2016 48 39.9 41.2 43.3 37.3 37.6 38.6 1.44 1.47 1.57 -0.36 68.5 72.7 87 A
5/10/2016 48 40.5 42.7 46.4 36.7 37.4 38.6 1.59 1.77 1.88 -0.36 92 128 154 A:e
5/11/2016 48 37.5 42.3 48.2 36.1 37.6 39.4 1.45 1.54 1.72 -0.36 69.3 84 116 A:e
5/12/2016 48 36.9 43.6 54.8 36.3 38.9 43.1 1.35 1.39 1.45 -0.36 55.6 61.6 69.3A
5/13/2016 48 35.8 42.6 47.4 36.5 38.1 39.8 1.29 1.32 1.37 -0.36 48.6 52.3 59.0A
5/14/2016 48 35.6 48.3 65.5 36.7 40.2 45.8 1.27 1.35 1.48 -0.36 46.4 56.7 73.5A
5/15/2016 48 36.9 51.7 73.6 36.7 40.5 46.4 1.29 1.39 1.50 -0.36 49.0 61.0 77.0A
5/16/2016 48 39.9 52.5 68.9 37.5 40.1 43.5 1.37 1.46 1.58 -0.36 58.5 70.9 90 A
5/17/2016 48 36.3 49.3 72.4 36.3 39.9 45.3 1.35 1.43 1.55 -0.36 55.6 66.8 85 A
5/18/2016 48 40.7 45.5 61.7 37.1 39.3 44.7 1.28 1.34 1.43 -0.36 47.8 54.6 66.1A
5/19/2016 48 39.2 42.3 45.3 36.7 38.2 39.6 1.20 1.24 1.30 -0.36 39.8 43.4 50.3A
5/20/2016 48 39.6 41.5 43.8 37.5 38.6 39.9 1.19 1.25 1.33 -0.36 39.1 45.3 53.5A
5/21/2016 48 35.0 41.9 47.3 36.3 38.5 40.9 1.18 1.23 1.36 -0.36 37.9 42.9 56.8A
5/22/2016 48 43.3 47.3 54.5 38.3 39.3 41.3 1.35 1.40 1.44 -0.36 56.0 62.6 67.7A
5/23/2016 48 37.1 45.1 52.6 36.5 39.1 41.4 1.22 1.26 1.34 -0.36 41.7 45.7 55.0A
5/24/2016 48 42.7 46.5 54.5 38.1 40.4 45.3 1.18 1.23 1.28 -0.36 38.2 42.4 48.5A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 3 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
5/25/2016 48 35.6 46.7 60.0 36.5 41.1 48.3 1.15 1.22 1.29 -0.36 35.6 41.9 48.5A
5/26/2016 48 40.7 49.1 65.2 37.5 41.5 48.5 1.15 1.22 1.29 -0.36 34.9 41.4 49.6A
5/27/2016 48 42.9 48.5 59.3 38.3 40.7 45.5 1.15 1.21 1.28 -0.36 35.5 40.5 48.5A
5/28/2016 48 42.9 46.9 52.2 38.4 39.9 41.6 1.26 1.30 1.33 -0.36 45.4 49.8 53.2A
5/29/2016 48 43.1 46.4 50.8 38.4 39.8 42.0 1.26 1.28 1.31 -0.36 45.3 48.4 51.8A
5/30/2016 48 42.4 44.4 47.3 38.6 39.2 40.5 1.26 1.29 1.36 -0.36 45.4 49.4 56.9A
5/31/2016 48 42.2 44.3 46.5 38.3 38.8 39.4 1.35 1.56 1.81 -0.36 56.6 89 137 A:e
6/1/2016 48 43.6 47.0 51.9 38.1 39.5 41.8 1.31 1.38 1.50 -0.36 51.5 60.6 76.1 A
6/2/2016 48 45.3 49.2 55.4 39.2 41.1 44.0 1.27 1.31 1.37 -0.36 46.9 51.6 58.9 A
6/3/2016 48 42.9 50.9 67.6 38.4 41.9 47.6 1.27 1.35 1.45 -0.36 47.2 57.0 69.4 A
6/4/2016 48 39.8 46.4 54.5 37.7 40.1 43.6 1.20 1.26 1.37 -0.36 39.9 45.7 59.1 A
6/5/2016 48 43.3 48.4 57.3 39.0 41.0 45.3 1.19 1.22 1.25 -0.36 38.7 41.2 44.5 A
6/6/2016 48 43.1 52.9 67.7 38.6 42.5 48.5 1.13 1.19 1.26 -0.36 33.2 38.8 45.4 A
6/7/2016 48 42.9 53.1 75.3 39.0 43.2 50.8 1.12 1.18 1.24 -0.36 32.7 38.1 43.4 A
6/8/2016 48 44.4 48.0 52.2 39.4 41.3 43.5 1.11 1.16 1.22 -0.36 31.9 36.0 41.4 A
6/9/2016 48 44.6 48.7 53.4 39.8 41.1 43.5 1.22 1.34 1.50 -0.36 41.9 55.4 76.7 A
6/10/2016 48 42.9 46.0 51.5 38.8 41.0 44.2 1.15 1.19 1.24 -0.36 35.2 38.8 43.6A
6/11/2016 48 41.4 45.8 55.2 38.8 41.1 44.4 1.12 1.19 1.27 -0.36 33.0 39.1 46.6A
6/12/2016 48 38.8 48.2 58.0 38.4 41.3 45.5 1.12 1.15 1.20 -0.36 32.4 35.3 39.8A
6/13/2016 48 41.4 48.6 52.9 39.4 41.4 43.5 1.09 1.11 1.16 -0.36 30.0 31.9 36.4A
6/14/2016 48 37.9 48.0 55.5 38.4 42.2 45.5 1.04 1.07 1.11 -0.36 26.2 28.9 31.4A
6/15/2016 48 46.9 50.1 55.7 41.3 43.2 46.2 1.06 1.09 1.13 -0.36 28.1 30.3 33.3A
6/16/2016 48 47.4 52.5 60.0 41.8 43.7 48.2 1.11 1.30 1.46 -0.36 31.7 51.5 71.2A
6/17/2016 48 47.4 49.0 52.6 39.9 41.2 42.2 1.14 1.21 1.31 -0.36 34.6 40.9 51.4A
6/18/2016 48 46.4 49.4 56.2 40.7 42.6 46.4 1.12 1.36 1.55 -0.36 32.7 59.5 86 A
6/19/2016 48 45.3 51.1 59.9 39.8 42.4 46.5 1.19 1.26 1.36 -0.36 38.9 45.6 56.7A
6/20/2016 48 39.9 48.1 55.5 39.2 42.2 46.4 1.11 1.13 1.19 -0.36 31.4 33.6 38.4A
6/21/2016 48 43.5 49.3 55.2 40.7 43.5 47.1 1.07 1.12 1.18 -0.36 28.5 32.5 37.8A
6/22/2016 48 46.5 52.5 58.5 41.8 45.3 50.3 1.15 1.18 1.23 -0.36 34.8 38.1 42.4A
6/23/2016 48 46.5 50.8 57.6 41.1 43.6 47.4 1.11 1.16 1.24 -0.36 31.7 35.7 43.9A
6/24/2016 48 48.2 51.9 56.6 42.2 43.5 44.9 1.23 1.24 1.28 -0.36 42.3 43.9 47.4A
6/25/2016 48 46.4 51.3 58.3 41.4 43.9 48.3 1.17 1.22 1.27 -0.36 36.9 41.3 47.2A
6/26/2016 48 47.3 55.4 66.4 40.7 45.6 52.6 1.10 1.14 1.17 -0.36 31.1 34.3 37.0A
6/27/2016 48 39.2 51.6 61.9 40.5 46.2 54.3 1.03 1.06 1.11 -0.36 25.8 28.2 32.1A
6/28/2016 48 43.5 49.9 55.9 41.8 45.8 51.0 0.99 1.03 1.08 -0.36 23.3 25.9 29.1A
6/29/2016 48 49.8 52.7 56.6 44.2 45.5 47.3 1.04 1.05 1.06 -0.36 26.5 27.2 27.6A
6/30/2016 48 49.2 53.6 57.8 43.1 45.5 48.3 0.99 1.01 1.05 -0.36 22.9 24.4 26.9A
7/1/2016 48 44.0 55.8 65.9 41.4 47.0 54.3 0.92 0.95 1.00 -0.36 19.0 20.4 23.5 A
7/2/2016 48 47.6 51.5 55.0 43.6 45.4 47.1 0.87 0.90 0.93 -0.36 16.5 17.7 19.7 A
7/3/2016 48 49.2 52.5 56.9 43.8 45.7 47.6 0.85 0.87 0.89 -0.36 15.4 16.3 17.4 A
7/4/2016 48 49.2 52.1 56.8 44.0 45.6 47.4 0.84 0.86 0.91 -0.36 14.7 15.9 18.5 A
7/5/2016 48 47.6 50.3 53.6 43.8 45.5 47.4 0.84 0.89 0.97 -0.36 14.8 17.4 22.1 A
7/6/2016 48 48.2 53.3 60.4 44.0 47.1 54.1 0.85 0.88 0.90 -0.36 15.4 16.8 18.0 A
7/7/2016 48 47.1 51.4 58.3 43.6 46.6 50.6 0.83 0.86 0.90 -0.36 14.5 15.8 18.1 A
7/8/2016 48 49.2 53.6 61.2 44.9 46.8 49.4 0.83 0.85 0.89 -0.36 14.4 15.4 17.4 A
7/9/2016 48 48.7 52.7 58.5 44.6 46.9 51.5 0.83 0.86 0.90 -0.36 14.3 15.9 17.7 A
7/10/2016 48 46.4 53.6 63.5 44.0 47.0 50.5 0.82 0.84 0.87 -0.36 13.8 15.0 16.5A
7/11/2016 48 51.2 57.7 65.0 45.1 49.0 54.8 0.80 0.82 0.84 -0.36 13.1 13.8 14.8A
7/12/2016 48 53.3 56.5 59.2 45.3 47.9 51.0 0.77 0.80 0.84 -0.36 12.0 13.2 15.0A
7/13/2016 48 52.9 57.5 65.3 46.0 48.8 52.2 0.78 0.80 0.83 -0.36 12.3 13.1 14.2A
7/14/2016 48 53.1 55.7 57.4 47.1 48.5 49.8 0.77 0.81 0.85 -0.36 11.9 13.4 15.3A
7/15/2016 48 51.7 53.4 55.4 46.2 47.8 49.4 0.76 0.82 0.93 -0.36 11.5 14.0 19.2A
7/16/2016 48 51.0 53.2 55.4 46.4 47.2 48.2 0.80 0.85 0.95 -0.36 13.3 15.2 20.8A
7/17/2016 48 52.4 56.9 63.8 47.1 50.5 57.1 0.81 0.85 0.93 -0.36 13.6 15.5 19.3A
7/18/2016 48 47.3 55.1 60.0 46.2 49.6 52.8 0.77 0.79 0.81 -0.36 12.0 12.8 13.7A
7/19/2016 48 54.0 57.1 64.0 47.6 49.8 52.9 0.75 0.77 0.79 -0.36 11.0 11.9 12.7A
7/20/2016 48 56.6 59.5 63.3 49.2 50.8 53.1 0.75 0.77 0.80 -0.36 10.9 11.9 12.9A
7/21/2016 48 49.2 55.3 60.7 47.8 50.0 52.6 0.72 0.75 0.80 -0.36 10.2 11.2 13.0A
7/22/2016 48 52.6 55.4 61.9 48.7 50.2 52.9 0.73 0.76 0.78 -0.36 10.5 11.3 12.4A
7/23/2016 48 51.2 55.5 62.6 46.9 49.9 55.5 0.71 0.73 0.76 -0.36 9.7 10.5 11.5 A
7/24/2016 48 51.2 58.0 63.3 48.5 49.9 51.3 0.70 0.72 0.73 -0.36 9.5 9.9 10.4 A
7/25/2016 48 51.0 54.0 59.5 47.4 49.8 54.3 0.70 0.75 0.82 -0.36 9.4 11.3 14.0 A
7/26/2016 48 54.3 57.8 62.3 48.9 51.1 54.3 0.73 0.78 0.86 -0.36 10.5 12.5 15.6A
7/27/2016 48 51.5 56.9 65.3 48.5 50.4 52.9 0.71 0.72 0.74 -0.36 9.5 10.0 10.7 A
7/28/2016 48 49.2 55.6 65.0 47.4 50.1 53.8 0.67 0.69 0.71 -0.36 8.5 9.0 9.8 A
7/29/2016 48 45.6 55.7 64.3 46.2 51.0 57.8 0.65 0.67 0.69 -0.36 7.8 8.4 9.1 A
7/30/2016 48 46.5 55.8 66.4 46.7 50.8 56.2 0.64 0.65 0.67 -0.36 7.5 7.8 8.3 A
7/31/2016 48 52.1 54.0 56.6 48.7 49.7 51.0 0.65 0.69 0.74 -0.36 7.8 9.0 10.7 A
8/1/2016 48 49.2 54.9 63.3 46.5 49.8 54.8 0.65 0.67 0.72 -0.36 7.8 8.5 10.0 A
8/2/2016 48 45.6 53.5 62.9 46.5 49.9 55.4 0.63 0.64 0.67 -0.36 7.1 7.6 8.5 A
8/3/2016 48 54.3 55.7 58.1 49.9 50.7 52.1 0.67 0.71 0.80 -0.36 8.3 9.7 13.1 A
8/4/2016 48 54.5 57.2 60.7 49.2 51.8 57.3 0.64 0.66 0.69 -0.36 7.5 8.2 8.9 A
8/5/2016 48 53.3 56.0 59.5 50.1 51.5 52.9 0.63 0.80 1.00 -0.36 7.4 13.9 23.7 A
8/6/2016 48 49.8 55.1 60.7 48.5 50.6 53.1 0.72 0.75 0.80 -0.36 10.2 11.2 13.1 A
8/7/2016 48 49.1 54.2 60.0 47.8 49.5 51.3 0.69 0.72 0.75 -0.36 9.1 9.9 10.9 A
8/8/2016 48 47.3 54.8 63.5 46.2 48.6 50.5 0.68 0.69 0.70 -0.36 8.6 9.0 9.5 A
8/9/2016 48 47.3 54.6 63.3 46.2 49.4 53.8 0.65 0.67 0.69 -0.36 7.8 8.3 9.0 A
8/10/2016 48 49.9 52.9 56.9 48.0 49.2 50.3 0.66 0.70 0.75 -0.36 8.0 9.3 11.3 A
8/11/2016 48 49.2 56.4 65.9 47.4 50.6 55.5 0.66 0.68 0.72 -0.36 8.0 8.6 9.8 A
8/12/2016 48 52.1 54.4 57.1 48.9 49.3 50.8 0.65 0.66 0.68 -0.36 7.7 8.1 8.6 A
8/13/2016 48 49.6 53.5 56.8 47.6 49.4 51.2 0.66 0.81 0.98 -0.36 8.0 14.3 22.6 A
8/14/2016 48 52.4 53.8 56.8 49.6 50.1 50.6 0.86 1.27 1.58 -0.36 15.8 49.2 90 A
8/15/2016 48 53.1 56.5 62.8 48.3 50.3 53.8 0.99 1.06 1.14 -0.36 22.9 27.9 34.4A
8/16/2016 48 52.2 54.2 55.7 48.5 49.6 50.6 0.97 1.03 1.18 -0.36 21.7 26.2 38.3A
8/17/2016 48 52.2 56.8 65.5 48.9 50.4 52.9 0.97 1.04 1.17 -0.36 21.7 26.6 37.2A
8/18/2016 48 51.9 55.8 62.6 48.5 50.9 58.3 -0.38 0.90 0.99 -0.36 19.0 20.5 22.9 A
8/19/2016 48 52.4 56.3 64.3 48.7 50.5 53.4 0.91 0.96 1.08 -0.36 18.4 21.3 29.4A
8/20/2016 48 50.3 55.6 62.6 48.3 50.4 53.1 0.89 0.92 0.96 -0.36 17.5 19.1 21.1A
8/21/2016 48 52.6 59.8 73.8 49.2 51.4 55.0 0.88 0.89 0.92 -0.36 16.6 17.5 19.1A
8/22/2016 48 53.1 55.2 57.8 49.2 50.1 51.0 0.86 0.88 0.90 -0.36 15.9 16.6 17.6A
8/23/2016 48 52.6 54.1 56.4 48.5 49.3 49.9 0.85 0.89 0.96 -0.36 15.4 17.2 21.4A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 4 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
8/24/2016 48 48.3 55.4 61.2 47.6 50.0 52.6 0.85 0.87 0.92 -0.36 15.2 16.5 18.9A
8/25/2016 48 49.8 56.6 66.2 48.0 50.2 52.8 0.81 0.83 0.85 -0.36 13.7 14.5 15.3A
8/26/2016 48 50.5 57.7 67.4 48.3 50.9 55.4 0.79 0.81 0.82 -0.36 12.7 13.4 14.1A
8/27/2016 48 49.8 57.5 64.8 48.7 51.1 55.2 0.77 0.78 0.80 -0.36 11.8 12.4 13.1A
8/28/2016 48 52.8 60.7 70.5 49.9 52.5 57.4 0.73 0.76 0.78 -0.36 10.5 11.4 12.2A
8/29/2016 48 49.9 59.4 65.2 49.4 52.3 56.6 0.72 0.74 0.75 -0.36 9.9 10.6 11.3 A
8/30/2016 48 46.4 54.7 64.5 47.8 50.5 53.4 0.71 0.72 0.73 -0.36 9.7 10.1 10.5 A
8/31/2016 48 53.8 55.6 56.6 50.1 50.6 51.7 0.70 0.80 1.14 -0.36 9.5 14.0 34.4 A
9/1/2016 48 55.4 56.9 60.4 51.5 51.9 52.8 0.93 1.04 1.16 -0.36 19.6 27.0 36.4 A
9/2/2016 48 55.9 57.0 58.6 51.5 52.2 53.6 0.95 1.02 1.18 -0.36 20.6 25.1 37.5 A
9/3/2016 48 48.9 56.0 61.2 49.6 51.7 53.6 1.04 1.14 1.38 -0.36 26.8 35.0 59.7 A
9/4/2016 48 50.6 55.8 59.9 49.9 50.8 52.6 1.02 1.09 1.17 -0.36 25.1 30.6 37.1 A
9/5/2016 48 46.4 54.0 64.0 47.3 49.3 51.7 0.99 1.03 1.09 -0.36 23.2 26.0 30.0 A
9/6/2016 48 51.7 56.2 66.2 47.6 49.1 51.7 0.95 0.98 1.00 -0.36 20.7 22.3 24.0 A
9/7/2016 48 47.6 52.1 56.9 47.1 48.3 50.1 0.91 0.94 0.96 -0.36 18.5 19.9 21.4 A
9/8/2016 48 45.3 53.1 63.5 45.6 47.8 51.3 0.88 0.89 0.92 -0.36 16.7 17.5 18.8 A
9/9/2016 48 44.2 52.9 63.5 45.8 47.4 49.8 0.84 0.86 0.89 -0.36 15.1 15.7 17.1 A
9/10/2016 48 47.3 53.0 58.1 46.9 48.6 52.2 0.83 1.42 2.51 -0.36 14.6 105 393 A:e
9/11/2016 48 54.3 55.3 56.2 49.2 50.0 51.3 1.44 1.74 2.05 -0.36 68.0 126 202 A:e
9/12/2016 48 49.1 52.8 55.4 47.6 48.6 49.9 1.36 1.51 1.70 -0.36 57.2 78.7 113 A:e
9/13/2016 48 48.0 51.7 56.1 46.5 47.2 48.2 1.24 1.34 1.67 -0.36 44.1 55.8 107 A:e
9/14/2016 48 49.9 52.6 57.6 47.6 48.1 48.7 1.34 1.41 1.57 -0.36 55.4 64.1 88 A
9/15/2016 48 49.1 52.4 57.1 46.9 47.5 48.3 1.26 1.32 1.39 -0.36 45.8 52.8 60.6A
9/16/2016 48 44.9 49.8 56.8 45.3 47.3 48.2 1.24 1.31 1.41 -0.36 43.9 51.7 64.3A
9/17/2016 48 42.5 46.6 52.1 43.5 44.5 45.3 1.24 1.28 1.42 -0.36 43.3 48.6 65.6A
9/18/2016 48 44.6 51.9 61.2 44.2 45.6 47.8 1.16 1.20 1.25 -0.36 36.3 40.2 45.2A
9/19/2016 48 49.4 52.2 53.8 45.5 46.9 49.2 1.14 1.53 2.36 -0.36 34.1 106 321 A:e
9/20/2016 48 41.3 50.8 63.3 44.6 45.9 47.8 1.36 1.49 1.74 -0.36 57.3 76.4 120 A:e
9/21/2016 48 37.3 47.1 61.7 42.4 44.0 46.2 1.24 1.28 1.35 -0.36 43.3 48.3 55.5A
9/22/2016 48 41.8 48.7 58.5 43.5 44.7 47.1 1.15 1.19 1.24 -0.36 34.8 38.6 43.9A
9/23/2016 48 42.0 48.1 62.6 42.9 44.3 46.0 1.08 1.12 1.15 -0.36 29.8 32.4 35.1A
9/24/2016 48 44.6 48.7 58.5 44.0 45.0 47.4 1.03 1.06 1.09 -0.36 26.0 28.2 30.2A
9/25/2016 48 37.5 47.3 57.8 42.7 44.4 46.4 0.97 1.01 1.04 -0.36 22.1 24.2 26.4A
9/26/2016 48 44.2 48.7 52.2 44.2 45.0 46.5 0.97 1.00 1.06 -0.36 22.1 23.8 27.7A
9/27/2016 48 43.5 50.1 54.3 44.0 45.3 46.5 0.93 0.96 0.99 -0.36 19.6 21.1 23.1A
9/28/2016 48 41.6 48.7 57.3 43.6 45.4 48.2 0.90 0.92 0.94 -0.36 17.8 19.0 20.3A
9/29/2016 48 50.3 51.9 55.0 45.1 46.2 47.6 0.87 0.98 1.99 -0.36 16.3 28.2 184 A:e
9/30/2016 48 51.3 53.3 55.9 47.4 49.0 50.8 1.53 1.94 2.75 -0.36 82 186 528 A:e
10/1/2016 48 45.5 49.3 51.7 43.8 46.2 48.2 1.48 1.72 2.12 -0.36 73.6 122 225 A:e
10/2/2016 48 42.2 51.9 61.7 44.0 45.2 46.9 1.29 1.37 1.47 -0.36 49.3 59.0 72.2A
10/3/2016 48 39.6 48.4 61.1 42.4 44.3 46.9 1.18 1.23 1.29 -0.36 38.3 42.7 48.8A
10/4/2016 48 47.1 49.5 52.8 44.6 45.0 45.8 1.12 1.16 1.19 -0.36 32.9 35.7 38.3A
10/5/2016 48 49.2 51.0 53.4 44.2 45.4 47.1 1.08 1.10 1.17 -0.36 29.1 31.4 36.6A
10/6/2016 48 51.0 51.9 52.8 47.1 47.7 48.2 1.12 1.18 1.24 -0.36 33.0 37.6 43.3A
10/7/2016 48 47.8 50.8 52.4 46.4 48.0 48.9 1.17 1.41 1.87 -0.36 36.9 67.3 153 A:e
10/8/2016 48 45.6 51.2 59.5 44.6 46.7 47.6 1.51 1.87 2.36 -0.36 79.0 163 319 A:e
10/9/2016 48 43.3 48.4 52.8 43.1 44.5 45.8 1.29 1.38 1.51 -0.36 48.5 60.5 78.4A
10/10/2016 48 44.9 49.2 52.4 44.4 45.7 47.3 1.26 1.38 1.70 -0.36 45.3 61.5 113 A:e
10/11/2016 48 48.3 50.5 53.8 45.8 46.3 47.3 1.30 1.36 1.45 -0.36 50.2 57.2 69.5 A
10/12/2016 48 46.7 50.0 59.2 44.9 45.9 47.6 1.24 1.28 1.38 -0.36 44.2 48.5 59.7 A
10/13/2016 48 42.7 49.0 57.3 44.4 45.5 46.9 1.17 1.21 1.26 -0.36 36.8 41.0 45.9 A
10/14/2016 48 39.8 45.7 52.4 42.7 44.2 45.8 1.13 1.15 1.18 -0.36 33.9 35.6 37.5 A
10/15/2016 48 44.6 46.9 53.8 43.5 44.4 46.2 1.17 1.20 1.25 -0.36 36.7 39.7 44.6 A
10/16/2016 48 42.4 45.4 49.6 41.8 43.4 44.7 1.14 1.19 1.26 -0.36 34.1 38.4 45.3 A
10/17/2016 48 32.0 37.9 42.5 38.4 40.1 41.6 1.08 1.11 1.14 -0.36 29.1 31.8 34.2 A
10/18/2016 48 32.0 34.7 39.0 37.1 37.9 38.8 1.04 1.07 1.08 -0.36 26.4 28.6 29.7 A
10/19/2016 48 36.5 43.2 46.7 37.3 40.0 42.2 1.06 1.31 1.56 -0.36 27.7 52.5 87 A
10/20/2016 48 39.2 42.1 46.5 40.5 41.3 42.5 1.14 1.17 1.22 -0.36 34.4 37.4 41.7 A
10/21/2016 48 38.8 41.2 45.5 39.6 40.5 42.0 1.08 1.11 1.14 -0.36 29.6 31.5 33.9 A
10/22/2016 48 34.2 42.1 51.5 38.6 39.9 41.3 1.04 1.06 1.09 -0.36 26.6 28.2 30.0 A
10/23/2016 48 41.6 45.6 48.0 39.6 41.7 43.6 1.03 1.09 1.25 -0.36 25.4 31.0 44.3 A
10/24/2016 48 44.2 48.3 58.8 41.6 42.6 44.0 1.04 1.07 1.11 -0.36 26.3 28.4 32.2 A
10/25/2016 48 42.5 46.8 49.4 41.6 43.3 44.9 1.03 1.21 1.65 -0.36 26.0 43.2 104 A:e
10/26/2016 48 41.3 45.1 50.5 41.1 41.8 43.3 1.10 1.13 1.17 -0.36 30.6 33.5 36.7 A
10/27/2016 48 36.0 44.7 53.1 39.2 40.9 43.3 1.06 1.10 1.16 -0.36 28.1 30.9 36.0 A
10/28/2016 48 38.8 47.8 51.7 41.3 44.3 46.4 1.06 1.67 3.00 -0.49 28.2 206 719 A:e
10/29/2016 48 36.0 43.6 52.6 40.7 41.2 42.4 0.89 1.13 1.46 -0.66 38.8 68.9 125 A:e
10/30/2016 48 40.3 43.0 45.3 40.3 41.2 42.0 0.90 1.06 1.29 -0.66 39.6 57.9 92 A
10/31/2016 48 35.6 42.1 54.7 39.8 40.8 42.0 0.81 0.90 1.07 -0.66 31.6 40.5 58.2 A
11/1/2016 48 36.9 40.0 42.5 39.4 40.4 41.1 0.76 0.82 0.90 -0.66 27.8 32.8 40.0A
11/2/2016 48 33.6 40.0 51.9 38.3 39.0 39.8 0.66 0.73 0.79 -0.66 21.5 26.0 30.5A
11/3/2016 48 32.6 37.2 41.3 37.3 38.1 39.0 0.65 0.69 0.73 -0.66 20.6 23.1 26.0A
11/4/2016 48 30.2 37.3 48.9 37.1 37.9 39.0 0.59 0.63 0.67 -0.66 17.1 19.6 21.9A
11/5/2016 48 30.4 37.0 52.2 37.3 38.2 39.6 0.55 0.58 0.60 -0.66 15.4 16.6 18.0A
11/6/2016 48 34.6 38.3 43.6 37.3 38.4 39.2 0.52 0.55 0.58 -0.66 14.0 15.3 16.9A
11/7/2016 48 34.0 36.7 39.4 37.3 38.0 38.8 0.49 0.52 0.55 -0.66 12.9 14.0 15.4A
11/8/2016 48 39.4 40.9 43.6 38.3 38.7 39.4 0.58 0.75 0.86 -0.66 16.8 27.3 35.8A
11/9/2016 48 40.3 42.5 45.1 39.4 40.0 40.9 0.65 0.71 0.75 -0.66 20.8 24.2 27.0A
11/10/2016 48 34.4 36.0 39.9 37.1 37.9 39.9 0.68 0.70 0.73 -0.66 22.4 23.6 25.6 A
11/11/2016 48 33.0 35.2 40.9 36.9 37.4 38.6 0.58 0.64 0.69 -0.66 17.0 19.9 23.3 A
11/12/2016 48 33.4 36.4 39.8 36.7 37.2 37.9 0.57 0.66 0.82 -0.66 16.2 21.6 32.5 A
11/13/2016 48 36.7 41.4 44.4 37.7 39.0 40.5 0.64 0.69 0.76 -0.66 20.2 22.9 28.2 A
11/14/2016 48 32.6 34.6 36.5 34.8 36.0 38.3 0.59 0.65 0.73 -0.66 17.4 21.0 25.6 A
11/15/2016 48 31.8 35.7 44.2 35.6 36.6 37.5 0.53 0.57 0.62 -0.66 14.5 16.4 18.9 A
11/16/2016 48 31.4 34.4 40.7 36.1 36.5 37.3 0.51 0.54 0.57 -0.66 13.6 14.7 16.4 A
11/17/2016 48 30.4 36.1 42.0 36.3 37.4 38.8 0.48 0.50 0.52 -0.66 12.1 13.0 14.1 A
11/18/2016 48 36.5 39.7 42.0 37.5 38.3 39.0 0.48 0.53 0.57 -0.66 12.4 14.3 16.5 A
11/19/2016 48 31.4 34.7 37.5 37.1 37.7 38.1 0.46 0.49 0.52 -0.66 11.4 12.7 13.9 A
11/20/2016 48 34.2 36.0 37.9 36.9 37.7 38.1 0.44 0.47 0.53 -0.66 10.9 12.0 14.2 A
11/21/2016 48 29.8 35.6 39.2 36.5 36.9 37.9 0.39 0.43 0.47 -0.66 9.2 10.2 11.8A:e
11/22/2016 48 33.8 36.4 40.7 36.0 36.6 37.5 0.38 0.51 0.67 -0.66 8.8 14.0 22.0A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 5 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
11/23/2016 48 35.2 38.4 44.4 36.3 37.2 38.1 0.41 0.44 0.48 -0.66 9.6 10.7 12.2A
11/24/2016 48 31.8 38.3 43.5 36.5 37.6 39.2 0.37 0.41 0.48 -0.66 8.5 9.8 12.3 A
11/25/2016 48 35.4 38.2 41.3 36.9 37.7 38.6 0.37 0.41 0.46 -0.66 8.5 9.7 11.4 A
11/26/2016 48 35.6 40.7 45.8 35.6 37.2 38.4 0.46 0.75 0.90 -0.85 11.4 46.5 68.9 A
11/27/2016 48 34.6 37.1 40.1 35.8 36.4 37.7 0.57 0.63 0.73 -0.91 32.7 38.4 47.8 A
11/28/2016 48 32.4 37.5 49.2 36.1 36.8 37.5 0.53 0.56 0.60 -0.91 29.2 31.9 35.3 A
11/29/2016 48 31.8 35.0 38.4 35.8 37.0 38.3 0.51 0.53 0.56 -0.91 27.6 29.4 32.0 A
11/30/2016 48 32.2 35.3 39.9 35.4 37.0 38.6 0.51 0.55 0.61 -0.91 27.8 31.1 35.7 A
12/1/2016 48 25.8 27.9 32.0 34.0 34.8 36.0 0.44 0.50 0.56 -0.91 22.8 26.9 31.4A
12/2/2016 48 26.7 30.8 35.6 33.0 34.8 35.8 0.42 0.45 0.50 -0.91 22.0 24.0 27.0A
12/3/2016 48 28.3 33.3 38.8 35.0 36.0 37.1 0.37 0.41 0.44 -0.91 18.7 21.5 23.3A
12/4/2016 48 30.8 36.8 39.2 36.1 37.3 38.1 0.37 0.42 0.58 -0.91 18.9 22.1 33.8A
12/5/2016 48 34.4 37.4 41.8 35.4 36.3 37.1 0.50 0.61 0.73 -0.91 27.3 36.1 48.1A
12/6/2016 48 27.5 33.8 37.1 34.6 36.2 36.7 0.43 0.48 0.53 -0.91 22.3 25.7 29.4A
12/7/2016 48 24.7 26.6 29.4 33.2 34.0 34.6 0.38 0.41 0.44 -0.91 19.5 21.4 22.9A
12/8/2016 48 25.2 26.6 28.3 33.4 34.3 35.2 0.34 0.37 0.41 -0.91 17.4 19.0 21.1A
12/9/2016 48 24.7 28.0 31.2 33.6 34.5 35.2 0.32 0.34 0.37 -0.91 16.3 17.5 18.7A
12/10/2016 48 25.0 31.5 45.1 34.8 35.6 36.9 0.31 0.33 0.37 -0.91 15.6 16.7 18.7 A
12/11/2016 48 23.4 32.2 41.3 34.8 36.0 36.9 0.28 0.30 0.33 -0.91 14.6 15.5 16.7 A
12/12/2016 48 36.9 39.8 46.4 34.2 36.1 37.3 0.30 0.55 0.76 -0.91 15.3 33.0 51.9 A
12/13/2016 48 39.0 41.3 42.2 35.2 36.4 37.1 0.56 0.89 1.60 -0.91 32.0 76.7 237 A:e
12/14/2016 48 38.4 40.8 46.9 35.2 36.2 37.5 0.75 1.09 1.87 -0.91 50.6 114 349 A:e
12/15/2016 48 36.1 39.3 40.9 35.0 36.9 37.5 0.68 0.74 0.98 -0.91 42.7 49.6 82 A
12/16/2016 48 31.8 38.2 41.8 36.0 36.4 36.5 0.69 0.85 1.25 -0.91 43.6 64.7 135 A:e
12/17/2016 48 28.1 34.0 39.4 35.2 36.0 37.1 0.62 0.67 0.71 -0.91 36.9 41.6 45.5 A
12/18/2016 48 35.8 38.0 39.8 36.0 36.9 37.7 0.55 0.60 0.70 -0.91 31.0 35.4 44.5 A
12/19/2016 48 34.2 37.8 41.4 36.7 37.2 38.1 0.49 0.53 0.59 -0.91 26.3 29.4 34.3 A
12/20/2016 48 29.6 32.8 38.1 34.8 36.3 37.5 0.43 0.47 0.52 -0.91 22.8 25.1 28.3 A
12/21/2016 48 24.7 30.7 37.5 35.0 35.6 36.7 0.36 0.41 0.44 -0.91 18.6 21.4 23.4 A
12/22/2016 48 24.7 30.2 42.7 35.0 35.5 36.3 0.31 0.35 0.38 -0.91 15.9 18.0 19.8 A
12/23/2016 48 26.7 35.9 39.4 35.0 36.1 36.9 0.30 0.36 0.52 -0.91 15.4 18.8 28.9 A
12/24/2016 48 33.2 38.4 40.9 35.2 36.4 37.3 0.54 0.66 0.76 -0.91 29.8 41.3 50.9 A
12/25/2016 48 35.0 38.2 49.4 35.8 36.3 36.9 0.45 0.53 0.64 -0.91 23.6 29.4 39.1 A
12/26/2016 48 28.8 34.4 37.5 34.2 35.4 36.1 0.38 0.42 0.45 -0.91 19.6 22.2 24.0 A
12/27/2016 48 30.8 35.2 39.4 34.8 36.2 36.9 0.36 0.40 0.44 -0.91 18.4 20.7 22.9 A
12/28/2016 48 30.6 33.9 39.0 34.8 35.9 37.1 0.31 0.35 0.39 -0.91 15.6 17.7 20.2 A
12/29/2016 48 36.5 41.9 46.0 36.1 37.5 39.2 0.30 0.42 0.63 -0.91 15.1 22.9 37.6 A
12/30/2016 48 30.8 38.0 46.7 35.4 35.8 36.3 0.35 0.42 0.53 -0.91 18.0 22.1 29.5 A
12/31/2016 48 39.0 40.1 41.3 36.1 37.0 37.9 0.37 0.69 1.07 -0.91 18.7 50.6 97 A:e
1/1/2017 48 39.0 40.5 41.3 36.3 36.9 37.3 0.86 1.04 1.42 -0.91 63.2 96 178 A:e
1/2/2017 48 39.2 40.6 41.6 36.9 37.3 37.5 1.10 1.23 1.47 -0.91 102 131 193 A:e
1/3/2017 48 39.0 40.9 41.8 37.3 37.8 38.1 0.94 1.12 1.25 -0.91 75.6 108 135 A:e
1/4/2017 48 35.6 37.8 39.4 36.9 37.8 38.6 0.80 0.90 1.03 -0.91 56.5 69.2 90 A
1/5/2017 48 29.6 34.7 46.0 36.1 36.5 36.9 0.68 0.74 0.82 -0.91 42.6 48.8 58.7 A
1/6/2017 48 26.5 33.2 50.3 34.8 35.4 36.1 0.58 0.65 0.71 -0.91 33.7 39.4 46.2 A
1/7/2017 48 22.3 30.3 51.3 34.4 34.7 35.4 0.48 0.55 0.61 -0.91 25.4 31.0 35.9 A
1/8/2017 48 29.0 35.2 38.4 34.6 35.8 36.9 0.44 0.47 0.51 -0.91 22.9 25.4 28.2 A
1/9/2017 48 22.3 30.2 44.9 34.2 34.7 35.8 0.38 0.42 0.46 -0.91 19.5 21.6 24.5 A
1/10/2017 48 25.4 32.7 47.4 33.8 34.3 35.2 0.33 0.37 0.41 -0.91 16.7 18.7 21.0A
1/11/2017 48 24.7 31.5 40.1 34.0 34.9 35.6 0.28 0.33 0.37 -0.91 14.5 16.6 18.9A
1/12/2017 48 21.9 28.7 38.3 33.6 34.4 34.8 0.25 0.28 0.32 -0.91 13.1 14.4 16.3A
1/13/2017 48 19.4 25.1 31.0 32.6 33.6 34.6 0.18 0.23 0.29 -0.91 10.3 12.3 14.7A
1/14/2017 48 15.6 21.3 34.8 32.6 33.2 34.2 0.16 0.19 0.22 -0.91 9.7 10.8 11.8 A
1/15/2017 48 15.1 21.4 26.0 32.6 33.3 34.0 0.15 0.17 0.19 -0.91 9.3 10.0 10.8 A
1/16/2017 48 13.1 23.5 37.5 32.8 33.5 34.4 0.13 0.16 0.18 -0.91 8.6 9.6 10.3 A
1/17/2017 48 18.0 19.2 21.7 33.4 33.5 34.0 0.12 0.14 0.16 -0.91 8.5 9.1 9.7 A
1/18/2017 48 11.8 21.3 28.6 33.0 33.9 35.0 0.10 0.12 0.15 -0.91 7.7 8.5 9.4 A
1/19/2017 48 26.2 31.8 46.7 33.4 34.4 34.6 0.09 0.11 0.13 -0.91 7.4 8.0 8.7 A
1/20/2017 48 17.7 21.5 27.9 32.8 33.6 34.4 0.07 0.09 0.11 -0.91 7.0 7.5 8.1 A
1/21/2017 48 13.6 20.9 32.2 33.0 33.6 34.2 0.04 0.07 0.08 -0.91 6.2 6.9 7.3 A
1/22/2017 48 22.8 27.5 31.8 31.8 33.1 34.4 0.05 0.07 0.09 -0.91 6.3 6.9 7.5 A:e
1/23/2017 48 32.4 36.7 38.4 31.8 34.0 35.0 0.09 0.15 0.22 -0.91 7.5 9.2 11.9 A:e
1/24/2017 48 31.6 34.8 42.5 35.0 35.7 36.5 0.09 0.13 0.18 -0.91 7.5 8.6 10.4 A
1/25/2017 48 30.4 32.6 34.0 32.6 35.1 35.8 0.06 0.08 0.10 -0.91 6.8 7.3 7.9 A
1/26/2017 48 25.2 27.5 30.0 32.6 33.1 33.6 0.04 0.06 0.09 -0.91 6.1 6.8 7.5 A:e
1/27/2017 48 21.0 26.0 33.2 32.6 33.6 34.6 0.02 0.04 0.06 -0.91 5.8 6.1 6.6 A
1/28/2017 48 -6.0 28.7 51.7 33.4 34.6 36.0 0.01 0.02 0.04 -0.91 5.4 5.8 6.1 A:e
1/29/2017 48 20.5 31.7 37.7 33.2 34.8 36.1 0.00 0.03 0.18 -0.91 5.2 5.9 10.3 A
1/30/2017 48 29.8 36.4 42.5 33.2 34.5 35.6 0.20 0.36 0.58 -0.91 11.1 19.3 33.4A
1/31/2017 48 26.0 36.3 49.9 34.2 35.1 36.1 0.10 0.15 0.21 -0.91 7.9 9.3 11.6 A
2/1/2017 48 25.8 34.6 39.0 34.0 35.3 36.7 0.06 0.08 0.11 -0.91 6.7 7.3 8.0 A
2/2/2017 48 34.8 36.1 37.3 35.6 36.0 36.7 0.04 0.06 0.08 -0.91 6.3 6.8 7.2 A
2/3/2017 48 35.6 37.0 38.3 36.1 36.3 36.9 0.07 0.10 0.13 -0.91 6.9 7.9 8.6 A
2/4/2017 48 34.8 35.9 37.1 36.0 36.3 37.1 0.07 0.09 0.11 -0.91 6.9 7.5 8.2 A
2/5/2017 48 32.2 35.1 37.1 35.8 36.4 37.7 0.04 0.06 0.09 -0.91 6.2 6.8 7.4 A
2/6/2017 48 26.5 33.0 46.0 34.2 35.2 36.1 0.02 0.04 0.06 -0.91 5.7 6.2 6.8 A
2/7/2017 48 30.4 33.4 37.9 34.8 35.9 37.3 0.01 0.03 0.05 -0.91 5.5 6.0 6.4 A
2/8/2017 48 31.6 34.9 41.6 35.8 36.4 37.7 0.01 0.03 0.04 -0.91 5.6 5.9 6.2 A
2/9/2017 48 23.9 26.9 30.8 34.0 34.6 35.6 0.00 0.01 0.03 -0.91 5.2 5.6 6.1 A
2/10/2017 48 16.1 19.7 23.9 31.8 32.8 33.8 -0.03 -0.01 0.02 -0.91 4.7 5.1 5.7 A
2/11/2017 48 16.1 19.3 22.1 32.0 32.7 33.6 -0.03 -0.02 -0.01 -0.91 4.6 4.8 5.2A
2/12/2017 48 15.8 19.0 19.8 32.0 32.7 33.0 -0.04 -0.02 -0.01 -0.91 4.5 4.8 5.1A
2/13/2017 48 16.8 18.9 22.8 31.8 32.2 32.8 -0.04 -0.02 -0.01 -0.91 4.5 4.8 5.1A:e
2/14/2017 48 19.2 24.1 32.6 32.8 33.8 35.0 -0.05 -0.04 -0.01 -0.91 4.2 4.5 5.0A
2/15/2017 48 23.9 28.2 35.2 33.2 34.1 35.4 -0.06 -0.04 -0.02 -0.91 4.2 4.5 4.8A
2/16/2017 48 27.3 29.0 33.0 33.8 34.4 35.8 -0.06 -0.05 -0.03 -0.91 4.0 4.3 4.6A
2/17/2017 48 19.2 27.7 37.3 33.6 34.5 35.6 -0.07 -0.05 -0.04 -0.91 3.9 4.2 4.5A
2/18/2017 48 17.7 22.1 24.7 32.8 34.1 35.2 -0.08 -0.06 -0.05 -0.91 3.7 4.1 4.3A
2/19/2017 48 17.0 18.6 23.4 32.0 32.8 34.0 -0.08 -0.07 -0.05 -0.91 3.7 3.9 4.3A
2/20/2017 48 8.9 20.1 31.8 31.8 32.9 34.2 -0.09 -0.03 0.28 -0.91 3.6 5.1 14.3 A
2/21/2017 48 31.2 37.1 45.6 31.8 33.3 35.2 -0.09 0.11 0.25 -0.91 3.6 8.5 12.9 A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 6 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
2/22/2017 48 36.3 40.2 46.9 33.8 35.5 37.1 0.06 0.14 0.32 -0.91 6.6 9.4 16.3 A
2/23/2017 48 36.1 39.2 43.3 32.6 34.1 35.6 0.21 0.68 1.21 -0.91 11.5 50.3 125 A:e
2/24/2017 48 28.8 36.8 53.3 33.8 35.1 37.7 0.31 0.40 0.59 -0.91 15.9 20.9 34.6A
2/25/2017 48 29.6 37.6 46.5 34.0 35.2 37.3 0.21 0.25 0.30 -0.91 11.4 13.1 15.4A
2/26/2017 48 29.8 35.3 42.9 34.4 35.8 38.3 0.16 0.19 0.22 -0.91 9.8 10.7 11.9 A
2/27/2017 48 30.4 34.7 40.9 34.6 36.0 38.3 0.13 0.16 0.19 -0.91 8.8 9.7 10.6 A
2/28/2017 48 19.2 26.6 31.2 32.2 33.8 34.6 0.09 0.13 0.16 -0.91 7.4 8.7 9.5 A
3/1/2017 48 19.4 22.1 24.5 32.2 33.0 34.8 0.06 0.09 0.12 -0.91 6.7 7.5 8.4 A
3/2/2017 48 22.8 25.4 27.9 32.0 32.9 34.6 0.05 0.07 0.09 -0.91 6.5 7.0 7.5 A
3/3/2017 48 23.4 29.9 39.2 32.8 33.9 36.1 0.04 0.06 0.10 -0.91 6.1 6.7 7.7 A
3/4/2017 48 22.3 31.0 38.8 33.0 34.8 37.1 0.04 0.05 0.06 -0.91 6.1 6.3 6.6 A
3/5/2017 48 32.4 36.0 41.8 34.8 36.0 38.3 0.02 0.04 0.05 -0.91 5.8 6.1 6.5 A
3/6/2017 48 26.5 34.5 44.0 34.8 36.1 38.4 0.01 0.03 0.05 -0.91 5.5 6.0 6.4 A
3/7/2017 48 19.6 29.8 42.5 33.0 34.6 37.1 -0.01 0.02 0.05 -0.91 5.0 5.6 6.4 A
3/8/2017 48 23.4 31.6 44.9 32.8 34.3 37.3 -0.02 0.01 0.04 -0.91 4.9 5.4 6.2 A
3/9/2017 48 18.2 28.9 52.9 32.4 33.9 36.9 -0.39 0.00 0.05 -0.91 4.4 5.4 6.4 A
3/10/2017 48 17.7 28.2 37.3 32.4 33.9 36.9 -0.01 0.01 0.04 -0.91 5.0 5.5 6.1 A
3/11/2017 48 27.3 31.4 39.0 33.0 34.5 37.5 -0.02 0.01 0.04 -0.91 4.9 5.5 6.1 A
3/12/2017 48 26.7 29.5 35.4 32.2 34.0 36.7 -0.02 0.00 0.03 -0.91 4.9 5.4 5.9 A
3/13/2017 48 27.1 30.2 35.0 32.4 34.2 37.3 -0.04 0.00 0.02 -0.91 4.5 5.2 5.6 A
3/14/2017 48 25.6 28.9 35.0 32.4 33.9 37.5 -0.03 -0.01 0.02 -0.91 4.7 5.1 5.6 A
3/15/2017 48 20.5 23.9 27.7 31.8 33.1 35.4 -0.05 -0.02 0.00 -0.91 4.2 4.9 5.3 A
3/16/2017 48 21.0 24.5 31.4 31.8 32.9 36.0 -0.04 -0.02 -0.01 -0.91 4.5 4.8 5.1A:e
3/17/2017 48 19.2 27.2 39.0 32.0 33.6 36.9 -0.05 -0.02 0.00 -0.91 4.3 4.8 5.2 A
3/18/2017 48 23.7 28.7 41.3 32.4 33.9 36.7 -0.05 -0.03 -0.01 -0.91 4.2 4.7 5.1A
3/19/2017 48 24.1 29.0 39.4 32.4 34.1 37.9 -0.05 -0.03 0.00 -0.91 4.2 4.6 5.3 A
3/20/2017 48 21.7 26.7 36.9 32.0 33.9 37.5 -0.06 -0.03 -0.01 -0.91 4.1 4.6 5.1A
3/21/2017 48 20.3 27.8 36.1 32.2 34.1 37.9 -0.06 -0.03 0.00 -0.91 4.1 4.6 5.2 A
3/22/2017 48 18.7 28.4 41.6 31.8 33.9 37.7 -0.07 -0.03 0.00 -0.91 3.8 4.6 5.3 A
3/23/2017 48 24.1 32.2 43.3 32.0 34.3 38.6 -0.05 -0.03 0.01 -0.91 4.2 4.8 5.5 A
3/24/2017 48 19.4 29.4 37.1 32.2 34.3 37.1 -0.06 -0.03 0.01 -0.91 4.0 4.6 5.5 A
3/25/2017 48 28.1 34.3 38.4 34.6 35.7 38.8 -0.07 -0.05 -0.02 -0.91 3.8 4.3 4.9A
3/26/2017 48 31.4 33.9 36.1 34.6 35.2 36.3 -0.07 -0.05 -0.03 -0.91 3.8 4.2 4.6A
3/27/2017 48 26.9 32.4 39.9 33.4 36.0 40.1 -0.08 -0.05 -0.01 -0.91 3.7 4.3 5.1A
3/28/2017 48 24.5 30.8 37.9 33.6 35.7 39.9 -0.08 -0.04 -0.01 -0.91 3.7 4.4 5.1A
3/29/2017 48 17.5 28.7 37.3 32.2 34.8 39.0 -0.09 -0.04 0.00 -0.91 3.6 4.4 5.3 A
3/30/2017 48 29.2 30.6 34.2 32.0 34.2 35.4 -0.05 -0.03 0.00 -0.91 4.3 4.7 5.2 A:e
3/31/2017 48 25.2 26.9 29.2 31.8 32.3 34.4 -0.08 -0.04 -0.02 -0.91 3.7 4.5 4.8A:e
4/1/2017 48 26.7 30.6 36.7 32.2 34.0 37.3 -0.08 -0.06 -0.05 -0.91 3.7 4.0 4.3 A
4/2/2017 48 17.3 31.1 42.0 32.4 35.2 39.9 -0.09 -0.07 -0.03 -0.91 3.6 4.0 4.7 A
4/3/2017 48 26.7 27.1 27.7 32.6 33.5 34.6 -0.08 -0.06 -0.03 -0.91 3.7 4.1 4.6 A
4/4/2017 48 26.0 28.2 30.6 31.8 33.1 35.8 -0.08 -0.06 -0.04 -0.91 3.8 4.1 4.5 A
4/5/2017 48 25.4 27.4 30.4 31.8 32.7 36.0 -0.09 -0.07 -0.04 -0.91 3.5 3.9 4.5 A:e
4/6/2017 48 27.5 29.1 31.6 32.0 33.7 36.5 -0.10 -0.08 -0.06 -0.91 3.4 3.7 4.2 A
4/7/2017 48 27.1 29.7 33.0 32.8 34.2 36.7 -0.12 -0.09 -0.07 -0.91 3.0 3.5 3.9 A
4/8/2017 48 29.4 35.8 42.0 33.6 36.1 41.6 -0.13 -0.09 -0.01 -0.91 3.0 3.6 5.0 A
4/9/2017 48 29.6 33.3 38.1 34.2 35.3 37.3 -0.10 -0.08 -0.04 -0.91 3.5 3.8 4.5 A
4/10/2017 48 31.2 40.0 49.8 34.4 37.5 43.3 -0.12 -0.07 0.01 -0.91 3.1 3.9 5.6 A
4/11/2017 48 36.5 37.7 39.2 35.6 36.6 38.3 -0.05 0.02 0.14 -0.91 4.3 5.8 9.0 A
4/12/2017 48 36.3 37.1 37.9 33.4 35.2 36.1 0.10 0.26 0.87 -0.91 7.9 16.8 65.8 A
4/13/2017 48 36.9 38.8 43.6 33.0 34.6 37.3 0.59 0.79 1.18 -1.00 43.9 68.8 143 A:e
4/14/2017 48 32.0 37.5 41.8 33.8 35.9 38.8 0.35 0.44 0.57 -1.01 24.0 30.4 41.7A
4/15/2017 48 34.2 35.6 38.1 34.6 35.4 36.1 0.39 0.43 0.49 -1.01 26.8 29.7 34.2A
4/16/2017 48 34.2 36.3 38.3 34.8 35.7 36.7 0.40 0.45 0.54 -1.01 27.3 31.4 39.2A
4/17/2017 48 36.3 38.2 41.4 35.4 36.3 38.8 0.45 0.55 0.60 -1.01 31.2 39.4 45.2A
4/18/2017 48 32.6 36.2 40.7 34.4 36.9 41.3 0.40 0.46 0.57 -1.01 26.9 32.2 41.8A
4/19/2017 48 32.2 36.6 45.3 35.0 37.4 42.5 0.34 0.40 0.46 -1.01 23.2 27.6 31.5A
4/20/2017 48 30.6 34.3 42.7 35.2 36.7 39.4 0.29 0.34 0.42 -1.01 20.0 23.5 28.5A
4/21/2017 48 29.4 36.7 43.3 34.8 36.9 39.6 0.26 0.29 0.35 -1.01 18.3 20.1 23.7A
4/22/2017 48 38.1 39.1 40.3 35.6 36.7 37.7 0.33 0.48 0.75 -1.01 22.8 34.9 62.6A
4/23/2017 48 35.6 37.9 39.8 35.4 36.0 36.9 0.59 0.68 0.78 -1.01 43.3 53.8 66.7A
4/24/2017 48 36.3 38.2 40.5 35.4 36.0 37.3 0.62 0.70 0.77 -1.01 46.6 56.5 65.8A
4/25/2017 48 35.2 39.5 45.1 35.2 37.0 40.5 0.59 0.68 0.78 -1.01 44.1 53.2 66.4A
4/26/2017 48 36.0 40.1 47.8 35.8 37.6 40.9 0.53 0.62 0.73 -1.01 37.4 47.7 59.8A
4/27/2017 48 35.4 39.5 44.7 35.6 37.3 40.1 0.50 0.57 0.66 -1.01 35.5 41.7 51.7A
4/28/2017 48 31.4 38.2 45.3 35.0 37.1 39.8 0.45 0.51 0.57 -1.01 31.0 36.1 42.1A
4/29/2017 48 36.3 38.2 39.8 35.8 36.6 37.1 0.46 0.61 0.84 -1.01 32.2 47.3 75.0A
4/30/2017 48 33.6 38.9 44.9 35.4 37.3 41.4 0.60 0.70 0.84 -1.01 44.8 56.6 76.1A
5/1/2017 48 30.0 38.8 49.8 34.8 37.7 44.0 0.48 0.55 0.67 -1.01 33.2 40.1 52.9 A
5/2/2017 48 34.6 37.6 41.4 35.8 37.3 39.9 0.42 0.47 0.55 -1.01 28.6 32.8 39.6 A
5/3/2017 48 34.4 38.4 44.2 35.6 38.3 43.6 0.40 0.44 0.48 -1.01 27.2 30.0 33.3 A
5/4/2017 48 27.9 36.2 43.6 34.4 37.2 42.0 0.35 0.39 0.45 -1.01 23.7 26.7 31.4 A
5/5/2017 48 37.3 40.6 45.5 36.5 37.1 38.6 0.35 0.64 0.96 -1.01 23.6 52.1 95 A
5/6/2017 48 39.2 41.6 45.3 36.1 37.2 39.4 0.67 0.73 0.83 -1.01 53.0 60.2 74.2 A
5/7/2017 48 37.7 40.0 43.1 36.3 37.5 39.2 0.55 0.63 0.74 -1.01 40.2 47.8 61.4 A
5/8/2017 48 34.2 43.7 56.1 35.8 38.9 44.7 0.50 0.61 0.73 -1.01 34.9 45.9 59.5 A
5/9/2017 48 31.6 41.3 51.0 35.4 38.9 45.3 0.47 0.60 0.70 -1.01 32.8 44.8 56.1 A
5/10/2017 48 31.4 39.1 45.1 35.2 37.8 41.4 0.43 0.56 0.69 -1.01 29.4 41.2 55.5A
5/11/2017 48 40.3 43.0 49.1 36.0 37.3 40.7 0.72 1.06 1.38 -1.01 58.8 118 198 A:e
5/12/2017 48 41.1 44.1 49.2 36.5 38.7 42.7 0.73 0.82 0.97 -1.01 59.6 72.7 97 A
5/13/2017 48 36.0 44.2 51.7 36.3 38.6 42.7 0.65 0.71 0.82 -1.01 50.5 57.1 71.6A
5/14/2017 48 31.0 39.9 46.7 36.0 38.2 41.6 0.54 0.61 0.69 -1.01 39.2 45.4 55.3A
5/15/2017 48 39.8 40.8 41.8 36.1 37.4 38.1 0.56 0.90 1.69 -1.01 40.9 105 312 A:e
5/16/2017 48 39.6 42.3 45.6 36.5 37.9 39.9 0.69 0.85 1.25 -1.01 55.2 78.4 160 A:e
5/17/2017 48 39.0 41.2 46.0 37.1 38.3 40.7 0.59 0.65 0.71 -1.01 43.2 50.4 57.4A
5/18/2017 48 36.5 42.8 49.6 37.1 39.2 42.9 0.54 0.60 0.66 -1.01 38.4 45.1 51.2A
5/19/2017 48 32.4 42.3 51.0 35.8 39.8 46.2 0.49 0.56 0.61 -1.01 34.6 40.5 45.6A
5/20/2017 48 35.2 43.6 54.1 36.0 39.5 43.8 0.44 0.51 0.58 -1.01 30.6 35.8 42.4A
5/21/2017 48 34.0 38.9 46.5 37.1 38.5 40.1 0.41 0.46 0.52 -1.01 28.3 32.0 36.8A
5/22/2017 48 40.1 45.2 52.1 37.5 39.4 42.9 0.41 0.45 0.51 -1.01 27.7 31.4 36.1A
5/23/2017 48 41.4 44.8 47.4 38.1 39.7 43.5 0.42 0.54 0.71 -1.01 28.7 39.8 57.4A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 7 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
5/24/2017 48 38.3 44.1 52.6 36.3 39.6 44.7 0.45 0.54 0.63 -1.01 31.3 39.3 47.9A
5/25/2017 48 36.5 41.8 50.8 36.7 39.2 43.5 0.40 0.46 0.54 -1.01 26.9 32.1 38.8A
5/26/2017 48 32.6 40.4 48.9 36.3 39.2 43.3 0.34 0.39 0.48 -1.01 23.3 26.7 33.2A
5/27/2017 48 36.9 41.3 48.9 36.3 39.9 47.1 0.29 0.34 0.40 -1.01 20.0 23.4 27.1A
5/28/2017 48 37.5 44.5 52.2 37.7 40.3 43.8 0.25 0.30 0.36 -1.01 17.9 20.6 24.6A
5/29/2017 48 33.0 44.0 52.9 36.3 41.2 47.8 0.22 0.32 0.46 -1.01 16.4 22.3 31.6A
5/30/2017 48 41.4 43.4 44.6 39.2 39.5 40.1 0.29 0.45 0.62 -1.01 20.3 32.5 47.0A
5/31/2017 48 41.4 46.1 51.7 38.3 40.7 44.9 0.51 0.59 0.65 -1.01 36.5 43.4 50.0A
6/1/2017 48 43.1 47.9 53.4 38.8 40.4 42.9 0.44 0.50 0.57 -1.01 30.3 35.6 42.2 A
6/2/2017 48 42.0 47.8 58.8 38.3 41.1 47.3 0.42 0.50 0.59 -1.01 29.0 35.3 43.3 A
6/3/2017 48 37.7 41.0 43.1 38.4 39.1 40.1 0.43 0.59 1.00 -1.01 29.1 47.0 104 A
6/4/2017 48 41.1 44.7 47.8 38.6 39.6 40.5 0.68 0.83 0.99 -1.01 54.1 74.6 100 A:e
6/5/2017 48 45.6 52.8 60.5 39.0 42.8 48.9 0.60 0.67 0.72 -1.01 44.7 52.1 58.6 A
6/6/2017 48 45.6 52.0 58.8 39.8 41.7 45.8 0.60 0.64 0.69 -1.01 44.4 48.9 54.4 A
6/7/2017 48 38.6 50.5 59.3 38.8 43.1 50.6 0.53 0.60 0.67 -1.01 37.8 44.6 52.7 A
6/8/2017 48 41.6 48.0 55.4 39.6 43.6 49.9 0.52 0.58 0.63 -1.01 37.1 42.9 48.1 A
6/9/2017 48 38.4 44.3 52.2 39.4 42.0 45.3 0.44 0.50 0.58 -1.01 30.3 35.5 42.6 A
6/10/2017 48 41.4 44.0 45.3 40.3 41.0 41.8 0.47 0.53 0.61 -1.01 32.3 38.0 46.0A
6/11/2017 48 40.3 46.4 52.4 39.4 42.2 47.3 0.43 0.47 0.54 -1.01 29.1 32.7 39.1A
6/12/2017 48 36.7 49.0 60.0 38.3 42.8 48.0 0.36 0.40 0.46 -1.01 24.1 27.2 31.8A
6/13/2017 48 36.0 48.4 60.4 38.4 44.2 51.9 0.29 0.36 0.44 -1.01 20.3 24.8 30.1A
6/14/2017 48 38.3 46.9 54.0 40.5 43.1 48.0 0.29 0.35 0.42 -1.01 19.9 23.7 28.3A
6/15/2017 48 42.5 48.1 53.8 40.7 43.4 47.8 0.29 0.34 0.39 -1.01 19.8 23.3 26.4A
6/16/2017 48 36.3 45.8 54.1 39.0 41.8 44.2 0.26 0.30 0.34 -1.01 18.3 20.9 23.2A
6/17/2017 48 46.0 47.4 49.9 40.9 41.7 42.4 0.27 0.30 0.35 -1.01 18.7 20.7 23.9A
6/18/2017 48 44.7 51.0 59.2 40.7 43.3 48.9 0.27 0.32 0.38 -1.01 18.9 22.2 25.5A
6/19/2017 48 45.6 48.7 55.4 41.4 43.1 47.3 0.28 0.33 0.38 -1.01 19.7 22.7 25.6A
6/20/2017 48 44.9 49.1 53.6 40.5 42.3 44.0 0.27 0.30 0.34 -1.01 19.0 20.7 23.1A
6/21/2017 48 46.5 49.8 54.5 41.1 43.1 45.6 0.24 0.28 0.31 -1.01 17.3 19.5 21.3A
6/22/2017 48 44.4 49.8 56.1 40.9 44.1 49.1 0.21 0.25 0.30 -1.01 15.6 18.1 20.6A
6/23/2017 48 45.3 48.2 51.5 41.8 42.9 43.8 0.16 0.23 0.28 -1.01 13.6 16.6 19.2A
6/24/2017 48 39.9 46.7 52.4 40.5 43.0 45.3 0.16 0.22 0.30 -1.01 13.7 16.1 20.7A
6/25/2017 48 45.3 47.4 49.9 42.4 43.5 45.6 0.26 0.55 0.72 -1.01 18.2 41.1 58.3A
6/26/2017 48 44.4 49.4 54.1 41.3 44.0 48.7 0.39 0.48 0.59 -1.01 26.3 33.4 43.5A
6/27/2017 48 43.8 47.5 52.1 41.3 43.6 47.4 0.33 0.37 0.41 -1.01 22.6 25.0 28.2A
6/28/2017 48 46.0 49.8 56.9 42.0 45.5 52.6 0.27 0.31 0.34 -1.01 18.9 21.3 23.4A
6/29/2017 48 44.6 47.4 50.3 42.2 43.6 44.9 0.22 0.26 0.30 -1.01 16.2 18.3 20.8A
6/30/2017 48 45.5 47.9 51.7 42.4 43.8 45.8 0.21 0.24 0.27 -1.01 16.0 17.4 19.0A
7/1/2017 48 46.2 51.0 59.7 42.5 45.4 52.1 0.22 0.27 0.31 -1.01 16.3 18.8 21.2 A:e
7/2/2017 48 45.5 47.8 51.5 42.4 43.8 45.5 0.21 0.25 0.28 -1.01 15.9 17.8 19.7 A
7/3/2017 48 44.4 49.7 58.1 42.2 44.8 50.6 0.18 0.21 0.26 -1.01 14.5 15.9 18.5 A
7/4/2017 48 46.4 51.5 57.6 42.4 45.1 49.9 0.15 0.18 0.22 -1.01 13.0 14.4 16.1 A
7/5/2017 48 45.1 48.7 51.5 42.4 44.4 46.9 0.13 0.17 0.21 -1.01 12.3 14.1 15.9 A
7/6/2017 48 47.3 49.1 51.7 43.1 44.3 45.8 0.15 0.19 0.22 -1.01 13.1 14.7 16.4 A
7/7/2017 48 47.6 48.7 51.0 43.3 44.5 46.4 0.16 0.22 0.36 -1.01 13.5 16.5 24.6 A
7/8/2017 48 48.0 48.6 49.4 44.4 44.8 45.6 0.35 0.56 0.78 -1.01 23.5 42.1 66.4 A
7/9/2017 48 46.4 49.5 56.8 42.7 44.6 47.8 0.43 0.49 0.60 -1.01 29.5 34.6 44.7 A
7/10/2017 48 45.5 49.8 55.5 43.1 44.9 47.4 0.34 0.42 0.48 -1.01 23.0 28.5 33.3A
7/11/2017 48 44.6 51.1 62.4 42.4 46.1 52.4 0.27 0.33 0.37 -1.01 19.2 22.2 25.4A
7/12/2017 48 43.8 51.9 65.5 43.3 47.6 54.0 0.22 0.26 0.30 -1.01 16.4 18.5 20.6A
7/13/2017 48 51.9 55.8 62.4 46.2 48.6 51.5 0.20 0.24 0.27 -1.01 15.3 17.2 18.7A
7/14/2017 48 49.4 52.5 57.8 46.0 48.0 51.3 0.17 0.21 0.25 -1.01 14.1 15.9 17.6A
7/15/2017 48 48.5 51.2 55.0 44.9 46.1 47.1 0.14 0.18 0.22 -1.01 12.8 14.6 16.1A
7/16/2017 48 48.2 51.3 55.7 44.4 46.8 49.8 0.13 0.16 0.20 -1.01 12.2 13.6 15.5A
7/17/2017 48 51.0 52.7 57.1 46.2 47.4 49.2 0.11 0.16 0.20 -1.01 11.5 13.3 15.3A
7/18/2017 32 48.2 50.0 51.9 44.9 46.0 58.0 0.10 0.13 0.18 -1.01 11.0 12.4 14.4A:e
7/19/2017 0
7/20/2017 0 GAP IN RECORD DUE TO DOWNLOAD ERROR.
7/21/2017 0
7/22/2017 0
7/23/2017 0
7/24/2017 0
7/25/2017 0
7/26/2017 0
7/27/2017 0
7/28/2017 0
7/29/2017 0
7/30/2017 0
7/31/2017 0
8/1/2017 0
8/2/2017 0
8/3/2017 0
8/4/2017 0
8/5/2017 0
8/6/2017 0
8/7/2017 0
8/8/2017 0
8/9/2017 0
8/10/2017 0
8/11/2017 0
8/12/2017 0
8/13/2017 0
8/14/2017 0
8/15/2017 0
8/16/2017 0
8/17/2017 0
8/18/2017 0
8/19/2017 0
8/20/2017 0
8/21/2017 0
8/22/2017 23 47.6 54.7 66.0 47.3 49.9 52.2 0.09 0.11 0.13 -1.01 10.6 11.3 12.4A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 8 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
8/23/2017 48 49.1 54.0 62.9 46.5 47.7 49.4 0.07 0.10 0.12 -1.01 10.1 11.0 12.0A
8/24/2017 48 46.0 51.0 55.9 46.0 47.6 49.6 0.08 0.17 0.25 -1.01 10.2 14.0 17.8A
8/25/2017 48 45.5 48.2 55.5 44.7 46.2 49.4 0.16 0.21 0.25 -1.01 13.4 15.8 18.0A
8/26/2017 48 44.9 48.8 54.3 44.4 45.8 48.5 0.13 0.20 0.26 -1.01 12.4 15.3 18.3A
8/27/2017 48 40.1 48.3 57.6 43.3 45.4 48.0 0.12 0.16 0.19 -1.01 11.9 13.4 14.8A
8/28/2017 48 44.9 49.5 58.8 44.6 46.0 48.5 0.11 0.15 0.19 -1.01 11.5 12.9 14.6A
8/29/2017 48 46.9 48.9 51.5 45.1 46.1 47.8 0.12 0.29 0.45 -1.01 12.1 21.0 31.1A
8/30/2017 48 47.3 50.3 55.0 44.7 46.4 49.4 0.18 0.24 0.34 -1.01 14.2 17.6 23.4A
8/31/2017 48 42.2 47.9 55.4 43.3 45.1 48.0 0.16 0.20 0.25 -1.01 13.4 15.3 18.1A
9/1/2017 48 44.6 48.5 54.5 44.4 45.8 48.0 0.14 0.17 0.21 -1.01 12.5 14.2 15.9 A
9/2/2017 48 47.1 48.4 50.1 45.1 45.7 46.2 0.15 0.28 0.52 -1.01 12.9 19.8 37.3 A
9/3/2017 48 47.3 49.0 50.1 45.3 46.1 46.9 0.37 0.53 0.73 -1.01 24.8 38.5 59.2 A
9/4/2017 48 48.7 50.4 52.2 46.0 46.3 46.9 0.52 0.63 0.79 -1.01 36.6 48.8 67.6 A
9/5/2017 48 47.1 52.6 64.1 45.1 46.9 49.1 0.38 0.46 0.54 -1.01 26.1 31.9 38.3 A
9/6/2017 48 46.7 49.0 50.5 45.1 46.0 46.7 0.34 0.46 0.64 -1.01 22.9 32.4 49.5 A
9/7/2017 48 49.4 50.8 53.8 45.6 46.6 48.2 0.41 0.49 0.63 -1.01 27.7 34.2 48.2 A
9/8/2017 48 46.0 50.6 58.5 44.6 46.2 49.4 0.33 0.38 0.44 -1.01 22.6 26.0 29.9 A
9/9/2017 48 44.6 48.2 52.4 44.0 45.7 48.0 0.32 0.38 0.45 -1.01 22.0 25.6 31.4 A
9/10/2017 48 47.1 51.1 56.8 45.3 46.5 48.7 0.35 0.41 0.46 -1.01 23.9 28.3 31.4A
9/11/2017 48 44.9 50.4 54.0 44.9 46.2 47.6 0.29 0.34 0.40 -1.01 20.3 23.3 27.3A
9/12/2017 48 50.6 53.2 55.5 46.9 48.0 49.6 0.26 0.36 0.47 -1.01 18.5 24.5 32.9A
9/13/2017 48 48.2 50.6 54.5 45.6 46.8 48.7 0.27 0.33 0.36 -1.01 18.9 22.3 24.3A
9/14/2017 48 46.0 51.2 60.5 45.5 46.5 48.7 0.29 0.33 0.41 -1.01 19.8 22.3 27.7A
9/15/2017 48 45.5 49.6 58.0 44.6 46.4 48.7 0.30 0.87 1.60 -1.01 20.5 94 274 A:e
9/16/2017 48 44.0 45.7 49.6 43.3 43.9 44.7 0.63 0.78 1.01 -1.01 47.8 68.1 105 A:e
9/17/2017 48 43.3 47.2 54.7 41.8 43.4 45.8 0.62 0.74 0.94 -1.01 47.1 61.9 92 A
9/18/2017 48 41.8 46.9 56.1 42.0 43.4 46.2 0.55 0.61 0.67 -1.01 39.8 45.9 52.3A
9/19/2017 48 37.7 45.9 58.8 40.9 43.1 46.5 0.46 0.53 0.59 -1.01 32.1 37.9 43.7A
9/20/2017 48 42.9 48.0 52.1 43.3 44.8 46.7 0.51 0.77 1.22 -1.01 35.8 68.0 153 A:e
9/21/2017 48 49.2 50.7 52.2 45.3 45.8 46.7 0.60 0.65 0.72 -1.01 44.8 50.0 58.3A
9/22/2017 48 42.9 45.9 49.1 42.9 44.5 45.5 0.59 0.65 0.74 -1.01 43.5 50.6 60.9A
9/23/2017 48 41.1 43.1 46.2 42.2 43.1 44.9 0.57 0.61 0.65 -1.01 41.2 46.1 49.7A
9/24/2017 48 40.1 44.7 52.1 41.4 42.9 44.9 0.52 0.57 0.64 -1.01 37.2 41.5 48.6A
9/25/2017 48 41.8 46.1 54.7 42.7 43.7 46.2 0.49 0.53 0.57 -1.01 34.7 37.5 41.6A
9/26/2017 48 37.3 44.4 49.9 41.6 43.0 44.7 0.41 0.47 0.53 -1.01 28.1 32.9 37.4A
9/27/2017 48 43.1 45.5 47.8 42.7 43.3 44.4 0.38 0.42 0.46 -1.01 25.4 29.0 32.1A
9/28/2017 48 42.2 44.2 46.4 42.2 43.1 44.7 0.38 0.43 0.48 -1.01 26.1 29.5 33.5A
9/29/2017 48 39.2 42.3 44.9 41.1 42.5 44.4 0.38 0.43 0.47 -1.01 25.7 29.2 32.6A
9/30/2017 48 37.3 45.6 58.3 40.7 42.3 45.3 0.33 0.36 0.40 -1.01 22.4 24.5 27.4A
10/1/2017 48 36.9 43.4 48.7 40.7 42.4 44.6 0.30 0.34 0.38 -1.01 20.8 22.9 25.9A
10/2/2017 48 42.0 47.0 55.5 41.8 43.2 45.1 0.28 0.31 0.37 -1.01 19.2 21.6 24.9A
10/3/2017 48 43.1 46.5 52.1 42.2 43.3 44.7 0.25 0.28 0.35 -1.01 18.0 19.8 23.9A
10/4/2017 48 40.7 48.2 55.2 42.5 44.3 46.0 0.26 0.43 0.63 -1.01 18.6 30.0 48.2A
10/5/2017 48 46.9 50.6 55.4 42.9 44.0 46.0 0.29 0.35 0.43 -1.01 19.8 24.0 29.1A
10/6/2017 48 44.2 49.8 59.7 42.4 43.7 46.2 0.25 0.30 0.34 -1.01 18.1 20.4 23.1A
10/7/2017 48 41.6 45.3 51.7 41.6 43.8 46.4 0.30 0.57 0.87 -1.01 20.5 42.9 81 A
10/8/2017 48 41.1 45.0 51.3 41.3 42.2 43.6 0.49 0.55 0.59 -1.01 34.2 39.4 44.1A
10/9/2017 48 36.0 45.0 58.6 39.4 41.7 44.7 0.42 0.46 0.52 -1.01 28.7 32.0 36.7A
10/10/2017 48 39.2 46.3 54.0 40.3 42.3 44.7 0.35 0.39 0.44 -1.01 23.9 26.7 30.3 A
10/11/2017 48 47.4 49.6 51.5 43.5 45.3 47.1 0.32 0.79 1.94 -1.01 21.6 102 433 A:e
10/12/2017 48 44.2 50.3 60.2 42.0 44.7 46.7 0.78 1.06 1.70 -1.01 67.0 122 316 A:e
10/13/2017 48 36.9 42.4 52.9 40.1 41.5 43.1 0.72 0.78 0.84 -1.01 58.5 66.3 76.0 A
10/14/2017 48 39.9 43.0 49.8 41.1 41.8 43.6 0.76 0.86 0.98 -1.01 63.3 79.3 99 A:e
10/15/2017 48 35.6 40.8 47.4 39.9 41.2 43.1 0.68 0.76 0.82 -1.01 53.9 64.3 72.4 A
10/16/2017 48 35.0 41.2 52.9 39.2 40.6 42.5 0.65 0.68 0.72 -1.01 50.4 53.6 58.1 A
10/17/2017 48 38.3 40.4 43.3 39.6 40.4 41.4 0.72 0.81 0.99 -1.01 58.0 71.1 101 A
10/18/2017 48 36.7 39.3 44.6 38.6 39.5 40.9 0.66 0.73 0.78 -1.01 51.7 59.3 66.9 A
10/19/2017 48 35.2 39.5 48.3 38.1 39.0 40.9 0.63 0.67 0.71 -1.01 47.7 52.2 57.2 A
10/20/2017 48 33.8 35.7 38.6 38.1 39.0 40.1 0.59 0.63 0.66 -1.01 43.7 47.6 51.1 A
10/21/2017 48 31.2 34.2 40.3 35.8 37.0 38.4 0.54 0.58 0.61 -1.01 39.2 42.3 46.3 A
10/22/2017 48 26.2 32.4 44.2 35.8 37.0 39.0 0.49 0.53 0.57 -1.01 34.1 37.6 41.4 A
10/23/2017 48 25.8 34.5 49.9 35.8 36.8 38.8 0.44 0.48 0.52 -1.01 30.4 33.6 36.6 A
10/24/2017 48 26.5 38.9 46.4 35.8 37.0 38.3 0.41 0.74 1.61 -1.01 28.2 77.5 276 A:e
10/25/2017 48 43.3 45.9 48.0 38.3 40.2 41.6 0.71 0.78 0.89 -1.01 56.8 66.7 83 A
10/26/2017 48 41.1 44.5 53.3 40.1 40.7 41.8 0.65 0.75 0.92 -1.01 50.3 62.8 88 A
10/27/2017 48 36.9 43.2 45.8 38.4 40.1 41.3 0.60 0.64 0.70 -1.01 44.9 49.3 55.5 A
10/28/2017 48 41.1 43.0 45.5 40.5 40.9 41.3 0.61 0.68 0.79 -1.01 45.4 54.0 67.7 A
10/29/2017 48 43.6 46.5 48.3 40.7 42.3 43.3 0.73 1.00 1.68 -1.01 59.3 111 305 A:e
10/30/2017 48 43.3 46.7 51.2 40.5 41.7 42.4 0.76 0.90 1.11 -1.01 63.7 85 125 A:e
10/31/2017 48 36.3 42.5 56.9 38.8 40.2 42.0 0.67 0.73 0.78 -1.01 52.9 59.5 66.2 A
11/1/2017 48 34.6 40.4 50.1 38.6 40.0 41.4 0.60 0.65 0.69 -1.01 44.9 49.8 54.9A
11/2/2017 48 34.6 40.2 49.6 38.8 39.9 41.4 0.56 0.60 0.63 -1.01 40.6 44.6 47.9A
11/3/2017 48 32.6 39.0 47.8 37.5 39.0 40.9 0.50 0.55 0.58 -1.01 35.5 39.4 42.3A
11/4/2017 48 39.0 43.0 45.6 40.1 41.1 42.2 0.50 0.52 0.55 -1.01 35.1 37.1 39.7A
11/5/2017 48 38.8 41.0 45.6 38.4 39.7 40.3 0.47 0.51 0.56 -1.01 32.3 35.7 40.7A
11/6/2017 48 32.4 39.9 53.4 37.3 38.3 39.8 0.43 0.46 0.49 -1.01 29.3 31.4 34.0A
11/7/2017 48 37.1 41.8 46.5 38.3 39.6 40.9 0.40 0.43 0.46 -1.01 27.1 29.3 31.6A
11/8/2017 48 36.3 42.3 53.6 38.4 39.1 40.1 0.38 0.40 0.42 -1.01 25.5 27.3 29.0A
11/9/2017 48 36.9 40.2 45.1 38.3 39.3 40.1 0.35 0.41 0.44 -1.01 24.0 27.6 30.2A
11/10/2017 48 38.6 42.5 46.5 38.4 39.3 40.7 0.36 0.39 0.41 -1.01 24.1 26.2 28.0 A
11/11/2017 48 36.1 46.3 55.5 39.2 40.5 41.3 0.35 0.37 0.39 -1.01 23.8 25.0 26.8 A
11/12/2017 48 32.6 40.1 47.1 38.1 39.1 40.3 0.32 0.34 0.37 -1.01 21.6 23.2 24.9 A
11/13/2017 48 37.1 41.4 50.5 39.6 40.1 40.9 0.31 0.34 0.37 -1.01 21.4 23.2 25.2 A
11/14/2017 48 33.2 40.0 47.4 38.1 39.4 40.7 0.29 0.31 0.35 -1.01 20.3 21.4 23.5 A
11/15/2017 48 37.9 41.9 46.9 39.2 40.4 41.6 0.30 0.37 0.46 -1.01 20.6 25.1 31.6 A
11/16/2017 48 39.4 43.2 45.3 38.8 40.3 42.0 0.33 0.37 0.42 -1.01 22.5 25.5 28.5 A
11/17/2017 48 40.7 42.2 44.7 38.4 39.3 40.1 0.32 0.35 0.40 -1.01 21.8 23.5 27.2 A
11/18/2017 48 40.7 46.3 56.4 38.3 40.7 43.6 0.30 0.34 0.38 -1.01 20.8 22.9 25.6 A
11/19/2017 48 36.5 39.2 41.4 37.5 38.8 42.5 0.32 0.39 0.49 -1.01 21.6 26.4 34.6 A
11/20/2017 48 34.8 37.5 42.5 36.3 36.8 37.5 0.32 0.34 0.38 -1.01 21.6 23.1 26.0 A
11/21/2017 48 35.0 39.0 43.8 36.3 37.2 38.4 0.31 0.37 0.51 -1.01 21.5 25.6 36.3 A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 9 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
11/22/2017 48 33.2 40.4 49.1 36.1 37.8 40.3 0.33 0.39 0.46 -1.01 22.5 26.6 31.8 A
11/23/2017 48 34.4 36.4 38.1 34.6 35.4 36.1 0.29 0.36 0.41 -1.01 20.1 24.3 27.8 A
11/24/2017 48 33.6 37.1 39.9 34.8 36.5 37.9 0.32 0.36 0.41 -1.01 22.0 24.5 27.9 A
11/25/2017 48 34.2 39.6 46.2 36.5 37.4 38.3 0.36 0.49 0.86 -1.01 24.6 36.6 78.1 A
11/26/2017 48 38.1 40.3 45.3 37.3 37.6 38.6 0.60 0.69 0.88 -1.01 44.7 55.0 82 A
11/27/2017 48 37.7 40.1 44.6 36.7 37.7 39.4 0.61 0.86 1.35 -1.01 45.9 83 186 A:e
11/28/2017 48 32.8 38.0 44.2 36.7 37.8 39.6 0.82 1.05 1.34 -1.01 72.6 116 185 A:e
11/29/2017 48 33.6 37.4 40.3 36.7 37.9 38.6 0.71 0.79 0.85 -1.01 57.0 68.0 76.2 A
11/30/2017 48 34.2 37.8 41.1 36.9 37.6 38.4 0.69 0.74 0.81 -1.01 54.3 61.4 71.3 A
12/1/2017 48 37.7 43.2 46.9 37.1 39.1 40.1 0.66 0.90 1.25 -1.01 50.8 89 158 A:e
12/2/2017 48 35.2 39.7 45.5 37.1 37.8 38.6 0.70 0.75 0.84 -1.01 56.2 62.3 75.4A
12/3/2017 48 34.6 37.1 38.8 35.6 37.2 38.1 0.60 0.65 0.71 -1.01 45.1 50.5 57.1A
12/4/2017 48 27.5 33.2 43.6 35.0 35.4 36.1 0.54 0.59 0.64 -1.01 38.9 43.5 48.6A
12/5/2017 48 26.2 31.0 42.4 34.6 35.2 36.0 0.50 0.53 0.56 -1.01 34.8 37.8 41.1A
12/6/2017 48 29.6 34.9 38.6 35.2 36.5 37.3 0.46 0.49 0.52 -1.01 31.9 34.2 36.8A
12/7/2017 48 32.4 35.4 39.9 35.4 36.2 36.7 0.42 0.46 0.49 -1.01 28.5 31.5 34.1A
12/8/2017 48 34.0 35.6 37.1 35.4 36.0 36.7 0.41 0.43 0.47 -1.01 27.9 29.6 33.0A
12/9/2017 48 33.4 38.3 44.9 34.2 36.4 37.7 0.47 0.49 0.52 -1.01 32.4 34.5 37.3A
12/10/2017 48 31.8 35.9 37.5 36.5 37.2 38.1 0.43 0.46 0.49 -1.01 29.5 31.9 34.5 A
12/11/2017 48 31.6 34.9 38.8 36.3 37.0 37.9 0.38 0.41 0.44 -1.01 25.6 28.0 30.4 A
12/12/2017 48 36.3 38.3 42.9 36.5 37.1 38.1 0.44 0.47 0.54 -1.01 29.9 32.7 38.6 A
12/13/2017 48 32.8 36.1 39.9 34.6 36.8 38.1 0.42 0.44 0.47 -1.01 28.4 30.2 32.3 A
12/14/2017 48 31.2 34.5 38.1 34.4 36.0 36.7 0.38 0.43 0.54 -1.01 26.0 29.5 39.0 A
12/15/2017 48 36.3 39.2 41.6 34.6 35.8 36.7 0.46 0.54 0.66 -1.01 31.8 38.8 51.5 A
12/16/2017 48 31.6 35.1 38.4 34.8 35.7 36.3 0.39 0.44 0.49 -1.01 26.5 30.4 33.9 A
12/17/2017 48 31.2 35.4 38.8 34.6 35.2 36.1 0.38 0.42 0.46 -1.01 25.5 28.4 31.5 A
12/18/2017 48 35.4 39.8 42.5 34.8 36.1 37.3 0.39 0.63 1.66 -1.01 26.2 61.9 296 A:e
12/19/2017 48 30.2 36.9 41.3 34.0 35.0 35.8 0.67 0.90 1.64 -1.01 52.6 95 288 A:e
12/20/2017 48 31.4 38.7 40.7 35.0 36.0 36.9 0.60 0.64 0.70 -1.01 44.7 48.7 55.7 A
12/21/2017 48 36.9 38.3 42.4 36.5 37.1 37.7 0.60 0.72 0.87 -1.01 44.9 59.3 79.8 A
12/22/2017 48 32.2 36.9 42.5 33.0 35.7 37.9 0.74 0.93 1.19 -1.01 61.2 91 145 A:e
12/23/2017 48 30.8 32.4 34.2 32.8 34.1 35.0 0.66 0.72 0.78 -1.01 50.8 58.3 67.2 A
12/24/2017 48 25.6 32.1 37.9 33.8 34.7 35.6 0.59 0.63 0.68 -1.01 43.6 47.6 54.2 A
12/25/2017 48 26.2 30.4 34.8 34.6 35.4 36.7 0.53 0.56 0.60 -1.01 37.6 40.9 44.6 A
12/26/2017 48 27.5 32.0 34.8 35.2 36.2 36.7 0.49 0.52 0.56 -1.01 34.3 36.7 40.3 A
12/27/2017 48 30.2 32.7 35.2 35.4 35.7 36.5 0.45 0.47 0.50 -1.01 30.7 33.0 35.5 A
12/28/2017 48 25.2 30.9 35.0 34.8 35.8 36.5 0.41 0.44 0.47 -1.01 27.8 30.2 32.4 A
12/29/2017 48 33.4 36.2 38.1 36.0 36.4 36.9 0.40 0.43 0.48 -1.01 27.1 29.4 33.2 A
12/30/2017 48 35.0 37.5 39.6 35.6 36.4 36.9 0.48 0.54 0.60 -1.01 33.3 39.0 44.8 A
12/31/2017 48 35.6 37.0 38.1 35.6 36.3 36.9 0.43 0.48 0.53 -1.01 29.5 33.4 37.4 A
1/1/2018 48 34.8 36.0 37.5 36.0 36.4 36.7 0.45 0.47 0.50 -1.01 30.6 33.0 35.6 A
1/2/2018 48 29.0 34.1 41.4 34.8 35.8 36.5 0.39 0.43 0.48 -1.01 26.8 29.8 33.4 A
1/3/2018 48 28.1 33.4 44.4 34.4 35.2 36.0 0.37 0.40 0.41 -1.01 24.8 26.9 28.3 A
1/4/2018 48 36.1 38.5 41.3 35.8 36.7 37.7 0.36 0.47 0.78 -1.01 24.7 33.4 67.2 A
1/5/2018 48 34.0 39.4 42.4 35.0 36.0 36.5 0.79 1.07 1.43 -1.01 68.6 121 212 A:e
1/6/2018 48 31.6 37.4 45.8 35.6 36.5 37.9 0.63 0.72 0.82 -1.01 48.4 59.3 73.0 A
1/7/2018 48 30.8 36.4 49.1 35.4 36.1 37.1 0.61 0.63 0.66 -1.01 45.3 47.8 51.5 A
1/8/2018 48 35.2 37.5 39.6 36.5 36.8 37.1 0.60 0.64 0.70 -1.01 44.2 49.0 56.5 A
1/9/2018 48 32.6 36.5 39.4 35.6 36.5 37.1 0.55 0.59 0.64 -1.01 39.3 43.5 48.7 A
1/10/2018 48 34.8 37.4 39.0 36.3 37.0 37.5 0.54 0.58 0.63 -1.01 38.8 43.1 47.8A
1/11/2018 48 36.0 37.5 39.0 36.9 37.1 37.5 0.54 0.57 0.60 -1.01 38.8 41.6 45.0A
1/12/2018 48 32.6 37.1 43.6 36.5 37.1 37.9 0.48 0.52 0.56 -1.01 33.6 36.6 40.4A
1/13/2018 48 35.4 36.9 38.6 36.0 36.8 37.5 0.49 0.53 0.57 -1.01 33.9 37.5 42.1A
1/14/2018 48 33.8 37.0 42.2 36.1 36.7 37.9 0.48 0.52 0.56 -1.01 33.5 36.9 40.2A
1/15/2018 48 31.4 34.1 38.6 35.8 36.6 37.9 0.44 0.47 0.51 -1.01 29.9 32.5 35.7A
1/16/2018 48 30.4 33.0 34.8 34.6 35.5 36.1 0.41 0.44 0.46 -1.01 27.8 30.4 31.8A
1/17/2018 48 28.3 30.1 32.0 33.4 34.1 34.6 0.39 0.42 0.44 -1.01 26.3 28.6 30.5A
1/18/2018 48 25.2 29.0 34.2 34.0 34.7 36.0 0.37 0.40 0.42 -1.01 24.8 27.2 28.9A
1/19/2018 48 26.7 29.8 34.2 33.4 34.2 35.2 0.35 0.37 0.40 -1.01 23.8 25.4 26.9A
1/20/2018 48 27.5 30.6 34.0 34.0 34.3 35.0 0.33 0.35 0.37 -1.01 22.7 24.0 25.2A
1/21/2018 48 19.8 24.6 28.1 32.0 33.1 34.2 0.30 0.34 0.37 -1.01 20.8 23.0 25.1A
1/22/2018 48 20.1 22.0 24.3 31.8 32.3 32.8 0.29 0.31 0.34 -1.01 19.9 21.1 22.9A
1/23/2018 48 24.7 32.2 38.4 32.6 34.2 35.4 0.29 0.30 0.32 -1.01 19.9 20.9 22.0A
1/24/2018 48 30.0 33.6 37.7 34.8 35.3 36.3 0.27 0.30 0.32 -1.01 19.1 20.6 21.7A
1/25/2018 48 25.4 30.3 33.4 33.0 34.3 35.2 0.26 0.29 0.32 -1.01 18.3 19.9 21.6A
1/26/2018 48 16.6 20.5 24.1 31.8 31.9 32.4 0.26 0.26 0.28 -1.01 18.2 18.7 19.5A:e
1/27/2018 48 21.9 23.1 24.3 32.4 33.4 34.2 0.23 0.25 0.27 -1.01 16.9 18.1 19.1A
1/28/2018 48 24.3 25.9 27.5 33.8 34.5 35.2 0.22 0.24 0.27 -1.01 16.3 17.4 18.8A
1/29/2018 48 24.7 30.5 32.8 33.6 34.8 35.8 0.20 0.23 0.26 -1.01 15.5 16.9 18.4A
1/30/2018 48 29.4 30.9 33.8 34.2 35.1 36.0 0.21 0.22 0.24 -1.01 15.6 16.4 17.6A
1/31/2018 48 23.4 26.9 30.0 34.2 34.6 35.2 0.20 0.21 0.23 -1.01 15.2 15.9 17.0A
2/1/2018 48 21.4 25.9 33.6 34.0 34.8 35.4 0.19 0.20 0.22 -1.01 14.9 15.5 16.2 A
2/2/2018 48 21.4 34.4 39.6 34.8 35.7 36.1 0.18 0.20 0.21 -1.01 14.6 15.3 16.0 A
2/3/2018 48 37.3 38.3 39.4 34.6 35.8 36.3 0.20 0.33 0.54 -1.01 15.4 23.0 39.2 A
2/4/2018 48 36.1 37.3 37.9 34.4 34.9 35.4 0.52 0.61 0.66 -1.01 37.2 46.4 51.8 A
2/5/2018 48 34.8 37.6 42.0 35.2 35.7 36.9 0.54 0.59 0.64 -1.01 38.8 43.4 49.0 A
2/6/2018 48 35.2 38.9 44.9 35.2 35.9 36.9 0.46 0.50 0.57 -1.01 31.4 35.7 42.1 A
2/7/2018 48 36.9 37.9 38.8 36.0 36.4 36.7 0.45 0.52 0.57 -1.01 30.9 37.3 41.5 A
2/8/2018 48 32.4 36.2 38.3 33.0 35.5 36.5 0.52 0.61 0.70 -1.01 36.6 45.9 55.6 A
2/9/2018 48 34.2 36.8 39.0 33.8 35.7 37.5 0.59 0.62 0.65 -1.01 43.5 46.6 50.2 A
2/10/2018 48 37.3 38.7 39.9 35.4 36.1 36.5 0.62 0.75 0.99 -1.01 46.9 64.1 101 A
2/11/2018 48 35.2 37.6 42.2 35.2 36.0 37.1 0.74 0.78 0.82 -1.01 60.6 66.7 72.0A
2/12/2018 48 31.2 37.7 44.6 34.8 35.7 37.3 0.62 0.68 0.78 -1.01 46.6 53.3 66.4A
2/13/2018 48 37.3 39.0 40.3 35.0 36.1 37.1 0.56 0.60 0.64 -1.01 40.8 44.9 49.6A
2/14/2018 48 33.0 36.8 40.1 35.8 36.7 38.3 0.53 0.57 0.62 -1.01 38.2 41.6 46.5A
2/15/2018 48 33.8 37.4 42.2 34.8 36.4 37.7 0.52 0.61 0.73 -1.01 37.4 45.9 59.7A
2/16/2018 48 28.6 36.0 45.6 34.2 35.3 37.1 0.51 0.56 0.62 -1.01 35.9 40.4 47.3A
2/17/2018 48 36.5 38.9 40.9 34.6 36.1 37.5 0.51 0.84 1.76 -1.01 35.9 103 341 A:e
2/18/2018 48 31.6 38.3 46.0 34.4 35.4 37.7 0.71 0.93 1.57 -1.01 57.3 95 264 A:e
2/19/2018 48 37.9 40.5 47.6 35.4 37.0 39.4 0.64 0.70 0.76 -1.01 49.4 56.0 63.5A
2/20/2018 48 32.2 37.0 40.3 35.6 36.8 37.9 0.60 0.65 0.70 -1.01 44.3 49.7 55.9A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 10 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
2/21/2018 48 37.9 40.5 43.6 36.5 37.5 39.2 0.58 0.63 0.67 -1.01 42.7 48.4 52.2A
2/22/2018 48 34.2 39.3 43.8 36.0 36.5 37.9 0.56 0.60 0.65 -1.01 40.7 44.4 49.7A
2/23/2018 48 33.0 38.4 44.4 34.8 36.7 38.6 0.54 0.61 0.67 -1.01 39.2 45.8 53.0A
2/24/2018 48 32.4 35.2 39.6 34.2 35.1 37.1 0.50 0.56 0.63 -1.01 35.1 40.9 47.6A
2/25/2018 48 33.4 39.1 43.1 35.0 36.5 39.0 0.50 0.54 0.58 -1.01 35.3 39.1 43.2A
2/26/2018 48 36.9 40.2 44.7 34.8 36.1 38.6 0.50 0.52 0.57 -1.01 34.7 36.9 41.2A
2/27/2018 48 32.4 35.3 40.1 34.2 35.4 37.1 0.44 0.47 0.54 -1.01 29.9 32.9 38.4A
2/28/2018 48 27.9 34.5 41.4 34.2 35.7 38.6 0.41 0.44 0.47 -1.01 28.0 29.9 33.0A
3/1/2018 48 35.0 37.4 40.9 35.0 36.2 37.7 0.40 0.45 0.54 -1.01 27.1 31.2 38.6 A
3/2/2018 48 32.4 34.2 36.5 34.0 35.2 36.0 0.41 0.45 0.48 -1.01 27.6 30.9 33.3 A
3/3/2018 48 30.6 35.5 46.4 34.2 35.7 38.6 0.39 0.41 0.44 -1.01 26.4 27.9 30.4 A
3/4/2018 48 32.4 38.9 47.6 35.2 37.0 40.1 0.37 0.39 0.41 -1.01 24.9 26.4 27.8 A
3/5/2018 48 31.8 38.9 49.1 35.0 36.4 38.4 0.35 0.38 0.41 -1.01 24.1 25.7 27.9 A
3/6/2018 48 37.7 40.3 42.2 36.3 37.4 38.6 0.34 0.43 0.57 -1.01 23.0 29.8 42.0 A
3/7/2018 48 39.8 43.5 48.5 36.9 37.7 39.0 0.57 0.64 0.73 -1.01 42.1 49.4 59.3 A
3/8/2018 48 29.0 31.8 39.6 32.6 34.3 37.1 0.49 0.58 0.65 -1.01 34.1 42.8 49.7 A
3/9/2018 48 24.5 28.5 33.2 32.0 33.0 34.8 0.44 0.48 0.54 -1.01 30.0 33.5 38.4 A
3/10/2018 48 24.5 26.6 29.8 32.0 33.2 34.6 0.41 0.44 0.46 -1.01 28.0 30.0 31.9A
3/11/2018 48 24.7 30.9 40.9 33.0 34.4 36.1 0.39 0.41 0.44 -1.01 26.8 28.1 30.0A
3/12/2018 48 33.2 37.1 45.1 34.6 35.7 37.9 0.37 0.40 0.43 -1.01 24.9 27.0 29.7A
3/13/2018 48 34.8 37.8 46.2 35.8 36.9 39.9 0.34 0.39 0.43 -1.01 23.3 26.2 29.4A
3/14/2018 48 32.4 33.6 34.8 34.6 35.5 35.8 0.37 0.39 0.41 -1.01 25.1 26.5 28.2A
3/15/2018 48 32.8 38.2 39.8 34.4 35.9 36.7 0.39 0.61 0.77 -1.01 26.5 47.2 65.6A
3/16/2018 48 34.2 38.3 44.2 35.0 36.4 39.4 0.57 0.63 0.73 -1.01 41.6 48.1 60.2A
3/17/2018 48 34.0 38.6 43.1 35.2 37.0 40.3 0.51 0.55 0.59 -1.01 36.2 40.1 43.8A
3/18/2018 48 38.4 42.6 52.4 35.8 38.5 44.0 0.50 0.58 0.69 -1.01 35.6 43.4 54.3A
3/19/2018 48 35.0 39.4 47.6 34.8 36.5 39.8 0.53 0.58 0.64 -1.01 38.3 42.3 49.3A
3/20/2018 48 29.4 37.2 49.4 34.8 36.8 40.9 0.48 0.52 0.56 -1.01 33.5 37.3 40.3A
3/21/2018 48 27.3 36.6 44.2 34.2 37.0 41.4 0.47 0.51 0.54 -1.01 33.0 35.9 39.2A
3/22/2018 48 36.0 38.7 42.7 35.4 37.5 39.4 0.50 0.56 0.62 -1.01 35.6 40.7 47.2A
3/23/2018 31 31.0 38.0 49.6 34.4 35.7 40.1 0.49 0.52 0.57 -1.01 34.1 37.4 42.0A
GAP IN RECORD DUE TO EQUIPMENT FAILURE
4/5/2019 16 37.7 44.4 57.3 37.5 39.5 43.8 0.40 0.44 0.46 -1.16 39.3 43.4 46.1 A
4/6/2019 48 35.0 38.6 45.3 36.5 37.9 40.5 0.35 0.39 0.43 -1.16 35.1 38.6 42.8 A
4/7/2019 48 32.4 35.6 41.6 35.4 37.2 41.3 0.26 0.31 0.37 -1.16 28.2 31.6 37.2 A
4/8/2019 48 29.0 35.5 41.4 34.8 36.8 38.8 0.17 0.23 0.28 -1.16 22.1 25.8 29.3 A
4/9/2019 48 33.6 39.5 46.7 35.8 37.9 40.7 0.16 0.19 0.22 -1.16 21.0 23.2 25.3 A
4/10/2019 48 34.3 40.0 46.0 36.3 38.0 39.8 0.17 0.27 0.49 -1.16 22.0 29.1 48.5A
4/11/2019 48 36.6 40.3 49.0 36.1 38.0 40.7 0.33 0.40 0.49 -1.16 33.1 39.4 48.5A
4/12/2019 48 36.6 40.5 47.7 36.7 38.1 40.1 0.31 0.36 0.43 -1.16 31.8 35.8 42.9A
4/13/2019 48 34.7 39.3 45.3 36.7 37.9 39.8 0.27 0.33 0.38 -1.16 28.5 33.8 37.7A
4/14/2019 48 35.0 40.6 50.8 36.9 38.6 42.2 0.26 0.31 0.36 -1.16 28.0 32.0 36.4A
4/15/2019 48 35.2 37.1 39.8 36.9 37.4 38.4 0.28 0.32 0.37 -1.16 29.3 33.1 37.1A
4/16/2019 48 30.5 34.0 38.4 35.2 36.7 38.4 0.25 0.27 0.29 -1.16 27.4 28.7 30.0A:e
4/17/2019 48 29.8 33.7 42.3 34.6 36.0 38.4 0.22 0.24 0.25 -1.16 25.1 26.2 27.4A:e
4/18/2019 48 30.2 35.6 47.3 35.2 37.5 43.5 0.19 0.20 0.22 -1.16 23.1 24.1 25.1A:e
4/19/2019 48 29.3 33.4 41.6 34.6 36.9 40.7 0.16 0.17 0.19 -1.16 21.3 22.2 23.0A:e
4/20/2019 48 23.8 34.6 47.8 34.4 37.7 43.3 0.13 0.15 0.16 -1.16 19.7 20.5 21.3A:e
4/21/2019 48 25.3 30.4 39.1 32.4 35.2 38.6 0.11 0.12 0.13 -1.16 18.2 18.9 19.6A:e
4/22/2019 48 24.9 30.2 40.3 32.4 34.6 38.4 0.08 0.09 0.11 -1.16 16.9 17.6 18.2A:e
4/23/2019 48 20.6 30.7 41.0 33.0 35.5 39.0 0.06 0.07 0.08 -1.16 15.8 16.3 16.9A:e
4/24/2019 48 29.2 35.9 50.3 33.6 37.2 42.9 -0.01 0.06 0.12 -1.16 12.7 15.6 18.7 A
4/25/2019 48 19.3 35.2 50.2 33.8 37.9 44.6 0.00 0.04 0.08 -1.16 13.1 14.8 16.9A
4/26/2019 48 25.7 35.7 46.5 34.8 37.2 40.5 0.00 0.04 0.06 -1.16 13.1 14.8 16.0A
4/27/2019 48 36.1 39.3 42.4 37.1 37.9 39.0 0.03 0.09 0.19 -1.16 14.2 17.2 23.3A
4/28/2019 48 39.2 42.4 48.4 37.3 38.2 39.8 0.18 0.24 0.34 -1.16 22.7 26.9 34.6A
4/29/2019 48 40.4 41.5 43.0 37.1 37.5 37.9 0.32 0.55 0.67 -1.16 32.7 57.1 72.2A
4/30/2019 48 38.7 42.1 47.4 36.9 37.6 39.2 0.62 0.73 0.87 -1.16 65.0 81 108 A:e
5/1/2019 48 35.9 40.6 45.8 36.9 38.0 39.8 0.49 0.56 0.69 -1.16 49.1 58.0 74.9 A
5/2/2019 48 30.9 43.1 54.1 35.6 38.2 41.4 0.37 0.44 0.55 -1.16 36.7 43.6 56.2 A
5/3/2019 48 28.3 42.0 57.8 35.6 39.3 45.6 0.32 0.37 0.43 -1.16 32.5 36.7 42.9 A
5/4/2019 48 34.4 38.0 40.4 36.5 37.7 39.4 0.28 0.33 0.38 -1.16 29.5 33.3 38.1 A
5/5/2019 48 37.1 40.6 51.2 36.5 38.0 39.4 0.32 0.46 0.64 -1.16 32.5 47.1 67.3 A
5/6/2019 48 36.4 40.9 50.7 36.5 38.5 42.7 0.34 0.42 0.54 -1.16 34.6 41.5 54.5 A
5/7/2019 48 35.3 44.1 56.8 36.5 39.2 42.5 0.35 0.39 0.44 -1.16 35.1 38.7 43.4 A
5/8/2019 48 37.5 41.9 49.0 37.5 39.0 41.3 0.32 0.37 0.43 -1.16 32.5 36.7 43.1 A
5/9/2019 48 36.5 42.9 60.7 37.3 39.6 44.9 0.30 0.36 0.43 -1.16 31.0 36.5 42.7 A
5/10/2019 48 33.1 42.0 50.7 36.9 39.2 43.3 0.26 0.33 0.38 -1.16 27.9 33.7 38.3A
5/11/2019 48 31.4 42.3 53.8 36.5 39.6 44.4 0.24 0.30 0.34 -1.16 26.4 30.7 34.6A
5/12/2019 48 33.0 37.1 43.3 37.3 38.4 40.5 0.19 0.25 0.33 -1.16 23.1 27.0 33.5A
5/13/2019 48 34.1 38.4 46.0 36.5 38.7 42.0 0.16 0.22 0.27 -1.16 21.4 24.8 28.9A
5/14/2019 48 34.5 39.7 47.4 36.5 38.8 41.6 0.17 0.21 0.26 -1.16 22.1 24.7 27.9A
5/15/2019 48 32.2 42.8 54.8 37.1 40.0 44.0 0.15 0.20 0.23 -1.16 20.6 23.5 25.9A
5/16/2019 48 32.1 39.3 47.5 37.1 39.2 41.8 0.15 0.20 0.24 -1.16 20.8 23.8 26.4A
5/17/2019 48 33.8 41.5 53.9 36.3 39.7 45.5 0.14 0.19 0.24 -1.16 20.3 23.0 26.5A
5/18/2019 48 37.2 42.7 55.4 37.7 40.1 44.7 0.13 0.20 0.30 -1.16 19.4 24.1 30.6A
5/19/2019 48 30.7 43.0 58.0 36.7 40.8 47.4 0.16 0.23 0.31 -1.16 21.4 25.8 31.7A
5/20/2019 48 35.3 42.0 52.0 37.7 39.9 43.1 0.15 0.23 0.29 -1.16 20.7 25.6 30.0A
5/21/2019 48 37.4 45.0 57.4 38.1 40.9 45.6 0.18 0.24 0.31 -1.16 22.6 26.2 31.6A
5/22/2019 48 38.3 40.7 42.4 38.4 39.2 39.9 0.21 0.39 0.60 -1.16 24.4 40.2 62.6A
5/23/2019 48 39.9 45.9 54.1 38.3 39.9 42.9 0.35 0.42 0.52 -1.16 35.6 42.1 52.0A
5/24/2019 48 38.3 41.3 43.0 38.1 38.9 39.4 0.35 0.45 0.57 -1.16 34.8 45.7 58.9A
5/25/2019 48 36.7 42.0 47.4 37.5 39.0 40.5 0.51 0.56 0.62 -1.16 51.2 57.3 65.5A
5/26/2019 48 41.9 46.3 55.4 38.6 40.0 43.1 0.51 0.60 0.66 -1.16 51.9 62.5 70.9A
5/27/2019 48 41.5 44.8 52.4 38.8 39.8 42.4 0.49 0.55 0.59 -1.16 48.7 56.6 61.8A
5/28/2019 48 41.3 44.5 51.0 38.6 39.6 41.3 0.50 0.54 0.58 -1.16 50.1 54.4 59.5A
5/29/2019 48 40.7 45.7 55.0 38.8 40.2 42.4 0.43 0.49 0.55 -1.16 42.3 49.4 56.1A
5/30/2019 48 41.1 45.2 58.6 39.2 40.2 44.0 0.47 0.53 0.60 -1.16 46.6 54.0 62.1A
5/31/2019 48 39.7 42.5 46.8 38.6 39.8 41.4 0.36 0.42 0.49 -1.16 36.0 42.2 49.3A
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 11 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
BRIDGE GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
6/1/2019 48 41.3 44.9 49.6 39.0 40.2 42.2 0.47 0.53 0.61 -1.16 46.8 53.7 64.0 A
6/2/2019 48 38.3 48.0 60.0 38.6 41.2 45.6 0.38 0.43 0.51 -1.16 38.0 42.4 51.4 A
6/3/2019 48 43.6 50.6 64.0 39.6 42.7 47.6 0.36 0.42 0.50 -1.16 36.0 42.1 50.0 A
6/4/2019 48 42.0 48.9 62.9 39.2 42.3 48.3 0.39 0.45 0.52 -1.16 38.4 44.4 52.2 A
6/5/2019 48 41.5 50.0 61.1 39.0 42.8 48.3 0.37 0.42 0.48 -1.16 36.6 41.8 48.4 A
6/6/2019 48 39.8 50.7 65.9 38.4 43.4 50.5 0.34 0.41 0.48 -1.16 34.6 40.4 47.5 A
6/7/2019 48 32.3 51.5 68.4 38.4 44.1 51.3 0.30 0.35 0.40 -1.16 31.2 35.5 39.5 A
6/8/2019 48 41.8 51.7 67.5 40.5 44.7 52.2 0.25 0.31 0.36 -1.16 27.0 31.7 36.5 A
6/9/2019 48 43.3 47.9 55.5 41.4 42.3 43.8 0.23 0.27 0.33 -1.16 25.9 28.6 33.4 A
6/10/2019 48 42.0 49.2 59.9 40.9 43.4 48.2 0.19 0.24 0.29 -1.16 23.4 26.4 29.9A
6/11/2019 48 39.4 51.3 68.8 39.4 44.6 52.4 0.19 0.25 0.32 -1.16 22.9 27.2 32.3A
6/12/2019 48 42.7 49.0 63.0 41.3 43.4 47.1 0.19 0.23 0.30 -1.16 22.8 25.8 30.6A
6/13/2019 48 45.3 45.9 46.6 41.4 42.1 42.5 0.29 0.53 0.70 -1.16 30.4 54.5 76.5A
6/14/2019 48 43.6 46.5 51.4 41.1 41.7 42.9 0.45 0.53 0.64 -1.16 44.5 53.6 68.3A
6/15/2019 48 41.4 45.1 49.0 40.5 41.5 42.7 0.34 0.39 0.48 -1.16 34.0 38.5 47.9A
6/16/2019 48 41.4 47.0 54.8 40.7 42.5 44.9 0.27 0.32 0.36 -1.16 28.5 32.7 36.1A
6/17/2019 48 44.3 49.9 55.9 41.4 43.9 47.1 0.26 0.31 0.35 -1.16 27.8 32.1 35.6A
6/18/2019 48 46.5 54.2 64.1 41.6 45.7 51.9 0.30 0.34 0.40 -1.16 31.0 34.5 39.7A
6/19/2019 48 43.1 50.6 61.5 41.4 44.3 48.9 0.23 0.27 0.32 -1.16 25.9 28.8 32.5A
6/20/2019 48 42.3 51.4 63.6 41.8 46.0 52.8 0.18 0.23 0.29 -1.16 22.5 25.8 30.1A
6/21/2019 48 43.6 51.6 62.8 42.0 45.2 51.2 0.20 0.23 0.28 -1.16 24.0 25.9 29.1A
6/22/2019 48 44.8 51.6 62.4 42.0 45.3 50.5 0.19 0.23 0.28 -1.16 23.0 25.8 29.3A
6/23/2019 48 42.2 51.1 63.2 41.6 44.8 49.2 0.16 0.20 0.23 -1.16 21.4 23.5 26.1A
6/24/2019 48 42.6 48.4 57.9 42.4 44.5 46.5 0.11 0.18 0.30 -1.16 18.3 22.9 30.7A
6/25/2019 48 47.6 50.0 54.8 44.0 45.8 48.7 0.21 0.66 1.74 -1.16 24.6 105 407 A:e
6/26/2019 48 46.2 48.2 50.3 44.0 45.3 46.9 1.18 1.65 2.14 -1.16 181 376 663 A:e
6/27/2019 48 43.0 46.1 49.1 43.3 44.7 45.3 1.83 2.91 3.46 0.23 64.4 353 1,038 A:e
6/28/2019 48 42.5 48.2 58.0 42.5 44.0 46.4 2.62 2.84 3.14 0.74 79.9 126 200 A:e
6/29/2019 48 43.6 50.8 62.8 42.0 44.3 46.4 2.44 2.53 2.64 0.74 54.5 67.0 84 A:e
6/30/2019 48 41.6 50.4 59.4 42.5 44.2 46.2 2.31 2.39 2.47 0.74 40.5 49.3 59.2 A:e
7/1/2019 48 42.1 52.9 62.6 42.9 46.1 50.6 2.19 2.27 2.35 0.74 30.1 37.0 44.2 A:e
7/2/2019 48 47.3 56.5 69.5 44.0 47.7 52.9 2.18 2.22 2.26 0.74 29.4 32.4 36.1 A:e
7/3/2019 48 45.7 55.9 68.3 45.1 48.1 52.1 2.08 2.14 2.22 0.74 22.3 26.8 32.6 A:e
7/4/2019 48 40.4 52.8 64.5 44.9 47.3 51.0 1.98 2.05 2.11 0.74 16.6 20.7 24.2 A:e
7/5/2019 48 40.2 56.0 70.2 45.5 47.6 49.8 1.93 1.99 2.04 0.74 14.5 17.1 20.1 A:e
7/6/2019 48 46.7 52.9 58.7 47.1 47.7 49.6 1.93 1.94 1.96 0.74 14.3 15.1 15.6 A:e
7/7/2019 48 48.6 60.3 74.7 46.4 48.7 52.1 1.86 1.91 1.97 0.74 11.3 13.5 16.5 A:e
7/8/2019 33 49.3 53.8 67.2 47.4 50.3 87.4 1.86 1.89 1.91 0.74 11.6 12.6 13.5 A:e
7/8/2019 STATION SEVERELY DAMAGED BY FLOOD EVENT ON 6/27/2019 AND REMOVED FROM SERVICE. END OF RECORD THIS INSTALLATION.
NOTES:
1 Record count is the number of individual readings collected by logging equipment. Equipment is configured for 30-minute logging interval.
2 Air and water temperature data collected by HOBO U20 data loggers. Manufacturer's reported accuracy is +/- 0.44 degrees Celcius.
3 'SD Offset' represents shifts made to the stage-discharge curve to reflect changing site conditions over time. It corresponds to the vertical distance from zero on the
outside staff gauge down to the point of zero flow in the creek at the station cross section.
4 Calculated flow greater than 80 cfs is more than double the highest flow measurement at this station and is indicated by a lighter italic font.
Such flows are calculated from an extrapolated station rating curve and are less certain than lower flows (see hydrology memo narrative).
5 Station established August 26, 2015. Data reported through end of record on 7/8/2019.
ABBREVIATIONS:
cfs: cubic feet per second.
F Fahrenheit
ft: feet
OSS: Outside staff.
SD Offset: Stage offset applied to compensate for physical changes to gauging station stage-discharge (rating) curve.
data status: A Flow calculated from accepted final analysis of available site data.Values for the entire record for this station are accepted and final.
A:e Estimated flow calculated from accepted final analysis of available site data.
P Flow calculated from provisional final analysis of available site data.
P:e Estimated flow calculated from provisional analysis of available site data.
All provisional flows are subject to adjustment and revision.
Estimates typically necessary due to transient sensor error, ice affected stage record, or water level below sensor elevation.
Daily statistics are flagged as estimated if more than 3% of individual records for that day are estimated.
12/3/2021
Daily, _BridgeHydrology.xlsx
Page 12 of 12
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
8/17/2016 29 --- 49.8 51.8 53.1 -0.22 -0.21 -0.19 -0.76 12.6 12.9 13.3 A
8/18/2016 96 --- 47.7 50.2 54.0 -0.27 -0.24 -0.20 -0.76 11.5 12.3 13.0 A
8/19/2016 96 --- 48.2 49.9 53.0 -0.28 -0.26 -0.20 -0.76 11.3 11.9 13.1 A
8/20/2016 96 --- 47.7 50.0 53.7 -0.31 -0.29 -0.26 -0.76 10.8 11.2 11.7 A
8/21/2016 96 --- 48.9 50.9 53.5 -0.32 -0.30 -0.27 -0.76 10.5 10.8 11.5 A
8/22/2016 96 --- 48.9 49.9 51.2 -0.33 -0.31 -0.28 -0.76 10.3 10.7 11.4 A
8/23/2016 96 --- 48.4 49.1 50.0 -0.33 -0.30 -0.24 -0.76 10.3 10.9 12.2 A
8/24/2016 96 --- 46.9 49.9 53.3 -0.33 -0.31 -0.28 -0.76 10.2 10.7 11.4 A
8/25/2016 96 --- 47.7 50.0 52.8 -0.35 -0.33 -0.31 -0.76 9.9 10.3 10.7 A
8/26/2016 96 --- 48.0 50.8 54.7 -0.37 -0.35 -0.33 -0.76 9.5 9.9 10.2 A
8/27/2016 96 --- 48.5 51.7 56.8 -0.39 -0.37 -0.35 -0.76 9.0 9.4 9.8 A
8/28/2016 96 --- 50.7 53.7 59.4 -0.41 -0.39 -0.37 -0.76 8.5 8.9 9.5 A
8/29/2016 96 --- 50.1 53.1 58.3 -0.43 -0.42 -0.41 -0.76 8.0 8.3 8.6 A
8/30/2016 96 --- 48.0 51.3 55.0 -0.45 -0.44 -0.42 -0.76 7.6 8.0 8.2 A
8/31/2016 96 --- 51.0 51.4 51.9 -0.46 -0.37 -0.07 -0.76 7.5 9.3 15.7 A
9/1/2016 96 --- 51.4 51.9 52.8 -0.26 -0.18 -0.08 -0.76 11.8 13.5 15.5 A
9/2/2016 96 --- 51.4 52.5 54.0 -0.25 -0.19 0.08 -0.76 12.0 13.2 18.9 A
9/3/2016 96 --- 48.5 51.1 53.7 -0.16 -0.07 0.16 -0.76 13.8 15.7 20.4 A
9/4/2016 96 --- 48.5 50.1 51.7 -0.17 -0.10 0.00 -0.76 13.7 15.1 17.2 A
9/5/2016 96 --- 46.4 48.4 51.2 -0.19 -0.15 -0.11 -0.76 13.2 14.0 15.0 A
9/6/2016 96 --- 46.8 48.3 51.0 -0.23 -0.20 -0.17 -0.76 12.3 13.1 13.7 A
9/7/2016 96 --- 46.4 47.6 49.8 -0.25 -0.23 -0.20 -0.76 11.9 12.4 13.0 A
9/8/2016 96 --- 44.4 47.2 52.6 -0.29 -0.26 -0.23 -0.76 11.2 11.8 12.3 A
9/9/2016 96 --- 44.8 46.6 49.4 -0.33 -0.30 -0.26 -0.76 10.4 10.9 11.8 A
9/10/2016 96 --- 46.4 48.5 51.7 -0.33 0.22 1.14 -0.76 10.2 21.4 39.1 A
9/11/2016 96 --- 47.5 48.7 50.3 0.30 0.53 0.82 -0.76 23.2 27.7 33.1 A
9/12/2016 96 --- 45.3 46.9 48.4 0.15 0.30 0.49 -0.76 20.2 23.2 27.0 A
9/13/2016 96 --- 44.8 46.1 48.0 0.03 0.13 0.44 -0.76 17.8 19.9 25.8 A
9/14/2016 96 --- 45.9 46.9 47.8 0.11 0.18 0.29 -0.76 19.4 20.9 23.0 A
9/15/2016 96 --- 45.5 46.4 47.8 0.04 0.11 0.18 -0.76 18.0 19.3 20.8 A
9/16/2016 96 --- 43.1 45.8 47.1 0.02 0.09 0.18 -0.76 17.5 19.0 20.8 A
9/17/2016 96 --- 42.2 43.2 44.2 0.02 0.09 0.26 -0.76 17.6 18.9 22.4 A
9/18/2016 96 --- 42.9 44.8 47.3 -0.08 -0.01 0.06 -0.76 15.6 17.1 18.4 A
9/19/2016 96 --- 44.2 46.1 48.4 -0.12 0.24 0.96 -0.76 14.8 21.9 35.9 A
9/20/2016 96 --- 42.2 44.4 47.3 0.10 0.24 0.48 -0.76 19.3 22.0 26.6 A
9/21/2016 96 --- 40.7 42.8 46.2 -0.04 0.05 0.15 -0.76 16.3 18.1 20.3 A
9/22/2016 96 --- 42.0 43.4 46.9 -0.16 -0.10 -0.02 -0.76 13.8 15.2 16.8 A
9/23/2016 96 --- 41.3 43.0 45.5 -0.24 -0.20 -0.14 -0.76 12.3 13.0 14.2 A
9/24/2016 96 --- 42.6 43.8 46.6 -0.30 -0.26 -0.22 -0.76 10.9 11.7 12.6 A
9/25/2016 96 --- 41.5 43.1 45.5 -0.37 -0.33 -0.29 -0.76 9.5 10.3 11.2 A
9/26/2016 96 --- 42.9 44.0 45.7 -0.37 -0.33 -0.26 -0.76 9.5 10.2 11.8 A
9/27/2016 96 --- 43.1 44.6 46.2 -0.40 -0.38 -0.34 -0.76 8.8 9.3 10.1 A
9/28/2016 96 --- 42.6 44.5 47.7 -0.43 -0.41 -0.38 -0.76 8.0 8.6 9.3 A
9/29/2016 96 --- 44.2 45.6 47.5 -0.47 -0.35 0.57 -0.76 7.2 9.8 28.4 A
9/30/2016 96 --- 47.3 48.7 50.5 0.23 0.58 1.18 -0.76 21.8 28.5 39.9 A:e
10/1/2016 96 --- 42.6 45.0 47.3 0.28 0.51 0.88 -0.76 22.7 27.2 34.3 A
10/2/2016 96 --- 42.6 44.1 45.7 0.06 0.19 0.40 -0.76 18.4 21.1 25.2 A
10/3/2016 96 --- 41.1 43.2 46.8 -0.06 0.03 0.18 -0.76 15.9 17.7 20.8 A
10/4/2016 96 --- 43.5 44.1 45.3 -0.15 -0.08 -0.02 -0.76 14.1 15.5 16.8 A
10/5/2016 96 --- 43.1 44.7 46.9 -0.21 -0.15 -0.07 -0.76 12.8 14.0 15.8 A
10/6/2016 96 --- 46.9 47.3 47.8 -0.13 -0.04 0.07 -0.76 14.6 16.3 18.7 A
10/7/2016 96 --- 45.5 47.3 48.4 -0.05 0.23 0.79 -0.76 16.2 21.7 32.6 A
10/8/2016 96 --- 42.8 45.5 46.8 0.34 0.66 1.16 -0.76 24.0 30.2 39.5 A
10/9/2016 96 --- 42.0 43.5 44.8 0.10 0.21 0.35 -0.76 19.1 21.3 24.2 A
10/10/2016 96 --- 43.3 44.8 46.4 0.03 0.16 0.61 -0.76 17.8 20.5 29.2 A
10/11/2016 96 --- 44.9 45.5 46.4 0.06 0.14 0.31 -0.76 18.4 20.0 23.4 A
10/12/2016 96 --- 44.0 45.1 46.8 0.00 0.06 0.18 -0.76 17.1 18.5 20.8 A
10/13/2016 96 --- 43.1 44.5 46.0 -0.08 -0.02 0.07 -0.76 15.5 16.8 18.6 A
10/14/2016 96 --- 41.8 43.4 45.1 -0.12 -0.08 -0.03 -0.76 14.6 15.4 16.5 A
10/15/2016 96 --- 42.6 43.7 46.4 -0.25 -0.01 0.20 -0.76 12.0 17.1 21.2 A
10/16/2016 96 --- 40.2 42.4 44.0 -0.08 0.24 0.52 -0.76 15.6 21.9 27.4 A
10/17/2016 96 --- 36.6 38.3 40.2 0.14 0.44 0.59 -0.76 20.1 25.9 28.8 A
10/18/2016 96 --- 34.6 35.9 36.9 -0.32 -0.03 0.63 -0.76 10.5 16.5 29.6 A
10/19/2016 96 --- 34.6 39.0 41.1 -0.38 -0.18 0.06 -0.76 9.3 13.5 18.5 A
10/20/2016 96 --- 39.4 40.3 41.6 -0.12 0.22 0.52 -0.76 14.7 21.7 27.4 A
10/21/2016 96 --- 38.3 39.3 41.1 0.13 0.59 0.96 -0.76 19.8 28.8 35.8 A
10/22/2016 96 --- 37.1 38.5 40.2 0.24 0.79 1.46 -0.91 27.2 35.6 46.9 A:e
10/23/2016 96 --- 37.9 40.8 43.1 -0.35 -0.12 0.43 -1.03 15.5 20.2 30.8 A
10/24/2016 96 --- 40.3 41.5 43.3 -0.31 0.05 0.52 -1.03 16.3 23.5 32.6 A
10/25/2016 96 --- 40.3 42.4 44.2 -0.55 -0.23 0.26 -1.03 11.4 18.0 27.7 A
10/26/2016 96 --- 38.8 40.8 42.6 -0.66 -0.26 0.15 -1.03 9.0 17.3 25.5 A
10/27/2016 96 --- 37.9 39.8 42.9 -0.52 -0.01 0.73 -1.03 11.9 22.2 36.6 A
10/28/2016 96 --- 40.3 43.6 45.5 -0.75 -0.63 -0.49 -1.03 6.9 9.6 12.7 A
10/29/2016 96 --- 39.8 40.4 41.3 -------A:e
10/30/2016 96 --- 39.0 40.4 41.1 -------A:e
10/31/2016 96 --- 38.8 39.8 40.9 -------A:e
11/1/2016 96 --- 38.1 39.3 40.0 -------A:e
11/2/2016 96 --- 36.7 37.5 38.3 -------A:e
11/3/2016 96 --- 35.4 36.3 37.3 -------A:e
11/4/2016 96 --- 35.2 35.9 36.7 -------A:e
11/5/2016 96 --- 35.2 36.3 37.5 -------A:e
11/6/2016 100 --- 35.8 36.6 37.3 -------A:e
11/7/2016 96 --- 35.2 36.1 36.9 -------A:e
11/8/2016 96 --- 36.7 37.3 38.3 -------A:e
11/9/2016 96 --- 38.1 38.8 39.6 -------A:e
11/10/2016 96 --- 35.6 36.4 38.5 -------A:e
11/11/2016 96 --- 35.4 35.8 37.1 -------A:e
11/12/2016 96 --- 35.0 35.9 36.9 -------A:e
11/13/2016 96 --- 36.7 37.9 39.2 -------A:e
11/14/2016 96 --- 33.2 34.4 36.6 -------A:e
11/15/2016 96 --- 34.2 35.3 36.2 -------A:e
11/16/2016 96 --- 34.8 35.2 35.8 -------A:e
12/3/2021
Daily, _SfkHydrology.xlsx
Page 1 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
11/17/2016 96 --- 35.0 36.1 37.3 -------A:e
11/18/2016 96 --- 35.8 36.8 37.7 -------A:e
11/19/2016 96 --- 35.6 36.0 36.6 -------A:e
11/20/2016 96 --- 35.2 36.1 36.6 -------A:e
11/21/2016 96 --- 34.6 35.3 36.4 -------A
11/22/2016 96 --- 33.8 34.7 35.6 -0.80 -0.73 -0.59 -1.03 5.9 7.5 10.5 A
11/23/2016 96 --- 34.2 35.4 36.6 -0.89 -0.73 -0.49 -1.03 3.8 7.5 12.7 A
11/24/2016 96 --- 34.6 35.8 37.5 -0.84 -0.81 -0.77 -1.03 4.9 5.7 6.5 A
11/25/2016 96 --- 35.4 35.9 36.9 -0.84 -0.81 -0.76 -1.03 4.9 5.5 6.7 A
11/26/2016 96 --- 34.2 35.5 36.9 -0.75 -0.38 -0.17 -1.03 7.1 15.0 19.2 A
11/27/2016 96 --- 34.4 35.2 36.6 -0.62 -0.55 -0.44 -1.03 9.8 11.4 13.6 A
11/28/2016 96 --- 34.6 35.5 36.4 -0.67 -0.63 -0.58 -1.03 8.8 9.7 10.6 A
11/29/2016 96 --- 32.6 35.4 36.9 -0.70 -0.67 -0.63 -1.03 8.1 8.8 9.6 A
11/30/2016 96 --- 34.4 35.8 37.3 -0.69 -0.66 -0.59 -1.03 8.2 9.1 10.4 A
12/1/2016 96 --- 32.2 33.1 34.8 -0.75 -0.72 -0.68 -1.03 7.0 7.8 8.6 A
12/2/2016 96 --- 31.8 33.2 34.4 -0.78 -0.75 -0.72 -1.03 6.3 6.9 7.7 A
12/3/2016 96 --- 33.6 34.5 35.6 -0.83 -0.79 -0.75 -1.03 5.2 6.1 6.9 A
12/4/2016 96 --- 34.6 35.7 36.6 -0.82 -0.77 -0.56 -1.03 5.4 6.5 11.1 A
12/5/2016 96 --- 34.0 35.0 35.8 -0.75 -0.63 -0.46 -1.03 7.0 9.6 13.4 A
12/6/2016 96 --- 32.4 34.5 35.4 -0.80 -0.76 -0.72 -1.03 5.8 6.8 7.7 A
12/7/2016 96 --- 31.8 32.1 32.4 -0.83 -0.80 -0.77 -1.03 5.2 5.9 6.6 A
12/8/2016 96 --- 32.0 32.7 33.6 -0.85 -0.83 -0.80 -1.03 4.8 5.2 5.9 A
12/9/2016 96 --- 32.2 33.3 33.6 -0.87 -0.85 -0.83 -1.03 4.2 4.7 5.2 A
12/10/2016 96 --- 33.2 34.0 35.0 -0.89 -0.87 -0.85 -1.03 3.8 4.2 4.8 A
12/11/2016 96 --- 33.4 34.5 35.2 -0.92 -0.89 -0.87 -1.03 3.1 3.8 4.3 A
12/12/2016 96 --- 33.0 34.5 35.8 -0.92 -0.65 -0.41 -1.03 3.1 9.1 14.3 A
12/13/2016 96 --- 33.8 35.1 36.2 -0.67 -0.18 0.59 -1.03 8.8 18.8 34.0 A
12/14/2016 96 --- 33.8 35.5 36.7 -0.27 0.06 0.65 -1.19 20.8 26.9 36.4 A
12/15/2016 96 --- 33.2 36.0 36.7 -0.41 -0.30 0.09 -1.21 18.0 20.2 27.9 A
12/16/2016 96 --- 35.4 35.7 36.0 -0.41 -0.24 0.16 -1.21 18.0 21.4 29.1 A
12/17/2016 96 --- 34.0 35.3 36.6 -0.50 -0.46 -0.37 -1.21 16.1 17.1 18.8 A
12/18/2016 96 --- 35.6 36.0 36.9 -0.61 -0.55 -0.46 -1.21 14.0 15.2 17.0 A
12/19/2016 96 --- 35.6 36.2 37.1 -0.66 -0.62 -0.58 -1.21 12.8 13.6 14.5 A
12/20/2016 96 --- 33.2 34.8 36.2 -0.73 -0.65 -0.52 -1.21 11.3 13.1 15.7 A
12/21/2016 96 --- 33.0 34.1 35.4 -0.77 -0.72 -0.66 -1.21 10.5 11.6 12.9 A:e
12/22/2016 96 --- 33.2 33.9 34.6 -0.82 -0.77 -0.72 -1.21 9.4 10.5 11.6 A
12/23/2016 96 --- 33.2 34.5 35.4 -0.85 -0.79 -0.70 -1.21 8.7 10.1 11.9 A
12/24/2016 96 --- 33.2 35.3 36.2 -0.72 -0.54 -0.42 -1.21 11.6 15.4 17.7 A
12/25/2016 96 --- 33.8 34.9 35.8 -0.71 -0.62 -0.38 -1.21 11.8 13.7 18.7 A
12/26/2016 96 --- 32.6 34.0 35.0 -0.78 -0.73 -0.68 -1.21 10.3 11.4 12.5 A
12/27/2016 96 --- 32.4 34.5 35.6 -0.79 -0.75 -0.69 -1.21 10.1 11.0 12.2 A
12/28/2016 96 --- 32.8 34.4 35.8 -0.81 -0.78 -0.74 -1.21 9.6 10.2 11.1 A
12/29/2016 96 --- 34.8 36.3 38.1 -0.83 -0.70 -0.51 -1.21 9.2 12.0 15.9 A
12/30/2016 96 --- 33.8 34.4 35.4 -0.76 -0.70 -0.61 -1.21 10.7 12.0 13.9 A
12/31/2016 96 --- 35.4 35.8 36.9 -0.77 -0.32 0.12 -1.21 10.5 19.6 28.5 A
1/1/2017 96 --- 35.6 36.0 36.4 -0.12 0.10 0.45 -1.21 23.8 28.0 34.6 A
1/2/2017 96 --- 36.0 36.5 36.7 0.22 0.30 0.40 -1.21 30.3 31.9 33.8 A
1/3/2017 96 --- 36.7 37.1 37.3 0.04 0.20 0.29 -1.21 26.9 29.9 31.6 A
1/4/2017 96 --- 36.2 37.1 37.9 -0.20 -0.07 0.08 -1.21 22.2 24.7 27.6 A
1/5/2017 96 --- 35.4 36.0 36.4 -0.42 -0.30 -0.15 -1.21 17.9 20.3 23.1 A
1/6/2017 96 --- 34.0 34.7 35.4 -0.53 -0.45 -0.37 -1.21 15.6 17.2 18.8 A
1/7/2017 96 --- 33.6 34.0 34.4 -0.67 -0.54 -0.46 -1.21 12.7 15.3 17.0 A
1/8/2017 96 --- 33.6 34.8 36.0 -0.71 -0.63 -0.57 -1.21 11.8 13.5 14.8 A
1/9/2017 96 --- 32.6 33.3 34.0 -0.74 -0.68 -0.62 -1.21 11.2 12.4 13.7 A
1/10/2017 96 --- 32.2 32.7 33.4 -0.78 -0.73 -0.69 -1.21 10.3 11.3 12.1 A
1/11/2017 96 --- 32.0 33.0 33.6 -0.80 -0.78 -0.75 -1.21 9.8 10.4 10.9 A
1/12/2017 96 --- 31.8 32.6 33.0 -0.84 -0.81 -0.78 -1.21 9.1 9.6 10.3 A
1/13/2017 96 --- 31.8 32.1 32.6 -0.90 -0.86 -0.83 -1.21 7.6 8.5 9.3 A
1/14/2017 96 --- 31.8 31.9 32.0 -0.90 -0.87 -0.84 -1.21 7.7 8.3 8.9 A
1/15/2017 96 --- 31.8 32.0 32.0 -0.90 -0.89 -0.88 -1.21 7.6 7.9 8.2 A
1/16/2017 96 --- 31.8 32.1 32.2 -0.92 -0.91 -0.89 -1.21 7.1 7.5 7.9 A
1/17/2017 96 --- 32.4 32.6 32.8 -0.94 -0.92 -0.91 -1.21 6.8 7.2 7.4 A
1/18/2017 96 --- 32.4 32.9 33.2 -0.96 -0.94 -0.92 -1.21 6.2 6.8 7.2 A
1/19/2017 96 --- 32.6 33.1 33.4 -0.97 -0.95 -0.94 -1.21 6.2 6.5 6.8 A
1/20/2017 96 --- 32.8 32.9 33.4 -0.98 -0.96 -0.95 -1.21 6.0 6.2 6.5 A
1/21/2017 96 --- 32.8 33.1 33.2 -0.99 -0.97 -0.96 -1.21 5.7 6.0 6.2 A
1/22/2017 96 --- 31.6 32.6 33.4 -1.00 -0.98 -0.98 -1.21 5.5 5.8 5.9 A:e
1/23/2017 96 --- 32.0 32.3 32.8 -0.98 -0.94 -0.88 -1.21 5.8 6.8 8.1 A:e
1/24/2017 96 --- 32.8 33.6 34.0 -0.99 -0.96 -0.92 -1.21 5.6 6.3 7.3 A
1/25/2017 96 --- 31.8 33.4 33.8 -1.01 -1.00 -0.98 -1.21 5.1 5.5 5.8 A:e
1/26/2017 96 --- 31.8 31.9 32.0 -1.02 -1.00 -0.99 -1.21 5.0 5.3 5.7 A:e
1/27/2017 96 --- 31.8 32.4 32.8 -1.03 -1.02 -1.01 -1.21 4.7 5.0 5.2 A
1/28/2017 96 --- 32.8 33.2 33.6 -1.03 -1.03 -1.02 -1.21 4.6 4.8 5.0 A
1/29/2017 96 --- 32.4 33.2 33.6 -1.05 -1.02 -0.89 -1.21 4.2 4.9 8.0 A
1/30/2017 96 --- 31.8 32.8 33.8 -0.91 -0.79 -0.63 -1.21 7.4 10.1 13.6 A
1/31/2017 96 --- 33.2 33.8 34.2 -0.99 -0.95 -0.90 -1.21 5.7 6.6 7.7 A
2/1/2017 96 --- 33.2 34.0 34.8 -1.01 -0.99 -0.95 -1.21 5.1 5.5 6.5 A
2/2/2017 96 --- 34.0 34.4 34.6 -1.03 -1.01 -1.00 -1.21 4.8 5.1 5.5 A
2/3/2017 96 --- 34.2 34.4 34.8 -1.01 -0.99 -0.98 -1.21 5.2 5.6 5.9 A
2/4/2017 96 --- 34.2 34.4 34.8 -1.02 -1.01 -0.99 -1.21 4.9 5.3 5.7 A
2/5/2017 96 --- 34.0 34.5 35.4 -1.04 -1.02 -1.01 -1.21 4.5 4.9 5.3 A
2/6/2017 96 --- 32.8 33.3 34.0 -1.05 -1.03 -1.02 -1.21 4.3 4.7 5.0 A
2/7/2017 96 --- 33.2 34.2 35.2 -1.06 -1.05 -1.03 -1.21 4.1 4.3 4.6 A
2/8/2017 96 --- 33.6 34.5 35.4 -1.07 -1.05 -1.04 -1.21 3.7 4.2 4.4 A
2/9/2017 96 --- 32.2 32.9 33.6 -1.06 -1.06 -1.05 -1.21 3.9 4.1 4.3 A
2/10/2017 96 --- 31.6 31.8 32.2 -1.08 -1.07 -1.05 -1.21 3.4 3.9 4.1 A
2/11/2017 96 --- 31.6 31.8 32.0 -1.08 -1.07 -1.06 -1.21 3.6 3.8 4.1 A
2/12/2017 96 --- 31.6 31.8 32.0 -1.09 -1.08 -1.06 -1.21 3.3 3.6 3.9 A
2/13/2017 96 --- 31.6 31.7 31.8 -1.10 -1.08 -1.07 -1.21 3.1 3.4 3.8 A
2/14/2017 96 --- 31.8 32.2 32.6 -1.10 -1.09 -1.08 -1.21 2.9 3.1 3.4 A
2/15/2017 96 --- 32.2 32.5 32.6 -1.11 -1.10 -1.09 -1.21 2.8 3.0 3.2 A
2/16/2017 96 --- 32.4 32.7 32.8 -1.11 -1.10 -1.10 -1.21 2.7 2.9 3.1 A
12/3/2021
Daily, _SfkHydrology.xlsx
Page 2 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
2/17/2017 96 --- 32.6 33.0 33.2 -1.11 -1.11 -1.10 -1.21 2.7 2.8 3.0 A
2/18/2017 96 --- 32.4 32.8 33.2 -1.12 -1.11 -1.10 -1.21 2.5 2.8 2.9 A
2/19/2017 96 --- 31.8 32.2 32.6 -1.12 -1.11 -1.10 -1.21 2.5 2.8 2.9 A
2/20/2017 96 --- 31.6 32.1 32.6 -1.12 -1.11 -1.10 -1.21 2.5 2.7 3.0 A
2/21/2017 96 --- 31.6 31.8 32.2 -1.11 -0.98 -0.91 -1.21 2.8 5.8 7.5 A:e
2/22/2017 96 --- 32.2 33.2 34.0 -1.05 -0.98 -0.86 -1.21 4.3 5.9 8.6 A
2/23/2017 96 --- 31.6 32.5 34.0 -0.93 -0.42 0.07 -1.21 6.9 17.7 27.5 A
2/24/2017 96 --- 33.0 33.9 35.6 -0.82 -0.74 -0.59 -1.21 9.4 11.2 14.4 A
2/25/2017 96 --- 33.0 33.9 35.6 -0.91 -0.87 -0.81 -1.21 7.5 8.4 9.7 A
2/26/2017 96 --- 33.2 34.4 36.4 -0.95 -0.92 -0.89 -1.21 6.6 7.1 7.8 A
2/27/2017 96 --- 33.0 34.4 35.8 -0.99 -0.95 -0.93 -1.21 5.6 6.6 6.9 A
2/28/2017 96 --- 31.8 32.3 32.8 -0.99 -0.97 -0.94 -1.21 5.6 6.1 6.7 A
3/1/2017 96 --- 31.8 31.9 32.2 -1.00 -0.98 -0.96 -1.21 5.4 5.8 6.3 A
3/2/2017 96 --- 31.8 32.0 32.4 -1.01 -1.00 -0.98 -1.21 5.2 5.4 5.7 A
3/3/2017 96 --- 32.0 32.3 32.8 -1.02 -1.01 -1.00 -1.21 5.0 5.2 5.5 A
3/4/2017 96 --- 32.0 32.9 33.8 -1.04 -1.03 -1.00 -1.21 4.4 4.8 5.3 A
3/5/2017 96 --- 33.0 33.9 34.8 -1.06 -1.04 -1.02 -1.21 4.0 4.4 4.8 A
3/6/2017 96 --- 33.2 34.1 35.4 -1.10 -1.05 -1.03 -1.21 3.1 4.2 4.8 A
3/7/2017 96 --- 31.8 32.6 33.6 -1.08 -1.06 -1.04 -1.21 3.5 4.1 4.5 A
3/8/2017 97 --- 31.8 32.3 33.4 -1.07 -1.06 -1.05 -1.21 3.7 3.9 4.2 A
3/9/2017 96 --- 31.6 32.0 32.6 -1.09 -1.07 -1.02 -1.21 3.3 3.7 4.9 A
3/10/2017 96 --- 31.6 32.0 32.6 -1.09 -1.08 -1.06 -1.21 3.3 3.6 4.0 A
3/11/2017 96 --- 31.8 32.3 33.0 -1.10 -1.09 -1.08 -1.21 3.1 3.4 3.6 A
3/12/2017 92 --- 31.6 32.2 33.0 -1.11 -1.10 -1.08 -1.21 2.9 3.1 3.4 A
3/13/2017 96 --- 31.8 32.3 33.0 -1.12 -1.10 -1.09 -1.21 2.6 2.9 3.3 A
3/14/2017 96 --- 31.6 32.2 33.0 -1.12 -1.11 -1.10 -1.21 2.4 2.8 3.0 A
3/15/2017 24 --- 31.6 31.7 31.8 -1.12 -1.11 -1.11 -1.21 2.5 2.7 2.8 A
GAP IN RECORD DUE TO EQUIPMENT FAILURE (Note 6)
8/23/2017 45 50.8 61.3 74.4 48.0 58.2 80.7 -0.99 -0.97 -0.95 -1.21 5.6 6.0 6.5A
8/24/2017 48 44.4 49.2 52.9 45.8 47.6 49.1 -1.00 -0.92 -0.84 -1.21 5.4 7.1 9.1A
8/25/2017 48 43.5 46.4 55.4 44.2 45.5 47.6 -0.92 -0.87 -0.80 -1.21 7.2 8.3 9.8A
8/26/2017 48 43.5 46.3 50.5 43.8 45.4 48.2 -0.89 -0.86 -0.83 -1.21 7.9 8.6 9.1A
8/27/2017 48 38.4 46.6 56.2 42.4 44.6 47.4 -0.92 -0.89 -0.86 -1.21 7.2 7.8 8.6A
8/28/2017 48 43.1 47.2 54.3 43.8 45.4 48.2 -0.94 -0.92 -0.90 -1.21 6.8 7.2 7.8A
8/29/2017 48 45.1 47.3 50.3 44.6 45.5 46.9 -0.94 -0.81 -0.69 -1.21 6.7 9.6 12.2 A
8/30/2017 48 44.9 48.5 53.4 44.2 45.7 48.0 -0.88 -0.84 -0.76 -1.21 8.2 9.0 10.6 A
8/31/2017 48 40.9 46.3 54.5 42.2 44.3 47.3 -0.89 -0.87 -0.81 -1.21 7.8 8.4 9.7A
9/1/2017 48 42.9 47.5 55.0 43.6 45.1 47.3 -0.93 -0.89 -0.86 -1.21 7.0 7.8 8.6 A
9/2/2017 48 45.3 47.0 48.9 44.6 45.1 45.6 -0.91 -0.81 -0.62 -1.21 7.5 9.7 13.7A
9/3/2017 48 46.0 47.6 48.7 44.7 45.4 46.2 -0.72 -0.54 -0.28 -1.21 11.6 15.3 20.7 A
9/4/2017 48 47.4 48.6 50.6 45.5 45.7 46.2 -0.54 -0.41 -0.21 -1.21 15.4 18.0 22.0 A
9/5/2017 48 44.9 51.1 58.0 44.4 46.1 48.5 -0.66 -0.60 -0.53 -1.21 12.9 14.0 15.5 A
9/6/2017 48 45.3 47.7 49.4 44.2 45.2 46.0 -0.71 -0.61 -0.37 -1.21 11.8 13.9 18.8 A
9/7/2017 48 46.5 49.1 55.5 44.9 45.9 47.8 -0.64 -0.58 -0.40 -1.21 13.2 14.6 18.1 A
9/8/2017 48 45.3 48.9 55.7 43.8 45.4 48.0 -0.72 -0.67 -0.63 -1.21 11.6 12.6 13.4 A
9/9/2017 48 43.1 46.4 54.1 43.1 44.7 46.4 -0.74 -0.69 -0.61 -1.21 11.1 12.2 13.8 A
9/10/2017 48 45.6 48.8 53.3 44.4 45.8 48.3 -0.71 -0.66 -0.60 -1.21 11.9 12.9 14.1 A
9/11/2017 48 42.7 49.0 53.8 43.8 45.6 47.4 -0.75 -0.72 -0.67 -1.21 10.9 11.6 12.7 A
9/12/2017 48 49.6 52.5 55.2 46.4 47.6 49.4 -0.77 -0.71 -0.63 -1.21 10.5 11.8 13.5 A
9/13/2017 48 45.6 48.9 53.6 44.6 46.1 48.0 -0.77 -0.75 -0.73 -1.21 10.4 10.9 11.4 A
9/14/2017 48 44.9 48.3 53.6 44.7 45.8 48.0 -0.79 -0.76 -0.69 -1.21 10.0 10.7 12.2 A
9/15/2017 48 43.5 47.8 52.9 43.8 45.7 47.8 -0.78 -0.15 0.39 -1.21 10.2 23.1 33.6 A
9/16/2017 48 42.5 44.0 46.9 42.5 43.1 43.6 -0.39 -0.20 0.06 -1.21 18.5 22.3 27.2 A
9/17/2017 48 42.4 44.8 50.3 41.1 42.6 44.7 -0.34 -0.22 0.05 -1.21 19.3 21.8 27.2 A
9/18/2017 48 38.3 44.6 51.7 41.1 42.4 44.9 -0.49 -0.43 -0.35 -1.21 16.3 17.6 19.3 A
9/19/2017 48 32.0 42.2 52.4 39.9 42.2 45.8 -0.60 -0.55 -0.49 -1.21 14.0 15.2 16.4 A
9/20/2017 48 42.4 46.7 51.5 42.4 44.1 46.2 -0.60 -0.27 0.19 -1.21 14.0 20.7 29.8 A
9/21/2017 48 46.4 48.5 51.3 44.7 45.3 46.0 -0.44 -0.40 -0.31 -1.21 17.3 18.3 20.0 A
9/22/2017 48 41.1 44.8 47.8 42.2 43.7 44.7 -0.46 -0.40 -0.33 -1.21 17.0 18.1 19.6 A
9/23/2017 48 40.1 42.1 45.8 41.3 42.2 43.6 -0.52 -0.48 -0.42 -1.21 15.7 16.6 17.9 A
9/24/2017 48 38.8 42.8 48.5 40.5 41.9 43.8 -0.60 -0.55 -0.50 -1.21 14.1 15.2 16.2 A
9/25/2017 48 41.6 44.0 49.1 41.8 42.8 45.5 -0.64 -0.60 -0.57 -1.21 13.4 14.1 14.8 A
9/26/2017 48 35.0 42.6 48.0 40.5 42.1 43.8 -0.70 -0.65 -0.61 -1.21 12.1 13.0 13.8 A
9/27/2017 48 42.2 44.0 46.5 41.8 42.4 43.5 -0.73 -0.70 -0.67 -1.21 11.4 11.9 12.6 A
9/28/2017 48 41.4 43.0 44.7 41.1 42.0 43.1 -0.75 -0.71 -0.66 -1.21 10.9 11.8 12.8 A
9/29/2017 48 37.5 41.1 44.0 39.8 41.5 42.9 -0.74 -0.71 -0.66 -1.21 11.1 11.7 12.7 A
9/30/2017 48 34.4 42.3 48.7 39.2 41.0 44.6 -0.79 -0.76 -0.73 -1.21 10.0 10.7 11.3 A
10/1/2017 48 31.6 40.9 46.5 39.6 41.4 43.5 -0.81 -0.78 -0.71 -1.21 9.7 10.4 11.8 A
10/2/2017 48 41.1 44.4 49.9 40.9 42.3 44.6 -0.82 -0.79 -0.75 -1.21 9.4 10.2 11.0 A
10/3/2017 48 41.6 44.8 49.2 41.1 42.4 44.2 -0.85 -0.82 -0.79 -1.21 8.8 9.4 10.1 A
10/4/2017 48 38.3 46.8 54.1 41.8 43.8 45.8 -0.84 -0.68 -0.36 -1.21 9.0 12.4 19.0 A
10/5/2017 48 44.0 48.1 51.5 42.4 43.2 44.7 -0.80 -0.75 -0.69 -1.21 9.9 11.0 12.2 A
10/6/2017 48 43.3 47.3 53.1 41.4 42.9 45.5 -0.82 -0.80 -0.75 -1.21 9.5 9.9 10.9 A
10/7/2017 48 39.8 44.0 50.6 40.9 43.0 45.6 -0.81 -0.55 -0.08 -1.21 9.7 15.1 24.5 A
10/8/2017 48 39.9 42.7 47.1 40.3 41.4 43.1 -0.62 -0.55 -0.45 -1.21 13.7 15.0 17.2 A
10/9/2017 48 32.0 41.2 52.8 38.4 40.8 44.0 -0.69 -0.65 -0.60 -1.21 12.3 13.1 14.1 A
10/10/2017 48 34.8 43.5 52.1 39.4 41.4 44.2 -0.75 -0.72 -0.68 -1.21 10.9 11.712.5 A
10/11/2017 48 46.2 48.6 50.8 42.7 44.8 46.5 -0.76 -0.32 1.11 -1.21 10.7 19.6 47 A:e
10/12/2017 48 40.1 47.3 55.0 41.3 44.0 45.8 -0.20 0.02 0.53 -1.21 22.2 26.4 36.1 A
10/13/2017 48 33.0 39.6 48.5 39.4 40.8 42.4 -0.38 -0.30 -0.20 -1.21 18.6 20.222.3 A
10/14/2017 48 38.8 41.2 45.8 40.1 41.0 42.5 -0.32 -0.22 -0.10 -1.21 19.7 21.724.3 A
10/15/2017 48 34.0 39.4 45.1 39.0 40.3 41.8 -0.45 -0.37 -0.30 -1.21 17.3 18.820.2 A
10/16/2017 48 32.0 38.7 46.5 38.4 39.7 41.8 -0.53 -0.48 -0.41 -1.21 15.5 16.618.0 A
10/17/2017 48 37.1 39.4 42.0 38.3 39.4 40.5 -0.45 -0.31 -0.13 -1.21 17.2 20.023.5 A
10/18/2017 48 35.8 38.4 42.7 37.1 38.3 39.4 -0.47 -0.42 -0.33 -1.21 16.9 17.819.7 A
10/19/2017 48 32.8 37.0 42.4 36.3 37.7 39.6 -0.56 -0.52 -0.44 -1.21 14.8 15.817.3 A
10/20/2017 48 32.8 34.8 37.1 36.7 37.7 39.0 -0.64 -0.59 -0.55 -1.21 13.2 14.215.1 A
10/21/2017 48 30.8 33.0 37.9 33.6 35.2 36.5 -0.73 -0.66 -0.61 -1.21 11.5 12.713.8 A
10/22/2017 48 23.9 30.6 38.4 34.4 35.4 37.3 -0.77 -0.73 -0.69 -1.21 10.4 11.312.1 A
10/23/2017 48 23.2 30.8 39.2 34.0 34.9 36.7 -0.83 -0.80 -0.77 -1.21 9.2 9.9 10.6 A
12/3/2021
Daily, _SfkHydrology.xlsx
Page 3 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
10/24/2017 48 21.4 36.1 43.6 34.0 35.4 36.9 -0.90 -0.52 0.27 -1.21 7.6 15.5 31.3 A
10/25/2017 48 41.8 44.1 47.1 37.1 39.1 40.7 -0.46 -0.36 -0.16 -1.21 17.1 19.122.9 A
10/26/2017 48 39.8 42.4 46.7 39.0 39.6 40.5 -0.48 -0.37 -0.20 -1.21 16.5 18.822.1 A
10/27/2017 48 32.0 40.9 45.1 37.5 39.2 40.3 -0.57 -0.53 -0.45 -1.21 14.7 15.617.2 A
10/28/2017 48 40.3 42.0 44.2 39.8 40.1 40.3 -0.58 -0.46 -0.34 -1.21 14.5 17.019.4 A
10/29/2017 48 42.2 45.2 47.1 39.8 41.4 42.4 -0.33 -0.08 0.38 -1.21 19.5 24.6 33.4 A
10/30/2017 48 40.9 44.2 46.7 39.8 41.0 41.6 -0.30 -0.16 0.00 -1.21 20.1 23.0 26.2 A
10/31/2017 48 33.0 39.7 45.5 38.1 39.4 41.1 -0.49 -0.41 -0.31 -1.21 16.4 18.020.0 A
11/1/2017 48 30.8 38.0 43.8 37.9 39.1 40.7 -0.62 -0.55 -0.48 -1.21 13.7 15.2 16.5 A
11/2/2017 48 30.8 36.9 46.0 37.7 38.7 40.1 -0.70 -0.65 -0.59 -1.21 12.0 13.0 14.3 A
11/3/2017 48 26.9 35.3 44.0 36.1 37.7 39.4 -0.76 -0.73 -0.69 -1.21 10.6 11.4 12.1 A
11/4/2017 48 37.5 41.6 44.0 39.0 40.2 41.4 -0.79 -0.77 -0.73 -1.21 10.0 10.5 11.3 A
11/5/2017 48 37.5 39.1 41.8 37.1 38.5 39.4 -0.84 -0.79 -0.73 -1.21 9.1 10.0 11.3 A
11/6/2017 48 29.4 36.5 45.3 35.8 36.7 37.9 -0.88 -0.85 -0.82 -1.21 8.2 8.7 9.5A
11/7/2017 48 33.2 39.7 44.6 36.7 38.6 40.5 -0.91 -0.89 -0.86 -1.21 7.4 8.0 8.5A
11/8/2017 48 32.8 39.4 44.7 37.1 37.7 38.8 -0.94 -0.92 -0.90 -1.21 6.7 7.2 7.7A
11/9/2017 48 35.6 38.5 44.0 36.7 37.8 39.0 -0.95 -0.92 -0.87 -1.21 6.6 7.2 8.4A
11/10/2017 48 36.1 40.4 44.4 36.7 37.9 39.6 -0.96 -0.93 -0.91 -1.21 6.3 6.9 7.4 A
11/11/2017 48 33.0 42.4 45.8 38.1 39.3 40.5 -0.98 -0.96 -0.93 -1.21 5.8 6.3 7.0 A
11/12/2017 48 31.6 38.8 44.2 36.5 37.6 38.8 -1.00 -0.99 -0.97 -1.21 5.5 5.7 6.1 A
11/13/2017 48 37.3 40.0 43.5 38.4 38.8 39.8 -1.01 -0.99 -0.96 -1.21 5.1 5.6 6.3 A
11/14/2017 48 30.6 37.3 46.4 36.3 37.9 39.6 -1.03 -1.01 -0.99 -1.21 4.7 5.1 5.6 A
11/15/2017 48 37.1 40.5 46.0 37.9 39.3 40.7 -1.03 -0.94 -0.79 -1.21 4.7 6.8 10.1 A
11/16/2017 48 38.3 41.6 43.5 37.5 39.1 40.9 -0.96 -0.90 -0.82 -1.21 6.2 7.7 9.4 A
11/17/2017 48 39.2 40.6 42.9 36.9 38.1 39.2 -0.97 -0.94 -0.89 -1.21 6.1 6.7 7.8 A
11/18/2017 48 38.4 44.8 54.5 36.5 39.6 43.8 -0.98 -0.96 -0.93 -1.21 5.9 6.2 6.9 A
11/19/2017 48 35.6 38.2 39.9 35.8 37.4 42.5 -0.96 -0.88 -0.72 -1.21 6.3 8.1 11.5 A
11/20/2017 48 34.2 36.0 39.6 34.2 34.8 35.8 -0.97 -0.94 -0.90 -1.21 6.1 6.7 7.7 A
11/21/2017 48 32.4 37.1 43.1 34.6 35.5 37.1 -0.96 -0.89 -0.68 -1.21 6.3 7.8 12.5 A
11/22/2017 48 30.0 38.8 50.3 34.4 36.2 39.2 -0.95 -0.88 -0.78 -1.21 6.5 8.2 10.3 A
11/23/2017 48 32.0 34.8 36.7 32.4 33.3 35.2 -1.02 -0.92 -0.82 -1.21 4.9 7.2 9.3 A
11/24/2017 48 32.6 35.9 38.8 32.6 34.5 36.0 -0.96 -0.93 -0.88 -1.21 6.3 7.0 8.2 A
11/25/2017 48 31.6 38.0 44.0 35.0 35.8 36.9 -0.93 -0.77 -0.13 -1.21 7.1 10.4 23.5 A
11/26/2017 48 36.7 38.7 44.6 36.0 36.4 37.1 -0.56 -0.45 -0.15 -1.21 15.0 17.223.3 A
11/27/2017 48 34.8 38.2 43.1 35.4 36.6 38.1 -0.56 -0.25 0.19 -1.21 14.9 21.1 29.8 A
11/28/2017 48 31.4 37.0 42.7 36.0 37.1 38.6 -0.22 -0.02 0.15 -1.21 21.9 25.8 29.1 A
11/29/2017 48 32.0 36.4 39.6 36.3 37.4 38.1 -0.36 -0.30 -0.24 -1.21 19.0 20.321.4 A
11/30/2017 48 32.0 36.5 39.8 36.1 36.8 37.7 -0.50 -0.41 -0.31 -1.21 16.2 18.020.0 A
12/1/2017 48 35.4 41.4 45.6 36.5 38.2 39.2 -0.53 -0.23 0.13 -1.21 15.5 21.6 28.7 A
12/2/2017 48 32.2 37.0 41.1 36.3 37.2 37.9 -0.51 -0.42 -0.30 -1.21 16.0 17.7 20.3 A
12/3/2017 48 33.8 35.6 37.7 35.0 36.3 37.3 -0.63 -0.56 -0.50 -1.21 13.6 15.0 16.1 A
12/4/2017 48 23.2 30.4 34.4 33.6 34.2 35.0 -0.72 -0.66 -0.58 -1.21 11.6 12.8 14.5 A
12/5/2017 48 21.7 26.6 32.2 33.4 34.0 34.8 -0.78 -0.75 -0.71 -1.21 10.2 11.0 11.7 A
12/6/2017 48 24.5 33.2 37.5 34.0 35.3 36.1 -0.83 -0.81 -0.77 -1.21 9.2 9.7 10.4 A
12/7/2017 48 31.0 33.5 36.0 34.0 34.9 35.4 -0.87 -0.85 -0.82 -1.21 8.2 8.8 9.4A
12/8/2017 48 32.8 34.0 35.2 33.6 34.4 35.2 -0.92 -0.89 -0.85 -1.21 7.2 7.9 8.9A
12/9/2017 48 32.0 35.9 40.9 31.8 34.7 36.3 -0.86 -0.83 -0.78 -1.21 8.5 9.2 10.4 A
12/10/2017 48 31.4 34.4 36.5 35.2 35.9 36.7 -0.91 -0.88 -0.86 -1.21 7.5 8.1 8.6 A
12/11/2017 48 29.4 33.0 37.1 34.8 35.7 36.7 -0.96 -0.93 -0.89 -1.21 6.4 7.0 8.0 A
12/12/2017 48 34.8 36.6 39.6 34.8 35.8 36.9 -0.91 -0.85 -0.77 -1.21 7.5 8.7 10.4 A
12/13/2017 48 32.0 34.7 38.1 32.4 35.4 36.5 -0.93 -0.91 -0.88 -1.21 6.9 7.5 8.1 A
12/14/2017 48 30.0 33.0 36.1 32.0 34.3 35.2 -0.98 -0.93 -0.81 -1.21 5.8 6.9 9.5 A
12/15/2017 48 32.6 37.1 39.9 32.2 34.3 35.4 -0.88 -0.77 -0.61 -1.21 8.1 10.5 13.9 A
12/16/2017 48 29.8 33.5 36.7 32.8 33.9 35.0 -0.99 -0.90 -0.87 -1.21 5.7 7.6 8.4 A
12/17/2017 48 27.1 33.8 36.7 32.8 33.4 34.2 -0.97 -0.95 -0.91 -1.21 6.1 6.6 7.5 A
12/18/2017 48 32.4 37.9 40.5 33.2 34.7 35.8 -0.98 -0.71 0.24 -1.21 6.0 11.5 30.8 A
12/19/2017 48 26.9 34.0 40.1 32.8 34.3 35.2 -0.57 -0.31 0.31 -1.21 14.6 20.0 32.0 A
12/20/2017 48 26.2 36.2 40.5 34.4 35.2 36.0 -0.70 -0.63 -0.57 -1.21 12.1 13.414.7 A
12/21/2017 48 36.3 37.5 41.6 35.8 36.3 36.7 -0.70 -0.59 -0.40 -1.21 12.1 14.318.1 A
12/22/2017 48 31.8 35.9 41.6 32.6 34.9 36.7 -0.43 -0.24 0.01 -1.21 17.7 21.4 26.2 A
12/23/2017 48 30.4 31.9 33.0 32.2 33.5 34.6 -0.60 -0.51 -0.43 -1.21 14.2 15.917.6 A
12/24/2017 48 22.3 31.2 34.2 32.6 34.0 35.0 -0.70 -0.64 -0.57 -1.21 11.9 13.314.8 A
12/25/2017 48 22.3 28.4 33.8 34.0 34.8 36.0 -0.78 -0.74 -0.69 -1.21 10.3 11.312.2 A
12/26/2017 48 23.7 30.3 33.6 34.2 35.3 35.8 -0.85 -0.81 -0.76 -1.21 8.8 9.7 10.7 A
12/27/2017 48 28.8 31.0 32.6 34.2 34.7 35.8 -0.90 -0.86 -0.83 -1.21 7.8 8.5 9.2 A
12/28/2017 48 22.6 29.4 33.6 33.4 34.5 35.4 -0.94 -0.91 -0.88 -1.21 6.9 7.4 8.0 A
12/29/2017 48 32.8 35.0 36.7 34.6 35.1 35.8 -0.95 -0.93 -0.88 -1.21 6.5 7.1 8.2 A
12/30/2017 48 32.2 36.4 38.3 34.4 35.3 36.0 -0.87 -0.79 -0.72 -1.21 8.2 10.1 11.5 A
12/31/2017 48 32.8 35.5 36.9 34.4 35.0 35.8 -0.91 -0.86 -0.82 -1.21 7.4 8.5 9.5 A
1/1/2018 48 33.0 34.8 36.5 34.4 35.1 35.6 -0.90 -0.87 -0.84 -1.21 7.7 8.3 9.0 A
1/2/2018 48 26.0 31.7 34.2 33.2 34.2 35.0 -0.96 -0.92 -0.87 -1.21 6.3 7.1 8.3 A
1/3/2018 48 23.9 30.1 35.4 32.8 33.6 34.4 -1.00 -0.98 -0.96 -1.21 5.3 5.9 6.4 A
1/4/2018 48 34.6 37.0 39.9 34.2 35.4 36.7 -1.01 -0.91 -0.51 -1.21 5.1 7.5 16.0A
1/5/2018 48 31.6 38.0 41.1 34.2 35.1 35.6 -0.51 -0.16 0.03 -1.21 16.1 23.0 26.7 A
1/6/2018 48 30.2 35.0 40.3 35.0 35.7 36.9 -0.60 -0.52 -0.37 -1.21 14.1 15.8 18.7 A
1/7/2018 48 27.7 32.7 36.9 34.6 35.4 36.3 -0.70 -0.66 -0.60 -1.21 12.0 12.9 14.2 A
1/8/2018 48 34.4 36.7 39.0 35.2 35.8 36.3 -0.73 -0.67 -0.60 -1.21 11.3 12.7 14.0 A
1/9/2018 48 32.6 36.0 38.4 34.4 35.5 36.3 -0.77 -0.72 -0.64 -1.21 10.4 11.5 13.3 A
1/10/2018 48 34.0 36.6 38.3 34.8 36.0 36.5 -0.79 -0.75 -0.73 -1.21 10.1 10.9 11.4 A
1/11/2018 48 35.4 36.8 37.5 36.0 36.2 36.5 -0.78 -0.76 -0.74 -1.21 10.3 10.7 11.2 A
1/12/2018 48 31.8 36.1 39.0 35.8 36.2 36.9 -0.85 -0.82 -0.78 -1.21 8.8 9.5 10.4 A
1/13/2018 48 33.6 35.6 37.3 34.2 35.7 36.3 -0.85 -0.81 -0.75 -1.21 8.7 9.6 10.9 A
1/14/2018 48 32.0 35.1 38.6 35.2 35.7 36.9 -0.87 -0.82 -0.77 -1.21 8.3 9.4 10.4 A
1/15/2018 48 30.4 33.2 37.7 34.4 35.5 36.7 -0.91 -0.89 -0.86 -1.21 7.3 8.0 8.6A
1/16/2018 48 27.5 32.2 34.4 32.8 34.1 34.8 -0.95 -0.92 -0.90 -1.21 6.5 7.2 7.7A
1/17/2018 48 28.1 30.2 32.4 32.0 32.4 33.0 -0.97 -0.96 -0.94 -1.21 6.1 6.3 6.8A:e
1/18/2018 48 23.2 27.9 33.0 32.4 33.3 34.8 -1.00 -0.98 -0.95 -1.21 5.3 5.8 6.6A
1/19/2018 48 26.5 29.4 33.4 32.0 32.8 33.8 -1.03 -1.01 -0.98 -1.21 4.7 5.2 5.8A
1/20/2018 48 27.3 29.8 32.2 32.4 33.1 33.8 -1.05 -1.04 -1.01 -1.21 4.1 4.6 5.1A
1/21/2018 48 19.6 24.4 27.9 31.8 32.0 32.6 -1.08 -1.05 -1.02 -1.21 3.4 4.3 5.0A:e
1/22/2018 48 19.6 21.3 23.2 31.8 31.8 31.8 -1.10 -1.07 -1.07 -1.21 2.9 3.7 3.7A:e
1/23/2018 48 23.4 30.8 36.3 31.8 32.2 33.2 -1.11 -1.08 -1.05 -1.21 2.8 3.5 4.1A
12/3/2021
Daily, _SfkHydrology.xlsx
Page 4 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
1/24/2018 48 29.4 32.9 36.7 32.8 33.2 33.8 -1.13 -1.10 -1.08 -1.21 2.4 3.1 3.6A
1/25/2018 48 25.8 30.0 32.6 31.8 32.5 33.2 -1.13 -1.11 -1.10 -1.21 2.3 2.8 3.1A
1/26/2018 48 16.1 20.3 25.0 31.8 31.8 31.8 -1.11 -1.11 -1.11 -1.21 2.8 2.8 2.8A:e
1/27/2018 48 21.4 22.8 24.3 31.8 32.0 32.6 -1.16 -1.13 -1.11 -1.21 1.6 2.2 2.8A:e
1/28/2018 48 23.7 25.2 27.3 32.6 33.0 33.2 -1.16 -1.15 -1.13 -1.21 1.5 1.8 2.2A
1/29/2018 48 24.1 29.6 33.8 33.0 33.3 33.6 -1.17 -1.15 -1.13 -1.21 1.2 1.7 2.2A
1/30/2018 48 28.3 30.1 33.4 33.4 33.6 33.8 -1.18 -1.16 -1.15 -1.21 0.9 1.4 1.8A
1/31/2018 48 22.6 26.1 28.6 33.4 33.5 33.8 -1.18 -1.17 -1.16 -1.21 0.8 1.2 1.6A
2/1/2018 48 16.3 24.6 29.8 33.2 33.5 33.8 -1.19 -1.17 -1.16 -1.21 0.6 1.1 1.5 A
2/2/2018 48 17.5 32.8 38.8 33.2 33.6 33.8 -1.19 -1.18 -1.16 -1.21 0.6 1.1 1.5 A
2/3/2018 48 36.0 37.3 38.4 32.0 32.8 33.4 -1.18 -1.06 -0.78 -1.21 1.0 3.8 10.3A
2/4/2018 48 35.0 36.1 36.7 32.0 33.6 34.6 -0.79 -0.64 -0.57 -1.21 10.1 13.2 14.8 A
2/5/2018 48 33.6 36.5 40.7 33.8 34.8 36.0 -0.75 -0.71 -0.67 -1.21 11.0 11.8 12.5 A
2/6/2018 48 33.6 36.7 39.8 34.2 34.7 35.4 -0.86 -0.81 -0.72 -1.21 8.5 9.6 11.6A
2/7/2018 48 35.6 36.6 37.9 35.0 35.4 35.6 -0.86 -0.78 -0.71 -1.21 8.5 10.4 11.9 A
2/8/2018 48 32.0 35.2 37.1 32.0 34.5 35.6 -0.77 -0.66 -0.56 -1.21 10.5 12.9 14.9 A
2/9/2018 48 32.4 35.5 38.1 32.6 34.6 36.1 -0.69 -0.66 -0.64 -1.21 12.3 12.8 13.3 A
2/10/2018 48 36.0 37.6 39.0 34.8 35.2 35.6 -0.65 -0.46 -0.20 -1.21 13.1 16.9 22.2 A
2/11/2018 48 33.4 36.3 41.8 34.2 35.2 36.3 -0.46 -0.41 -0.35 -1.21 16.9 18.1 19.1 A
2/12/2018 48 29.4 35.2 39.9 34.2 35.0 36.1 -0.61 -0.53 -0.41 -1.21 13.9 15.4 18.1 A
2/13/2018 48 35.6 37.6 38.8 34.4 35.4 36.1 -0.70 -0.66 -0.60 -1.21 12.0 12.9 14.2 A
2/14/2018 48 31.2 35.7 39.8 34.6 35.8 37.3 -0.76 -0.72 -0.67 -1.21 10.8 11.6 12.7 A
2/15/2018 48 32.2 36.3 41.1 33.8 35.4 36.9 -0.78 -0.69 -0.60 -1.21 10.2 12.2 14.1 A
2/16/2018 48 25.8 33.5 39.4 33.4 34.4 36.0 -0.82 -0.76 -0.68 -1.21 9.5 10.7 12.5 A
2/17/2018 48 35.0 37.9 40.1 33.6 35.3 36.9 -0.83 -0.50 0.40 -1.21 9.2 16.0 33.8 A
2/18/2018 48 29.2 36.0 41.8 33.8 34.9 36.3 -0.41 -0.20 0.31 -1.21 18.0 22.2 32.1 A
2/19/2018 48 36.7 39.9 48.9 35.0 36.3 38.4 -0.52 -0.47 -0.40 -1.21 15.8 16.8 18.3 A
2/20/2018 48 29.4 36.2 44.4 35.2 36.2 37.3 -0.60 -0.56 -0.51 -1.21 14.1 14.9 16.0 A
2/21/2018 48 35.4 40.0 43.3 36.0 36.7 38.1 -0.63 -0.58 -0.55 -1.21 13.4 14.4 15.2 A
2/22/2018 48 30.8 37.8 40.7 35.2 35.8 37.1 -0.69 -0.64 -0.56 -1.21 12.1 13.4 14.9 A
2/23/2018 48 31.4 37.5 44.6 34.2 35.9 37.7 -0.70 -0.62 -0.53 -1.21 12.1 13.7 15.6 A
2/24/2018 48 29.8 33.8 38.4 33.4 34.3 36.0 -0.72 -0.67 -0.60 -1.21 11.6 12.6 14.2 A
2/25/2018 48 29.8 38.2 43.1 34.2 35.8 38.1 -0.73 -0.70 -0.65 -1.21 11.4 12.0 13.1 A
2/26/2018 48 34.2 38.3 42.5 34.2 35.2 37.3 -0.77 -0.73 -0.67 -1.21 10.6 11.3 12.6 A
2/27/2018 48 31.2 34.2 38.4 32.8 34.2 35.4 -0.84 -0.80 -0.74 -1.21 8.9 9.9 11.1 A
2/28/2018 48 25.4 33.3 47.4 33.2 34.7 37.5 -0.87 -0.85 -0.82 -1.21 8.3 8.8 9.3A
3/1/2018 48 34.0 36.4 40.9 33.8 35.2 36.9 -0.89 -0.84 -0.77 -1.21 7.8 9.1 10.6A
3/2/2018 48 31.8 33.3 35.8 32.2 34.0 35.0 -0.89 -0.85 -0.81 -1.21 8.0 8.8 9.7 A
3/3/2018 48 28.8 34.0 41.4 32.6 34.5 37.5 -0.93 -0.90 -0.87 -1.21 7.1 7.6 8.4 A
3/4/2018 48 29.6 36.7 45.3 33.8 35.9 39.0 -0.96 -0.94 -0.92 -1.21 6.4 6.8 7.1 A
3/5/2018 48 28.6 36.6 45.6 33.8 35.0 36.9 -0.97 -0.95 -0.93 -1.21 6.0 6.5 6.9 A
3/6/2018 48 36.1 39.1 40.9 34.8 36.3 37.7 -0.97 -0.88 -0.67 -1.21 6.0 8.0 12.6A
3/7/2018 48 38.4 42.3 47.3 36.0 36.5 37.5 -0.68 -0.54 -0.43 -1.21 12.4 15.2 17.6 A
3/8/2018 48 28.6 31.8 38.8 31.8 33.5 36.0 -0.70 -0.60 -0.54 -1.21 11.9 14.0 15.3 A
3/9/2018 48 24.5 28.8 35.6 31.8 32.3 33.6 -0.77 -0.72 -0.66 -1.21 10.5 11.6 12.8 A
3/10/2018 48 22.8 26.7 33.0 31.8 32.5 33.8 -0.84 -0.80 -0.76 -1.21 9.1 9.8 10.8 A
3/11/2018 48 23.0 30.5 40.5 32.8 33.9 35.4 -0.87 -0.84 -0.82 -1.21 8.4 8.9 9.5A
3/12/2018 48 33.4 35.9 41.6 33.8 34.8 36.3 -0.90 -0.88 -0.81 -1.21 7.6 8.1 9.6A
3/13/2018 48 33.2 35.9 42.5 34.8 35.8 38.6 -0.94 -0.91 -0.88 -1.21 6.9 7.5 8.1A
3/14/2018 48 32.0 33.1 34.0 33.8 34.5 34.8 -0.94 -0.92 -0.89 -1.21 6.8 7.3 7.8A
3/15/2018 48 32.6 37.1 39.0 32.2 34.8 36.1 -0.94 -0.67 -0.45 -1.21 6.8 12.5 17.1 A
3/16/2018 48 32.8 37.5 47.6 34.4 35.5 38.3 -0.70 -0.63 -0.48 -1.21 12.0 13.5 16.5 A
3/17/2018 48 32.6 37.9 45.8 34.4 36.1 39.2 -0.77 -0.74 -0.70 -1.21 10.4 11.2 12.0 A
3/18/2018 48 36.3 41.1 54.1 35.0 37.3 42.4 -0.76 -0.68 -0.53 -1.21 10.7 12.4 15.6 A
3/19/2018 48 33.8 37.4 45.5 34.2 35.6 38.6 -0.72 -0.67 -0.57 -1.21 11.5 12.7 14.7 A
3/20/2018 48 26.5 36.1 49.2 34.2 35.9 39.6 -0.77 -0.75 -0.71 -1.21 10.6 11.0 11.7 A
3/21/2018 48 23.9 35.3 51.2 33.6 36.0 40.3 -0.80 -0.77 -0.75 -1.21 9.8 10.4 11.0 A
3/22/2018 48 35.2 38.0 44.2 34.8 36.6 38.3 -0.78 -0.71 -0.65 -1.21 10.3 11.7 13.0 A
3/23/2018 48 28.6 38.0 51.0 33.8 35.6 39.4 -0.80 -0.76 -0.70 -1.21 9.9 10.8 12.1 A
3/24/2018 48 31.6 34.7 39.6 32.0 34.4 36.1 -0.84 -0.81 -0.77 -1.21 9.0 9.7 10.4 A
3/25/2018 48 33.0 37.8 48.5 34.8 36.4 40.1 -0.86 -0.83 -0.78 -1.21 8.6 9.3 10.2 A
3/26/2018 48 26.2 36.7 48.3 33.8 35.6 39.0 -0.91 -0.87 -0.82 -1.21 7.4 8.3 9.4A
3/27/2018 48 31.4 36.6 45.3 33.4 35.4 38.3 -0.95 -0.92 -0.88 -1.21 6.6 7.1 8.0A
3/28/2018 48 27.3 36.4 49.6 34.2 36.2 39.8 -0.98 -0.96 -0.93 -1.21 5.9 6.3 7.0A
3/29/2018 48 25.2 35.4 52.2 33.4 36.1 41.1 -1.01 -0.99 -0.97 -1.21 5.2 5.7 6.1A
3/30/2018 48 20.3 33.2 52.8 32.6 35.7 40.3 -1.01 -0.99 -0.98 -1.21 5.1 5.5 5.8A
3/31/2018 48 21.7 34.6 52.1 32.8 35.5 40.5 -1.03 -1.00 -0.98 -1.21 4.8 5.4 5.8A
4/1/2018 48 33.8 39.3 51.5 34.6 36.7 41.3 -1.04 -1.01 -0.99 -1.21 4.6 5.1 5.6 A
4/2/2018 48 34.8 37.5 43.1 35.2 36.2 38.1 -1.06 -1.03 -1.01 -1.21 4.0 4.7 5.2 A
4/3/2018 48 33.4 39.9 53.8 35.4 37.1 41.6 -1.06 -1.05 -1.03 -1.21 3.9 4.3 4.7 A
4/4/2018 48 29.2 34.0 43.6 33.0 35.3 38.6 -1.07 -1.05 -1.02 -1.21 3.8 4.3 5.0 A
4/5/2018 48 22.6 29.8 42.7 31.8 34.6 40.1 -1.09 -1.07 -1.05 -1.21 3.4 3.9 4.3 A
4/6/2018 48 15.8 30.0 44.4 31.8 33.7 37.3 -1.11 -1.08 -1.04 -1.21 2.8 3.4 4.4 A
4/7/2018 48 31.0 36.4 47.8 33.4 35.4 38.8 -1.11 -1.09 -1.08 -1.21 2.7 3.1 3.6 A
4/8/2018 48 32.8 41.7 58.1 34.6 37.9 44.6 -1.12 -1.09 -1.02 -1.21 2.5 3.3 5.0 A
4/9/2018 48 31.8 36.2 42.9 33.8 36.2 38.4 -1.05 -1.02 -0.99 -1.21 4.2 4.9 5.6 A
4/10/2018 48 32.0 33.0 34.8 32.4 33.2 34.8 -1.07 -0.99 -0.87 -1.21 3.7 5.7 8.3A
4/11/2018 48 32.0 38.5 49.2 32.6 35.5 38.8 -0.94 -0.90 -0.87 -1.21 6.9 7.6 8.3A
4/12/2018 48 31.8 34.0 36.3 32.8 34.4 35.0 -0.96 -0.93 -0.90 -1.21 6.3 6.9 7.6A
4/13/2018 48 31.8 37.5 51.2 32.8 36.0 40.5 -0.99 -0.96 -0.94 -1.21 5.7 6.3 6.8A
4/14/2018 48 29.6 40.2 49.1 34.6 36.5 38.8 -1.01 -0.86 -0.49 -1.21 5.2 8.4 16.3 A
4/15/2018 48 35.4 42.1 56.9 34.2 35.6 37.7 -0.49 -0.28 0.09 -1.21 16.4 20.5 27.8 A
4/16/2018 48 26.0 37.7 51.5 34.2 36.4 40.5 -0.60 -0.56 -0.46 -1.21 14.0 14.9 16.9 A
4/17/2018 48 33.4 38.3 44.0 33.8 36.0 38.3 -0.59 -0.50 -0.40 -1.21 14.3 16.1 18.2 A
4/18/2018 48 34.8 37.8 43.3 35.4 36.4 38.1 -0.60 -0.53 -0.46 -1.21 14.2 15.6 16.9 A
4/19/2018 48 29.2 37.1 48.3 35.0 36.7 39.2 -0.63 -0.57 -0.48 -1.21 13.6 14.7 16.7 A:e
4/20/2018 48 30.6 40.2 51.5 35.6 37.4 40.3 -0.70 -0.65 -0.59 -1.21 12.1 13.0 14.3 A
4/21/2018 48 28.8 36.1 45.3 35.4 36.9 39.4 -0.74 -0.70 -0.65 -1.21 11.1 12.0 13.0 A
4/22/2018 48 31.8 38.4 48.7 33.8 37.4 42.5 -0.80 -0.76 -0.72 -1.21 10.0 10.7 11.6 A
4/23/2018 48 32.6 40.3 49.9 34.8 37.4 42.2 -0.79 -0.72 -0.50 -1.21 10.1 11.6 16.2 A
4/24/2018 48 33.0 37.4 43.3 34.4 36.1 37.9 -0.64 -0.56 -0.41 -1.21 13.3 15.0 18.0 A
4/25/2018 48 35.2 39.9 51.9 35.4 37.0 40.3 -0.67 -0.63 -0.60 -1.21 12.6 13.5 14.2 A
12/3/2021
Daily, _SfkHydrology.xlsx
Page 5 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
4/26/2018 48 29.2 39.4 51.5 34.8 36.9 39.8 -0.74 -0.70 -0.64 -1.21 11.2 12.0 13.3 A
4/27/2018 48 35.2 41.5 54.3 36.0 37.4 40.3 -0.78 -0.74 -0.67 -1.21 10.2 11.1 12.7 A
4/28/2018 48 38.8 44.2 55.0 36.5 37.9 41.3 -0.65 -0.62 -0.54 -1.21 13.0 13.7 15.4 A
4/29/2018 48 39.8 45.2 58.0 36.3 37.3 39.4 -0.51 -0.46 -0.40 -1.21 15.9 17.0 18.3 A
4/30/2018 48 36.0 42.7 55.0 35.6 37.3 40.1 -0.65 -0.59 -0.50 -1.21 13.1 14.3 16.2 A
5/1/2018 48 29.8 41.3 52.9 34.8 37.1 40.3 -0.73 -0.69 -0.61 -1.21 11.5 12.3 13.9 A
5/2/2018 48 36.5 40.1 44.9 36.3 37.6 40.3 -0.75 -0.71 -0.64 -1.21 10.9 11.8 13.2 A
5/3/2018 48 31.8 37.2 47.6 34.8 36.3 38.6 -0.78 -0.72 -0.65 -1.21 10.3 11.7 13.0 A
5/4/2018 48 31.8 35.4 46.4 34.4 36.1 39.6 -0.84 -0.79 -0.75 -1.21 9.0 10.0 10.9 A
5/5/2018 48 29.8 38.1 52.6 32.6 36.9 43.3 -0.85 -0.82 -0.78 -1.21 8.7 9.4 10.2A
5/6/2018 48 23.9 35.3 45.1 33.6 36.3 39.2 -0.91 -0.86 -0.83 -1.21 7.5 8.6 9.3 A
5/7/2018 48 33.0 37.2 41.8 33.0 35.1 36.9 -0.85 -0.64 -0.34 -1.21 8.7 13.3 19.5 A
5/8/2018 48 36.7 39.3 44.9 35.4 36.4 38.3 -0.57 -0.50 -0.43 -1.21 14.7 16.2 17.6 A
5/9/2018 48 34.0 40.3 53.8 35.0 37.0 40.3 -0.61 -0.54 -0.43 -1.21 13.8 15.3 17.5 A
5/10/2018 48 32.4 35.8 39.8 34.8 36.3 37.7 -0.70 -0.64 -0.57 -1.21 11.9 13.3 14.7 A
5/11/2018 48 31.0 39.8 51.7 35.4 37.8 41.6 -0.73 -0.68 -0.61 -1.21 11.3 12.4 13.9 A
5/12/2018 48 28.1 38.6 60.0 35.2 37.8 43.1 -0.76 -0.73 -0.69 -1.21 10.8 11.3 12.3 A
5/13/2018 48 30.2 38.7 50.3 35.8 37.8 39.9 -0.82 -0.76 -0.71 -1.21 9.4 10.8 11.7 A:e
5/14/2018 48 29.6 40.1 51.9 35.0 38.0 41.4 -0.80 -0.77 -0.69 -1.21 9.9 10.5 12.2 A
5/15/2018 48 31.8 40.3 49.9 36.0 37.8 39.8 -0.83 -0.80 -0.75 -1.21 9.1 9.8 10.9 A
5/16/2018 48 35.0 39.2 46.2 36.1 37.5 39.0 -0.88 -0.84 -0.82 -1.21 8.0 8.9 9.5A
5/17/2018 48 35.0 40.0 44.0 36.1 37.1 38.6 -0.85 -0.64 -0.31 -1.21 8.8 13.1 20.1 A
5/18/2018 48 40.5 44.0 54.8 36.3 37.0 39.0 -0.33 -0.27 -0.21 -1.21 19.6 20.8 22.1 A
5/19/2018 48 37.7 42.7 52.4 36.3 37.4 39.8 -0.45 -0.39 -0.32 -1.21 17.2 18.3 19.9 A
5/20/2018 48 37.7 44.3 54.5 36.5 38.0 41.4 -0.54 -0.46 -0.40 -1.21 15.3 17.0 18.2 A
5/21/2018 48 34.6 38.5 42.5 35.6 37.4 39.8 -0.57 -0.49 -0.39 -1.21 14.7 16.4 18.4 A
5/22/2018 48 35.6 44.3 56.1 35.4 38.1 42.0 -0.62 -0.56 -0.52 -1.21 13.7 14.9 15.7 A
5/23/2018 48 38.3 41.8 48.0 36.9 37.8 39.8 -0.58 -0.52 -0.41 -1.21 14.6 15.8 18.0 A
5/24/2018 48 33.8 42.2 53.3 36.1 38.0 40.5 -0.66 -0.56 -0.42 -1.21 12.8 14.9 17.7 A
5/25/2018 48 36.0 43.2 53.1 36.5 38.3 41.4 -0.65 -0.60 -0.54 -1.21 13.1 14.1 15.4 A
5/26/2018 48 36.9 38.6 42.2 36.9 37.4 38.1 -0.65 -0.60 -0.55 -1.21 13.0 14.2 15.2 A
5/27/2018 48 38.4 42.0 55.5 36.7 38.2 41.4 -0.65 -0.61 -0.53 -1.21 13.0 13.9 15.5 A
5/28/2018 48 36.9 43.1 62.3 36.3 37.9 41.1 -0.69 -0.50 -0.26 -1.21 12.2 16.1 21.0 A
5/29/2018 48 39.9 44.1 52.1 37.1 38.4 42.5 -0.55 -0.48 -0.39 -1.21 15.1 16.6 18.5 A
5/30/2018 48 33.0 45.3 60.0 36.1 38.6 42.0 -0.59 -0.54 -0.46 -1.21 14.3 15.4 17.0 A
5/31/2018 48 37.7 42.4 54.1 36.9 38.4 41.1 -0.57 -0.53 -0.47 -1.21 14.7 15.5 16.8 A
6/1/2018 48 38.3 47.4 62.1 36.7 38.8 43.1 -0.60 -0.55 -0.51 -1.21 14.2 15.1 16.0 A
6/2/2018 48 40.3 42.2 45.3 36.5 37.8 39.0 -0.63 -0.42 -0.12 -1.21 13.5 17.8 23.9 A
6/3/2018 48 38.4 44.2 51.5 36.9 38.4 40.3 -0.45 -0.38 -0.20 -1.21 17.2 18.6 22.2 A
6/4/2018 48 39.6 42.0 45.5 37.5 38.1 39.2 -0.54 -0.45 -0.38 -1.21 15.4 17.2 18.5 A
6/5/2018 48 38.3 46.5 61.2 37.1 38.8 42.7 -0.54 -0.49 -0.39 -1.21 15.3 16.4 18.4 A
6/6/2018 48 38.6 42.7 46.7 37.3 38.6 40.5 -0.61 -0.50 -0.39 -1.21 14.0 16.1 18.4 A
6/7/2018 48 35.8 54.2 68.9 37.3 40.5 44.9 -0.49 -0.35 -0.18 -1.21 16.3 19.2 22.6 A
6/8/2018 48 35.4 49.9 68.1 36.5 40.3 46.2 -0.47 -0.38 -0.28 -1.21 16.8 18.5 20.5 A
6/9/2018 48 41.1 46.4 56.4 38.1 39.1 40.9 -0.50 -0.45 -0.39 -1.21 16.2 17.2 18.4 A
6/10/2018 48 33.0 51.0 67.2 36.7 40.8 46.9 -0.53 -0.44 -0.33 -1.21 15.5 17.3 19.6 A
6/11/2018 48 30.6 50.8 71.0 37.3 41.1 47.1 -0.50 -0.41 -0.28 -1.21 16.1 18.0 20.5 A
6/12/2018 48 33.6 53.7 73.4 37.9 41.3 46.5 -0.44 -0.38 -0.32 -1.21 17.3 18.6 19.8 A
6/13/2018 48 34.4 49.4 67.1 37.7 41.0 47.3 -0.55 -0.49 -0.41 -1.21 15.1 16.3 18.0 A
6/14/2018 48 42.5 45.7 52.2 39.0 39.8 40.7 -0.59 -0.56 -0.50 -1.21 14.3 14.9 16.2 A
6/15/2018 48 44.0 45.1 46.2 38.8 39.2 40.1 -0.44 -0.13 0.15 -1.21 17.4 23.6 29.1 A
6/16/2018 48 42.0 44.1 46.2 38.6 39.2 39.8 0.07 0.27 0.37 -1.21 27.5 31.4 33.1A
6/17/2018 48 40.5 45.8 54.7 38.6 39.7 41.8 -0.18 0.02 0.30 -1.21 22.6 26.5 31.8 A
6/18/2018 48 40.5 44.4 49.6 39.2 40.0 41.3 -0.34 -0.26 -0.13 -1.21 19.4 21.1 23.5 A
6/19/2018 48 39.4 45.6 53.6 38.4 39.9 41.4 -0.50 -0.41 -0.33 -1.21 16.2 18.0 19.6 A
6/20/2018 48 39.6 43.8 50.1 38.8 39.8 41.3 -0.59 -0.52 -0.45 -1.21 14.4 15.7 17.1 A
6/21/2018 48 39.9 44.7 51.3 39.0 40.9 45.3 -0.64 -0.49 -0.32 -1.21 13.2 16.4 19.8 A
6/22/2018 48 40.7 46.0 52.4 38.8 39.8 41.1 -0.54 -0.51 -0.44 -1.21 15.3 16.0 17.4 A
6/23/2018 48 33.0 47.0 57.1 37.5 40.7 43.5 -0.61 -0.59 -0.54 -1.21 13.8 14.4 15.4 A
6/24/2018 48 43.3 46.6 55.0 39.8 41.1 43.3 -0.65 -0.61 -0.56 -1.21 13.0 13.9 15.0 A
6/25/2018 48 43.3 46.2 50.6 39.9 40.7 41.6 -0.57 -0.07 0.10 -1.21 14.8 24.8 28.1 A
6/26/2018 48 42.4 47.3 58.1 39.2 40.5 43.6 -0.32 -0.20 -0.03 -1.21 19.8 22.2 25.6 A
6/27/2018 48 37.9 47.5 58.3 38.8 41.2 44.2 -0.45 -0.40 -0.31 -1.21 17.2 18.2 19.9 A
6/28/2018 48 41.8 46.0 51.5 39.9 41.1 42.9 -0.60 -0.50 -0.43 -1.21 14.1 16.1 17.6 A
6/29/2018 48 41.6 47.7 56.9 40.1 41.6 44.0 -0.59 -0.52 -0.46 -1.21 14.2 15.8 17.0 A
6/30/2018 48 42.2 50.6 61.7 39.8 42.0 45.3 -0.57 -0.53 -0.50 -1.21 14.6 15.5 16.2 A
7/1/2018 48 40.7 52.4 71.9 40.3 43.0 48.5 -0.61 -0.59 -0.55 -1.21 13.8 14.4 15.2 A
7/2/2018 48 36.5 49.9 65.0 40.1 43.5 50.6 -0.66 -0.60 -0.55 -1.21 12.9 14.0 15.0 A
7/3/2018 48 46.5 48.9 54.0 42.0 42.7 43.8 -0.57 -0.43 -0.30 -1.21 14.7 17.6 20.2 A
7/4/2018 48 44.2 55.1 67.7 41.1 43.8 46.7 -0.55 -0.52 -0.44 -1.21 15.1 15.8 17.4 A
7/5/2018 48 46.2 57.1 76.9 42.7 45.1 49.1 -0.59 -0.56 -0.54 -1.21 14.3 14.9 15.4 A
7/6/2018 48 44.6 49.4 55.4 41.6 43.5 45.5 -0.66 -0.61 -0.51 -1.21 12.8 13.8 16.0 A
7/7/2018 48 45.6 50.2 56.4 41.8 43.3 45.6 -0.71 -0.62 -0.51 -1.21 11.8 13.7 16.0 A
7/8/2018 48 44.9 49.8 59.5 41.8 43.6 46.7 -0.71 -0.66 -0.61 -1.21 11.7 12.8 13.8 A
7/9/2018 48 43.1 46.3 52.8 41.4 43.1 46.2 -0.72 -0.69 -0.63 -1.21 11.7 12.3 13.4 A
7/10/2018 48 41.3 47.1 55.5 40.7 42.4 44.9 -0.73 -0.70 -0.67 -1.21 11.5 12.0 12.6 A
7/11/2018 48 36.7 49.3 62.6 39.6 42.5 45.6 -0.79 -0.76 -0.72 -1.21 10.0 10.7 11.5 A
7/12/2018 48 42.7 46.6 49.2 41.8 43.1 44.6 -0.80 -0.58 0.14 -1.21 9.9 14.4 28.8 A
7/13/2018 48 43.8 49.7 58.6 41.8 43.5 45.6 -0.55 -0.45 -0.21 -1.21 15.1 17.1 22.0 A
7/14/2018 48 42.4 48.6 58.6 41.6 43.9 48.2 -0.63 -0.59 -0.52 -1.21 13.4 14.3 15.8 A
7/15/2018 48 44.0 51.2 65.5 41.8 44.2 49.1 -0.69 -0.66 -0.62 -1.21 12.2 12.8 13.7 A
7/16/2018 48 42.4 50.5 60.4 41.6 44.5 48.7 -0.74 -0.71 -0.68 -1.21 11.2 11.8 12.5 A
7/17/2018 48 45.1 51.5 61.4 42.7 46.5 53.6 -0.77 -0.75 -0.73 -1.21 10.4 10.9 11.4 A
7/18/2018 48 46.5 47.3 48.2 44.0 44.6 46.0 -0.78 -0.75 -0.70 -1.21 10.3 11.0 11.9 A
7/19/2018 48 46.9 49.8 56.1 43.6 44.5 45.8 -0.73 -0.65 -0.60 -1.21 11.4 13.1 14.1 A
7/20/2018 48 47.4 52.1 60.4 43.8 45.9 49.1 -0.71 -0.69 -0.67 -1.21 11.8 12.2 12.7 A
7/21/2018 48 49.6 50.7 52.9 44.9 45.8 46.9 -0.76 -0.72 -0.68 -1.21 10.7 11.7 12.4 A
7/22/2018 48 48.3 50.0 52.2 44.9 45.6 46.2 -0.77 -0.73 -0.70 -1.21 10.6 11.4 12.0 A
7/23/2018 48 46.5 51.8 61.6 43.8 46.0 49.9 -0.78 -0.73 -0.70 -1.21 10.2 11.3 11.9 A
7/24/2018 48 49.8 53.0 59.0 45.3 47.1 50.3 -0.73 -0.72 -0.70 -1.21 11.3 11.6 12.0 A
7/25/2018 48 51.0 54.2 60.0 46.2 47.6 49.4 -0.76 -0.74 -0.71 -1.21 10.7 11.2 11.7 A
7/26/2018 48 50.3 53.7 58.3 46.5 47.7 49.1 -0.79 -0.74 -0.61 -1.21 10.1 11.1 13.9 A
12/3/2021
Daily, _SfkHydrology.xlsx
Page 6 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
7/27/2018 48 48.3 51.2 56.6 45.8 47.3 49.6 -0.74 -0.68 -0.63 -1.21 11.2 12.4 13.4 A
7/28/2018 48 48.7 49.6 50.6 46.5 46.8 47.3 -0.68 -0.27 0.02 -1.21 12.4 20.8 26.4 A
7/29/2018 48 48.2 50.2 52.4 45.3 46.6 47.6 -0.17 0.03 0.19 -1.21 22.8 26.7 29.9 A
7/30/2018 48 47.1 49.5 53.6 44.4 45.4 46.9 -0.21 -0.09 0.05 -1.21 22.0 24.4 27.1 A
7/31/2018 48 46.2 52.0 61.1 43.5 45.5 48.9 -0.44 -0.34 -0.20 -1.21 17.3 19.4 22.3 A
8/1/2018 48 45.3 50.3 55.4 43.6 45.5 47.6 -0.54 -0.48 -0.44 -1.21 15.3 16.5 17.4 A
8/2/2018 48 48.2 51.8 60.0 45.1 47.5 52.6 -0.58 -0.54 -0.50 -1.21 14.5 15.3 16.2 A
8/3/2018 48 47.4 55.7 66.4 44.6 47.9 52.6 -0.64 -0.61 -0.57 -1.21 13.2 14.0 14.8 A
8/4/2018 48 60.7 66.8 72.2 52.8 54.6 57.1 -0.68 -0.65 -0.62 -1.21 12.4 13.1 13.7 A
8/5/2018 48 56.1 66.2 77.6 51.2 54.7 59.2 -0.75 -0.71 -0.67 -1.21 10.9 11.8 12.6 A
8/6/2018 48 54.1 58.6 67.1 50.8 52.7 56.1 -0.79 -0.76 -0.73 -1.21 10.1 10.7 11.3 A
8/7/2018 48 47.6 53.0 56.1 48.0 50.4 53.6 -0.84 -0.81 -0.77 -1.21 9.0 9.7 10.4A
8/8/2018 48 47.3 54.2 65.0 46.9 49.0 52.2 -0.88 -0.85 -0.83 -1.21 8.1 8.7 9.2 A
8/9/2018 48 45.8 49.5 53.6 46.5 47.6 48.5 -0.93 -0.89 -0.87 -1.21 7.0 8.0 8.4 A
8/10/2018 48 51.3 57.0 64.8 48.5 51.6 56.6 -0.90 -0.80 -0.60 -1.21 7.6 9.9 14.0 A
8/11/2018 48 50.3 53.8 59.3 49.2 50.8 52.8 -0.88 -0.41 1.44 -1.21 8.1 17.5 53 A:e
8/12/2018 48 47.6 54.2 63.1 45.1 49.0 52.6 -0.15 0.14 0.83 -1.21 23.2 28.9 42 A
8/13/2018 48 47.1 51.6 58.1 43.5 46.0 50.3 -0.42 -0.29 -0.09 -1.21 17.7 20.5 24.4 A
8/14/2018 48 45.8 49.9 56.2 43.8 45.0 46.2 -0.56 -0.48 -0.39 -1.21 14.8 16.6 18.5 A
8/15/2018 48 41.4 47.1 54.5 43.3 45.1 47.6 -0.64 -0.59 -0.53 -1.21 13.3 14.4 15.5 A
8/16/2018 48 40.9 47.0 57.3 42.7 44.6 47.4 -0.72 -0.67 -0.59 -1.21 11.6 12.7 14.3 A
8/17/2018 48 36.7 46.8 57.6 41.8 45.0 49.1 -0.78 -0.73 -0.63 -1.21 10.3 11.4 13.5 A
8/18/2018 48 47.4 51.4 56.9 45.6 47.1 48.7 -0.69 -0.43 -0.10 -1.21 12.2 17.5 24.1 A
8/19/2018 48 48.3 51.5 57.8 46.4 47.2 48.7 -0.59 -0.53 -0.43 -1.21 14.4 15.5 17.7 A
8/20/2018 48 47.8 51.1 58.3 45.6 46.8 48.9 -0.68 -0.61 -0.54 -1.21 12.5 13.9 15.3 A
8/21/2018 48 47.1 52.8 63.3 45.3 47.4 50.8 -0.71 -0.65 -0.58 -1.21 11.8 13.1 14.4 A
8/22/2018 48 47.4 51.6 58.6 45.8 47.3 49.6 -0.74 -0.71 -0.67 -1.21 11.0 11.8 12.7 A
8/23/2018 48 43.5 53.4 62.8 45.5 47.9 51.5 -0.79 -0.76 -0.69 -1.21 10.0 10.8 12.1 A
8/24/2018 48 48.5 51.8 59.2 46.0 47.5 49.1 -0.86 -0.80 -0.74 -1.21 8.5 9.8 11.2 A
8/25/2018 48 52.1 55.4 60.2 47.8 50.2 52.8 -0.87 -0.82 -0.76 -1.21 8.3 9.3 10.7 A
8/26/2018 48 49.8 52.8 60.2 47.8 48.7 49.9 -0.90 -0.85 -0.81 -1.21 7.7 8.8 9.6A
8/27/2018 48 45.6 51.0 57.6 46.2 47.3 48.7 -0.93 -0.89 -0.85 -1.21 7.1 7.9 8.7A
8/28/2018 48 44.2 48.4 53.3 45.5 46.5 47.8 -0.97 -0.92 -0.87 -1.21 6.0 7.2 8.2A
8/29/2018 48 48.7 53.2 59.3 46.7 48.5 52.9 -1.00 -0.96 -0.91 -1.21 5.3 6.3 7.4A
8/30/2018 48 35.6 50.0 64.3 43.3 47.3 52.8 -1.01 -0.98 -0.95 -1.21 5.2 5.9 6.6A
8/31/2018 48 40.1 49.2 59.7 45.3 47.0 49.2 -1.03 -1.00 -0.98 -1.21 4.8 5.3 5.8A
9/1/2018 48 46.0 50.4 56.4 45.8 46.9 48.7 -1.06 -1.03 -1.00 -1.21 4.1 4.7 5.4 A
9/2/2018 48 46.4 49.0 54.8 45.8 47.1 49.6 -1.06 -1.03 -0.98 -1.21 4.0 4.6 5.9 A
9/3/2018 48 43.6 49.5 57.1 45.1 47.1 50.1 -1.10 -1.06 -1.04 -1.21 3.1 4.0 4.6 A
9/4/2018 48 44.7 49.7 59.3 45.3 47.6 52.1 -1.10 -1.07 -1.05 -1.21 3.1 3.7 4.3 A
9/5/2018 48 36.7 46.2 57.3 43.3 47.0 52.1 -1.11 -1.09 -1.07 -1.21 2.6 3.2 3.8 A
9/6/2018 48 40.5 52.1 60.4 46.0 49.1 52.4 -1.13 -1.04 -0.86 -1.21 2.3 4.4 8.5 A
9/7/2018 48 47.8 50.9 56.8 46.9 49.4 51.7 -1.06 -1.03 -0.97 -1.21 3.9 4.8 6.2 A
9/8/2018 48 44.0 51.4 59.2 44.9 48.0 53.3 -1.11 -1.07 -1.05 -1.21 2.7 3.7 4.3 A
9/9/2018 48 34.0 47.7 59.2 43.8 47.0 53.3 -1.11 -1.09 -1.07 -1.21 2.7 3.2 3.8 A
9/10/2018 48 43.5 49.2 55.4 44.7 47.4 51.5 -1.13 -1.10 -1.07 -1.21 2.3 3.1 3.7A
9/11/2018 32 43.5 50.7 59.3 46.5 47.8 51.0 -1.13 -1.11 -1.09 -1.21 2.3 2.9 3.4A
GAP IN RECORD DUE TO EQUIPMENT FAILURE (Note 6)
11/21/2018 16 31.8 33.7 35.8 35.4 35.7 36.0 -0.77 -0.73 -0.70 -1.26 11.5 12.413.2 A
11/22/2018 48 26.9 32.9 38.1 34.8 36.0 37.3 -0.80 -0.76 -0.71 -1.26 10.9 11.712.9 A
11/23/2018 48 37.7 40.6 43.5 36.7 38.2 39.4 -0.74 -0.57 -0.24 -1.26 12.2 15.722.3 A
11/24/2018 48 35.4 39.7 41.8 37.9 38.9 39.6 -0.67 -0.63 -0.57 -1.26 13.7 14.615.7 A
11/25/2018 48 35.8 38.2 39.9 37.1 38.2 38.8 -0.74 -0.69 -0.64 -1.26 12.1 13.314.3 A
11/26/2018 48 31.8 33.8 36.5 33.6 35.1 37.1 -0.81 -0.75 -0.69 -1.26 10.8 11.913.2 A
11/27/2018 48 21.4 30.3 31.8 32.8 33.5 34.0 -0.83 -0.81 -0.75 -1.26 10.3 10.712.1 A:e
11/28/2018 48 21.7 29.4 31.8 31.8 32.9 34.4 -0.85 -0.84 -0.83 -1.26 9.9 10.1 10.3 A:e
11/29/2018 48 21.4 31.3 39.0 32.4 34.2 35.6 -0.87 -0.83 -0.68 -1.26 9.5 10.3 13.5 A:e
11/30/2018 48 38.4 41.0 42.5 35.2 35.6 36.0 -0.67 0.08 0.90 -1.26 13.6 28.4 44 A:e
12/1/2018 48 30.8 36.4 40.3 35.8 36.7 37.7 -0.04 0.10 0.53 -1.26 26.2 28.9 37.1 A
12/2/2018 48 26.5 31.8 36.7 36.0 36.6 37.1 -0.40 -0.25 -0.04 -1.26 19.3 22.2 26.3 A
12/3/2018 48 35.6 40.0 42.5 36.7 38.0 39.4 -0.48 -0.33 0.06 -1.26 17.6 20.6 28.3 A
12/4/2018 48 36.1 38.7 40.7 36.9 37.7 38.6 -0.38 -0.31 -0.18 -1.26 19.5 21.0 23.7 A
12/5/2018 48 37.5 39.5 41.3 37.9 38.3 38.8 -0.43 -0.36 -0.30 -1.26 18.6 19.9 21.2 A
12/6/2018 48 32.0 37.7 39.2 37.5 38.2 38.4 -0.50 -0.44 -0.37 -1.26 17.1 18.5 19.9 A
12/7/2018 48 28.1 32.7 36.1 34.0 36.0 37.3 -0.60 -0.56 -0.51 -1.26 15.0 15.9 17.1 A:e
12/8/2018 48 22.8 28.4 31.8 33.6 34.0 34.6 -0.69 -0.65 -0.61 -1.26 13.4 14.2 15.0 A:e
12/9/2018 48 31.8 33.0 38.6 31.8 33.9 35.6 -0.75 -0.72 -0.69 -1.26 11.9 12.6 13.3 A:e
12/10/2018 48 25.4 29.8 32.0 32.0 34.0 35.4 -0.81 -0.78 -0.75 -1.26 10.7 11.311.9 A:e
12/11/2018 48 20.8 25.1 28.3 31.8 32.5 33.0 -0.86 -0.84 -0.81 -1.26 9.7 10.2 10.7 A:e
12/12/2018 48 24.7 28.1 32.0 32.0 33.0 33.8 -0.92 -0.88 -0.86 -1.26 8.3 9.1 9.6 A:e
12/13/2018 48 18.5 25.5 30.8 31.4 32.6 33.8 -0.96 -0.93 -0.89 -1.26 7.5 8.1 8.9 A
12/14/2018 48 24.1 28.2 31.8 32.2 32.8 33.4 -0.98 -0.95 -0.92 -1.26 6.9 7.6 8.2 A
12/15/2018 48 24.3 25.6 27.9 30.6 30.9 32.0 -1.01 -0.99 -0.97 -1.26 6.3 6.7 7.3 A:e
12/16/2018 48 22.3 23.9 25.6 30.0 30.6 31.0 -1.04 -1.03 -1.01 -1.26 5.6 6.0 6.3 A:e
12/17/2018 48 20.1 22.3 25.0 28.1 29.2 30.0 -1.07 -1.05 -1.04 -1.26 5.0 5.3 5.6 A:e
12/18/2018 48 23.0 27.7 31.6 29.2 30.7 31.8 -1.09 -1.08 -1.07 -1.26 4.4 4.7 5.0 A:e
12/19/2018 48 29.4 30.3 31.4 31.8 31.8 31.8 -1.12 -1.11 -1.09 -1.26 3.8 4.1 4.4 A:e
12/20/2018 48 29.8 30.9 31.6 31.8 31.8 31.8 -1.14 -1.13 -1.12 -1.26 3.3 3.5 3.8 A:e
12/21/2018 48 26.9 28.2 29.8 31.0 31.6 31.8 -1.16 -1.15 -1.14 -1.26 2.7 3.0 3.2 A:e
12/22/2018 48 25.8 26.8 27.3 29.4 30.2 31.2 -1.18 -1.17 -1.16 -1.26 2.2 2.5 2.7 A:e
12/23/2018 48 25.8 26.8 27.9 29.0 29.8 30.2 -1.20 -1.19 -1.18 -1.26 1.7 2.0 2.2 A:e
12/24/2018 48 25.8 26.3 27.1 28.6 29.5 30.4 -1.22 -1.21 -1.20 -1.26 1.2 1.5 1.7 A:e
12/25/2018 48 27.3 30.3 31.4 29.6 31.5 31.8 -1.24 -1.23 -1.22 -1.26 0.7 1.0 1.2 A:e
12/26/2018 48 29.2 30.1 30.8 31.6 31.8 31.8 -1.25 -1.24 -1.24 -1.26 0.5 0.5 0.7 A:e
12/27/2018 48 29.0 29.9 31.2 31.6 31.8 31.8 -1.25 -1.25 -1.25 -1.26 0.5 0.5 0.5 A:e
12/28/2018 48 22.1 24.6 29.8 26.2 28.9 31.8 -1.25 -1.25 -1.25 -1.26 0.5 0.5 0.5 A:e
12/29/2018 48 24.3 29.9 36.7 27.7 30.7 32.4 -1.25 -1.25 -1.25 -1.26 0.5 0.5 0.5 A:e
12/30/2018 48 32.2 35.3 39.0 32.0 33.2 36.1 -1.25 -1.09 -0.82 -1.26 0.5 4.3 10.4 A:e
12/31/2018 48 31.2 34.2 36.5 33.4 34.1 34.6 -1.03 -0.95 -0.86 -1.26 5.8 7.6 9.6 A:e
1/1/2019 48 25.4 29.4 34.0 31.4 32.7 34.0 -1.09 -1.07 -1.03 -1.26 4.5 5.0 5.8 A:e
12/3/2021
Daily, _SfkHydrology.xlsx
Page 7 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
1/2/2019 48 25.6 30.6 36.1 30.4 32.0 34.2 -1.11 -1.10 -1.09 -1.26 3.9 4.1 4.5 A:e
1/3/2019 48 25.4 31.0 34.2 31.2 32.2 33.4 -1.13 -1.12 -1.12 -1.26 3.5 3.6 3.9 A:e
1/4/2019 48 17.3 23.9 28.3 24.5 28.4 31.0 -1.14 -1.14 -1.13 -1.26 3.1 3.3 3.5 A:e
1/5/2019 48 23.7 32.6 36.9 27.3 32.5 35.0 -1.15 -1.15 -1.14 -1.26 2.9 3.0 3.1 A:e
1/6/2019 48 21.2 26.7 31.8 27.1 30.3 32.6 -1.16 -1.16 -1.16 -1.26 2.7 2.8 2.9 A:e
1/7/2019 48 24.1 31.7 34.0 27.9 32.1 33.6 -1.17 -1.17 -1.16 -1.26 2.5 2.6 2.7 A:e
1/8/2019 48 31.8 32.7 35.8 32.8 33.3 35.0 -1.18 -1.17 -1.17 -1.26 2.3 2.4 2.5 A:e
1/9/2019 48 30.0 33.3 38.6 32.6 33.9 36.3 -1.18 -1.18 -1.18 -1.26 2.2 2.3 2.3 A:e
1/10/2019 48 24.1 31.2 35.8 30.4 32.5 34.6 -1.19 -1.18 -1.18 -1.26 2.1 2.1 2.2A:e
1/11/2019 48 31.8 32.7 35.0 32.0 33.0 34.4 -1.19 -1.19 -1.19 -1.26 2.0 2.0 2.1A:e
1/12/2019 48 31.8 34.4 38.4 32.6 34.5 36.7 -1.20 -1.19 -1.19 -1.26 1.9 1.9 2.0A:e
1/13/2019 48 34.8 36.6 38.8 34.4 35.3 36.9 -1.20 -1.11 -0.93 -1.26 1.8 4.0 8.2A:e
1/14/2019 48 33.0 36.1 39.0 34.4 35.1 35.6 -0.95 -0.89 -0.83 -1.26 7.7 9.0 10.3 A
1/15/2019 48 29.6 33.1 38.3 33.4 34.3 35.8 -1.07 -1.00 -0.90 -1.26 5.0 6.5 8.8A:e
1/16/2019 48 31.8 33.8 35.8 32.2 34.4 35.6 -1.13 -1.10 -1.07 -1.26 3.5 4.2 5.0A:e
1/17/2019 48 29.8 30.8 31.8 31.2 31.8 32.0 -1.17 -1.15 -1.13 -1.26 2.6 3.0 3.5A:e
1/18/2019 48 30.8 31.3 31.8 31.6 31.8 31.8 -1.19 -1.18 -1.17 -1.26 1.9 2.3 2.6A:e
1/19/2019 48 25.8 29.8 31.4 28.3 31.2 31.8 -1.21 -1.20 -1.19 -1.26 1.4 1.6 1.9A:e
1/20/2019 48 25.2 29.5 32.4 28.1 31.1 33.6 -1.23 -1.22 -1.22 -1.26 0.9 1.1 1.3A:e
1/21/2019 48 33.2 36.2 38.6 32.6 35.2 36.5 -1.24 -1.21 -0.94 -1.26 0.6 1.4 7.9A:e
1/22/2019 48 32.0 35.5 38.8 34.4 34.9 35.8 -0.95 -0.90 -0.85 -1.26 7.7 8.9 10.0 A
1/23/2019 48 31.0 34.8 38.6 33.8 34.9 36.1 -0.97 -0.95 -0.92 -1.26 7.2 7.7 8.3A
1/24/2019 48 29.8 32.5 35.0 32.4 33.7 35.0 -0.98 -0.96 -0.93 -1.26 7.0 7.5 8.2A
1/25/2019 48 30.0 33.7 38.1 31.8 33.6 36.0 -0.99 -0.95 -0.93 -1.26 6.8 7.7 8.2A
1/26/2019 48 32.0 37.7 39.6 32.8 33.5 34.4 -0.99 -0.28 0.09 -1.26 6.7 21.5 28.8 A
1/27/2019 48 32.0 35.7 37.7 34.4 35.3 36.0 -0.58 -0.46 -0.29 -1.26 15.6 17.9 21.5 A
1/28/2019 48 30.2 33.5 39.9 35.4 35.9 36.7 -0.73 -0.65 -0.57 -1.26 12.5 14.2 15.8 A
1/29/2019 48 29.2 32.8 36.1 35.4 35.8 36.5 -0.83 -0.76 -0.70 -1.26 10.2 11.8 13.0 A
1/30/2019 48 27.9 32.9 36.3 35.0 35.6 36.1 -0.89 -0.84 -0.77 -1.26 8.9 10.1 11.6 A
1/31/2019 48 29.4 34.7 37.9 35.0 35.9 36.7 -0.93 -0.88 -0.83 -1.26 8.1 9.1 10.2 A
2/1/2019 48 34.4 37.8 44.2 35.4 35.9 36.7 -0.87 -0.82 -0.78 -1.26 9.4 10.6 11.4 A
2/2/2019 48 38.4 40.4 46.4 35.2 36.0 37.1 -0.85 -0.56 -0.24 -1.26 9.9 16.0 22.4 A
2/3/2019 48 35.4 37.5 39.2 34.6 35.4 36.1 -0.39 -0.24 -0.09 -1.26 19.4 22.4 25.3 A
2/4/2019 48 35.4 38.1 40.3 34.8 35.7 36.3 -0.39 -0.17 0.00 -1.26 19.5 23.7 27.1 A
2/5/2019 48 33.8 36.2 39.8 35.2 35.7 36.1 -0.53 -0.42 -0.29 -1.26 16.5 18.7 21.4 A
2/6/2019 48 34.2 38.8 41.1 34.0 35.2 36.1 -0.52 0.00 0.30 -1.26 16.7 27.0 32.9A
2/7/2019 48 34.0 37.9 40.3 33.6 35.0 36.0 0.14 0.43 0.81 -1.26 29.8 35.2 42 A:e
2/8/2019 48 31.8 35.7 39.8 35.6 36.4 37.1 -0.24 -0.07 0.17 -1.26 22.3 25.7 30.3 A
2/9/2019 48 31.8 37.7 39.8 34.8 36.6 37.1 -0.26 -0.19 -0.12 -1.26 21.9 23.5 24.7 A
2/10/2019 48 31.0 33.3 37.3 32.0 34.3 36.0 -0.48 -0.34 -0.17 -1.26 17.6 20.3 23.7 A
2/11/2019 48 33.0 39.5 47.8 34.2 36.3 37.9 -0.55 -0.50 -0.45 -1.26 16.3 17.2 18.2 A
2/12/2019 48 31.8 35.3 40.3 34.2 35.8 36.7 -0.66 -0.59 -0.52 -1.26 13.8 15.3 16.7 A
2/13/2019 48 30.0 31.9 34.2 34.2 34.9 36.5 -0.74 -0.69 -0.65 -1.26 12.1 13.2 14.2 A
2/14/2019 48 29.6 36.2 43.6 34.2 35.6 36.9 -0.78 -0.75 -0.70 -1.26 11.4 12.0 13.1 A
2/15/2019 48 31.8 37.6 41.6 35.2 36.0 36.7 -0.80 -0.59 -0.40 -1.26 11.0 15.3 19.2 A
2/16/2019 48 29.4 33.8 39.2 34.6 35.5 36.7 -0.69 -0.66 -0.59 -1.26 13.2 14.0 15.4 A
2/17/2019 48 31.8 34.1 37.9 31.8 34.3 36.0 -0.72 -0.67 -0.63 -1.26 12.7 13.6 14.5 A
2/18/2019 48 33.8 37.4 41.8 33.4 35.1 36.9 -0.71 -0.68 -0.64 -1.26 12.8 13.5 14.3 A
2/19/2019 48 29.8 34.3 40.1 32.0 34.4 36.3 -0.76 -0.70 -0.57 -1.26 11.9 13.1 15.7 A
2/20/2019 48 30.4 35.2 39.2 33.0 35.2 36.3 -0.75 -0.67 -0.60 -1.26 12.1 13.6 15.2 A
2/21/2019 48 27.7 33.9 39.9 32.8 34.5 36.3 -0.80 -0.76 -0.72 -1.26 10.9 11.8 12.6 A
2/22/2019 48 34.2 35.8 38.8 34.4 35.4 37.3 -0.82 -0.77 -0.62 -1.26 10.5 11.6 14.8 A
2/23/2019 48 35.4 37.2 39.9 35.2 35.7 36.3 -0.71 -0.62 -0.27 -1.26 12.9 14.7 21.8 A
2/24/2019 48 33.4 36.6 42.0 34.6 35.8 37.3 -0.61 -0.48 -0.25 -1.26 14.8 17.6 22.2 A
2/25/2019 48 34.6 36.7 39.9 35.6 36.1 36.9 -0.66 -0.62 -0.57 -1.26 13.9 14.7 15.7 A
2/26/2019 48 30.6 35.3 46.4 35.4 35.9 37.5 -0.69 -0.64 -0.55 -1.26 13.3 14.3 16.2 A
2/27/2019 48 35.2 37.5 40.1 35.0 36.0 36.9 -0.74 -0.71 -0.67 -1.26 12.1 12.8 13.6 A
2/28/2019 48 31.0 36.9 39.6 35.6 36.1 36.5 -0.75 -0.65 -0.51 -1.26 12.0 14.0 16.9 A:e
3/1/2019 48 24.7 31.2 42.5 34.2 35.2 37.3 -0.75 -0.69 -0.62 -1.26 12.0 13.3 14.7 A:e
3/2/2019 48 23.0 30.5 40.1 33.6 34.8 37.3 -0.80 -0.76 -0.73 -1.26 11.0 11.7 12.4 A
3/3/2019 48 32.4 36.1 39.4 34.0 35.7 37.3 -0.85 -0.80 -0.73 -1.26 10.0 11.0 12.4 A
3/4/2019 48 35.2 37.2 39.8 35.4 35.8 36.5 -0.77 -0.64 -0.45 -1.26 11.6 14.4 18.3 A
3/5/2019 48 27.7 34.4 43.5 34.0 35.1 37.5 -0.73 -0.65 -0.51 -1.26 12.5 14.0 17.0 A
3/6/2019 48 22.6 30.7 36.5 32.0 33.6 35.2 -0.78 -0.76 -0.74 -1.26 11.3 11.8 12.3 A
3/7/2019 48 26.9 35.1 41.3 32.2 35.1 37.1 -0.83 -0.79 -0.75 -1.26 10.3 11.2 12.0 A
3/8/2019 48 25.2 32.1 39.2 32.0 34.3 36.5 -0.85 -0.81 -0.57 -1.26 9.8 10.7 15.8 A
3/9/2019 48 31.8 37.5 43.6 33.8 35.4 36.9 -0.55 -0.44 -0.28 -1.26 16.1 18.3 21.7 A
3/10/2019 48 31.6 34.9 37.5 32.6 35.2 36.5 -0.66 -0.59 -0.53 -1.26 13.9 15.3 16.5 A
3/11/2019 48 31.6 35.6 42.5 32.6 34.6 37.1 -0.71 -0.67 -0.63 -1.26 12.8 13.6 14.6 A
3/12/2019 48 29.8 33.4 36.7 32.8 35.1 36.7 -0.75 -0.69 -0.65 -1.26 12.0 13.2 14.2 A
3/13/2019 48 28.6 31.1 36.5 32.0 32.8 33.8 -0.81 -0.77 -0.73 -1.26 10.8 11.5 12.4 A
3/14/2019 48 19.4 28.8 38.4 32.0 33.8 36.7 -0.87 -0.83 -0.78 -1.26 9.5 10.2 11.3 A
3/15/2019 48 -2.6 30.2 53.4 32.2 33.7 36.5 -0.93 -0.88 -0.84 -1.26 8.1 9.2 10.1 A:e
3/16/2019 48 27.7 31.9 40.5 31.6 32.7 35.0 -0.95 -0.92 -0.89 -1.26 7.6 8.3 9.1A
3/17/2019 48 25.2 30.6 40.7 31.4 32.9 35.6 -0.96 -0.95 -0.92 -1.26 7.3 7.7 8.2A:e
3/18/2019 48 17.3 29.7 42.7 30.0 32.9 36.3 -0.95 -0.95 -0.95 -1.26 7.6 7.7 7.7A:e
3/19/2019 48 25.4 31.6 38.3 31.4 33.1 36.0 -0.96 -0.95 -0.95 -1.26 7.5 7.6 7.6A:e
3/20/2019 48 30.2 33.8 41.1 32.0 34.8 39.4 -0.96 -0.96 -0.96 -1.26 7.4 7.5 7.5A:e
3/21/2019 48 28.8 32.2 39.8 31.4 32.9 37.3 -0.96 -0.96 -0.96 -1.26 7.3 7.4 7.4A:e
3/22/2019 48 32.8 36.8 44.4 33.8 36.5 42.7 -0.97 -0.97 -0.96 -1.26 7.3 7.3 7.3A:e
3/23/2019 48 33.4 37.2 44.4 33.8 36.1 41.3 -0.97 -0.97 -0.94 -1.26 7.2 7.3 7.8A:e
3/24/2019 48 34.4 40.7 53.1 34.4 37.4 42.0 -0.97 -0.93 -0.79 -1.26 7.3 8.1 11.2 A
3/25/2019 48 36.7 40.9 46.4 33.8 35.2 37.1 -0.77 -0.12 0.41 -1.26 11.6 24.7 34.9 A
3/26/2019 48 30.8 39.2 52.4 34.4 35.7 38.6 -0.47 -0.39 -0.22 -1.26 17.7 19.4 22.8 A
3/27/2019 48 27.7 38.4 50.8 34.8 36.3 39.0 -0.65 -0.56 -0.48 -1.26 14.1 15.9 17.6 A
3/28/2019 48 25.4 36.9 51.3 34.4 36.4 39.9 -0.73 -0.67 -0.60 -1.26 12.5 13.7 15.2 A
3/29/2019 48 24.7 36.7 53.6 34.2 36.8 41.4 -0.76 -0.74 -0.70 -1.26 11.7 12.3 13.0 A
3/30/2019 48 25.0 35.0 48.2 34.2 36.1 38.8 -0.80 -0.77 -0.72 -1.26 10.9 11.6 12.7 A
3/31/2019 48 37.1 38.8 42.0 36.3 36.8 37.7 -0.79 -0.75 -0.70 -1.26 11.1 11.9 13.1 A
4/1/2019 48 37.7 39.5 41.8 36.0 36.6 37.1 -0.72 -0.62 -0.43 -1.26 12.6 14.7 18.7 A
4/2/2019 48 37.3 38.4 39.6 35.6 35.8 36.0 -0.44 -0.30 -0.11 -1.26 18.5 21.2 24.9 A
4/3/2019 48 38.4 39.5 41.1 35.6 35.8 36.1 -0.17 -0.03 0.16 -1.26 23.8 26.6 30.1 A
12/3/2021
Daily, _SfkHydrology.xlsx
Page 8 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
4/4/2019 48 36.3 41.7 54.5 35.8 36.7 39.4 -0.29 -0.17 -0.07 -1.26 21.5 23.7 25.8 A
4/5/2019 48 33.0 40.3 51.5 36.0 37.1 39.9 -0.48 -0.40 -0.27 -1.26 17.6 19.2 21.7 A
4/6/2019 48 32.2 38.0 47.1 35.8 37.0 39.0 -0.61 -0.53 -0.46 -1.26 15.0 16.5 18.0 A
4/7/2019 48 29.6 34.2 44.0 34.6 36.5 40.1 -0.70 -0.65 -0.58 -1.26 13.0 14.0 15.5 A:e
4/8/2019 48 26.7 35.4 45.1 34.2 36.1 38.1 -0.79 -0.74 -0.69 -1.26 11.2 12.2 13.2 A
4/9/2019 48 28.1 38.3 47.6 34.8 36.8 39.4 -0.83 -0.80 -0.77 -1.26 10.2 10.9 11.6 A
4/10/2019 48 33.8 39.1 42.7 34.6 36.8 37.9 -0.84 -0.74 -0.48 -1.26 10.2 12.2 17.6 A
4/11/2019 48 36.5 40.3 50.1 34.8 36.7 39.0 -0.60 -0.54 -0.48 -1.26 15.2 16.4 17.7 A
4/12/2019 48 36.5 40.5 48.9 35.8 36.8 38.6 -0.62 -0.56 -0.49 -1.26 14.8 15.9 17.4 A
4/13/2019 48 34.6 39.3 46.7 35.8 36.8 38.3 -0.64 -0.60 -0.56 -1.26 14.3 15.1 16.0 A
4/14/2019 48 34.8 40.6 51.7 36.0 37.4 40.1 -0.69 -0.65 -0.62 -1.26 13.3 14.1 14.8 A
4/15/2019 48 36.0 37.1 39.9 35.8 36.3 37.1 -0.65 -0.63 -0.60 -1.26 14.0 14.5 15.1 A
4/16/2019 48 30.4 34.1 39.6 34.4 35.8 37.1 -0.75 -0.71 -0.65 -1.26 11.9 12.9 14.1 A:e
4/17/2019 48 29.6 33.7 43.6 33.8 35.1 37.5 -0.81 -0.78 -0.74 -1.26 10.6 11.4 12.2 A:e
4/18/2019 48 29.8 35.6 48.0 34.4 36.4 42.2 -0.87 -0.84 -0.82 -1.26 9.5 10.0 10.6 A:e
4/19/2019 48 29.2 33.4 42.4 33.6 35.6 39.8 -0.91 -0.89 -0.87 -1.26 8.6 9.0 9.5A:e
4/20/2019 48 23.7 34.6 50.1 33.2 36.4 41.8 -0.94 -0.92 -0.91 -1.26 7.9 8.2 8.6A:e
4/21/2019 48 25.4 30.5 40.3 31.8 33.6 36.7 -0.97 -0.96 -0.94 -1.26 7.3 7.5 7.9A:e
4/22/2019 48 24.7 30.2 40.3 31.8 32.9 35.4 -0.99 -0.98 -0.97 -1.26 6.7 7.0 7.2A:e
4/23/2019 48 20.5 30.7 41.3 31.8 33.8 37.1 -1.01 -1.00 -0.99 -1.26 6.2 6.5 6.7A:e
4/24/2019 48 29.8 35.9 51.5 31.8 35.7 40.9 -1.05 -1.02 -1.01 -1.26 5.5 6.0 6.3A:e
4/25/2019 48 19.2 35.2 52.2 31.8 36.3 42.2 -1.07 -1.04 -1.02 -1.26 5.0 5.6 6.1A
4/26/2019 48 25.2 35.6 46.7 32.8 35.9 39.9 -1.07 -1.05 -1.04 -1.26 5.0 5.4 5.7A
4/27/2019 48 36.1 39.2 42.5 35.8 36.6 37.9 -1.06 -1.00 -0.87 -1.26 5.2 6.5 9.4A
4/28/2019 48 39.2 42.4 48.5 36.0 36.8 38.3 -0.87 -0.79 -0.65 -1.26 9.4 11.1 14.0 A
4/29/2019 48 40.3 41.5 43.1 35.8 36.0 36.3 -0.65 -0.35 -0.19 -1.26 14.2 20.1 23.3 A
4/30/2019 48 38.8 42.1 48.3 35.8 36.2 37.7 -0.25 -0.14 -0.06 -1.26 22.2 24.4 26.0 A
5/1/2019 48 36.0 40.6 46.4 36.0 36.8 38.3 -0.34 -0.29 -0.19 -1.26 20.4 21.5 23.4 A
5/2/2019 48 31.8 43.2 55.4 35.2 37.1 39.8 -0.53 -0.46 -0.32 -1.26 16.5 17.9 20.8 A
5/3/2019 48 28.1 42.0 58.1 35.0 38.0 42.9 -0.61 -0.57 -0.52 -1.26 14.8 15.8 16.7 A
5/4/2019 48 34.0 38.0 41.1 35.8 36.7 38.1 -0.67 -0.63 -0.57 -1.26 13.8 14.5 15.8 A
5/5/2019 48 37.1 40.6 52.1 35.6 36.8 37.9 -0.62 -0.45 -0.26 -1.26 14.7 18.2 22.0 A
5/6/2019 48 36.5 40.9 52.1 35.8 37.3 41.1 -0.56 -0.50 -0.36 -1.26 15.9 17.2 20.0 A
5/7/2019 48 35.2 44.1 57.4 35.6 37.9 42.0 -0.61 -0.54 -0.49 -1.26 14.9 16.3 17.3 A
5/8/2019 48 37.5 41.9 49.4 36.3 37.6 39.2 -0.62 -0.58 -0.52 -1.26 14.7 15.6 16.7 A
5/9/2019 48 36.3 42.9 60.7 36.3 38.1 41.6 -0.62 -0.58 -0.54 -1.26 14.6 15.6 16.4 A
5/10/2019 48 34.6 42.1 52.8 36.0 38.0 41.4 -0.66 -0.61 -0.56 -1.26 13.8 14.9 16.0 A
5/11/2019 48 31.2 42.3 54.0 35.8 38.2 42.7 -0.70 -0.66 -0.62 -1.26 13.0 13.8 14.8 A
5/12/2019 48 32.8 37.1 45.6 36.3 37.2 39.4 -0.78 -0.73 -0.66 -1.26 11.3 12.4 13.8 A
5/13/2019 48 34.0 38.4 46.4 35.4 37.5 40.3 -0.83 -0.78 -0.73 -1.26 10.3 11.3 12.5 A
5/14/2019 48 34.4 39.7 47.8 35.6 37.8 40.9 -0.82 -0.79 -0.75 -1.26 10.5 11.2 12.1 A
5/15/2019 48 31.8 42.7 55.5 36.1 38.6 42.2 -0.85 -0.81 -0.78 -1.26 9.9 10.7 11.4 A
5/16/2019 48 31.8 39.3 47.6 36.0 38.0 40.7 -0.84 -0.81 -0.78 -1.26 10.1 10.7 11.4 A
5/17/2019 48 33.6 41.5 55.0 35.4 38.3 42.7 -0.86 -0.83 -0.79 -1.26 9.6 10.3 11.1 A
5/18/2019 48 37.1 42.7 56.4 36.7 38.8 42.4 -0.84 -0.79 -0.71 -1.26 10.0 11.1 12.7 A
5/19/2019 48 30.4 43.0 59.0 35.8 39.4 45.8 -0.82 -0.75 -0.66 -1.26 10.5 12.1 13.8 A
5/20/2019 48 34.8 42.0 53.8 36.5 38.5 41.6 -0.81 -0.74 -0.67 -1.26 10.8 12.2 13.7 A
5/21/2019 48 37.1 45.0 59.0 36.9 39.1 42.9 -0.79 -0.74 -0.69 -1.26 11.2 12.1 13.3 A
5/22/2019 48 38.3 40.6 42.9 37.1 37.8 38.6 -0.75 -0.54 -0.28 -1.26 12.0 16.3 21.5 A
5/23/2019 48 39.8 45.9 54.3 36.9 38.4 41.3 -0.53 -0.45 -0.34 -1.26 16.7 18.1 20.5 A
5/24/2019 48 38.4 41.3 43.1 36.7 37.6 38.1 -0.56 -0.43 -0.24 -1.26 16.0 18.7 22.4 A
5/25/2019 48 36.7 42.0 48.0 36.3 37.6 39.2 -0.35 -0.30 -0.24 -1.26 20.1 21.2 22.3 A
5/26/2019 48 41.8 46.3 56.1 37.1 38.1 39.8 -0.26 -0.20 -0.13 -1.26 22.0 23.2 24.6 A
5/27/2019 48 41.4 44.8 53.6 37.5 38.1 39.8 -0.28 -0.24 -0.20 -1.26 21.6 22.4 23.1 A
5/28/2019 48 41.3 44.5 51.2 37.3 38.0 39.4 -0.30 -0.27 -0.23 -1.26 21.1 21.8 22.5 A
5/29/2019 48 40.5 45.7 56.1 37.5 38.5 40.3 -0.38 -0.32 -0.26 -1.26 19.7 20.7 22.0 A
5/30/2019 48 41.1 45.2 59.7 37.7 38.4 41.8 -0.35 -0.29 -0.24 -1.26 20.3 21.4 22.4 A
5/31/2019 48 39.6 42.5 47.1 37.5 38.3 39.8 -0.49 -0.43 -0.34 -1.26 17.4 18.6 20.4 A
6/1/2019 48 41.3 44.9 51.3 37.5 38.5 39.8 -0.36 -0.32 -0.24 -1.26 20.0 20.8 22.3 A
6/2/2019 48 38.1 47.9 61.9 37.3 39.3 42.2 -0.47 -0.43 -0.35 -1.26 17.7 18.5 20.2 A
6/3/2019 48 43.8 50.6 64.1 38.1 40.5 44.2 -0.49 -0.42 -0.31 -1.26 17.3 18.9 21.1 A
6/4/2019 48 42.0 48.9 63.5 37.9 40.2 44.7 -0.45 -0.37 -0.26 -1.26 18.2 19.8 21.9 A
6/5/2019 48 41.4 50.0 62.3 37.5 40.3 44.2 -0.46 -0.38 -0.32 -1.26 17.9 19.6 20.8 A
6/6/2019 48 39.8 50.7 66.2 37.3 41.1 46.9 -0.51 -0.43 -0.36 -1.26 16.9 18.5 20.1 A
6/7/2019 48 32.2 51.5 68.4 36.9 41.6 47.6 -0.57 -0.52 -0.44 -1.26 15.7 16.9 18.4 A
6/8/2019 48 41.8 51.7 67.7 38.4 42.0 48.2 -0.62 -0.56 -0.51 -1.26 14.7 15.9 16.9 A
6/9/2019 48 43.3 47.9 55.7 39.4 40.2 41.6 -0.64 -0.60 -0.54 -1.26 14.3 15.1 16.4 A
6/10/2019 48 41.8 49.2 60.0 38.8 40.9 44.4 -0.68 -0.64 -0.59 -1.26 13.6 14.4 15.4 A
6/11/2019 48 38.8 51.3 69.1 37.9 42.0 48.5 -0.68 -0.62 -0.54 -1.26 13.5 14.8 16.3 A
6/12/2019 48 42.7 49.0 64.0 39.0 41.0 44.7 -0.69 -0.64 -0.57 -1.26 13.3 14.3 15.9 A
6/13/2019 48 45.3 45.9 46.7 39.2 39.8 40.3 -0.56 -0.23 0.00 -1.26 15.9 22.5 27.2 A
6/14/2019 48 43.1 46.5 52.1 39.0 39.5 40.5 -0.28 -0.17 -0.04 -1.26 21.7 23.9 26.3 A
6/15/2019 48 41.3 45.1 49.4 38.6 39.5 40.3 -0.44 -0.38 -0.27 -1.26 18.3 19.6 21.7 A
6/16/2019 48 41.1 47.0 54.8 39.0 40.4 42.2 -0.54 -0.51 -0.46 -1.26 16.3 17.1 18.1 A
6/17/2019 48 43.8 49.9 56.4 39.6 41.3 43.3 -0.57 -0.50 -0.42 -1.26 15.7 17.2 18.7 A
6/18/2019 48 46.4 54.3 64.7 39.8 42.9 48.2 -0.49 -0.44 -0.38 -1.26 17.4 18.4 19.5 A
6/19/2019 48 43.1 50.6 61.9 39.4 41.7 45.6 -0.63 -0.56 -0.47 -1.26 14.5 15.9 17.7 A
6/20/2019 48 42.2 51.4 63.8 39.8 43.5 49.9 -0.68 -0.63 -0.57 -1.26 13.4 14.6 15.8 A
6/21/2019 48 43.5 51.6 62.9 40.1 42.6 48.3 -0.65 -0.62 -0.58 -1.26 14.1 14.7 15.6 A
6/22/2019 48 44.7 51.6 63.1 39.9 43.0 48.3 -0.65 -0.62 -0.57 -1.26 14.1 14.8 15.8 A
6/23/2019 48 42.2 51.1 63.8 39.8 42.6 46.5 -0.71 -0.67 -0.61 -1.26 12.9 13.8 14.9 A
6/24/2019 48 42.5 48.4 58.3 40.3 42.5 44.6 -0.77 -0.70 -0.54 -1.26 11.6 13.1 16.3 A
6/25/2019 48 47.6 49.9 55.4 42.2 43.6 46.5 -0.63 -0.22 0.59 -1.26 14.5 22.6 38.2 A
6/26/2019 48 46.7 48.3 50.6 42.2 43.3 44.7 0.35 0.70 1.05 -1.26 33.8 40 47 A:e
6/27/2019 48 43.1 46.1 49.1 41.4 43.0 43.8 0.44 0.79 1.18 -1.22 34.6 41 49 A:e
6/28/2019 48 42.5 48.2 59.0 41.1 42.5 45.6 -0.03 0.20 0.46 -1.21 25.5 30.0 34.9 A
6/29/2019 48 43.5 50.8 62.9 40.7 42.9 45.3 -0.32 -0.20 -0.03 -1.21 19.8 22.2 25.6 A
6/30/2019 48 41.6 50.3 59.9 41.3 43.1 45.1 -0.50 -0.42 -0.32 -1.21 16.1 17.8 19.9 A
7/1/2019 48 41.8 52.9 62.8 41.4 45.3 50.8 -0.59 -0.54 -0.49 -1.21 14.3 15.4 16.5 A
7/2/2019 48 47.3 56.5 70.3 42.9 47.1 53.4 -0.63 -0.58 -0.51 -1.21 13.4 14.6 16.0 A
7/3/2019 48 46.7 56.0 68.8 43.5 47.5 52.9 -0.66 -0.62 -0.57 -1.21 12.8 13.7 14.7 A
7/4/2019 48 40.3 52.7 65.0 43.5 46.6 52.2 -0.73 -0.70 -0.66 -1.21 11.4 11.9 12.9 A
12/3/2021
Daily, _SfkHydrology.xlsx
Page 9 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
7/5/2019 48 39.9 56.0 70.5 43.6 48.1 53.6 -0.77 -0.74 -0.70 -1.21 10.5 11.2 11.9 A
7/6/2019 48 46.2 52.9 59.2 46.0 46.7 48.0 -0.78 -0.76 -0.74 -1.21 10.3 10.7 11.2 A
7/7/2019 48 48.5 60.3 74.8 45.1 49.5 55.7 -0.81 -0.78 -0.75 -1.21 9.5 10.4 11.0 A
7/8/2019 48 49.2 53.5 67.6 46.4 48.1 50.3 -0.83 -0.80 -0.75 -1.21 9.3 10.0 11.0 A
7/9/2019 48 51.0 53.6 60.0 46.5 47.7 49.1 -0.84 -0.81 -0.77 -1.21 9.1 9.6 10.5A
7/10/2019 48 48.3 53.1 60.2 45.6 47.2 49.6 -0.88 -0.86 -0.84 -1.21 8.0 8.6 9.0A
7/11/2019 48 46.9 55.0 69.1 45.6 48.7 73.6 -0.91 -0.89 -0.86 -1.21 7.5 8.0 8.6P
7/12/2019 48 48.9 50.6 52.2 46.5 47.1 48.5 -0.90 -0.79 -0.59 -1.21 7.7 10.0 14.4 P
7/13/2019 48 48.7 52.9 59.5 45.6 47.3 49.8 -0.84 -0.74 -0.57 -1.21 9.0 11.2 14.8 P
7/14/2019 48 48.2 53.0 64.7 45.8 47.1 48.2 -0.81 -0.76 -0.69 -1.21 9.7 10.7 12.2 P
7/15/2019 48 47.3 50.4 55.2 45.5 46.6 48.2 -0.83 -0.76 -0.65 -1.21 9.3 10.7 13.1 P
7/16/2019 48 46.0 52.9 61.9 45.1 47.6 50.8 -0.81 -0.78 -0.75 -1.21 9.7 10.3 11.0 P
7/17/2019 48 49.6 52.1 57.1 47.1 48.2 49.6 -0.78 -0.72 -0.67 -1.21 10.2 11.5 12.7 P
7/18/2019 48 47.4 51.4 55.9 45.6 47.6 50.1 -0.78 -0.75 -0.72 -1.21 10.2 10.9 11.7 P
7/19/2019 48 49.2 53.9 61.6 46.0 49.1 54.3 -0.82 -0.78 -0.76 -1.21 9.4 10.3 10.8 P
7/20/2019 48 46.9 54.3 61.2 45.5 49.4 54.7 -0.86 -0.83 -0.79 -1.21 8.6 9.3 10.0 P
7/21/2019 48 43.8 53.2 62.3 45.3 48.1 50.6 -0.90 -0.87 -0.83 -1.21 7.7 8.4 9.3P
7/22/2019 48 48.7 52.5 59.5 46.7 48.0 49.4 -0.93 -0.90 -0.87 -1.21 7.1 7.7 8.3P
7/23/2019 48 49.6 54.9 64.1 47.1 49.1 52.4 -0.94 -0.92 -0.89 -1.21 6.7 7.2 7.8P
7/24/2019 48 49.6 54.0 63.1 48.0 49.6 51.9 -0.99 -0.95 -0.92 -1.21 5.7 6.5 7.2P
7/25/2019 48 44.0 51.1 55.4 47.3 48.5 49.9 -0.99 -0.96 -0.94 -1.21 5.6 6.2 6.7P
7/26/2019 48 47.1 51.2 57.8 46.0 48.2 51.2 -1.02 -0.99 -0.95 -1.21 4.9 5.6 6.5P
7/27/2019 48 44.2 54.3 66.2 45.8 49.1 52.9 -1.02 -1.01 -0.99 -1.21 4.9 5.2 5.6P:e
7/28/2019 48 46.5 60.9 71.7 48.7 52.3 57.6 -1.01 -1.01 -1.00 -1.21 5.1 5.3 5.4P:e
7/29/2019 48 41.1 54.1 66.4 46.0 52.0 57.3 -1.02 -1.02 -1.01 -1.21 4.9 5.0 5.1P:e
7/30/2019 48 50.8 53.8 56.8 50.5 52.0 53.4 -1.03 -1.03 -1.02 -1.21 4.7 4.8 4.9P:e
7/31/2019 48 52.2 57.2 66.9 50.3 53.0 56.8 -1.04 -1.03 -1.03 -1.21 4.5 4.6 4.7P:e
8/1/2019 48 52.8 58.8 65.3 51.3 54.4 57.4 -1.05 -1.04 -1.04 -1.21 4.3 4.4 4.5 P:e
8/2/2019 48 53.3 59.0 70.1 52.4 55.7 60.4 -1.05 -1.05 -1.05 -1.21 4.1 4.2 4.3 P:e
8/3/2019 48 54.3 58.4 65.0 53.6 56.2 62.6 -1.06 -1.06 -1.06 -1.21 3.9 4.0 4.1 P:e
8/4/2019 48 54.1 58.3 65.0 53.4 56.2 60.4 -1.07 -1.07 -1.06 -1.21 3.8 3.9 3.9 P:e
8/5/2019 48 52.4 60.7 67.9 53.6 57.9 63.6 -1.08 -1.07 -1.07 -1.21 3.6 3.7 3.8 P:e
8/6/2019 48 47.8 59.6 71.3 50.5 57.9 67.7 -1.08 -1.08 -1.08 -1.21 3.5 3.5 3.6 P:e
8/7/2019 48 53.6 58.6 66.2 53.6 56.6 60.5 -1.09 -1.08 -1.08 -1.21 3.3 3.4 3.5 P:e
8/8/2019 48 51.0 58.4 68.2 51.3 57.5 69.1 -1.09 -1.09 -1.09 -1.21 3.2 3.3 3.3 P:e
8/9/2019 48 45.1 57.3 69.1 48.7 57.2 72.4 -1.10 -1.10 -1.09 -1.21 3.1 3.1 3.2 P:e
8/10/2019 48 46.0 57.7 68.2 49.9 56.9 66.5 -1.10 -1.10 -1.10 -1.21 2.9 3.0 3.1P:e
8/11/2019 48 48.5 59.5 70.7 51.5 57.9 64.0 -1.11 -1.11 -1.10 -1.21 2.8 2.9 2.9P:e
8/12/2019 48 53.6 60.8 72.9 53.6 58.6 68.4 -1.11 -1.11 -1.11 -1.21 2.7 2.8 2.8P:e
8/13/2019 48 46.4 59.5 71.0 50.5 59.0 70.8 -1.12 -1.11 -1.11 -1.21 2.6 2.7 2.7P:e
8/14/2019 48 44.2 58.9 69.4 49.1 58.9 70.8 -1.12 -1.12 -1.12 -1.21 2.5 2.5 2.6P:e
8/15/2019 48 46.0 58.6 70.1 49.9 58.3 69.6 -1.13 -1.12 -1.12 -1.21 2.4 2.4 2.5P:e
8/16/2019 48 50.3 59.4 68.1 52.1 59.0 70.0 -1.13 -1.13 -1.13 -1.21 2.3 2.3 2.4P:e
8/17/2019 48 54.3 60.3 68.1 53.6 59.3 70.0 -1.13 -1.13 -1.13 -1.21 2.2 2.2 2.3P:e
8/18/2019 48 52.4 60.3 68.6 54.5 59.6 70.0 -1.14 -1.14 -1.13 -1.21 2.1 2.1 2.2P:e
8/19/2019 48 43.1 57.1 67.9 48.2 57.2 67.2 -1.14 -1.14 -1.14 -1.21 2.0 2.0 2.1P:e
8/20/2019 48 44.2 55.7 68.2 48.7 55.4 62.6 -1.14 -1.14 -1.14 -1.21 1.9 1.9 2.0P:e
8/21/2019 48 53.3 54.7 55.5 53.4 54.4 54.8 -1.15 -1.15 -1.14 -1.21 1.8 1.9 1.9P:e
8/22/2019 48 49.4 57.2 66.7 52.8 55.7 60.9 -1.15 -1.15 -1.15 -1.21 1.7 1.8 1.8P:e
8/23/2019 48 41.6 54.1 67.4 46.4 54.0 62.9 -1.15 -1.15 -1.15 -1.21 1.6 1.7 1.7P:e
8/24/2019 48 48.0 52.5 59.9 50.6 53.1 57.6 -1.16 -1.16 -1.15 -1.21 1.6 1.6 1.6P:e
8/25/2019 48 46.7 52.0 59.5 48.9 52.1 58.1 -1.16 -1.16 -1.16 -1.21 1.5 1.5 1.6P:e
8/26/2019 48 48.5 52.8 61.2 49.8 52.4 56.8 -1.16 -1.16 -1.16 -1.21 1.4 1.4 1.5P:e
8/27/2019 48 49.4 54.8 63.8 50.1 53.6 58.5 -1.17 -1.17 -1.16 -1.21 1.3 1.3 1.4P:e
8/28/2019 48 50.3 54.8 61.6 50.8 53.3 57.1 -1.17 -1.17 -1.17 -1.21 1.2 1.3 1.3P:e
8/29/2019 48 51.0 52.7 54.1 51.2 52.0 52.9 -1.17 -1.03 -0.32 -1.21 1.2 4.3 19.7 P:e
8/30/2019 48 47.8 53.2 58.8 50.5 51.5 52.9 -0.99 -0.88 -0.60 -1.21 5.6 8.1 14.1 P
8/31/2019 48 46.7 53.1 58.3 50.1 51.4 53.4 -1.02 -0.23 0.74 -1.21 4.9 21.1 40 P:e
9/1/2019 48 51.5 53.7 57.8 48.5 49.6 50.5 -0.20 0.14 0.52 -1.21 22.2 28.8 36.0P
9/2/2019 48 47.8 51.9 58.0 47.3 48.5 50.1 -0.48 -0.32 -0.20 -1.21 16.7 19.8 22.3 P
9/3/2019 48 43.5 51.2 62.3 45.8 47.8 50.6 -0.61 -0.54 -0.44 -1.21 13.9 15.4 17.4 P
9/4/2019 48 43.1 49.8 56.9 45.6 47.3 48.3 -0.73 -0.66 -0.54 -1.21 11.4 12.9 15.4 P
9/5/2019 48 51.3 52.2 52.8 48.3 49.5 50.1 -0.37 0.46 0.88 -1.21 18.8 34.9 43 P:e
9/6/2019 48 44.0 50.5 56.8 45.3 47.2 49.1 0.22 0.54 0.99 -1.21 30.3 36.5 45 P:e
9/7/2019 48 42.0 51.2 60.7 44.6 46.2 48.3 -0.26 -0.06 0.22 -1.21 21.1 25.0 30.4 P
9/8/2019 48 49.1 52.2 56.8 46.5 47.9 50.1 -0.33 -0.14 0.14 -1.21 19.6 23.3 28.9 P
9/9/2019 48 45.5 49.1 54.1 45.8 46.4 47.1 -0.45 -0.37 -0.26 -1.21 17.2 18.9 20.9 P
9/10/2019 48 40.1 49.3 58.1 44.2 45.9 47.8 -0.59 -0.53 -0.44 -1.21 14.3 15.6 17.5 P
9/11/2019 48 48.0 52.2 57.8 46.0 47.9 50.1 -0.61 -0.50 -0.31 -1.21 13.9 16.2 20.0 P
9/12/2019 48 45.6 48.6 52.1 45.6 46.5 47.3 -0.60 -0.54 -0.45 -1.21 14.1 15.2 17.3 P
9/13/2019 48 47.4 49.3 53.4 46.2 47.1 48.3 -0.57 -0.52 -0.46 -1.21 14.7 15.7 17.1 P
9/14/2019 48 42.4 48.7 52.6 45.1 46.5 47.8 -0.61 -0.57 -0.50 -1.21 14.0 14.8 16.1 P
9/15/2019 48 47.8 52.9 60.5 47.1 48.8 52.2 -0.67 -0.62 -0.57 -1.21 12.7 13.7 14.8 P
9/16/2019 48 48.0 51.6 58.6 46.5 47.8 50.1 -0.71 -0.66 -0.61 -1.21 11.9 12.7 13.9 P
9/17/2019 48 48.0 51.5 56.9 47.1 48.6 49.4 -0.73 -0.68 -0.57 -1.21 11.4 12.3 14.8 P
9/18/2019 48 45.3 50.3 56.6 46.4 47.0 48.2 -0.76 -0.71 -0.65 -1.21 10.7 11.7 13.0 P
9/19/2019 48 44.2 48.4 54.5 45.3 46.3 47.6 -0.81 -0.77 -0.73 -1.21 9.6 10.5 11.4 P
9/20/2019 48 44.6 48.0 53.6 45.1 46.1 47.3 -0.85 -0.79 -0.75 -1.21 8.8 10.0 11.0 P
9/21/2019 48 36.3 45.5 54.1 43.1 45.0 47.1 -0.87 -0.84 -0.79 -1.21 8.4 9.0 10.1 P
9/22/2019 48 43.8 46.7 48.7 44.7 45.8 46.5 -0.86 -0.49 -0.05 -1.21 8.6 16.3 25.1 P
9/23/2019 48 39.9 44.2 50.5 42.4 43.8 45.5 -0.55 -0.41 -0.03 -1.21 15.1 18.1 25.5 P
9/24/2019 48 38.8 44.9 54.8 41.3 43.1 46.2 -0.66 -0.61 -0.55 -1.21 12.9 14.0 15.2 P
9/25/2019 48 42.0 48.7 56.9 42.5 44.3 47.4 -0.75 -0.70 -0.63 -1.21 11.0 12.0 13.5 P
9/26/2019 48 41.1 47.2 52.4 43.3 44.2 45.3 -0.80 -0.76 -0.72 -1.21 9.8 10.6 11.6 P
9/27/2019 48 47.1 49.0 51.0 44.7 46.1 47.3 -0.82 -0.45 -0.07 -1.21 9.4 17.0 24.8 P
9/28/2019 48 48.0 49.9 53.4 46.5 47.0 48.2 -0.40 -0.25 0.00 -1.21 18.3 21.1 26.2 P
9/29/2019 48 36.9 46.5 56.1 42.5 44.7 46.7 -0.54 -0.44 -0.34 -1.21 15.3 17.4 19.5 P
9/30/2019 48 40.9 43.9 47.3 42.9 43.6 44.2 -0.59 -0.56 -0.50 -1.21 14.2 14.9 16.1 P
10/1/2019 48 42.0 46.3 49.2 42.9 43.6 44.6 -0.69 -0.62 -0.54 -1.21 12.1 13.7 15.3 P
10/2/2019 48 42.9 48.3 55.4 43.6 44.4 45.8 -0.75 -0.71 -0.66 -1.21 10.9 11.8 12.8 P
10/3/2019 48 42.7 47.1 55.2 43.6 44.5 46.0 -0.81 -0.77 -0.72 -1.21 9.7 10.6 11.6 P
10/4/2019 48 38.6 46.8 56.1 42.7 44.3 46.7 -0.87 -0.82 -0.78 -1.21 8.4 9.3 10.3 P
12/3/2021
Daily, _SfkHydrology.xlsx
Page 10 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
10/5/2019 48 45.3 47.7 52.4 44.0 44.8 45.5 -0.90 -0.86 -0.80 -1.21 7.6 8.5 9.8P
10/6/2019 48 34.2 43.6 49.6 42.0 44.3 45.8 -0.90 -0.84 -0.76 -1.21 7.6 8.9 10.7 P
10/7/2019 48 31.6 42.2 53.3 40.5 42.6 44.9 -0.95 -0.91 -0.88 -1.21 6.6 7.4 8.2P
10/8/2019 48 43.6 47.7 54.3 43.6 45.2 47.1 -0.96 -0.93 -0.90 -1.21 6.4 6.9 7.6P
10/9/2019 48 39.8 42.9 48.9 41.8 42.9 44.6 -0.98 -0.96 -0.93 -1.21 5.8 6.3 6.9P
10/10/2019 48 38.1 42.2 47.3 41.4 42.3 43.8 -0.99 -0.97 -0.91 -1.21 5.6 6.2 7.4 P
10/11/2019 48 39.2 45.6 56.2 41.6 43.7 46.9 -1.01 -0.99 -0.96 -1.21 5.1 5.5 6.3 P
10/12/2019 48 43.1 46.6 51.0 44.0 45.1 46.5 -1.01 -0.98 -0.94 -1.21 5.3 5.8 6.7 P
10/13/2019 48 43.5 45.9 49.4 44.0 44.9 45.8 -0.99 -0.92 -0.85 -1.21 5.7 7.2 8.7 P
10/14/2019 48 33.2 41.1 46.4 40.7 42.4 44.4 -0.98 -0.77 0.03 -1.21 6.0 10.4 26.7 P
10/15/2019 48 35.4 40.6 44.4 39.6 40.7 41.8 -0.71 -0.65 -0.56 -1.21 11.7 13.114.9 P
10/16/2019 48 34.8 39.8 44.6 38.8 40.3 42.4 -0.65 -0.49 -0.18 -1.21 13.0 16.322.7 P
10/17/2019 48 36.0 39.9 44.2 38.4 39.2 40.5 -0.69 -0.63 -0.56 -1.21 12.2 13.514.9 P
10/18/2019 48 30.8 40.9 47.8 38.8 40.5 42.5 -0.75 -0.71 -0.59 -1.21 10.8 11.914.3 P
10/19/2019 48 30.8 40.7 45.3 39.2 41.2 42.7 -0.62 -0.53 -0.31 -1.21 13.7 15.620.0 P
10/20/2019 48 29.2 37.3 44.7 38.4 40.1 41.6 -0.65 -0.54 -0.37 -1.21 13.1 15.418.8 P
10/21/2019 48 27.9 35.6 45.6 38.1 39.7 41.8 -0.68 -0.61 -0.56 -1.21 12.4 13.814.9 P
10/22/2019 48 38.4 40.3 44.2 40.1 40.9 42.0 -0.68 -0.58 -0.26 -1.21 12.5 14.421.1 P
10/23/2019 48 36.9 39.7 41.8 38.4 39.4 40.3 -0.40 -0.30 -0.12 -1.21 18.3 20.323.8 P
10/24/2019 48 31.6 38.7 43.6 39.0 39.7 41.1 -0.52 -0.44 -0.37 -1.21 15.7 17.318.9 P
10/25/2019 48 38.1 45.0 47.3 39.4 42.5 43.8 -0.53 -0.07 0.16 -1.21 15.6 24.6 29.3 P
10/26/2019 48 45.3 48.1 49.9 43.3 44.5 45.5 -0.13 0.11 0.29 -1.21 23.6 28.3 31.6 P
10/27/2019 48 44.6 46.5 48.7 42.9 43.5 44.6 -0.16 -0.01 0.22 -1.21 23.0 25.9 30.4 P
10/28/2019 48 39.2 43.4 46.7 41.6 42.8 43.5 -0.26 -0.14 0.05 -1.21 21.0 23.3 27.0 P
10/29/2019 48 31.0 39.5 48.5 39.6 41.5 43.3 -0.47 -0.37 -0.25 -1.21 16.9 18.721.1 P
10/30/2019 48 41.3 43.7 46.5 41.8 42.4 43.5 -0.55 -0.51 -0.46 -1.21 15.2 16.117.0 P
10/31/2019 48 39.8 44.7 50.5 41.6 43.2 44.2 -0.60 -0.54 -0.45 -1.21 14.0 15.417.3 P
11/1/2019 48 34.0 41.3 50.6 41.1 41.9 43.5 -0.70 -0.65 -0.59 -1.21 12.1 13.1 14.2 P
11/2/2019 48 36.0 43.2 47.6 40.7 42.1 43.5 -0.76 -0.72 -0.69 -1.21 10.8 11.6 12.2 P
11/3/2019 48 43.3 44.3 45.6 42.5 42.9 43.6 -0.77 -0.66 -0.52 -1.21 10.6 12.8 15.7 P
11/4/2019 48 42.7 43.7 45.3 42.2 42.6 42.9 -0.49 -0.28 -0.15 -1.21 16.3 20.7 23.2 P
11/5/2019 48 44.6 46.6 49.1 42.9 43.9 44.6 -0.43 -0.36 -0.26 -1.21 17.6 19.0 21.1 P
11/6/2019 48 43.3 45.5 47.4 42.9 43.7 44.0 -0.48 -0.39 -0.27 -1.21 16.5 18.5 20.9 P
11/7/2019 48 43.3 44.6 48.7 42.7 43.3 44.2 -0.55 -0.50 -0.44 -1.21 15.1 16.2 17.3 P
11/8/2019 48 43.5 45.9 48.2 43.1 43.7 44.4 -0.57 -0.53 -0.50 -1.21 14.7 15.5 16.1 P
11/9/2019 48 44.0 46.0 47.6 43.5 43.8 44.2 -0.58 -0.54 -0.51 -1.21 14.6 15.3 16.1 P
11/10/2019 48 43.1 44.4 45.6 42.7 43.2 43.6 -0.55 -0.50 -0.42 -1.21 15.2 16.117.7 P
11/11/2019 48 30.6 37.1 43.5 38.8 40.5 42.7 -0.56 -0.49 -0.28 -1.21 14.9 16.420.6 P
11/12/2019 48 38.4 42.3 44.7 40.9 41.5 42.4 -0.58 -0.55 -0.46 -1.21 14.4 15.217.0 P
11/13/2019 48 41.6 44.2 47.6 41.4 42.2 42.7 -0.63 -0.58 -0.51 -1.21 13.4 14.415.9 P
11/14/2019 48 26.9 34.1 42.2 35.0 38.6 42.4 -0.66 -0.61 -0.52 -1.21 12.8 13.815.7 P
11/15/2019 48 28.1 32.5 36.9 34.2 35.2 36.7 -0.72 -0.67 -0.62 -1.21 11.5 12.613.6 P
11/16/2019 48 31.2 34.3 40.1 36.5 37.1 38.4 -0.76 -0.73 -0.68 -1.21 10.7 11.512.3 P
11/17/2019 48 30.8 36.2 42.2 36.5 37.4 38.6 -0.81 -0.77 -0.69 -1.21 9.7 10.5 12.3 P
11/18/2019 48 39.0 43.4 45.8 37.7 39.3 40.7 -0.64 -0.40 0.00 -1.21 13.2 18.2 26.1 P
11/19/2019 48 35.0 40.4 45.3 38.8 39.9 41.3 -0.32 -0.17 0.18 -1.21 19.7 22.8 29.6 P
11/20/2019 48 34.8 37.6 42.9 37.5 38.3 39.2 -0.50 -0.41 -0.20 -1.21 16.1 18.122.1 P
11/21/2019 48 33.2 36.2 39.4 38.1 38.8 39.2 -0.53 -0.46 -0.32 -1.21 15.6 17.119.9 P
11/22/2019 48 30.6 33.8 36.3 35.2 37.0 38.1 -0.64 -0.58 -0.52 -1.21 13.2 14.615.8 P
11/23/2019 48 29.0 30.3 31.8 33.6 34.6 35.4 -0.70 -0.66 -0.62 -1.21 11.9 12.813.7 P
11/24/2019 48 23.0 30.2 35.8 33.6 34.8 36.3 -0.76 -0.72 -0.68 -1.21 10.6 11.612.4 P
11/25/2019 48 20.1 29.5 39.2 33.8 34.9 36.1 -0.82 -0.79 -0.76 -1.21 9.4 10.1 10.7 P
11/26/2019 48 38.8 41.5 44.0 36.0 37.3 38.3 -0.84 -0.63 -0.33 -1.21 9.0 13.3 19.5 P
11/27/2019 48 31.8 38.3 44.0 35.6 37.4 39.0 -0.46 -0.28 -0.11 -1.21 17.0 20.624.0 P
11/28/2019 48 31.8 33.7 35.6 34.4 35.0 35.6 -0.61 -0.53 -0.43 -1.21 13.9 15.517.6 P
11/29/2019 48 26.2 34.8 42.5 34.2 36.0 37.9 -0.68 -0.64 -0.58 -1.21 12.5 13.314.4 P
11/30/2019 48 32.2 34.6 36.3 34.8 36.4 37.3 -0.73 -0.69 -0.65 -1.21 11.4 12.213.0 P
12/1/2019 48 31.8 35.5 38.8 33.8 36.7 37.7 -0.72 -0.67 -0.61 -1.21 11.7 12.7 13.9 P
12/2/2019 48 25.0 31.4 33.6 34.2 34.8 35.2 -0.80 -0.75 -0.69 -1.21 9.8 10.9 12.2 P
12/3/2019 48 24.3 30.7 32.8 34.4 35.3 36.3 -0.86 -0.82 -0.79 -1.21 8.6 9.5 10.1 P
12/4/2019 48 29.8 33.3 37.5 34.8 36.2 37.3 -0.88 -0.85 -0.82 -1.21 8.2 8.7 9.4P
12/5/2019 48 33.2 39.4 44.9 36.7 37.8 39.0 -0.86 -0.80 -0.73 -1.21 8.6 9.8 11.3 P
12/6/2019 48 35.2 42.4 44.9 36.9 38.1 39.0 -0.72 -0.41 -0.24 -1.21 11.5 18.0 21.5 P
12/7/2019 48 24.1 31.0 36.9 35.2 36.0 36.7 -0.64 -0.54 -0.32 -1.21 13.3 15.4 19.8 P
12/8/2019 48 29.0 33.3 38.4 35.0 36.2 37.7 -0.71 -0.66 -0.63 -1.21 11.8 12.7 13.4 P
12/9/2019 48 29.2 34.3 39.4 34.0 35.4 36.9 -0.75 -0.71 -0.68 -1.21 10.9 11.8 12.5 P
12/10/2019 48 25.8 30.1 33.4 34.6 34.8 35.2 -0.83 -0.78 -0.74 -1.21 9.2 10.2 11.1 P
12/11/2019 48 31.4 33.1 34.8 33.4 34.3 35.2 -0.89 -0.84 -0.81 -1.21 7.9 9.0 9.7 P
12/12/2019 48 31.4 33.1 35.6 33.4 33.8 34.8 -0.91 -0.88 -0.84 -1.21 7.4 8.2 9.1 P
12/13/2019 48 20.3 30.0 38.3 32.6 34.1 36.3 -0.95 -0.92 -0.88 -1.21 6.6 7.2 8.1 P
12/14/2019 48 36.1 38.3 39.8 35.2 36.0 36.7 -0.90 -0.66 -0.57 -1.21 7.8 12.7 14.8 P
12/15/2019 48 33.6 37.1 39.2 35.8 36.4 36.9 -0.82 -0.68 -0.44 -1.21 9.4 12.3 17.4 P
12/16/2019 48 31.2 36.7 39.2 36.0 36.8 37.3 -0.63 -0.52 -0.36 -1.21 13.5 15.819.0 P
12/17/2019 48 35.2 36.8 38.8 37.1 37.5 38.1 -0.67 -0.64 -0.60 -1.21 12.6 13.314.1 P
12/18/2019 48 30.8 35.6 37.9 35.2 37.0 37.7 -0.71 -0.66 -0.63 -1.21 11.9 12.813.5 P
12/19/2019 48 30.4 32.5 35.2 34.2 35.0 35.8 -0.78 -0.74 -0.70 -1.21 10.2 11.212.1 P
12/20/2019 48 31.8 34.5 38.8 35.0 35.9 36.9 -0.82 -0.78 -0.74 -1.21 9.4 10.2 11.2 P
12/21/2019 48 27.5 32.4 40.1 32.0 34.6 36.0 -0.87 -0.83 -0.73 -1.21 8.3 9.1 11.4 P
12/22/2019 48 32.8 36.0 39.9 34.4 36.0 36.9 -0.83 -0.75 -0.67 -1.21 9.3 10.9 12.5 P
12/23/2019 48 26.0 33.9 37.7 32.8 35.1 36.3 -0.88 -0.83 -0.79 -1.21 8.1 9.3 10.2 P
12/24/2019 48 20.5 25.9 29.8 31.8 33.4 34.4 -0.91 -0.88 -0.82 -1.21 7.4 8.2 9.3 P
12/25/2019 48 23.9 25.6 28.8 31.8 31.8 32.0 -0.97 -0.92 -0.88 -1.21 6.1 7.2 8.2 P
12/26/2019 48 20.5 23.0 24.5 31.6 32.2 32.6 -0.98 -0.96 -0.92 -1.21 5.8 6.4 7.3 P
12/27/2019 48 17.0 19.8 21.7 30.2 31.0 31.8 -1.04 -0.99 -0.95 -1.21 4.5 5.6 6.5 P
12/28/2019 48 13.4 17.7 21.7 30.6 31.3 31.8 -1.01 -1.00 -0.98 -1.21 5.1 5.3 5.9 P:e
12/29/2019 48 14.1 17.0 20.1 29.8 31.4 32.0 -1.03 -1.02 -1.01 -1.21 4.8 4.9 5.1 P:e
12/30/2019 48 20.3 22.9 26.2 31.2 31.9 32.2 -1.04 -1.04 -1.03 -1.21 4.4 4.6 4.7 P:e
12/31/2019 48 16.8 18.6 21.4 30.4 30.8 31.2 -1.05 -1.05 -1.04 -1.21 4.1 4.3 4.4 P:e
1/1/2020 48 17.3 19.1 21.9 31.0 31.4 31.6 -1.07 -1.06 -1.06 -1.21 3.8 4.0 4.1 P:e
1/2/2020 48 20.1 21.8 23.2 31.6 31.8 31.8 -1.08 -1.07 -1.07 -1.21 3.6 3.7 3.8 P:e
1/3/2020 48 21.7 23.6 26.2 31.8 31.8 31.8 -1.09 -1.08 -1.08 -1.21 3.3 3.5 3.6 P:e
1/4/2020 48 23.0 25.3 26.9 31.8 32.0 32.2 -1.10 -1.09 -1.09 -1.21 3.1 3.2 3.3 P:e
12/3/2021
Daily, _SfkHydrology.xlsx
Page 11 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
1/5/2020 48 26.0 28.3 30.0 32.2 32.3 32.4 -1.10 -1.10 -1.10 -1.21 2.9 3.0 3.1 P:e
1/6/2020 48 27.5 28.1 28.6 31.8 32.3 32.4 -1.11 -1.11 -1.10 -1.21 2.7 2.8 2.9 P:e
1/7/2020 48 27.3 30.4 31.8 32.2 32.4 32.6 -1.12 -1.12 -1.11 -1.21 2.5 2.6 2.7 P:e
1/8/2020 48 29.4 32.3 36.7 31.8 32.8 35.2 -1.13 -1.12 -1.12 -1.21 2.4 2.5 2.5 P:e
1/9/2020 48 31.2 34.4 38.6 32.8 34.4 36.0 -1.13 -1.13 -1.13 -1.21 2.2 2.3 2.4 P:e
1/10/2020 48 29.8 37.0 42.4 32.6 34.1 35.4 -1.13 -0.91 -0.62 -1.21 2.1 7.4 13.6 P:e
1/11/2020 48 29.0 35.0 39.9 33.4 34.5 35.6 -1.00 -0.93 -0.85 -1.21 5.3 6.9 8.8P
1/12/2020 48 32.8 35.9 37.9 34.4 34.9 35.4 -1.01 -0.95 -0.87 -1.21 5.3 6.6 8.3P
1/13/2020 48 31.2 34.9 38.4 33.4 34.5 36.1 -1.04 -1.02 -1.00 -1.21 4.4 4.8 5.4P:e
1/14/2020 48 18.7 27.3 32.6 26.2 31.5 34.6 -1.07 -1.06 -1.04 -1.21 3.7 4.0 4.4P:e
1/15/2020 48 19.6 32.3 36.1 26.0 31.6 33.6 -1.09 -1.08 -1.07 -1.21 3.3 3.5 3.7P:e
1/16/2020 48 29.4 33.3 35.0 31.8 33.0 33.6 -1.10 -1.10 -1.09 -1.21 2.9 3.1 3.3P:e
1/17/2020 48 21.7 30.4 34.2 31.4 31.8 32.0 -1.12 -1.11 -1.10 -1.21 2.6 2.7 2.9P:e
1/18/2020 48 13.4 19.9 27.3 22.1 25.8 31.0 -1.13 -1.12 -1.12 -1.21 2.3 2.5 2.6P:e
1/19/2020 48 13.4 17.8 23.4 21.7 24.3 27.1 -1.14 -1.13 -1.13 -1.21 2.1 2.2 2.3P:e
1/20/2020 48 12.4 22.0 28.6 21.7 26.3 29.4 -1.14 -1.14 -1.14 -1.21 1.9 2.0 2.1P:e
1/21/2020 48 16.3 24.1 31.6 23.9 27.4 31.4 -1.15 -1.15 -1.15 -1.21 1.7 1.8 1.9P:e
1/22/2020 48 11.1 22.0 26.7 21.0 25.5 28.1 -1.16 -1.16 -1.15 -1.21 1.5 1.6 1.7P:e
1/23/2020 48 10.3 20.5 26.7 19.6 24.0 27.5 -1.16 -1.16 -1.16 -1.21 1.4 1.4 1.5P:e
1/24/2020 48 18.0 20.4 24.1 21.9 23.8 26.5 -1.17 -1.17 -1.16 -1.21 1.2 1.3 1.4P:e
1/25/2020 48 19.6 21.8 25.6 23.2 24.3 26.2 -1.18 -1.17 -1.17 -1.21 1.1 1.1 1.2P:e
1/26/2020 48 15.8 19.0 22.1 19.4 22.0 24.3 -1.18 -1.18 -1.18 -1.21 0.9 1.0 1.1P:e
1/27/2020 48 11.6 13.7 17.5 15.8 17.8 20.5 -1.18 -1.18 -1.18 -1.21 0.8 0.9 0.9P:e
1/28/2020 48 6.8 10.8 13.1 14.1 16.3 17.7 -1.19 -1.19 -1.18 -1.21 0.7 0.7 0.8 P:e
1/29/2020 48 6.2 9.5 13.1 13.6 16.2 20.1 -1.19 -1.19 -1.19 -1.21 0.6 0.6 0.7 P:e
1/30/2020 48 12.6 16.8 20.3 19.8 21.5 23.0 -1.20 -1.19 -1.19 -1.21 0.5 0.5 0.6P:e
1/31/2020 48 5.6 17.9 25.6 21.0 23.4 26.2 -1.20 -1.20 -1.20 -1.21 0.3 0.4 0.5 P:e
2/1/2020 48 16.1 28.8 35.0 23.7 29.0 32.4 -1.20 -1.20 -1.20 -1.21 0.2 0.3 0.3 P:e
2/2/2020 48 32.0 37.2 43.1 32.6 34.8 38.4 -1.21 -1.21 -1.20 -1.21 0.1 0.2 0.2 P:e
2/3/2020 48 33.4 35.2 37.7 32.2 33.6 35.2 -1.21 -1.18 -1.02 -1.21 0.1 1.0 5.0 P:e
2/4/2020 48 32.4 35.9 39.2 33.8 34.3 35.0 -1.03 -0.96 -0.92 -1.21 4.8 6.3 7.3 P
2/5/2020 48 31.8 34.0 36.7 32.2 33.5 34.4 -1.07 -1.04 -1.01 -1.21 3.8 4.4 5.3 P:e
2/6/2020 48 31.8 32.6 37.1 32.0 32.8 34.0 -1.10 -1.09 -1.07 -1.21 3.0 3.4 3.8 P:e
2/7/2020 48 28.1 32.5 38.1 31.8 32.5 34.4 -1.12 -1.08 -0.78 -1.21 2.5 3.4 10.3P:e
2/8/2020 48 31.8 34.0 36.7 31.8 32.7 33.4 -0.93 -0.85 -0.70 -1.21 6.9 8.7 11.9P
2/9/2020 48 25.0 31.1 37.7 31.6 33.1 35.4 -1.02 -1.00 -0.95 -1.21 4.8 5.4 6.7 P:e
2/10/2020 48 22.8 30.0 37.7 30.2 32.0 33.6 -1.05 -1.04 -1.02 -1.21 4.1 4.5 4.8P:e
2/11/2020 48 29.4 32.6 34.8 31.8 33.1 33.8 -1.07 -1.07 -1.05 -1.21 3.6 3.9 4.1P:e
2/12/2020 48 21.2 28.0 32.4 26.5 30.3 31.8 -1.09 -1.08 -1.08 -1.21 3.2 3.4 3.6P:e
2/13/2020 48 23.2 33.7 41.6 27.1 32.3 36.9 -1.10 -1.10 -1.09 -1.21 2.9 3.1 3.2P:e
2/14/2020 48 33.0 35.6 38.4 32.8 34.8 36.7 -1.11 -1.11 -1.10 -1.21 2.6 2.8 2.9P:e
2/15/2020 48 26.5 34.1 43.3 31.6 34.2 38.8 -1.12 -1.12 -1.12 -1.21 2.4 2.5 2.6P:e
2/16/2020 48 27.1 36.1 43.5 31.8 34.2 36.3 -1.13 -1.03 -0.76 -1.21 2.3 4.6 10.7 P:e
2/17/2020 48 31.8 33.2 38.6 32.2 32.9 34.2 -0.92 -0.72 -0.39 -1.21 7.1 11.5 18.4 P
2/18/2020 48 24.7 31.8 35.0 32.6 33.5 34.4 -1.01 -0.97 -0.92 -1.21 5.3 6.1 7.2P:e
2/19/2020 48 22.8 31.9 39.9 32.2 33.4 36.1 -1.05 -1.03 -1.01 -1.21 4.3 4.7 5.2P:e
2/20/2020 48 23.0 27.3 32.0 29.0 31.4 33.8 -1.08 -1.06 -1.05 -1.21 3.6 3.9 4.3P:e
2/21/2020 48 19.4 22.4 28.8 27.3 28.7 30.8 -1.10 -1.09 -1.08 -1.21 3.0 3.3 3.6P:e
2/22/2020 48 11.8 19.5 28.8 26.2 28.4 31.0 -1.12 -1.11 -1.10 -1.21 2.6 2.8 3.0P:e
2/23/2020 48 23.4 27.3 32.0 28.6 29.3 30.8 -1.13 -1.13 -1.12 -1.21 2.2 2.4 2.6P:e
2/24/2020 48 25.6 29.7 34.6 29.0 30.5 31.8 -1.15 -1.14 -1.13 -1.21 1.8 2.0 2.2P:e
2/25/2020 48 25.8 29.1 31.8 29.8 31.0 31.8 -1.16 -1.15 -1.15 -1.21 1.5 1.7 1.8P:e
2/26/2020 48 25.4 28.8 31.8 26.0 29.9 31.8 -1.17 -1.16 -1.16 -1.21 1.2 1.4 1.5P:e
2/27/2020 48 23.0 29.7 36.5 31.4 31.8 32.2 -1.18 -1.17 -1.17 -1.21 1.0 1.1 1.2P:e
2/28/2020 48 15.3 26.9 36.0 24.7 30.2 32.0 -1.19 -1.18 -1.18 -1.21 0.7 0.8 1.0P:e
2/29/2020 48 31.8 35.7 40.7 32.0 32.8 34.0 -1.19 -0.75 -0.24 -1.21 0.6 10.6 21.3 P:e
3/1/2020 48 28.6 35.6 41.3 34.0 34.9 36.9 -0.92 -0.81 -0.66 -1.21 7.3 9.6 12.8P
3/2/2020 48 20.5 27.4 31.2 30.6 33.2 34.2 -1.00 -0.96 -0.90 -1.21 5.3 6.3 7.6 P:e
3/3/2020 48 16.1 20.6 23.9 27.3 29.6 30.4 -1.04 -1.02 -1.01 -1.21 4.5 4.8 5.3 P:e
3/4/2020 48 17.3 26.1 31.4 27.3 29.9 31.8 -1.07 -1.05 -1.04 -1.21 3.8 4.1 4.4 P:e
3/5/2020 48 25.2 30.3 35.6 30.4 31.3 31.8 -1.09 -1.08 -1.07 -1.21 3.3 3.6 3.8 P:e
3/6/2020 48 31.8 36.5 44.9 31.8 34.4 40.3 -1.10 -1.10 -1.09 -1.21 2.9 3.1 3.3 P:e
3/7/2020 48 32.6 37.5 48.0 33.4 35.9 40.9 -1.12 -1.11 -1.10 -1.21 2.5 2.7 2.9 P:e
3/8/2020 48 32.4 39.5 49.1 33.6 36.6 41.1 -1.13 -1.13 -1.12 -1.21 2.2 2.4 2.5 P:e
3/9/2020 48 20.5 30.5 39.2 24.3 32.9 37.9 -1.14 -1.14 -1.13 -1.21 1.9 2.1 2.2 P:e
3/10/2020 48 18.2 22.5 30.0 23.7 26.4 31.2 -1.15 -1.15 -1.14 -1.21 1.7 1.8 1.9P:e
3/11/2020 48 17.3 22.1 30.0 22.6 25.4 28.8 -1.16 -1.16 -1.15 -1.21 1.4 1.5 1.7P:e
3/12/2020 48 15.1 28.1 38.4 21.7 28.4 34.0 -1.17 -1.17 -1.16 -1.21 1.2 1.3 1.4P:e
3/13/2020 48 32.4 33.8 36.0 32.4 33.6 35.0 -1.18 -1.17 -0.98 -1.21 1.0 1.2 5.9P:e
3/14/2020 48 33.2 35.5 39.0 33.4 34.7 36.1 -1.05 -1.00 -0.88 -1.21 4.3 5.4 8.1P:e
3/15/2020 48 33.2 35.9 39.2 33.8 35.0 36.5 -1.07 -0.98 -0.77 -1.21 3.8 5.9 10.5 P:e
3/16/2020 48 34.0 36.1 39.0 34.2 34.9 36.0 -0.90 -0.77 -0.53 -1.21 7.6 10.5 15.5 P
3/17/2020 48 34.2 39.2 51.3 34.6 35.5 37.9 -0.76 -0.69 -0.62 -1.21 10.7 12.3 13.7 P
3/18/2020 48 28.8 36.1 44.6 34.6 35.5 36.9 -0.80 -0.76 -0.70 -1.21 9.8 10.6 12.1 P
3/19/2020 48 28.3 39.5 53.6 34.6 35.6 37.5 -0.75 -0.60 -0.52 -1.21 10.9 14.1 15.8 P
3/20/2020 48 26.5 34.1 40.9 34.4 35.4 36.7 -0.76 -0.71 -0.64 -1.21 10.7 11.8 13.3 P
3/21/2020 48 31.2 36.0 44.4 35.0 36.1 38.3 -0.81 -0.77 -0.74 -1.21 9.7 10.6 11.2 P
3/22/2020 48 27.9 34.1 49.9 33.8 35.4 38.4 -0.86 -0.83 -0.79 -1.21 8.5 9.3 10.1 P
3/23/2020 48 24.7 35.4 47.8 34.0 35.8 38.4 -0.89 -0.86 -0.83 -1.21 7.8 8.6 9.2P
3/24/2020 48 36.5 42.5 53.3 36.0 36.7 38.8 -0.89 -0.73 -0.49 -1.21 8.0 11.4 16.4 P
3/25/2020 48 36.0 40.8 52.4 35.0 35.9 38.6 -0.57 -0.45 -0.31 -1.21 14.6 17.1 20.0 P
3/26/2020 48 36.3 43.6 55.5 35.4 36.0 37.5 -0.39 -0.34 -0.29 -1.21 18.5 19.5 20.3 P
3/27/2020 48 28.1 40.4 55.0 34.6 36.0 37.7 -0.39 -0.27 -0.13 -1.21 18.3 20.8 23.5 P
3/28/2020 48 25.4 30.9 37.5 34.0 35.0 35.6 -0.58 -0.48 -0.36 -1.21 14.5 16.6 19.1 P
3/29/2020 48 17.5 27.1 35.8 33.8 34.8 37.5 -0.71 -0.64 -0.57 -1.21 11.7 13.3 14.7 P
3/30/2020 48 17.0 29.3 42.9 33.6 35.1 36.9 -0.78 -0.73 -0.69 -1.21 10.4 11.4 12.2 P
3/31/2020 48 33.4 37.4 45.5 35.4 36.9 39.2 -0.80 -0.77 -0.74 -1.21 9.9 10.5 11.1 P
4/1/2020 48 31.0 34.2 38.8 34.8 36.3 38.1 -0.84 -0.80 -0.75 -1.21 8.9 9.8 10.8P
4/2/2020 48 29.0 34.2 44.7 33.8 35.8 39.2 -0.90 -0.87 -0.84 -1.21 7.8 8.4 9.0 P
4/3/2020 48 28.6 44.0 69.8 34.6 37.5 43.6 -0.92 -0.87 -0.79 -1.21 7.2 8.3 10.1P
4/4/2020 48 33.0 45.5 56.9 35.6 37.3 41.1 -0.85 -0.77 -0.62 -1.21 8.8 10.6 13.6 P
4/5/2020 48 31.0 36.0 41.3 34.8 35.8 37.9 -0.83 -0.77 -0.67 -1.21 9.1 10.5 12.7 P
12/3/2021
Daily, _SfkHydrology.xlsx
Page 12 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
4/6/2020 48 23.7 31.8 45.5 33.4 35.1 38.3 -0.87 -0.85 -0.81 -1.21 8.3 8.8 9.7 P
4/7/2020 48 26.0 28.7 34.4 31.8 32.7 34.2 -0.94 -0.89 -0.86 -1.21 6.8 7.8 8.6 P
4/8/2020 48 15.1 33.4 51.3 30.8 34.8 39.8 -0.97 -0.94 -0.92 -1.21 6.1 6.8 7.1 P
4/9/2020 48 27.9 37.2 49.1 33.2 36.1 40.1 -0.97 -0.94 -0.91 -1.21 6.0 6.7 7.5 P
4/10/2020 48 33.4 37.2 44.2 34.6 35.9 38.4 -0.99 -0.96 -0.94 -1.21 5.6 6.2 6.9P
4/11/2020 48 32.8 36.3 39.0 34.8 36.0 37.5 -1.00 -0.90 -0.62 -1.21 5.5 7.7 13.7 P
4/12/2020 48 34.6 39.8 47.4 35.4 36.3 38.3 -0.65 -0.61 -0.56 -1.21 13.1 14.0 14.9 P
4/13/2020 48 34.6 38.1 41.6 35.2 35.9 36.9 -0.72 -0.58 -0.22 -1.21 11.5 14.4 21.8 P
4/14/2020 48 36.0 38.9 42.7 35.2 36.0 36.9 -0.55 -0.47 -0.37 -1.21 15.1 16.8 18.9 P
4/15/2020 48 35.2 40.4 54.1 35.6 36.6 39.9 -0.54 -0.46 -0.36 -1.21 15.2 17.1 18.9 P
4/16/2020 48 37.3 39.8 43.3 36.0 36.3 36.9 -0.41 -0.26 0.05 -1.21 18.0 21.1 27.1 P
4/17/2020 48 37.7 40.6 43.6 34.4 35.5 36.1 0.02 0.25 0.48 -1.21 26.5 30.9 35.2P
4/18/2020 48 37.7 39.9 44.9 36.1 36.8 38.3 -0.20 -0.10 0.09 -1.21 22.2 24.1 27.8 P
4/19/2020 48 36.3 40.8 48.2 36.5 37.1 38.4 -0.39 -0.33 -0.22 -1.21 18.4 19.6 21.9 P
4/20/2020 48 36.1 40.8 46.2 36.5 37.1 38.1 -0.51 -0.46 -0.39 -1.21 16.0 17.0 18.4 P
4/21/2020 48 38.4 41.6 50.1 36.7 37.1 38.1 -0.52 -0.47 -0.43 -1.21 15.8 16.8 17.6 P
4/22/2020 48 33.4 43.3 55.4 36.3 37.6 40.5 -0.50 -0.46 -0.39 -1.21 16.1 17.0 18.5 P
4/23/2020 48 31.8 40.4 50.5 35.8 37.5 40.7 -0.58 -0.51 -0.44 -1.21 14.5 16.0 17.5 P
4/24/2020 48 35.8 40.7 53.3 36.3 37.3 39.8 -0.61 -0.56 -0.47 -1.21 13.9 15.0 16.8 P
4/25/2020 48 30.0 43.0 55.4 36.0 37.9 41.4 -0.67 -0.62 -0.57 -1.21 12.7 13.7 14.7 P
4/26/2020 48 29.2 43.3 57.6 35.8 38.1 42.0 -0.71 -0.65 -0.57 -1.21 11.8 13.1 14.8 P
4/27/2020 48 32.4 38.6 49.2 34.8 37.4 41.8 -0.73 -0.67 -0.60 -1.21 11.4 12.6 14.1 P
4/28/2020 48 30.0 37.3 51.3 34.6 37.0 42.2 -0.79 -0.74 -0.68 -1.21 10.1 11.2 12.4 P
4/29/2020 48 27.7 38.0 51.5 34.6 37.0 40.9 -0.83 -0.78 -0.73 -1.21 9.2 10.2 11.3 P
4/30/2020 48 29.0 37.9 46.5 35.0 37.0 39.0 -0.87 -0.83 -0.78 -1.21 8.2 9.2 10.2 P
5/1/2020 48 26.7 39.1 55.9 35.0 37.6 42.2 -0.90 -0.87 -0.84 -1.21 7.6 8.2 9.0 P
5/2/2020 48 25.6 38.2 56.8 34.8 37.5 42.4 -0.91 -0.89 -0.85 -1.21 7.4 8.0 8.7 P
5/3/2020 48 34.6 42.1 53.4 35.4 39.0 45.1 -0.93 -0.85 -0.74 -1.21 7.0 8.7 11.1P
5/4/2020 48 32.6 40.3 57.8 35.0 37.9 44.6 -0.90 -0.84 -0.78 -1.21 7.7 9.0 10.2P
5/5/2020 48 30.6 38.4 51.7 35.0 37.8 43.8 -0.93 -0.88 -0.85 -1.21 7.0 8.1 8.9 P
5/6/2020 48 32.8 46.1 62.9 36.3 39.8 45.3 -0.93 -0.81 -0.62 -1.21 6.9 9.6 13.7P
5/7/2020 48 27.1 44.6 63.5 35.4 39.2 45.8 -0.86 -0.72 -0.55 -1.21 8.5 11.5 15.0 P
5/8/2020 48 35.4 48.2 65.0 36.0 39.4 44.7 -0.81 -0.72 -0.63 -1.21 9.7 11.5 13.5 P
5/9/2020 48 40.3 42.2 44.0 37.5 38.0 38.4 -0.71 -0.61 -0.54 -1.21 11.9 13.8 15.4 P
5/10/2020 48 39.9 40.8 42.0 36.7 37.3 37.7 -0.58 -0.42 -0.20 -1.21 14.5 17.7 22.2 P
5/11/2020 48 39.9 42.0 49.4 36.9 37.4 38.3 -0.49 -0.37 -0.23 -1.21 16.3 18.7 21.5 P
5/12/2020 48 38.8 43.5 53.4 37.3 38.3 41.3 -0.59 -0.53 -0.47 -1.21 14.4 15.5 16.7 P
5/13/2020 48 39.9 42.1 48.2 37.3 38.0 39.2 -0.64 -0.60 -0.55 -1.21 13.3 14.0 15.2 P
5/14/2020 48 37.5 45.0 57.6 36.9 38.5 41.6 -0.69 -0.63 -0.54 -1.21 12.2 13.5 15.3 P
5/15/2020 48 38.6 43.6 51.7 37.5 38.7 40.1 -0.75 -0.71 -0.67 -1.21 11.0 11.9 12.7 P
5/16/2020 48 40.5 42.5 45.6 38.1 38.5 39.2 -0.69 -0.62 -0.53 -1.21 12.2 13.7 15.5 P
5/17/2020 48 40.9 41.8 44.2 37.7 38.2 39.4 -0.62 -0.49 -0.25 -1.21 13.7 16.4 21.2 P
5/18/2020 48 39.6 48.0 59.0 37.1 39.1 41.8 -0.46 -0.35 -0.20 -1.21 16.9 19.1 22.1 P
5/19/2020 48 42.0 48.5 66.2 37.7 39.7 42.2 -0.57 -0.52 -0.47 -1.21 14.8 15.8 16.8 P
5/20/2020 48 41.4 44.0 49.4 38.1 38.9 39.2 -0.56 -0.29 0.09 -1.21 14.9 20.4 27.9 P
5/21/2020 48 40.1 41.3 42.9 37.9 38.3 38.8 -0.27 -0.22 -0.13 -1.21 20.8 21.8 23.5 P
5/22/2020 48 38.6 42.3 52.1 37.5 38.7 40.7 -0.36 -0.24 -0.07 -1.21 19.1 21.5 24.8 P
5/23/2020 48 35.6 42.2 54.5 37.7 39.0 41.6 -0.49 -0.43 -0.37 -1.21 16.4 17.6 18.9 P
5/24/2020 48 30.6 39.7 49.1 36.7 38.8 41.4 -0.58 -0.51 -0.43 -1.21 14.5 15.9 17.6 P
5/25/2020 48 33.6 43.4 54.3 37.3 39.3 41.3 -0.56 -0.52 -0.43 -1.21 15.0 15.8 17.7 P
5/26/2020 48 37.1 46.0 66.4 38.4 40.3 44.0 -0.64 -0.60 -0.55 -1.21 13.2 14.0 15.2 P
5/27/2020 48 29.8 44.9 65.7 36.7 40.3 45.1 -0.69 -0.66 -0.61 -1.21 12.2 12.9 14.0 P
5/28/2020 48 28.8 47.4 65.5 36.9 41.5 47.3 -0.74 -0.69 -0.64 -1.21 11.2 12.2 13.2 P
5/29/2020 48 28.6 47.1 64.7 37.3 42.0 49.1 -0.75 -0.69 -0.60 -1.21 10.9 12.3 14.1 P
5/30/2020 48 41.6 43.4 45.1 39.6 40.0 40.3 -0.70 -0.39 -0.14 -1.21 11.9 18.3 23.3 P
5/31/2020 48 43.5 44.9 48.7 39.4 39.9 40.3 -0.25 0.02 0.25 -1.21 21.2 26.4 30.9 P
6/1/2020 48 42.5 45.0 52.6 39.4 39.9 41.3 -0.35 -0.22 -0.07 -1.21 19.2 21.8 24.7 P
6/2/2020 48 37.1 49.5 65.0 39.0 41.9 47.6 -0.48 -0.42 -0.35 -1.21 16.6 17.9 19.2 P
6/3/2020 48 37.1 54.7 71.3 39.6 43.1 49.6 -0.55 -0.50 -0.43 -1.21 15.1 16.2 17.5 P
6/4/2020 48 35.2 48.7 67.1 39.2 42.4 48.3 -0.60 -0.56 -0.51 -1.21 14.0 15.0 16.0 P
6/5/2020 48 42.4 45.4 58.0 39.8 41.1 43.8 -0.68 -0.64 -0.57 -1.21 12.5 13.2 14.7 P
6/6/2020 48 41.6 45.4 54.7 40.1 41.2 43.3 -0.73 -0.71 -0.66 -1.21 11.4 11.9 12.9 P
6/7/2020 48 40.5 42.8 45.3 39.9 40.6 41.3 -0.76 -0.69 -0.55 -1.21 10.7 12.2 15.1 P
6/8/2020 48 39.9 44.7 54.3 39.6 41.1 43.8 -0.73 -0.70 -0.63 -1.21 11.4 12.1 13.6 P
6/9/2020 48 39.6 51.9 69.4 38.8 44.0 51.9 -0.76 -0.71 -0.64 -1.21 10.6 11.7 13.2 P
6/10/2020 48 31.4 47.1 64.8 39.0 42.8 47.3 -0.81 -0.76 -0.69 -1.21 9.7 10.7 12.1 P
6/11/2020 48 43.8 48.6 61.4 42.0 43.3 46.0 -0.78 -0.76 -0.71 -1.21 10.3 10.8 11.7 P
6/12/2020 48 44.6 46.6 51.5 42.0 42.6 43.6 -0.80 -0.77 -0.74 -1.21 10.0 10.5 11.1 P
6/13/2020 48 44.0 46.0 54.7 41.4 42.0 43.3 -0.78 -0.74 -0.71 -1.21 10.3 11.1 11.8 P
6/14/2020 48 43.8 46.1 49.2 41.4 42.0 42.9 -0.79 -0.77 -0.73 -1.21 10.0 10.6 11.4 P
6/15/2020 48 43.3 48.3 56.8 41.1 42.6 44.6 -0.81 -0.78 -0.74 -1.21 9.6 10.3 11.1 P
6/16/2020 48 46.0 47.5 51.0 42.4 43.1 44.2 -0.81 -0.61 -0.39 -1.21 9.7 13.9 18.5 P
6/17/2020 48 46.2 48.9 56.6 42.7 43.7 45.8 -0.33 -0.22 -0.09 -1.21 19.6 21.8 24.3 P
6/18/2020 48 46.5 49.3 56.6 42.5 43.8 47.8 -0.43 -0.35 -0.28 -1.21 17.5 19.2 20.6 P
6/19/2020 48 42.7 49.5 64.3 41.6 43.4 45.8 -0.57 -0.51 -0.44 -1.21 14.7 16.0 17.5 P
6/20/2020 48 40.1 49.1 56.1 41.1 43.2 44.9 -0.62 -0.60 -0.57 -1.21 13.6 14.2 14.8 P
6/21/2020 48 44.6 51.2 66.0 42.4 44.3 49.1 -0.66 -0.62 -0.57 -1.21 12.8 13.8 14.7 P
6/22/2020 48 43.5 55.4 70.1 42.2 45.7 51.7 -0.75 -0.70 -0.66 -1.21 11.0 12.0 12.8 P
6/23/2020 48 35.6 52.3 72.5 41.3 45.6 51.5 -0.79 -0.76 -0.72 -1.21 10.0 10.7 11.6 P
6/24/2020 48 36.9 51.5 67.6 42.2 45.9 52.4 -0.85 -0.81 -0.77 -1.21 8.8 9.6 10.6 P
6/25/2020 48 44.4 50.8 61.9 43.6 46.2 51.5 -0.89 -0.85 -0.81 -1.21 8.0 8.8 9.7P
6/26/2020 48 37.5 51.1 68.1 41.8 45.4 49.9 -0.92 -0.90 -0.87 -1.21 7.2 7.7 8.4P
6/27/2020 48 44.6 47.7 52.4 43.8 45.2 46.7 -0.92 -0.73 -0.52 -1.21 7.2 11.3 15.8 P
6/28/2020 48 44.6 51.7 64.3 43.8 46.3 51.0 -0.80 -0.72 -0.61 -1.21 9.9 11.6 14.0 P
6/29/2020 48 42.2 48.9 55.0 43.6 44.6 45.5 -0.85 -0.82 -0.76 -1.21 8.7 9.5 10.6 P
6/30/2020 48 44.4 53.6 65.7 43.1 47.2 53.1 -0.88 -0.85 -0.82 -1.21 8.2 8.7 9.4P
7/1/2020 48 44.9 52.2 61.4 44.6 47.6 51.0 -0.90 -0.87 -0.82 -1.21 7.8 8.4 9.5 P
7/2/2020 48 48.7 51.3 57.8 46.7 48.2 49.9 -0.90 -0.88 -0.86 -1.21 7.6 8.0 8.6 P
7/3/2020 48 48.3 55.4 66.7 46.4 49.4 52.9 -0.93 -0.90 -0.86 -1.21 7.1 7.8 8.6 P
7/4/2020 48 51.0 55.3 67.7 48.7 50.8 55.4 -0.94 -0.91 -0.88 -1.21 6.8 7.5 8.2 P
7/5/2020 48 47.4 53.0 60.5 48.3 49.9 53.1 -0.97 -0.95 -0.91 -1.21 6.0 6.5 7.4 P
7/6/2020 48 46.4 54.3 67.1 45.8 50.8 56.6 -0.99 -0.97 -0.93 -1.21 5.5 6.2 7.0 P
12/3/2021
Daily, _SfkHydrology.xlsx
Page 13 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
7/7/2020 48 40.5 53.6 67.6 44.6 50.2 55.7 -1.03 -1.01 -0.99 -1.21 4.6 5.1 5.6 P
7/8/2020 48 46.5 49.8 57.3 47.3 49.0 51.7 -1.03 -1.02 -1.00 -1.21 4.7 4.9 5.5 P
7/9/2020 48 46.4 54.0 67.1 45.5 51.1 58.5 -1.03 -1.02 -1.01 -1.21 4.6 4.9 5.2 P
7/10/2020 48 44.0 53.8 64.5 45.3 51.5 59.0 -1.04 -1.03 -1.00 -1.21 4.4 4.8 5.3P
7/11/2020 48 47.4 53.7 63.1 48.2 51.2 55.4 -1.02 -1.00 -0.98 -1.21 4.9 5.3 5.8P
7/12/2020 48 48.0 53.2 61.6 48.2 50.8 54.3 -1.00 -0.99 -0.98 -1.21 5.4 5.6 5.8P
7/13/2020 48 49.1 55.8 68.1 48.7 52.6 58.8 -1.00 -0.99 -0.98 -1.21 5.4 5.7 5.9P
7/14/2020 48 49.9 52.3 56.6 49.6 51.1 53.1 -0.99 -0.98 -0.97 -1.21 5.6 5.9 6.1P
7/15/2020 48 50.3 52.2 57.3 48.7 49.9 51.7 -0.99 -0.67 0.10 -1.21 5.6 12.5 28.1 P
7/16/2020 48 48.9 53.5 59.2 47.8 49.6 51.5 -0.87 -0.80 -0.71 -1.21 8.4 9.8 11.9 P
7/17/2020 48 49.4 54.0 61.4 48.0 49.9 52.4 -0.91 -0.88 -0.85 -1.21 7.3 8.1 8.8P
7/18/2020 48 50.3 54.2 61.2 48.3 49.9 51.9 -0.94 -0.91 -0.89 -1.21 6.8 7.4 7.9P
7/19/2020 48 50.3 57.0 67.2 48.3 51.3 55.7 -0.96 -0.94 -0.91 -1.21 6.3 6.8 7.4P
7/20/2020 48 50.3 56.3 63.8 49.4 51.2 53.1 -0.99 -0.96 -0.88 -1.21 5.5 6.3 8.0P
7/21/2020 48 46.5 54.5 65.5 47.1 50.3 53.4 -1.00 -0.98 -0.95 -1.21 5.3 6.0 6.5P
7/22/2020 48 44.4 53.1 63.8 47.3 50.2 53.6 -1.01 -0.99 -0.97 -1.21 5.3 5.6 6.0P
7/23/2020 48 49.9 54.9 68.4 49.9 52.0 57.4 -1.01 -0.99 -0.97 -1.21 5.2 5.5 6.0P
7/24/2020 48 46.7 52.2 58.5 47.6 49.8 52.1 -1.01 -1.00 -0.98 -1.21 5.1 5.3 5.9P
7/25/2020 48 47.1 52.4 59.9 47.4 50.0 52.9 -1.02 -1.00 -0.99 -1.21 5.0 5.3 5.7P
7/26/2020 48 46.7 51.2 55.7 47.4 49.3 51.0 -1.01 -1.00 -1.00 -1.21 5.1 5.3 5.5P
7/27/2020 48 46.5 52.9 60.7 46.9 49.9 53.3 -1.02 -1.01 -0.98 -1.21 4.9 5.2 6.0P
7/28/2020 48 38.3 53.0 65.9 42.9 51.5 62.9 -0.99 -0.98 -0.97 -1.21 5.6 5.8 6.0P
7/29/2020 48 49.2 52.9 58.8 49.6 50.2 51.3 -0.99 -0.88 -0.60 -1.21 5.6 8.0 14.0 P
7/30/2020 48 48.5 52.7 61.9 48.2 50.0 52.8 -0.98 -0.93 -0.87 -1.21 5.9 7.0 8.4P
7/31/2020 48 47.8 51.4 57.3 47.8 49.7 53.1 -0.96 -0.93 -0.90 -1.21 6.3 6.9 7.6P
8/1/2020 48 47.6 54.6 67.7 47.3 50.0 55.2 -0.99 -0.97 -0.94 -1.21 5.5 6.2 6.8 P
8/2/2020 48 47.6 54.3 65.0 48.3 51.0 56.2 -1.01 -0.99 -0.96 -1.21 5.2 5.6 6.3 P
8/3/2020 48 46.0 52.7 62.9 47.3 50.0 53.8 -1.01 -1.00 -1.00 -1.21 5.1 5.3 5.5 P
8/4/2020 48 50.5 55.7 62.8 50.1 51.9 55.2 -1.01 -1.00 -0.98 -1.21 5.1 5.4 5.8 P
8/5/2020 48 49.4 53.4 59.9 49.1 51.0 54.7 -1.01 -0.95 -0.83 -1.21 5.1 6.4 9.1 P
8/6/2020 48 46.9 48.8 50.3 47.1 48.4 49.9 -1.00 -0.65 -0.14 -1.21 5.4 12.9 23.3 P
8/7/2020 48 46.7 51.7 60.7 45.3 47.7 50.5 -0.74 -0.66 -0.52 -1.21 11.1 12.8 15.7 P
8/8/2020 48 45.3 49.4 55.7 45.8 46.7 47.6 -0.81 -0.77 -0.72 -1.21 9.6 10.5 11.6 P
8/9/2020 48 43.8 50.3 60.9 45.3 46.6 49.4 -0.86 -0.83 -0.79 -1.21 8.5 9.2 10.0P
8/10/2020 48 45.3 48.5 52.9 45.1 46.1 47.1 -0.89 -0.87 -0.85 -1.21 7.9 8.3 8.9P
8/11/2020 48 48.0 50.4 54.0 46.2 47.2 48.5 -0.88 -0.80 -0.74 -1.21 8.2 9.8 11.1 P
8/12/2020 48 48.2 52.3 58.3 46.7 48.2 50.1 -0.86 -0.83 -0.79 -1.21 8.4 9.2 10.0 P
8/13/2020 48 42.4 48.5 51.2 45.8 47.0 48.2 -0.89 -0.68 -0.15 -1.21 7.9 12.2 23.2 P
8/14/2020 48 49.2 55.6 64.3 47.1 50.0 55.7 -0.63 -0.50 -0.24 -1.21 13.5 16.1 21.5 P
8/15/2020 48 49.2 54.1 59.7 46.4 49.3 53.8 -0.73 -0.68 -0.62 -1.21 11.3 12.5 13.7 P
8/16/2020 48 40.9 53.2 64.3 44.2 48.1 52.9 -0.78 -0.75 -0.69 -1.21 10.2 11.0 12.2 P
8/17/2020 48 49.8 50.9 52.9 47.6 48.4 49.4 -0.80 -0.68 -0.48 -1.21 9.9 12.3 16.6 P
8/18/2020 48 49.6 50.4 51.5 47.1 48.1 48.9 -0.47 0.11 0.27 -1.21 16.7 28.2 31.4 P
8/19/2020 48 45.1 54.6 64.8 46.0 47.4 49.4 -0.38 -0.21 0.01 -1.21 18.6 21.9 26.3 P
8/20/2020 48 40.7 51.3 62.9 44.4 47.6 53.1 -0.56 -0.47 -0.36 -1.21 15.0 16.7 18.9 P
8/21/2020 48 47.3 52.4 60.7 45.5 47.1 49.1 -0.68 -0.61 -0.54 -1.21 12.4 13.8 15.3 P
8/22/2020 48 44.9 53.4 66.0 45.5 47.7 50.6 -0.75 -0.70 -0.64 -1.21 10.9 12.0 13.2 P
8/23/2020 48 44.9 53.0 62.4 45.8 48.5 52.6 -0.81 -0.78 -0.73 -1.21 9.6 10.3 11.4 P
8/24/2020 48 43.5 50.3 56.1 46.0 47.2 48.2 -0.86 -0.84 -0.81 -1.21 8.6 9.1 9.7P
8/25/2020 48 46.5 50.1 55.0 46.0 46.8 47.6 -0.90 -0.87 -0.84 -1.21 7.6 8.3 9.0P
8/26/2020 48 43.6 48.7 54.3 45.3 46.6 48.9 -0.92 -0.88 -0.82 -1.21 7.2 8.0 9.4P
8/27/2020 48 41.4 51.8 59.0 46.5 48.1 50.5 -0.96 -0.91 -0.86 -1.21 6.4 7.3 8.7P
8/28/2020 48 38.4 47.6 56.4 44.2 46.7 48.9 -0.97 -0.88 0.02 -1.21 6.0 8.0 26.5P
8/29/2020 48 48.3 53.2 59.9 47.4 48.9 50.6 -0.67 -0.46 0.27 -1.21 12.7 17.0 31.3 P
8/30/2020 48 46.4 52.4 60.2 46.4 48.4 50.5 -0.68 -0.38 0.17 -1.21 12.4 18.5 29.3 P
8/31/2020 48 41.3 49.2 62.4 44.6 46.6 49.4 -0.61 -0.54 -0.45 -1.21 13.9 15.3 17.2 P
9/1/2020 48 44.2 49.8 58.6 44.7 46.5 49.4 -0.66 -0.58 -0.49 -1.21 12.9 14.4 16.4 P
9/2/2020 48 41.6 46.2 52.4 44.0 45.6 48.9 -0.68 -0.65 -0.59 -1.21 12.5 13.1 14.4 P
9/3/2020 48 38.6 46.9 55.2 43.6 45.6 48.3 -0.76 -0.71 -0.66 -1.21 10.7 11.9 12.9 P
9/4/2020 48 36.7 45.8 54.7 42.0 44.8 48.5 -0.80 -0.77 -0.74 -1.21 9.8 10.5 11.1 P
9/5/2020 48 41.8 45.5 48.9 43.6 44.4 44.9 -0.83 -0.78 -0.70 -1.21 9.1 10.4 11.9 P
9/6/2020 48 46.9 49.9 54.0 44.9 46.9 48.5 -0.79 -0.55 -0.17 -1.21 10.2 15.0 22.8 P
9/7/2020 48 45.8 50.5 60.9 44.9 46.9 50.3 -0.60 -0.48 -0.19 -1.21 14.2 16.6 22.3 P
9/8/2020 48 37.3 47.1 53.1 43.1 45.0 46.0 -0.70 -0.64 -0.56 -1.21 12.1 13.3 14.8 P
9/9/2020 48 35.0 45.3 55.0 41.4 44.0 48.0 -0.76 -0.72 -0.68 -1.21 10.8 11.6 12.5 P
9/10/2020 48 35.2 46.0 53.4 42.9 44.8 49.1 -0.81 -0.77 -0.74 -1.21 9.5 10.4 11.2 P
9/11/2020 48 30.8 41.7 54.7 40.9 44.0 48.5 -0.85 -0.82 -0.79 -1.21 8.7 9.3 10.2 P
9/12/2020 48 33.6 46.4 57.3 42.4 45.0 48.2 -0.89 -0.87 -0.84 -1.21 7.9 8.4 9.0P
9/13/2020 48 48.9 52.1 54.5 46.4 48.3 49.9 -0.85 -0.77 -0.61 -1.21 8.7 10.5 13.9 P
9/14/2020 48 46.7 50.9 53.8 46.2 48.3 49.1 -0.75 -0.22 0.19 -1.21 11.0 21.6 29.8 P
9/15/2020 48 35.6 45.3 53.8 42.4 44.9 46.9 -0.56 -0.49 -0.38 -1.21 14.8 16.4 18.6 P
9/16/2020 48 42.4 45.9 49.1 43.5 45.2 46.0 -0.56 -0.15 0.21 -1.21 14.9 23.1 30.1 P
9/17/2020 48 42.5 45.6 49.8 43.5 44.2 45.3 0.08 0.34 0.64 -1.21 27.7 32.6 38.2P
9/18/2020 48 35.8 44.2 50.8 41.6 43.5 44.7 -0.30 -0.14 0.06 -1.21 20.2 23.3 27.3 P
9/19/2020 48 43.5 47.0 53.4 42.9 44.1 46.0 -0.50 -0.42 -0.31 -1.21 16.1 17.9 19.9 P
9/20/2020 48 43.8 48.8 56.1 43.5 45.7 48.9 -0.53 -0.24 0.20 -1.21 15.6 21.4 29.9 P
9/21/2020 48 44.2 47.3 50.6 44.7 45.4 46.4 -0.35 -0.11 0.45 -1.21 19.2 23.9 34.7 P
9/22/2020 48 42.9 45.4 48.5 42.7 44.1 44.7 0.01 0.17 0.32 -1.21 26.3 29.5 32.2P
9/23/2020 48 41.6 44.1 48.7 42.2 42.8 43.6 -0.31 -0.16 0.00 -1.21 20.0 23.0 26.2 P
9/24/2020 48 39.6 42.7 48.7 41.3 42.6 45.1 -0.48 -0.40 -0.29 -1.21 16.5 18.3 20.4 P
9/25/2020 48 38.6 42.0 47.1 41.4 42.2 43.6 -0.56 -0.52 -0.48 -1.21 15.0 15.8 16.6 P
9/26/2020 48 35.6 39.2 45.8 40.1 41.4 43.6 -0.65 -0.61 -0.56 -1.21 13.1 14.0 15.0 P
9/27/2020 48 35.6 38.7 42.7 39.2 40.1 41.6 -0.69 -0.65 -0.60 -1.21 12.3 13.0 14.2 P
9/28/2020 48 39.2 42.7 47.3 40.7 42.0 43.6 -0.66 -0.57 -0.46 -1.21 12.9 14.7 17.0 P
9/29/2020 48 42.2 44.7 49.6 42.0 42.9 44.4 -0.59 -0.54 -0.49 -1.21 14.3 15.4 16.3 P
9/30/2020 48 40.1 43.0 45.1 40.9 42.4 42.9 -0.57 -0.43 -0.30 -1.21 14.8 17.6 20.3 P
10/1/2020 48 40.7 43.8 48.0 42.0 43.1 45.3 -0.47 -0.41 -0.37 -1.21 16.9 17.9 18.8 P
10/2/2020 48 39.4 41.5 43.8 40.7 41.6 42.4 -0.49 -0.47 -0.43 -1.21 16.3 16.8 17.5 P
10/3/2020 48 31.4 40.9 49.6 39.4 41.6 43.5 -0.58 -0.54 -0.48 -1.21 14.5 15.4 16.6 P
10/4/2020 48 33.2 40.9 49.9 39.6 41.6 43.8 -0.67 -0.63 -0.58 -1.21 12.6 13.6 14.4 P
10/5/2020 12 41.6 42.7 43.5 42.0 42.2 42.2 -0.67 -0.64 -0.61 -1.21 12.6 13.2 13.9 P
12/3/2021
Daily, _SfkHydrology.xlsx
Page 14 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
SOUTH FORK GAUGING STATION 12/3/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, RP2=0 Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
GAP IN RECORD DUE TO FULL MEMORY (Note 6)
3/10/2021 ADDITIONAL DATA NOT DOWNLOADED YET.
NOTES:
1 Record count is the number of individual readings collected daily by logging equipment. Equipment is configured for 15 (before 3/15/2017) or 30-minute (after 8/23/2017) logging interval.
2 From 8/16/2016 to 3/15/2017, air temperature data not logged by this station hardware Manufacturer's reported temperature accuracy is +/- 0.44 degrees Celcius.
3 'SD Offset' represents shifts made to the stage-discharge curve to reflect changing site conditions over time. It corresponds to the vertical distance from RP2 down to the
point of zero flow in the creek at the station cross section.
4 Calculated flow greater than 40 cfs is more than double the highest flow measurement at this station and is indicated by a lighter italic font.
Such flows are calculated from an extrapolated station rating curve and are less certain than lower flows (see hydrology memo narrative).
5 Stage record from 10/28/2016 to 11/21/2016 indicates a hardware problem or creek bed instability. Calculated flow is expected to be significantly inaccurate and is not reported.
6 Data for 3/15/2017 to 8/23/2017 and 9/11/2018 to 11/21/2018 not collected due to equipment failure. Data from 10/5/2020 to 3/10/2021 not collected due to full logger memory.
7 Station established August 17, 2016. Data are reported through most recent download March 10, 2021.
ABBREVIATIONS:
cfs: cubic feet per second.
F Fahrenheit
ft: feet
OSS: Outside staff.
data status: A Flow calculated from accepted final analysis of available site data.Values 8/16/2016 to 7/11/2019 are accepted and final.
A:e Estimated flow calculated from accepted final analysis of available site data. Values after 7/11/2019 are provisional.
P Flow calculated from provisional final analysis of available site data.
P:e Estimated flow calculated from provisional analysis of available site data.
All provisional flows are subject to adjustment and revision.
Estimates typically necessary due to transient sensor error, ice affected stage record, or water level below sensor elevation.
12/3/2021
Daily, _SfkHydrology.xlsx
Page 15 of 15
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
8/16/2016 29 - - - 51.4 51.8 51.9 0.42 0.55 0.64 -0.58 6.8 9.2 11.1 A
8/17/2016 97 - - - 50.1 52.1 59.9 -0.69 0.45 1.34 -0.58 6.1 7.7 34 A
8/18/2016 96 - - - 50.3 52.8 57.0 0.31 0.35 0.39 -0.58 5.1 5.6 6.3 A
8/19/2016 96 - - - 50.5 52.2 55.2 0.30 0.37 0.60 -0.58 4.9 6.0 10.2 A
8/20/2016 96 - - - 49.4 52.0 55.7 0.29 0.32 0.36 -0.58 4.8 5.2 5.8 A
8/21/2016 96 - - - 50.7 52.8 56.6 0.27 0.29 0.32 -0.58 4.5 4.8 5.2 A
8/22/2016 96 - - - 50.3 51.5 52.8 0.27 0.28 0.30 -0.58 4.5 4.7 4.9 A
8/23/2016 96 - - - 50.1 51.0 51.9 0.26 0.30 0.38 -0.58 4.3 4.9 6.1 A
8/24/2016 96 - - - 49.1 52.0 55.2 0.25 0.28 0.33 -0.58 4.2 4.6 5.3 A
8/25/2016 96 - - - 49.8 52.3 55.2 0.21 0.23 0.25 -0.58 3.7 4.0 4.3 A
8/26/2016 96 - - - 50.1 53.4 58.3 0.19 0.20 0.22 -0.58 3.5 3.7 3.9 A
8/27/2016 96 - - - 50.8 54.0 58.7 0.17 0.18 0.20 -0.58 3.3 3.4 3.6 A
8/28/2016 96 - - - 53.0 56.2 62.8 0.13 0.16 0.17 -0.58 2.9 3.1 3.3 A
8/29/2016 96 - - - 51.6 55.6 62.0 0.11 0.13 0.14 -0.58 2.6 2.8 3.0 A
8/30/2016 96 - - - 49.8 53.4 57.5 0.11 0.12 0.13 -0.58 2.7 2.8 2.9 A
8/31/2016 96 - - - 52.6 53.0 53.7 0.11 0.22 0.61 -0.58 2.7 4.3 10.5 A
9/1/2016 96 - - - 52.8 53.4 54.2 0.35 0.47 0.62 -0.58 5.7 7.8 10.6 A
9/2/2016 96 - - - 53.3 54.1 55.6 0.38 0.46 0.78 -0.58 6.1 7.5 14.5 A
9/3/2016 96 - - - 50.0 52.9 56.4 0.41 0.53 0.80 -0.58 6.6 9.0 15.1 A
9/4/2016 96 - - - 51.2 52.3 55.0 0.40 0.46 0.56 -0.58 6.4 7.5 9.4 A
9/5/2016 96 - - - 48.4 51.0 54.2 0.34 0.39 0.44 -0.58 5.5 6.2 7.1 A
9/6/2016 96 - - - 48.7 50.5 53.3 0.30 0.33 0.35 -0.58 4.9 5.3 5.6 A
9/7/2016 96 - - - 48.4 49.7 52.1 0.27 0.30 0.33 -0.58 4.6 4.8 5.4 A
9/8/2016 96 - - - 46.0 49.3 54.7 0.24 0.26 0.29 -0.58 4.1 4.4 4.7 A
9/9/2016 96 - - - 46.6 48.8 51.9 0.21 0.23 0.25 -0.58 3.8 4.0 4.2 A
9/10/2016 96 - - - 48.4 50.1 52.8 0.21 0.74 1.61 -0.58 3.8 16.8 48 A
9/11/2016 96 - - - 47.1 48.9 51.9 0.75 1.02 1.39 -0.58 13.8 22 37 A
9/12/2016 96 - - - 47.3 48.8 50.3 0.66 0.79 0.97 -0.58 11.5 15.0 20 A
9/13/2016 96 - - - 46.8 47.8 49.4 0.57 0.68 1.04 -0.58 9.6 12.1 23 A
9/14/2016 96 - - - 47.3 48.4 50.0 0.71 0.77 0.90 -0.58 12.8 14.4 18 A
9/15/2016 96 - - - 46.8 48.3 50.3 0.60 0.67 0.77 -0.58 10.2 11.9 14.4 A
9/16/2016 96 - - - 44.0 47.3 48.5 0.59 0.66 0.80 -0.58 9.9 11.6 15.2 A
9/17/2016 96 - - - 42.9 44.2 45.7 0.56 0.61 0.75 -0.58 9.4 10.4 13.7 A
9/18/2016 96 - - - 43.9 45.9 48.7 0.47 0.52 0.58 -0.58 7.7 8.6 9.8 A
9/19/2016 96 - - - 45.3 46.7 49.4 0.45 0.81 1.47 -0.58 7.2 17 40 A
9/20/2016 96 - - - 43.1 45.5 50.3 0.65 0.77 1.00 -0.58 11.3 14.5 21 A
9/21/2016 96 - - - 42.0 44.0 47.1 0.52 0.58 0.65 -0.58 8.6 9.7 11.3 A
9/22/2016 96 - - - 43.3 44.6 47.8 0.44 0.48 0.52 -0.58 7.1 7.8 8.6 A
9/23/2016 96 - - - 42.9 44.0 46.0 0.39 0.42 0.49 -0.58 6.2 6.7 7.9 A
9/24/2016 96 - - - 43.7 45.0 47.5 0.35 0.38 0.41 -0.58 5.7 6.1 6.6 A
9/25/2016 96 - - - 42.6 44.2 46.4 0.30 0.33 0.36 -0.58 4.9 5.3 5.7 A
9/26/2016 96 - - - 44.0 44.8 46.2 0.30 0.35 0.40 -0.58 4.9 5.6 6.5 A
9/27/2016 96 - - - 44.2 45.2 46.4 0.28 0.30 0.33 -0.58 4.6 4.9 5.4 A
9/28/2016 96 - - - 43.9 45.5 48.7 0.24 0.26 0.28 -0.58 4.1 4.4 4.7 A
9/29/2016 96 - - - 44.9 46.3 48.0 0.23 0.36 1.32 -0.58 3.9 7.0 34 A
9/30/2016 96 - - - 46.8 48.8 51.2 0.94 1.25 1.91 -0.58 19 32 66 A
10/1/2016 96 - - - 43.1 45.4 46.9 0.84 1.02 1.27 -0.58 16.1 22 31 A
10/2/2016 96 - - - 44.2 45.7 48.9 0.63 0.72 0.86 -0.58 10.9 13.0 16.8 A
10/3/2016 96 - - - 42.6 44.2 46.0 0.54 0.59 0.65 -0.58 9.0 9.9 11.3 A
10/4/2016 96 - - - 44.4 44.6 44.9 0.49 0.53 0.56 -0.58 8.1 8.7 9.3 A
10/5/2016 96 - - - 44.2 44.8 45.9 0.44 0.48 0.58 -0.58 7.1 7.9 9.7 A
10/6/2016 96 - - - 45.5 46.4 48.0 0.53 0.59 0.68 -0.58 8.8 9.9 12.1 A
10/7/2016 96 - - - 46.0 48.0 49.4 0.58 0.84 1.25 -0.58 9.9 16.6 31 A
10/8/2016 96 - - - 43.9 46.6 48.4 0.88 1.17 1.56 -0.58 17 28 45 A
10/9/2016 96 - - - 42.9 44.7 46.4 0.66 0.76 0.89 -0.58 11.5 14.0 18 A
10/10/2016 96 - - - 44.4 46.1 47.8 0.64 0.80 1.13 -0.58 11.1 15.2 26 A
10/11/2016 96 - - - 45.9 46.6 47.7 0.66 0.75 0.85 -0.58 11.5 13.8 16.4 A
10/12/2016 96 - - - 45.1 46.6 49.6 0.61 0.67 0.78 -0.58 10.5 11.8 14.5 A
10/13/2016 96 - - - 44.6 46.1 48.0 0.54 0.59 0.66 -0.58 8.9 10.0 11.6 A
10/14/2016 96 - - - 42.9 44.4 46.0 0.51 0.54 0.57 -0.58 8.3 8.9 9.6 A
10/15/2016 96 - - - 43.3 44.3 46.9 0.55 0.60 0.69 -0.58 9.2 10.3 12.3 A
10/16/2016 96 - - - 40.5 43.0 45.1 0.52 0.58 0.66 -0.58 8.5 9.8 11.6 A
10/17/2016 96 - - - 36.4 38.4 40.3 0.47 0.50 0.53 -0.58 7.7 8.2 8.8 A
10/18/2016 96 - - - 34.2 35.5 36.7 0.42 0.46 0.49 -0.58 6.7 7.5 7.9 A
10/19/2016 96 - - - 34.4 38.7 41.1 0.45 0.76 1.06 -0.58 7.3 14.2 23 A
10/20/2016 96 - - - 39.0 40.2 42.2 0.52 0.57 0.64 -0.58 8.5 9.6 11.2 A
10/21/2016 96 - - - 37.7 39.2 41.8 0.46 0.49 0.53 -0.58 7.5 8.0 8.7 A
10/22/2016 96 - - - 36.6 38.6 41.1 0.40 0.43 0.47 -0.58 6.4 7.0 7.7 A
10/23/2016 96 - - - 37.9 41.1 43.5 0.38 0.50 0.74 -0.58 6.1 8.4 13.4 A
10/24/2016 96 - - - 40.9 42.2 44.2 0.42 0.47 0.56 -0.58 6.8 7.7 9.3 A
10/25/2016 96 - - - 40.3 42.9 45.1 0.41 0.63 1.06 -0.58 6.6 11.3 23 A
10/26/2016 96 - - - 40.0 41.1 43.1 0.48 0.53 0.59 -0.58 7.9 8.7 10.1 A
10/27/2016 96 - - - 37.9 40.7 44.0 0.43 0.47 0.55 -0.58 6.9 7.7 9.2 A
10/28/2016 96 - - - 40.5 44.2 46.4 0.28 0.82 3.22 -1.06 7.3 43 190 A
10/29/2016 96 - - - 39.8 40.7 42.4 -0.24 -0.06 0.28 -1.60 14.7 20 33 A
10/30/2016 96 - - - 39.0 40.5 41.5 -0.28 -0.05 0.11 -1.60 13.4 20 26 A
10/31/2016 96 - - - 38.7 40.0 41.8 -0.35 -0.26 -0.11 -1.60 11.8 14.2 18 A
11/1/2016 96 - - - 38.1 39.4 40.2 -0.41 -0.35 -0.24 -1.60 10.3 11.9 14.6 A
11/2/2016 96 - - - 36.6 37.7 39.4 -0.54 -0.48 -0.39 -1.60 7.9 8.9 10.8 A
11/3/2016 96 - - - 36.4 37.7 38.7 -0.60 -0.56 -0.50 -1.60 6.7 7.5 8.5 A
11/4/2016 96 - - - 37.5 38.8 40.3 -0.67 -0.63 -0.60 -1.60 5.7 6.2 6.8 A:e
11/5/2016 96 - - - 41.1 41.6 42.2 -0.71 -0.69 -0.68 -1.60 5.1 5.3 5.5 A:e
11/6/2016 100 - - - 40.7 41.9 42.6 -0.78 -0.71 -0.68 -1.60 4.2 5.1 5.5 A
11/7/2016 96 - - - 39.2 42.4 42.9 -0.76 -0.73 -0.55 -1.60 4.4 4.8 7.7 A
11/8/2016 96 - - - 37.3 37.8 38.7 -0.52 -0.30 -0.14 -1.60 8.1 13.2 17 A
11/9/2016 96 - - - 38.7 39.5 40.3 -0.50 -0.44 -0.38 -1.60 8.7 9.9 11.1 A
11/10/2016 96 - - - 35.8 37.4 39.6 -0.54 -0.49 -0.43 -1.60 7.7 8.8 10.0 A
11/11/2016 96 - - - 37.9 39.4 40.7 -0.65 -0.61 -0.54 -1.60 5.9 6.6 7.8 A
11/12/2016 96 - - - 36.9 38.9 40.2 -0.70 -0.53 -0.26 -1.60 5.2 8.3 14.1 A
11/13/2016 96 - - - 38.3 40.0 41.1 -0.55 -0.47 -0.36 -1.60 7.6 9.2 11.6 A
11/14/2016 96 - - - 34.6 36.2 38.3 -0.64 -0.56 -0.41 -1.60 6.1 7.4 10.5 A
12/10/2021
Daily, _NfkHydrology.xlsx
Page 1 of 11
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
11/15/2016 96 --- 37.1 39.1 39.8 -0.71 -0.68 -0.64 -1.60 5.0 5.5 6.2 A:e
11/16/2016 96 --- 39.6 40.0 40.3 -0.76 -0.74 -0.71 -1.60 4.3 4.6 5.0 A:e
11/17/2016 96 --- 39.8 40.8 41.5 -0.79 -0.78 -0.75 -1.60 4.0 4.2 4.5 A:e
11/18/2016 96 --- 39.4 40.2 41.1 -0.76 -0.71 -0.65 -1.60 4.3 5.1 5.9 A
11/19/2016 96 --- 40.3 40.6 41.1 -0.78 -0.76 -0.75 -1.60 4.2 4.3 4.5 A
11/20/2016 96 --- 39.6 40.4 41.1 -0.80 -0.77 -0.72 -1.60 3.8 4.2 4.9 A
11/21/2016 96 --- 40.2 40.6 41.3 -0.84 -0.81 -0.79 -1.60 3.4 3.7 4.0 A
11/22/2016 96 --- 36.0 38.1 40.9 -0.83 -0.70 -0.46 -1.60 3.5 5.2 9.4 A
11/23/2016 96 --- 39.2 40.4 41.5 -0.82 -0.80 -0.78 -1.60 3.7 3.8 4.1 A
11/24/2016 96 --- 40.0 40.7 41.8 -0.85 -0.80 -0.72 -1.60 3.3 3.9 4.9 A
11/25/2016 96 --- 40.0 40.7 41.6 -0.84 -0.81 -0.72 -1.60 3.4 3.8 4.9 A
11/26/2016 96 --- 34.6 36.6 40.0 -0.69 -0.29 -0.06 -1.60 5.3 13.3 20 A
11/27/2016 96 --- 34.6 37.0 38.7 -0.66 -0.59 -0.46 -1.60 5.7 7.0 9.3 A
11/28/2016 96 --- 38.1 38.9 39.8 -0.74 -0.70 -0.66 -1.60 4.7 5.2 5.9 A
11/29/2016 96 --- 38.3 39.3 40.2 -0.77 -0.74 -0.72 -1.60 4.3 4.6 4.9 A
11/30/2016 96 --- 36.9 39.0 40.3 -0.75 -0.72 -0.66 -1.60 4.5 4.9 5.8 A
12/1/2016 96 --- 37.5 37.6 37.7 -0.77 -0.75 -0.74 -1.60 4.3 4.4 4.6 A:e
12/2/2016 96 --- 36.2 39.1 40.7 -0.85 -0.82 -0.81 -1.60 3.3 3.6 3.8 A:e
12/3/2016 96 --- 37.5 39.8 40.7 -0.86 -0.85 -0.84 -1.60 3.2 3.3 3.5 A:e
12/4/2016 96 --- 35.2 39.6 40.5 -0.87 -0.81 -0.47 -1.60 3.1 3.9 9.1 A
12/5/2016 96 --- 33.4 35.8 37.5 -0.75 -0.60 -0.35 -1.60 4.5 7.0 11.8 A
12/6/2016 96 --- 36.4 37.3 37.9 -0.82 -0.79 -0.74 -1.60 3.6 4.1 4.6 A:e
12/7/2016 96 --- 36.2 36.3 36.4 -0.85 -0.84 -0.81 -1.60 3.3 3.4 3.7 A:e
12/8/2016 96 --- 37.1 37.5 37.7 -0.88 -0.87 -0.86 -1.60 3.0 3.1 3.1 A:e
12/9/2016 96 --- 37.7 38.0 38.1 -0.90 -0.90 -0.88 -1.60 2.7 2.8 2.9 A:e
12/10/2016 96 --- 35.6 37.5 38.1 -0.93 -0.91 -0.89 -1.60 2.4 2.6 2.8 A:e
12/11/2016 96 --- 36.9 38.7 39.4 -0.94 -0.93 -0.93 -1.60 2.4 2.5 2.5 A:e
12/12/2016 96 --- 32.2 35.3 39.0 -0.94 -0.56 -0.14 -1.60 2.4 8.2 17 A
12/13/2016 96 --- 33.8 34.7 36.0 -0.56 -0.13 0.35 -1.60 7.4 19 36 A
12/14/2016 96 --- 34.0 35.1 36.2 -0.29 -0.02 0.52 -1.60 13.3 22 44 A
12/15/2016 96 --- 32.8 35.2 36.0 -0.40 -0.29 0.19 -1.60 10.6 13.4 29 A
12/16/2016 96 --- 34.2 34.8 35.4 -0.39 -0.21 0.18 -1.60 10.9 15.6 28 A
12/17/2016 96 --- 33.2 34.1 35.2 -0.49 -0.44 -0.38 -1.60 8.8 9.8 11.1 A:e
12/18/2016 96 --- 34.2 35.0 36.0 -0.57 -0.51 -0.41 -1.60 7.2 8.3 10.4 A
12/19/2016 96 --- 35.0 35.7 36.7 -0.64 -0.60 -0.56 -1.60 6.1 6.7 7.5 A
12/20/2016 96 --- 33.0 34.5 35.8 -0.73 -0.68 -0.63 -1.60 4.8 5.5 6.2 A
12/21/2016 96 --- 33.0 33.9 35.4 -0.74 -0.72 -0.69 -1.60 4.6 4.9 5.3 A
12/22/2016 96 --- 33.2 33.8 35.0 -0.79 -0.76 -0.73 -1.60 4.0 4.4 4.7 A
12/23/2016 96 --- 33.0 34.5 35.4 -0.79 -0.72 -0.45 -1.60 3.9 5.0 9.6 A
12/24/2016 96 --- 33.0 34.6 35.6 -0.44 -0.33 -0.16 -1.60 9.8 12.4 16.8 A
12/25/2016 96 --- 33.8 34.5 35.8 -0.67 -0.57 -0.41 -1.60 5.7 7.4 10.5 A
12/26/2016 96 --- 32.6 33.7 34.6 -0.73 -0.70 -0.65 -1.60 4.8 5.2 5.9 A
12/27/2016 96 --- 32.6 34.2 35.0 -0.78 -0.73 -0.69 -1.60 4.2 4.8 5.3 A
12/28/2016 96 --- 33.0 34.0 35.2 -0.80 -0.77 -0.75 -1.60 3.9 4.3 4.6 A
12/29/2016 96 --- 34.0 35.7 37.3 -0.81 -0.62 -0.35 -1.60 3.8 6.8 11.9 A
12/30/2016 96 --- 33.6 34.3 35.4 -0.77 -0.68 -0.54 -1.60 4.3 5.5 7.8 A
12/31/2016 96 --- 35.0 35.5 36.4 -0.74 -0.24 0.12 -1.60 4.6 16.2 26 A
1/1/2017 96 --- 35.2 35.8 36.2 -0.09 0.06 0.25 -1.60 19 24 32 A
1/2/2017 96 --- 36.0 36.3 36.6 0.10 0.16 0.21 -1.60 25 28 30 A
1/3/2017 96 --- 36.2 36.8 36.9 -0.03 0.08 0.15 -1.60 21 25 27 A
1/4/2017 96 --- 35.2 36.4 37.3 -0.23 -0.14 -0.02 -1.60 14.8 17 21 A
1/5/2017 96 --- 34.4 35.1 36.2 -0.39 -0.31 -0.22 -1.60 10.9 12.9 15.1 A
1/6/2017 96 --- 33.0 34.0 35.2 -0.47 -0.43 -0.38 -1.60 9.2 10.0 11.2 A:e
1/7/2017 96 --- 33.8 34.5 35.0 -0.56 -0.54 -0.53 -1.60 7.5 7.8 8.0 A:e
1/8/2017 96 --- 33.0 34.3 35.2 -0.65 -0.62 -0.59 -1.60 6.0 6.5 6.9 A:e
1/9/2017 96 --- 32.6 33.2 34.2 -0.69 -0.67 -0.64 -1.60 5.3 5.6 6.1 A:e
1/10/2017 96 --- 32.4 33.6 34.0 -0.75 -0.73 -0.71 -1.60 4.5 4.8 5.0 A:e
1/11/2017 96 --- 33.0 33.6 34.6 -0.77 -0.76 -0.74 -1.60 4.2 4.4 4.6 A:e
1/12/2017 96 --- 32.6 32.8 33.2 -0.81 -0.79 -0.78 -1.60 3.8 4.0 4.1 A:e
1/13/2017 96 --- 32.2 32.5 33.0 -0.89 -0.83 -0.80 -1.60 2.9 3.5 3.9 A:e
1/14/2017 96 --- 32.0 32.2 32.4 -0.88 -0.87 -0.86 -1.60 3.0 3.1 3.1 A:e
1/15/2017 96 --- 32.4 32.7 32.8 -0.90 -0.90 -0.89 -1.60 2.7 2.8 2.9 A:e
1/16/2017 96 --- 33.0 33.4 33.6 -0.91 -0.90 -0.89 -1.60 2.6 2.7 2.9 A:e
1/17/2017 96 --- 33.0 33.1 33.2 -0.91 -0.90 -0.88 -1.60 2.6 2.7 2.9 A:e
1/18/2017 96 --- 32.0 33.2 33.6 -0.94 -0.93 -0.92 -1.60 2.3 2.5 2.6 A:e
1/19/2017 96 --- 33.0 33.7 34.2 -0.97 -0.95 -0.93 -1.60 2.2 2.3 2.5 A:e
1/20/2017 96 ----------1.60---A:e
1/21/2017 96 --- 32.2 32.9 33.2 -0.99 -0.99 -0.98 -1.60 1.9 2.0 2.1 A:e
1/22/2017 96 --- 31.0 31.9 32.8 -1.02 -0.99 -0.95 -1.60 1.8 2.0 2.3 A:e
1/23/2017 96 --- 32.4 32.7 33.6 -0.97 -0.84 -0.74 -1.60 2.1 3.4 4.6 A
1/24/2017 96 --- 33.6 34.5 35.4 -0.93 -0.89 -0.83 -1.60 2.5 2.9 3.6 A
1/25/2017 96 --- 32.0 33.8 34.6 -1.09 -0.95 -0.92 -1.60 2.3 2.4 2.6 A:e
1/26/2017 96 --- 31.0 31.8 32.2 -1.03 -0.95 -0.90 -1.60 2.1 2.2 2.4 A:e
1/27/2017 96 --- 30.6 31.7 31.8 -0.99 -0.98 -0.97 -1.60 2.0 2.1 2.1 A:e
1/28/2017 96 --- 30.2 32.2 33.2 -1.01 -0.99 -0.98 -1.60 1.8 2.0 2.1 A:e
1/29/2017 96 --- 29.6 33.1 34.8 -1.01 -0.95 -0.58 -1.60 1.8 2.4 7.1 A:e
1/30/2017 96 --- 31.8 32.7 33.8 -0.79 -0.58 -0.32 -1.60 3.9 7.3 12.5 A:e
1/31/2017 96 --- 33.4 34.1 35.6 -0.90 -0.86 -0.78 -1.60 2.8 3.2 4.1 A:e
2/1/2017 96 --- 32.4 34.1 35.6 -0.96 -0.93 -0.91 -1.60 2.3 2.4 2.7 A:e
2/2/2017 96 --- 34.0 34.5 35.0 -0.97 -0.95 -0.93 -1.60 2.1 2.3 2.5 A
2/3/2017 96 --- 34.0 34.6 34.8 -0.93 -0.89 -0.86 -1.60 2.4 2.9 3.2 A
2/4/2017 96 --- 34.0 34.3 34.8 -0.94 -0.92 -0.90 -1.60 2.4 2.6 2.8 A
2/5/2017 96 --- 33.2 34.3 36.2 -0.97 -0.95 -0.93 -1.60 2.2 2.3 2.4 A
2/6/2017 96 --- 31.0 33.8 41.1 -0.98 -0.96 -0.94 -1.60 2.0 2.2 2.4 A:e
2/7/2017 96 --- 32.6 34.1 36.2 -0.99 -0.98 -0.96 -1.60 2.0 2.1 2.2 A
2/8/2017 96 --- 32.6 34.9 40.0 -1.00 -0.99 -0.97 -1.60 1.9 2.0 2.1 A
2/9/2017 96 --- 30.6 31.5 32.4 -1.00 -0.99 -0.99 -1.60 1.9 1.9 2.0 A:e
2/10/2017 96 ----------1.60---A:e
2/11/2017 96 --- 29.0 30.0 30.6 -1.04 -1.03 -1.03 -1.60 1.6 1.6 1.7 A:e
2/12/2017 96 ----------1.60---A:e
2/13/2017 96 --- 30.8 31.9 33.6 -1.02 -1.01 -1.00 -1.60 1.7 1.8 1.9 A:e
12/10/2021
Daily, _NfkHydrology.xlsx
Page 2 of 11
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
2/14/2017 96 --- 29.8 34.0 40.0 -1.06 -1.05 -1.03 -1.60 1.5 1.5 1.7 A:e
2/15/2017 96 --- 31.2 33.1 38.8 -1.06 -1.05 -1.04 -1.60 1.4 1.5 1.6 A:e
2/16/2017 96 --- 31.0 32.9 34.8 -1.07 -1.06 -1.06 -1.60 1.4 1.4 1.5 A:e
2/17/2017 96 --- 29.0 35.5 40.0 -1.09 -1.07 -1.05 -1.60 1.3 1.4 1.5 A:e
2/18/2017 96 --- 31.4 32.0 32.4 -1.08 -1.07 -1.07 -1.60 1.3 1.4 1.4 A:e
2/19/2017 96 --- 30.2 30.7 31.2 -1.08 -1.08 -1.08 -1.60 1.3 1.3 1.3 A:e
2/20/2017 96 --- 28.4 31.8 34.4 -1.10 -1.08 -1.03 -1.60 1.2 1.3 1.7 A:e
2/21/2017 96 --- 31.8 32.3 33.8 -1.09 -0.86 -0.66 -1.60 1.3 3.4 5.8 A:e
2/22/2017 96 --- 32.0 33.6 35.0 -0.93 -0.79 -0.58 -1.60 2.4 4.1 7.1 A
2/23/2017 96 --- 31.8 32.7 34.0 -0.75 -0.25 0.21 -1.60 4.5 15.6 30 A
2/24/2017 96 --- 32.8 34.8 36.7 -0.70 -0.63 -0.45 -1.60 4.8 6.3 9.5 A:e
2/25/2017 96 --- 33.4 35.9 36.9 -0.83 -0.81 -0.78 -1.60 3.5 4.1 4.8 A:e
2/26/2017 96 --- 34.6 36.7 37.9 -0.89 -0.88 -0.86 -1.60 2.8 3.2 3.5 A:e
2/27/2017 96 --- 34.8 36.3 39.8 -0.91 -0.90 -0.88 -1.60 2.4 2.6 2.8 A:e
2/28/2017 96 ----------1.602.12.22.4A:e
3/1/2017 96 --- 33.0 34.2 35.0 -0.96 -0.94 -0.93 -1.60 2.0 2.1 2.1 A:e
3/2/2017 96 ----------1.602.02.02.0A:e
3/3/2017 96 --- 32.8 37.7 43.5 -1.03 -0.99 -0.97 -1.60 1.9 1.9 2.0 A:e
3/4/2017 96 --- 32.2 36.3 39.0 -1.03 -1.02 -1.01 -1.60 1.8 1.9 1.9 A:e
3/5/2017 96 --- 33.4 36.0 39.0 -1.03 -1.02 -1.01 -1.60 1.8 1.8 1.8 A:e
3/6/2017 96 --- 32.6 37.2 43.7 -1.04 -1.02 -1.00 -1.60 1.7 1.8 1.8 A:e
3/7/2017 96 --- 30.4 39.7 48.7 -1.07 -1.02 -0.98 -1.60 1.7 1.7 1.7 A:e
3/8/2017 97 --- 32.8 39.0 44.2 -1.09 -1.02 -0.97 -1.60 1.6 1.7 1.7 A:e
3/9/2017 96 --- 33.2 37.9 42.4 -1.08 -1.02 -0.95 -1.60 1.6 1.6 1.6 A:e
3/10/2017 96 --- 30.6 37.6 43.7 -1.10 -1.03 -0.95 -1.60 1.6 1.6 1.6 A:e
3/11/2017 96 --- 32.8 39.6 46.9 -1.07 -1.04 -1.01 -1.60 1.5 1.6 1.6 A:e
3/12/2017 92 --- 32.6 36.7 40.9 -1.07 -1.04 -1.00 -1.60 1.5 1.5 1.5 A:e
3/13/2017 96 --- 33.4 39.4 44.9 -1.07 -1.05 -1.03 -1.60 1.5 1.5 1.5 A:e
3/14/2017 96 --- 33.6 39.3 45.3 -1.09 -1.06 -1.03 -1.60 1.5 1.5 1.5 A:e
3/15/2017 96 --- 33.0 36.3 39.4 -1.09 -1.06 -1.04 -1.60 1.4 1.5 1.5 A:e
3/16/2017 96 --- 30.2 35.1 41.5 -1.09 -1.05 -1.00 -1.60 1.4 1.4 1.4 A:e
3/17/2017 96 --- 29.2 37.0 44.8 -1.11 -1.05 -0.97 -1.60 1.4 1.4 1.4 A:e
3/18/2017 96 --- 32.2 36.5 43.9 -1.09 -1.08 -1.06 -1.60 1.4 1.4 1.4 A:e
3/19/2017 96 --- 31.4 38.5 46.6 -1.10 -1.06 -1.03 -1.60 1.4 1.4 1.4 A:e
3/20/2017 96 --- 31.8 37.8 44.8 -1.09 -1.04 -0.97 -1.60 1.3 1.3 1.4 A:e
3/21/2017 96 --- 32.2 37.4 44.8 -1.09 -1.05 -1.00 -1.60 1.3 1.3 1.3 A:e
3/22/2017 96 --- 30.2 38.0 44.0 -1.10 -1.04 -0.96 -1.60 1.3 1.3 1.3 A:e
3/23/2017 96 --- 32.6 38.4 45.7 -1.09 -1.04 -0.96 -1.60 1.3 1.3 1.3 A:e
3/24/2017 96 --- 25.6 33.0 36.7 -1.10 -1.04 -0.89 -1.60 1.3 1.3 1.3 A:e
3/25/2017 96 --- 30.8 35.2 37.5 -1.11 -1.10 -1.07 -1.60 1.3 1.3 1.3 A:e
3/26/2017 96 --- 31.4 33.3 35.6 -1.11 -1.10 -1.10 -1.60 1.2 1.3 1.3 A:e
3/27/2017 96 --- 28.8 35.7 49.8 -1.12 -1.08 -0.98 -1.60 1.2 1.2 1.2 A:e
3/28/2017 96 --- 28.0 33.8 47.7 -1.11 -1.08 -1.04 -1.60 1.2 1.2 1.2 A:e
3/29/2017 96 --- 24.6 32.4 44.9 -1.18 -1.08 -0.95 -1.60 1.2 1.2 1.2 A:e
3/30/2017 96 --- 30.6 32.6 34.0 -1.13 -1.10 -1.08 -1.60 1.2 1.2 1.2 A:e
3/31/2017 96 --- 30.4 31.3 33.0 -1.17 -1.10 -1.00 -1.60 1.2 1.2 1.2 A:e
4/1/2017 96 --- 30.8 33.1 34.4 -1.13 -1.12 -1.11 -1.60 1.2 1.2 1.2 A:e
4/2/2017 96 --- 26.9 39.7 51.2 -1.13 -1.10 -0.99 -1.60 1.2 1.2 1.2 A:e
4/3/2017 96 ----------1.601.21.21.2A:e
4/4/2017 96 --- 32.6 33.6 34.2 -1.11 -1.10 -1.09 -1.60 1.1 1.1 1.2 A:e
4/5/2017 96 --- 32.6 33.5 34.0 -1.12 -1.11 -1.09 -1.60 1.1 1.1 1.1 A:e
4/6/2017 96 --- 32.4 34.3 35.6 -1.12 -1.11 -1.10 -1.60 1.1 1.1 1.1 A:e
4/7/2017 96 --- 32.6 34.5 36.6 -1.12 -1.11 -1.11 -1.60 1.1 1.1 1.1 A:e
4/8/2017 96 --- 31.8 37.6 50.1 -1.13 -1.05 -0.92 -1.60 1.1 1.1 1.1 A:e
4/9/2017 96 --- 32.8 34.9 36.6 -1.11 -1.10 -1.09 -1.60 1.1 1.1 1.1 A:e
4/10/2017 96 --- 31.4 39.9 55.4 -1.13 -1.04 -0.92 -1.60 1.1 1.5 2.5 A:e
4/11/2017 96 --- 34.0 34.8 36.4 -1.02 -0.93 -0.81 -1.60 1.7 2.5 3.8 A:e
4/12/2017 96 --- 32.2 33.9 35.2 -0.88 -0.65 0.12 -1.60 3.0 7.3 26 A
4/13/2017 96 --- 32.2 33.8 36.2 -0.37 -0.14 0.22 -1.60 11.3 18 30 A
4/14/2017 96 --- 33.0 35.7 38.1 -0.63 -0.52 -0.38 -1.60 6.3 8.3 11.0 A:e
4/15/2017 96 --- 33.6 34.3 34.6 -0.63 -0.57 -0.50 -1.60 6.3 7.3 8.6 A:e
4/16/2017 96 --- 33.6 34.6 35.4 -0.65 -0.55 -0.47 -1.60 6.0 7.6 9.1 A:e
4/17/2017 96 --- 34.0 34.9 36.6 -0.54 -0.45 -0.37 -1.60 7.9 9.6 11.3 A
4/18/2017 96 --- 33.4 36.7 39.6 -0.64 -0.59 -0.45 -1.60 6.1 7.0 9.5 A:e
4/19/2017 96 --- 34.0 38.0 40.2 -0.73 -0.68 -0.60 -1.60 4.8 5.6 6.7 A:e
4/20/2017 96 --- 34.4 36.7 38.1 -0.78 -0.76 -0.75 -1.60 4.1 4.3 4.5 A:e
4/21/2017 96 --- 34.8 37.0 38.3 -0.82 -0.77 -0.68 -1.60 3.7 4.2 5.5 A:e
4/22/2017 96 --- 34.4 35.5 36.2 -0.68 -0.52 -0.24 -1.60 5.5 8.6 14.7 A
4/23/2017 96 --- 34.2 34.7 35.4 -0.41 -0.31 -0.21 -1.60 10.5 12.8 15.4 A
4/24/2017 96 --- 34.2 34.8 35.4 -0.40 -0.29 -0.19 -1.60 10.7 13.2 16.1 A
4/25/2017 96 --- 34.2 35.9 39.0 -0.46 -0.34 -0.23 -1.60 9.4 12.0 14.8 A
4/26/2017 96 --- 34.6 36.5 39.8 -0.54 -0.42 -0.25 -1.60 7.8 10.3 14.2 A
4/27/2017 96 --- 34.4 36.3 39.2 -0.57 -0.50 -0.39 -1.60 7.2 8.6 11.0 A:e
4/28/2017 96 --- 33.8 36.9 38.1 -0.63 -0.59 -0.55 -1.60 6.2 7.0 7.7 A:e
4/29/2017 96 --- 34.8 35.4 36.0 -0.59 -0.42 -0.13 -1.60 7.0 10.6 18 A
4/30/2017 96 --- 34.2 36.7 39.4 -0.43 -0.33 -0.14 -1.60 9.9 12.3 17 A:e
5/1/2017 96 --- 33.8 37.7 41.5 -0.57 -0.55 -0.52 -1.60 7.2 7.7 8.2 A:e
5/2/2017 96 --- 34.2 35.9 37.7 -0.67 -0.64 -0.58 -1.60 5.6 6.2 7.2 A:e
5/3/2017 96 --- 34.4 37.6 41.3 -0.71 -0.68 -0.65 -1.60 5.0 5.4 5.9 A:e
5/4/2017 96 --- 33.2 36.9 40.0 -0.75 -0.73 -0.70 -1.60 4.5 4.8 5.2 A:e
5/5/2017 96 --- 35.4 35.9 37.1 -0.73 -0.37 -0.04 -1.60 4.8 12.0 20 A
5/6/2017 96 --- 35.2 36.1 37.7 -0.34 -0.27 -0.19 -1.60 12.0 13.7 16.0 A
5/7/2017 96 --- 35.2 36.4 38.1 -0.45 -0.41 -0.34 -1.60 9.6 10.5 12.1 A
5/8/2017 96 --- 34.8 37.9 44.0 -0.53 -0.42 -0.28 -1.60 8.0 10.3 13.5 A:e
5/9/2017 96 --- 34.2 39.1 44.4 -0.54 -0.42 -0.28 -1.60 7.8 10.4 13.4 A:e
5/10/2017 96 --- 34.4 38.1 41.1 -0.55 -0.43 -0.24 -1.60 7.6 10.2 14.6 A:e
5/11/2017 96 --- 35.4 36.5 40.0 -0.22 0.06 0.23 -1.60 15.1 24 31 A
5/12/2017 96 --- 35.6 37.8 41.8 -0.25 -0.15 0.00 -1.60 14.4 17 22 A
5/13/2017 96 --- 35.4 37.7 42.0 -0.38 -0.33 -0.19 -1.60 11.1 12.4 15.9 A:e
5/14/2017 96 --- 34.8 37.6 40.9 -0.51 -0.46 -0.37 -1.60 8.3 9.4 11.4 A:e
5/15/2017 96 --- 35.4 36.6 37.1 -0.45 -0.12 0.48 -1.56 9.5 18 38 A
12/10/2021
Daily, _NfkHydrology.xlsx
Page 3 of 11
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
5/16/2017 96 --- 35.8 37.2 39.4 -0.19 -0.05 0.23 -1.43 11.7 15.3 24 A
5/17/2017 96 --- 36.4 37.6 40.3 -0.30 -0.25 -0.19 -1.43 9.1 10.1 11.7 A
5/18/2017 96 --- 36.4 38.4 42.4 -0.40 -0.35 -0.29 -1.43 7.2 8.3 9.4 A:e
5/19/2017 96 --- 35.0 40.8 45.5 -0.48 -0.39 -0.30 -1.43 5.9 7.4 9.1 A:e
5/20/2017 96 --- 35.0 39.7 42.8 -0.52 -0.47 -0.41 -1.43 5.4 6.1 7.0 A:e
5/21/2017 96 --- 35.6 37.6 39.2 -0.56 -0.51 -0.44 -1.43 4.7 5.5 6.5 A:e
5/22/2017 96 --- 36.4 38.5 42.0 -0.56 -0.52 -0.46 -1.43 4.8 5.4 6.3 A
5/23/2017 96 --- 37.3 39.0 42.8 -0.54 -0.39 -0.17 -1.43 5.0 7.7 12.1 A
5/24/2017 96 --- 35.2 38.9 44.2 -0.50 -0.41 -0.30 -1.43 5.7 7.1 9.1 A
5/25/2017 96 --- 36.0 38.5 42.6 -0.56 -0.51 -0.43 -1.43 4.7 5.4 6.7 A
5/26/2017 96 --- 35.2 39.0 41.5 -0.61 -0.60 -0.52 -1.43 4.1 4.3 5.4 A:e
5/27/2017 96 --- 35.2 39.0 46.6 -0.66 -0.63 -0.57 -1.43 3.5 3.9 4.6 A
5/28/2017 96 --- 36.6 39.2 43.1 -0.70 -0.66 -0.61 -1.43 3.1 3.6 4.1 A:e
5/29/2017 96 --- 35.4 42.4 47.7 -0.71 -0.60 -0.49 -1.43 3.0 4.4 5.8 A:e
5/30/2017 96 --- 38.7 39.1 39.8 -0.63 -0.46 -0.28 -1.43 3.8 6.4 9.6 A
5/31/2017 96 --- 37.9 40.3 44.4 -0.42 -0.34 -0.28 -1.43 6.9 8.3 9.5 A
6/1/2017 96 --- 38.5 40.2 42.6 -0.54 -0.48 -0.42 -1.43 5.0 6.0 7.0 A
6/2/2017 96 --- 37.9 41.3 48.4 -0.58 -0.52 -0.43 -1.43 4.4 5.4 6.8 A
6/3/2017 96 --- 37.7 38.7 40.0 -0.58 -0.35 0.03 -1.43 4.5 9.0 18 A
6/4/2017 96 --- 38.1 39.3 40.3 -0.25 -0.09 0.05 -1.43 10.1 14.1 18 A
6/5/2017 96 --- 39.0 43.4 50.3 -0.36 -0.30 -0.26 -1.43 7.9 9.1 10.1 A
6/6/2017 96 --- 39.8 42.4 47.1 -0.47 -0.41 -0.33 -1.43 6.1 7.1 8.6 A
6/7/2017 96 --- 39.4 44.3 52.4 -0.53 -0.46 -0.36 -1.43 5.2 6.3 8.0 A:e
6/8/2017 96 --- 40.0 45.1 52.8 -0.58 -0.51 -0.45 -1.43 4.5 5.5 6.5 A
6/9/2017 96 --- 39.8 43.5 46.9 -0.63 -0.59 -0.54 -1.43 3.9 4.4 5.1 A:e
6/10/2017 96 --- 40.9 41.8 43.1 -0.59 -0.52 -0.39 -1.43 4.3 5.4 7.5 A
6/11/2017 96 --- 39.6 42.2 46.2 -0.61 -0.58 -0.51 -1.43 4.1 4.5 5.5 A
6/12/2017 96 --- 38.5 43.9 49.6 -0.68 -0.65 -0.61 -1.43 3.3 3.7 4.1 A:e
6/13/2017 96 --- 38.7 45.1 53.3 -0.72 -0.67 -0.61 -1.43 2.9 3.4 4.1 A
6/14/2017 96 --- 41.1 43.9 47.5 -0.72 -0.68 -0.65 -1.43 2.9 3.3 3.7 A
6/15/2017 96 --- 41.3 44.1 49.3 -0.73 -0.70 -0.64 -1.43 2.8 3.1 3.7 A
6/16/2017 96 --- 39.6 42.4 44.6 -0.77 -0.74 -0.71 -1.43 2.4 2.7 3.0 A
6/17/2017 96 --- 41.8 42.6 43.3 -0.76 -0.74 -0.70 -1.43 2.4 2.7 3.0 A
6/18/2017 96 --- 41.6 44.5 49.1 -0.76 -0.74 -0.68 -1.43 2.4 2.7 3.3 A
6/19/2017 96 --- 42.8 44.1 46.4 -0.77 -0.74 -0.66 -1.43 2.4 2.7 3.5 A
6/20/2017 96 --- 41.6 43.4 45.1 -0.79 -0.78 -0.75 -1.43 2.2 2.3 2.5 A
6/21/2017 96 --- 42.2 44.4 46.9 -0.82 -0.81 -0.79 -1.43 2.0 2.1 2.2 A
6/22/2017 96 --- 42.0 45.7 51.2 -0.83 -0.82 -0.81 -1.43 1.9 2.0 2.1 A
6/23/2017 96 --- 43.1 44.4 45.9 -0.86 -0.85 -0.83 -1.43 1.7 1.8 1.9 A
6/24/2017 96 --- 41.3 44.2 46.4 -0.87 -0.84 -0.78 -1.43 1.6 1.8 2.3 A
6/25/2017 96 --- 43.5 45.3 48.2 -0.78 -0.48 -0.20 -1.43 2.3 6.3 11.2 A
6/26/2017 96 --- 43.5 45.9 49.1 -0.72 -0.67 -0.57 -1.43 2.9 3.5 4.6 A
6/27/2017 96 --- 42.6 45.3 49.3 -0.76 -0.74 -0.71 -1.43 2.5 2.7 3.0 A
6/28/2017 96 --- 43.9 48.2 55.4 -0.82 -0.79 -0.76 -1.43 2.0 2.2 2.5 A
6/29/2017 96 --- 44.4 45.8 47.5 -0.84 -0.83 -0.81 -1.43 1.8 1.9 2.0 A
6/30/2017 96 --- 44.2 45.7 47.7 -0.83 -0.81 -0.78 -1.43 1.9 2.1 2.3 A
7/1/2017 96 --- 43.9 46.9 53.3 -0.84 -0.81 -0.77 -1.43 1.8 2.1 2.4 A
7/2/2017 96 --- 44.6 45.9 47.7 -0.85 -0.83 -0.79 -1.43 1.7 1.9 2.2 A
7/3/2017 96 --- 43.7 46.5 50.5 -0.88 -0.86 -0.84 -1.43 1.5 1.7 1.8 A
7/4/2017 96 --- 43.9 46.5 51.2 -0.91 -0.89 -0.87 -1.43 1.3 1.5 1.6 A
7/5/2017 96 --- 43.5 46.0 49.3 -0.92 -0.90 -0.89 -1.43 1.3 1.4 1.5 A
7/6/2017 96 --- 44.4 45.9 48.2 -0.91 -0.90 -0.90 -1.43 1.3 1.4 1.4 A
7/7/2017 96 --- 44.6 46.0 48.2 -0.91 -0.86 -0.69 -1.43 1.3 1.7 3.1 A
7/8/2017 96 --- 46.2 46.4 46.8 -0.69 -0.44 -0.14 -1.43 3.1 7.1 12.9 A
7/9/2017 96 --- 44.0 46.5 50.5 -0.64 -0.56 -0.42 -1.43 3.8 4.8 7.0 A
7/10/2017 96 --- 44.4 46.6 49.1 -0.70 -0.64 -0.58 -1.43 3.0 3.8 4.5 A
7/11/2017 96 --- 43.5 47.7 53.7 -0.77 -0.74 -0.70 -1.43 2.4 2.7 3.0 A
7/12/2017 67 --- 44.6 47.6 54.7 -0.80 -0.78 -0.76 -1.43 2.1 2.3 2.4 A
GAP IN RECORD (Note 5).
8/22/2017 34 --- 43.9 44.9 56.8 -0.90 -0.87 -0.84 -1.43 1.4 1.6 1.8 A
8/23/2017 96 --- 43.9 44.2 44.9 -0.87 -0.86 -0.82 -1.43 1.6 1.7 2.0 A
8/24/2017 96 --- 43.3 45.9 48.0 -0.87 -0.75 -0.58 -1.43 1.6 2.6 4.5 A
8/25/2017 96 --- 44.4 45.2 46.4 -0.76 -0.71 -0.62 -1.43 2.5 3.0 4.0 A
8/26/2017 96 --- 43.5 44.6 46.4 -0.79 -0.75 -0.70 -1.43 2.3 2.6 3.1 A
8/27/2017 96 --- 42.6 43.6 44.8 -0.84 -0.81 -0.77 -1.43 1.8 2.1 2.4 A
8/28/2017 96 --- 42.9 44.0 45.9 -0.85 -0.83 -0.80 -1.43 1.7 1.9 2.2 A
8/29/2017 96 --- 43.9 45.4 47.1 -0.83 -0.54 -0.26 -1.43 1.9 3.9 6.6 A:e
8/30/2017 96 --- 44.2 45.1 46.0 -0.74 -0.55 -0.29 -1.43 2.6 3.2 4.0 A:e
8/31/2017 96 --- 42.6 44.1 45.7 -0.80 -0.76 -0.72 -1.43 2.1 2.4 2.8 A
9/1/2017 96 --- 43.7 44.6 46.0 -0.82 -0.80 -0.77 -1.43 2.0 2.1 2.4 A
9/2/2017 96 --- 44.2 45.0 45.5 -0.80 -0.65 -0.31 -1.43 2.1 3.8 9.0 A
9/3/2017 96 --- 44.6 45.4 46.4 -0.72 -0.51 -0.29 -1.43 2.9 5.6 9.4 A
9/4/2017 96 --- 43.9 44.7 45.5 -0.52 -0.29 -0.13 -1.43 6.0 8.8 13.1 A:e
9/5/2017 96 --- 44.6 45.7 47.1 -1.25 -0.43 -0.03 -1.43 4.2 4.9 6.0 A:e
9/6/2017 96 --- 44.4 45.3 46.2 -0.63 -0.53 -0.32 -1.43 3.9 5.3 8.7 A:e
9/7/2017 96 --- 43.9 45.3 46.4 -1.05 -0.49 -0.32 -1.43 4.5 5.3 6.4 A:e
9/8/2017 96 --- 43.1 43.8 44.8 -0.65 -0.62 -0.58 -1.43 3.6 4.0 4.5 A
9/9/2017 96 --- 43.3 44.3 45.7 -0.65 -0.60 -0.54 -1.43 3.6 4.2 5.0 A
9/10/2017 96 --- 44.6 45.3 46.6 -0.62 -0.57 -0.52 -1.43 3.9 4.6 5.3 A
9/11/2017 96 --- 44.4 45.2 46.2 -0.70 -0.66 -0.63 -1.43 3.1 3.5 3.9 A
9/12/2017 96 --- 45.3 46.9 49.4 -0.71 -0.65 -0.55 -1.43 2.9 3.7 4.9 A
9/13/2017 96 --- 44.9 46.0 47.3 -0.68 -0.66 -0.64 -1.43 3.3 3.5 3.8 A
9/14/2017 96 --- 44.9 46.0 47.5 -0.69 -0.65 -0.56 -1.43 3.2 3.6 4.8 A
9/15/2017 96 --- 42.8 44.6 45.7 -0.68 -0.21 0.07 -1.43 3.3 11.8 19 A:e
9/16/2017 96 --- 42.2 42.6 43.1 -0.36 -0.09 0.44 -1.43 7.9 14.2 27 A:e
9/17/2017 96 --- 42.0 42.2 42.8 -0.40 -0.21 0.47 -1.43 7.3 10.0 17 A:e
9/18/2017 96 --- 42.2 42.3 42.4 -0.54 -0.48 -0.40 -1.43 5.0 6.0 7.2 A
9/19/2017 96 --- 41.8 42.2 42.4 -0.62 -0.58 -0.53 -1.43 4.0 4.5 5.1 A
9/20/2017 96 --- 42.2 42.7 43.5 -0.62 -0.19 0.20 -1.43 4.0 12.1 23 A
12/10/2021
Daily, _NfkHydrology.xlsx
Page 4 of 11
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
9/21/2017 96 --- 42.6 42.6 42.9 -0.38 -0.26 0.01 -1.43 7.7 9.6 13.1 A:e
9/22/2017 96 --- 42.6 42.6 42.6 -0.37 0.15 0.49 -1.43 7.9 9.6 11.7 A:e
9/23/2017 96 --- 42.4 42.5 42.6 -0.46 -0.40 -0.33 -1.43 6.3 7.3 8.7 A
9/24/2017 96 --- 42.2 42.5 42.8 -0.55 -0.50 -0.44 -1.43 5.0 5.7 6.6 A
9/25/2017 96 --- 42.6 42.7 42.8 -0.58 -0.56 -0.53 -1.43 4.4 4.8 5.2 A
9/26/2017 96 --- 42.6 42.7 42.8 -0.63 -0.60 -0.56 -1.43 3.8 4.2 4.8 A
9/27/2017 96 --- 42.8 42.8 42.9 -0.66 -0.64 -0.61 -1.43 3.5 3.8 4.1 A
9/28/2017 96 --- 42.8 42.9 42.9 -0.65 -0.62 -0.58 -1.43 3.6 4.0 4.5 A
9/29/2017 96 --- 42.6 42.8 42.9 -0.88 -0.61 -0.29 -1.43 3.3 3.9 4.4 A:e
9/30/2017 96 --- 42.4 42.7 43.1 -0.71 -0.68 -0.65 -1.43 3.0 3.2 3.6 A
10/1/2017 96 --- 42.8 42.9 43.1 -0.73 -0.70 -0.65 -1.43 2.8 3.1 3.7 A
10/2/2017 96 --- 42.8 43.0 43.1 -0.72 -0.70 -0.67 -1.43 2.8 3.1 3.4 A
10/3/2017 96 --- 42.9 43.0 43.1 -0.75 -0.73 -0.70 -1.43 2.6 2.7 3.0 A
10/4/2017 96 --- 42.9 43.1 43.1 -0.74 -0.62 -0.44 -1.43 2.7 4.1 6.6 A
10/5/2017 96 --- 42.9 43.1 43.1 -0.73 -0.68 -0.63 -1.43 2.7 3.2 3.9 A
10/6/2017 96 --- 42.9 43.0 43.1 -0.76 -0.74 -0.70 -1.43 2.5 2.7 3.1 A
10/7/2017 96 --- 42.6 43.1 43.5 -0.75 0.19 1.47 -1.43 2.5 7.2 15.4 A:e
10/8/2017 96 --- 42.4 42.6 42.9 -0.80 -0.51 -0.23 -1.43 4.2 5.1 6.1 A:e
10/9/2017 96 --- 42.0 42.5 42.9 -0.66 -0.64 -0.60 -1.43 3.5 3.8 4.2 A
10/10/2017 96 --- 42.4 42.7 42.9 -0.71 -0.68 -0.66 -1.43 3.0 3.2 3.6 A
10/11/2017 96 --- 42.9 43.7 46.6 -0.77 -0.40 0.50 -1.43 2.4 8.4 25 A:e
10/12/2017 96 --- 42.8 43.5 45.3 -0.53 0.04 0.56 -1.43 10.8 14.9 21 A:e
10/13/2017 96 --- 41.5 42.3 42.9 -0.36 -0.29 -0.20 -1.43 7.9 9.3 11.4 A
10/14/2017 96 --- 42.0 42.4 42.9 -0.36 -0.15 0.02 -1.43 9.7 12.5 17 A:e
10/15/2017 96 --- 41.6 42.1 42.8 -0.35 -0.29 -0.21 -1.43 8.2 9.3 11.0 A
10/16/2017 96 --- 41.5 41.9 42.8 -0.46 -0.41 -0.35 -1.43 6.3 7.2 8.2 A
10/17/2017 96 --- 41.5 41.7 42.2 -0.35 -0.19 -0.04 -1.43 8.1 11.6 15.4 A
10/18/2017 96 --- 41.3 41.5 42.0 -0.37 -0.32 -0.22 -1.43 7.9 8.8 10.8 A
10/19/2017 96 --- 41.1 41.5 42.0 -0.48 -0.43 -0.36 -1.43 5.9 6.7 7.9 A
10/20/2017 96 --- 41.3 41.4 41.6 -0.53 -0.50 -0.48 -1.43 5.1 5.6 6.0 A
10/21/2017 96 --- 41.5 41.8 42.2 -0.64 -0.56 -0.51 -1.43 4.4 4.9 5.4 A:e
10/22/2017 96 --- 41.6 41.8 42.0 -0.64 -0.61 -0.58 -1.43 3.8 4.1 4.6 A
10/23/2017 96 --- 41.6 41.8 42.0 -0.67 -0.66 -0.63 -1.43 3.4 3.6 3.8 A
10/24/2017 96 --- 39.6 40.9 41.6 -0.84 -0.39 0.28 -1.43 3.2 9.0 26 A:e
10/25/2017 96 --- 40.0 41.4 42.6 -0.38 -0.19 0.13 -1.43 8.8 12.6 17 A:e
10/26/2017 96 --- 41.6 42.0 42.6 -0.41 -0.14 0.18 -1.43 8.7 11.9 19 A:e
10/27/2017 96 --- 41.3 41.9 42.4 -0.44 -0.40 -0.30 -1.43 6.6 7.3 9.1 A
10/28/2017 96 --- 41.6 42.1 42.4 -0.45 -0.31 -0.18 -1.43 6.4 9.0 11.8 A
10/29/2017 96 --- 41.6 42.7 43.1 -0.25 -0.01 0.28 -1.43 10.3 15.5 23 A:e
10/30/2017 96 --- 42.4 42.8 43.1 0.22 0.59 1.29 -1.43 10.5 13.2 16.9 A:e
10/31/2017 96 --- 42.6 42.8 43.1 -0.39 -0.09 1.58 -1.43 7.5 8.8 10.5 A:e
11/1/2017 96 --- 42.4 42.6 42.9 -0.50 -0.44 -0.38 -1.43 5.7 6.6 7.6 A
11/2/2017 96 --- 42.2 42.5 42.9 -0.57 -0.53 -0.49 -1.43 4.6 5.2 5.8 A
11/3/2017 96 --- 41.6 42.3 42.8 -0.62 -0.60 -0.57 -1.43 3.9 4.2 4.6 A
11/4/2017 96 --- 42.4 42.7 42.9 -0.64 -0.61 -0.55 -1.43 3.8 4.1 4.9 A
11/5/2017 100 --- 42.0 42.2 42.8 -0.66 -0.60 -0.51 -1.43 3.5 4.2 5.5 A
11/6/2017 96 --- 41.5 42.0 42.6 -0.70 -0.68 -0.65 -1.43 3.1 3.3 3.6 A
11/7/2017 96 --- 41.8 42.3 42.8 -0.72 -0.70 -0.64 -1.43 2.9 3.1 3.2 A:e
11/8/2017 96 --- 41.8 42.1 42.6 -0.76 -0.74 -0.71 -1.43 2.5 2.7 2.9 A
11/9/2017 96 --- 41.5 41.9 42.2 -0.75 -0.71 -0.66 -1.43 2.6 3.0 3.5 A
11/10/2017 96 --- 41.5 41.8 42.2 -0.77 -0.74 -0.72 -1.43 2.4 2.7 2.9 A
11/11/2017 96 --- 42.0 42.3 42.6 -0.79 -0.77 -0.73 -1.43 2.2 2.4 2.7 A
11/12/2017 96 --- 41.6 41.9 42.2 -0.81 -0.79 -0.78 -1.43 2.0 2.2 2.3 A
11/13/2017 96 --- 41.6 41.8 42.0 -0.81 -0.79 -0.76 -1.43 2.0 2.2 2.5 A
11/14/2017 96 --- 41.3 41.6 41.8 -0.83 -0.81 -0.80 -1.43 1.9 2.0 2.2 A
11/15/2017 96 --- 40.9 41.6 42.0 -0.83 -0.55 -0.21 -1.43 1.8 2.7 3.7 A:e
11/16/2017 96 --- 41.3 41.6 41.8 -0.78 -0.73 -0.63 -1.43 2.4 2.6 2.9 A:e
11/17/2017 96 --- 41.1 41.4 41.6 -0.82 -0.79 -0.76 -1.43 2.0 2.2 2.5 A:e
11/18/2017 96 --- 41.1 41.4 41.8 -0.83 -0.80 -0.27 -1.43 1.9 2.1 3.1 A:e
11/19/2017 96 --- 40.3 40.7 41.8 -0.78 -0.47 0.11 -1.43 2.3 2.7 3.1 A:e
11/20/2017 96 --- 40.2 40.2 40.3 -1.05 -0.84 -0.75 -1.43 2.0 2.2 2.5 A:e
11/21/2017 96 --- 38.3 39.6 40.2 -0.81 -0.63 -0.10 -1.43 1.8 2.5 4.0 A:e
11/22/2017 96 --- 38.5 39.6 40.0 -0.97 -0.67 -0.20 -1.43 2.1 3.1 5.8 A:e
11/23/2017 96 --- 39.0 39.3 39.8 -0.97 -0.75 -0.51 -1.43 2.3 2.6 3.0 A:e
11/24/2017 96 --- 36.9 38.3 39.2 -1.37 -0.93 -0.76 -1.43 2.0 2.1 2.3 A:e
11/25/2017 96 --- 36.2 37.2 38.1 -1.38 -1.00 -0.54 -1.43 1.8 2.2 5.0 A:e
11/26/2017 96 --- 36.6 37.1 38.3 -0.82 -0.63 -0.37 -1.43 1.9 4.0 7.8 A
11/27/2017 96 --- 36.4 37.8 40.0 -0.71 -0.16 0.32 -1.43 2.9 13.4 27 A
11/28/2017 96 --- 37.1 40.0 41.3 -0.36 -0.20 0.09 -1.43 8.0 11.6 19 A
11/29/2017 96 --- 40.9 41.2 41.3 -0.35 -0.08 0.48 -1.43 8.1 14.8 34 A
11/30/2017 96 --- 40.9 41.1 41.5 0.43 0.97 1.51 -1.44 32 62 105 A
12/1/2017 96 --- 40.7 41.2 41.8 0.37 0.66 1.02 -1.50 12.1 20 75 A:e
12/2/2017 96 --- 40.9 41.1 41.3 -0.40 -0.07 1.21 -1.50 8.6 10.1 12.1 A:e
12/3/2017 96 --- 40.7 40.9 41.1 -0.54 -0.44 -0.40 -1.50 6.7 7.7 8.6 A
12/4/2017 96 --- 40.9 41.3 41.3 -0.57 -0.53 -0.50 -1.50 5.6 6.3 6.8 A:e
12/5/2017 96 --- 41.3 41.3 41.5 -0.63 -0.60 -0.57 -1.50 4.8 5.2 5.6 A
12/6/2017 96 --- 41.3 41.4 41.5 -0.66 -0.64 -0.62 -1.50 4.4 4.6 4.9 A
12/7/2017 96 --- 41.3 41.3 41.5 -0.70 -0.67 -0.66 -1.50 3.9 4.2 4.4 A
12/8/2017 96 --- 40.9 41.2 41.3 -0.71 -0.69 -0.64 -1.50 3.7 4.0 4.6 A
12/9/2017 96 --- 40.5 40.8 41.1 -0.70 -0.61 -0.56 -1.50 3.9 5.0 5.8 A
12/10/2017 96 --- 40.9 41.0 41.1 -0.67 -0.64 -0.58 -1.50 4.3 4.6 5.5 A
12/11/2017 96 --- 40.9 40.9 41.1 -0.71 -0.69 -0.62 -1.50 3.7 4.0 4.9 A
12/12/2017 96 --- 40.3 40.6 40.9 -0.66 -0.60 -0.51 -1.50 4.4 5.2 6.6 A
12/13/2017 96 --- 40.5 40.7 40.9 -0.69 -0.66 -0.64 -1.50 4.0 4.3 4.7 A
12/14/2017 96 --- 39.0 40.5 40.7 -0.98 -0.69 -0.56 -1.50 3.6 4.1 5.8 A:e
12/15/2017 96 --- 35.2 38.9 40.3 -1.09 -0.56 0.01 -1.50 3.7 6.5 19 A:e
12/16/2017 96 --- 40.2 40.4 40.7 -0.74 -0.53 -0.06 -1.50 3.9 4.2 4.5 A:e
12/17/2017 96 --- 40.3 40.5 40.7 -0.73 -0.35 0.32 -1.50 3.5 3.8 3.9 A:e
12/18/2017 96 --- 33.6 38.5 40.3 -0.76 -0.58 0.16 -1.50 3.1 6.1 24 A
12/19/2017 96 --- 35.2 38.4 40.3 -0.42 0.00 0.80 -1.50 8.1 13.3 27 A:e
12/20/2017 96 --- 40.2 40.3 40.3 -0.57 -0.51 -0.43 -1.50 5.5 6.6 8.0 A:e
12/10/2021
Daily, _NfkHydrology.xlsx
Page 5 of 11
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
12/21/2017 96 --- 39.4 40.3 41.1 -0.74 -0.63 -0.45 -1.50 4.3 4.9 7.6 A:e
12/22/2017 96 --- 38.8 40.0 40.7 -0.43 0.19 0.48 -1.50 7.9 12.2 16.0 A:e
12/23/2017 96 --- 40.3 40.5 40.7 0.28 0.42 0.72 -1.50 7.1 8.2 9.6 A:e
12/24/2017 96 --- 40.3 40.5 40.5 -0.90 -0.30 0.79 -1.50 6.0 6.4 7.1 A:e
12/25/2017 96 --- 40.3 40.5 40.5 -0.61 -0.58 -0.54 -1.50 5.0 5.4 6.1 A
12/26/2017 96 --- 40.3 40.5 40.5 -0.66 -0.64 -0.61 -1.50 4.4 4.7 5.1 A
12/27/2017 96 --- 40.3 40.4 40.5 -0.69 -0.67 -0.65 -1.50 4.0 4.2 4.5 A
12/28/2017 96 --- 40.2 40.2 40.3 -0.72 -0.70 -0.68 -1.50 3.6 3.8 4.1 A
12/29/2017 96 --- 39.4 39.9 40.2 -0.75 -0.72 -0.69 -1.50 3.3 3.6 4.0 A
12/30/2017 96 --- 35.4 37.3 39.4 -0.75 -0.52 -0.15 -1.50 3.3 5.5 9.7 A:e
12/31/2017 96 --- 38.7 39.1 39.4 -0.69 -0.56 -0.34 -1.50 4.0 4.7 5.4 A:e
1/1/2018 96 --- 38.7 39.0 39.2 -0.90 -0.69 -0.50 -1.50 3.7 4.4 5.3 A:e
1/2/2018 96 --- 39.2 39.3 39.4 -0.90 -0.07 0.75 -1.50 3.3 3.5 3.7 A:e
1/3/2018 96 --- 39.0 39.2 39.2 -0.35 0.45 0.95 -1.50 3.0 3.2 3.3 A:e
1/4/2018 96 --- 35.0 37.8 39.0 -0.87 -0.39 0.12 -1.50 2.9 4.4 10.5 A:e
1/5/2018 96 --- 34.0 36.2 38.3 -0.28 0.08 0.76 -1.50 11.0 14.7 20 A:e
1/6/2018 96 --- 38.3 39.6 40.3 -0.46 0.68 1.30 -1.50 8.4 9.7 11.4 A:e
1/7/2018 96 --- 40.0 40.1 40.2 0.49 1.13 1.65 -1.50 6.9 7.6 8.4 A:e
1/8/2018 96 --- 40.0 40.1 40.3 -0.63 -0.27 0.67 -1.50 6.0 6.4 6.9 A:e
1/9/2018 96 --- 40.0 40.1 40.3 -0.59 -0.47 -0.12 -1.50 5.4 5.8 6.4 A:e
1/10/2018 96 --- 40.0 40.1 40.2 -0.82 -0.70 -0.52 -1.50 5.6 6.0 6.3 A:e
1/11/2018 96 --- 40.0 40.0 40.0 -0.83 -0.74 -0.64 -1.50 5.1 5.3 5.6 A:e
1/12/2018 96 --- 40.0 40.0 40.0 -0.88 -0.59 -0.24 -1.50 4.6 4.8 5.1 A:e
1/13/2018 96 --- 39.6 39.8 40.0 -0.91 -0.77 -0.67 -1.50 4.2 4.4 4.6 A:e
1/14/2018 96 --- 39.6 39.8 40.0 -0.88 -0.38 0.20 -1.50 3.9 4.0 4.2 A:e
1/15/2018 96 --- 39.8 39.8 39.8 -0.58 0.35 0.76 -1.50 3.6 3.7 3.9 A:e
1/16/2018 96 --- 39.2 39.5 39.8 0.37 0.63 0.94 -1.50 3.3 3.4 3.6 A:e
1/17/2018 96 --- 38.8 39.0 39.2 0.72 0.94 1.09 -1.50 3.1 3.2 3.3 A:e
1/18/2018 96 --- 38.1 38.4 38.8 -0.76 0.28 1.32 -1.50 3.0 3.1 3.4 A:e
1/19/2018 96 --- 37.3 37.7 38.1 -0.81 -0.78 -0.74 -1.50 2.7 3.0 3.4 A
1/20/2018 96 --- 36.6 36.9 37.3 -0.83 -0.82 -0.80 -1.50 2.5 2.6 2.8 A
1/21/2018 96 --- 35.2 35.9 36.6 -0.85 -0.82 -0.80 -1.50 2.3 2.5 2.8 A
1/22/2018 96 --- 35.4 35.7 35.8 -0.86 -0.85 -0.82 -1.50 2.2 2.3 2.5 A
1/23/2018 96 --- 35.2 35.4 35.8 -0.87 -0.86 -0.84 -1.50 2.1 2.2 2.4 A
1/24/2018 96 --- 35.4 35.7 35.8 -0.88 -0.87 -0.84 -1.50 2.0 2.1 2.4 A
1/25/2018 96 --- 34.4 35.0 35.4 -0.90 -0.89 -0.87 -1.50 1.9 2.0 2.1 A
1/26/2018 96 --- 32.4 33.5 34.4 -0.90 -0.85 -0.77 -1.50 1.9 2.0 2.4 A:e
1/27/2018 96 --- 32.8 33.0 33.4 -0.92 -0.88 -0.86 -1.50 1.7 2.0 2.2 A
1/28/2018 96 --- 33.0 33.2 33.2 -0.93 -0.92 -0.91 -1.50 1.7 1.7 1.8 A
1/29/2018 96 --- 33.2 33.4 33.6 -0.94 -0.93 -0.92 -1.50 1.6 1.6 1.8 A
1/30/2018 96 --- 33.4 33.6 33.8 -0.95 -0.94 -0.92 -1.50 1.5 1.6 1.8 A
1/31/2018 96 --- 33.6 33.7 33.8 -0.96 -0.95 -0.94 -1.50 1.5 1.5 1.6 A
2/1/2018 96 --- 33.4 33.6 33.8 -0.97 -0.96 -0.94 -1.50 1.4 1.4 1.6 A
2/2/2018 96 --- 33.4 33.7 33.8 -0.98 -0.97 -0.96 -1.50 1.3 1.4 1.5 A
2/3/2018 96 --- 32.0 32.8 33.6 -0.97 -0.72 -0.15 -1.50 1.4 4.4 14.3 A
2/4/2018 96 --- 32.8 33.2 33.4 -0.14 0.05 0.15 -1.46 10.5 18 23 A:e
2/5/2018 96 --- 33.4 33.9 34.6 -0.74 -0.28 0.41 -1.40 4.8 6.9 10.4 A:e
2/6/2018 96 --- 34.2 35.2 36.2 -1.18 -0.21 0.41 -1.40 3.0 3.8 4.8 A:e
2/7/2018 96 --- 35.2 35.6 36.4 -0.66 -0.58 -0.53 -1.40 3.2 4.2 4.8 A
2/8/2018 96 --- 33.8 35.0 35.8 -0.59 -0.47 -0.19 -1.40 4.0 5.7 8.7 A:e
2/9/2018 96 --- 34.8 36.7 37.7 -0.82 -0.61 -0.32 -1.40 4.9 5.9 8.2 A:e
2/10/2018 96 --- 34.8 36.2 37.3 -0.48 -0.17 0.30 -1.40 5.5 9.4 17 A:e
2/11/2018 96 --- 36.9 37.7 38.5 -0.50 0.10 0.49 -1.40 6.3 7.1 8.6 A:e
2/12/2018 96 --- 38.5 39.1 39.2 -0.50 0.13 0.86 -1.40 5.2 5.9 6.3 A:e
2/13/2018 96 --- 39.2 39.3 39.4 -0.58 -0.55 -0.50 -1.40 4.0 4.5 5.2 A
2/14/2018 96 --- 39.2 39.3 39.4 -0.62 -0.59 -0.56 -1.40 3.7 4.0 4.3 A
2/15/2018 96 --- 38.7 39.1 39.2 -0.61 -0.27 0.71 -1.40 3.7 5.5 9.8 A:e
2/16/2018 96 --- 39.0 39.1 39.2 -1.05 0.26 1.47 -1.40 3.7 4.3 5.3 A:e
2/17/2018 96 --- 37.1 38.6 39.0 -0.63 -0.33 0.28 -1.40 3.5 9.6 25 A
2/18/2018 96 --- 37.1 38.6 39.2 -0.41 0.20 1.10 -1.40 9.3 14.4 28 A:e
2/19/2018 96 --- 39.0 39.2 39.2 -0.37 -0.34 -0.27 -1.40 7.2 7.7 9.2 A
2/20/2018 96 --- 39.0 39.1 39.2 -0.44 -0.40 -0.35 -1.40 6.1 6.7 7.6 A
2/21/2018 96 --- 39.0 39.0 39.2 -0.44 -0.39 -0.35 -1.40 6.1 6.9 7.6 A
2/22/2018 96 --- 38.8 39.0 39.0 -0.50 -0.45 -0.36 -1.40 5.1 6.0 7.5 A
2/23/2018 96 --- 38.8 38.9 39.0 -0.66 -0.34 0.50 -1.40 4.0 5.4 7.0 A:e
2/24/2018 96 --- 38.7 38.7 38.8 -0.55 -0.50 -0.43 -1.40 4.5 5.2 6.3 A
2/25/2018 96 --- 38.7 38.7 38.8 -0.69 -0.42 0.22 -1.40 4.3 4.9 5.7 A:e
2/26/2018 96 --- 38.5 38.6 38.7 -0.59 -0.56 -0.51 -1.40 4.0 4.4 5.0 A
2/27/2018 96 --- 38.5 38.5 38.7 -0.64 -0.61 -0.58 -1.40 3.4 3.7 4.2 A
2/28/2018 96 --- 38.1 38.3 38.5 -0.68 -0.66 -0.64 -1.40 3.0 3.2 3.4 A
3/1/2018 96 --- 37.7 38.0 38.1 -0.85 -0.55 -0.05 -1.40 2.9 3.5 4.1 A:e
3/2/2018 96 --- 37.7 37.8 37.9 -0.26 -0.09 0.10 -1.40 2.9 3.2 3.6 A:e
3/3/2018 96 --- 37.5 37.7 37.7 -1.67 -0.34 0.38 -1.40 2.6 2.8 3.1 A:e
3/4/2018 96 --- 37.5 37.5 37.7 -0.73 -0.70 -0.68 -1.40 2.5 2.8 3.0 A
3/5/2018 96 --- 37.3 37.5 37.7 -0.74 -0.71 -0.69 -1.40 2.4 2.7 2.9 A
3/6/2018 96 --- 36.4 37.3 37.5 -0.90 -0.69 -0.45 -1.40 2.4 2.5 2.7 A:e
3/7/2018 96 --- 36.4 36.9 37.3 -0.67 -0.36 0.04 -1.40 2.3 6.2 16.9 A:e
3/8/2018 96 --- 36.0 36.7 37.3 -0.55 -0.44 -0.11 -1.59 7.6 9.6 12.8 A
3/9/2018 96 --- 37.1 37.5 37.7 -0.62 -0.59 -0.54 -1.60 6.4 7.0 7.7 A
3/10/2018 96 --- 37.1 37.4 37.5 -0.68 -0.65 -0.63 -1.60 5.5 5.9 6.3 A
3/11/2018 92 --- 36.6 36.8 37.1 -0.71 -0.68 -0.46 -1.60 4.7 5.2 5.5 A:e
3/12/2018 96 --- 36.4 36.4 36.6 -0.73 -0.55 -0.17 -1.60 4.3 4.5 4.7 A:e
3/13/2018 96 --- 36.0 36.4 36.6 -0.75 -0.68 -0.43 -1.60 3.9 4.1 4.3 A:e
3/14/2018 96 --- 36.0 36.1 36.2 -0.63 -0.43 -0.25 -1.60 3.6 3.7 3.9 A:e
3/15/2018 96 --- 34.0 35.0 36.2 -0.98 -0.56 -0.11 -1.60 3.5 7.8 18 A:e
3/16/2018 96 --- 34.4 35.9 37.5 -0.74 0.07 1.06 -1.60 10.3 15.4 24 A:e
3/17/2018 96 --- 36.7 37.6 38.3 -0.60 -0.01 1.08 -1.60 7.5 8.7 10.2 A:e
3/18/2018 96 --- 37.7 38.2 39.0 -0.59 -0.52 -0.42 -1.60 6.9 8.2 10.2 A:e
3/19/2018 96 --- 37.3 37.9 38.3 -0.61 -0.56 -0.46 -1.60 6.7 7.5 9.3 A
3/20/2018 96 --- 38.1 38.1 38.3 -0.66 -0.63 -0.60 -1.60 5.8 6.3 6.8 A
3/21/2018 96 --- 37.9 38.0 38.3 -0.68 -0.64 -0.60 -1.60 5.5 6.1 6.8 A
12/10/2021
Daily, _NfkHydrology.xlsx
Page 6 of 11
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
3/22/2018 96 --- 37.5 37.9 38.1 -0.72 -0.39 0.43 -1.60 6.5 8.6 19 A:e
3/23/2018 52 --- 37.5 37.7 37.9 -0.64 0.04 0.67 -1.60 6.1 6.8 7.7 A:e
GAP IN RECORD (Note 5).
9/11/2018 35 --- 43.3 43.3 43.5 -1.06 -1.06 -1.05 -1.60 1.4 1.5 1.5 A
9/12/2018 96 --- 42.9 43.3 43.7 -1.07 -1.05 -1.04 -1.60 1.4 1.5 1.6 A
9/13/2018 96 --- 43.5 43.6 43.9 -1.05 -1.03 -0.97 -1.60 1.5 1.7 2.1 A
9/14/2018 96 --- 43.5 43.6 43.7 -1.06 -1.04 -1.00 -1.60 1.5 1.6 1.9 A
9/15/2018 96 --- 43.3 43.5 43.7 -1.09 -1.07 -1.05 -1.60 1.3 1.4 1.5 A
9/16/2018 96 --- 43.3 43.5 43.7 -1.10 -1.06 -1.01 -1.60 1.2 1.4 1.8 A
9/17/2018 96 --- 43.3 43.4 43.5 -1.09 -1.07 -1.04 -1.60 1.3 1.4 1.6 A
9/18/2018 96 --- 43.3 43.4 43.7 -1.09 -1.07 -1.04 -1.60 1.3 1.4 1.6 A
9/19/2018 96 --- 43.3 43.4 43.5 -1.10 -1.09 -1.08 -1.60 1.2 1.2 1.3 A
9/20/2018 96 --- 43.5 43.6 43.9 -1.11 -1.10 -1.04 -1.60 1.1 1.2 1.6 A
9/21/2018 96 --- 43.5 43.7 43.9 -1.07 -0.99 -0.91 -1.60 1.4 2.0 2.7 A
9/22/2018 96 --- 43.7 43.7 43.9 -1.08 -1.05 -1.02 -1.60 1.3 1.5 1.7 A
9/23/2018 96 --- 43.5 43.5 43.7 -1.09 -1.07 -1.06 -1.60 1.2 1.4 1.5 A
9/24/2018 96 --- 43.3 43.5 43.7 -1.09 -1.06 -1.00 -1.60 1.3 1.4 1.9 A
9/25/2018 96 --- 43.3 43.5 43.7 -1.11 -1.09 -1.07 -1.60 1.1 1.3 1.4 A
9/26/2018 96 --- 43.5 43.7 44.0 -1.12 -1.10 -1.09 -1.60 1.1 1.2 1.2 A
9/27/2018 96 --- 43.9 44.0 44.4 -1.11 -0.99 -0.73 -1.60 1.1 2.1 4.7 A
9/28/2018 96 --- 43.7 44.1 44.6 -0.78 -0.29 -0.07 -1.60 4.1 14.0 20 A
9/29/2018 96 --- 42.9 43.3 43.7 -0.38 -0.18 -0.07 -1.60 11.1 16.2 19 A
9/30/2018 96 --- 42.6 43.6 47.3 -0.43 0.06 0.38 -1.60 10.0 25 37 A
10/1/2018 96 --- 43.1 43.8 47.1 -0.13 0.01 0.33 -1.60 18 22 35 A
10/2/2018 96 --- 42.9 43.3 44.0 -0.30 -0.13 0.19 -1.60 13.1 18 29 A
10/3/2018 96 --- 43.1 43.3 43.7 -0.29 -0.19 -0.10 -1.60 13.3 15.8 19 A
10/4/2018 96 --- 43.1 43.2 43.5 -0.41 -0.33 -0.21 -1.60 10.4 12.2 15.3 A
10/5/2018 96 --- 43.1 43.4 43.9 -0.45 -0.26 0.07 -1.60 9.6 14.3 24 A
10/6/2018 96 --- 43.3 43.6 43.9 -0.42 -0.38 -0.29 -1.60 10.1 11.1 13.2 A
10/7/2018 96 --- 43.3 43.8 44.2 -0.55 -0.48 -0.37 -1.60 7.6 9.1 11.4 A
10/8/2018 96 --- 43.7 43.9 44.2 -0.58 -0.34 -0.05 -1.60 7.2 12.5 20 A
10/9/2018 96 --- 43.3 43.7 44.0 -0.48 -0.37 -0.20 -1.60 9.0 11.4 15.7 A
10/10/2018 96 --- 42.9 43.6 44.0 -0.59 -0.54 -0.48 -1.60 7.0 7.9 9.0 A
10/11/2018 96 --- 43.3 44.0 44.0 -0.56 -0.34 -0.13 -1.60 7.4 12.2 18 A
10/12/2018 96 --- 42.6 43.3 44.2 -0.57 -0.51 -0.42 -1.60 7.3 8.4 10.3 A
10/13/2018 96 --- 43.1 43.7 44.0 -0.62 -0.59 -0.52 -1.60 6.4 7.0 8.1 A
10/14/2018 96 --- 43.9 44.2 44.4 -0.60 -0.28 -0.08 -1.60 6.7 13.8 19 A
10/15/2018 96 --- 44.2 44.4 44.4 -0.30 -0.23 -0.13 -1.60 13.1 14.7 18 A
10/16/2018 96 --- 44.0 44.3 44.6 -0.41 -0.33 -0.21 -1.60 10.4 12.4 15.4 A
10/17/2018 96 --- 43.9 44.2 44.6 -0.50 -0.45 -0.33 -1.60 8.6 9.5 12.3 A
10/18/2018 96 --- 43.7 44.1 44.4 -0.43 -0.37 -0.26 -1.60 10.1 11.4 14.1 A
10/19/2018 96 --- 43.1 43.6 44.2 -0.54 -0.49 -0.41 -1.60 7.8 8.9 10.5 A
10/20/2018 96 --- 43.3 43.6 43.9 -0.61 -0.57 -0.54 -1.60 6.6 7.2 7.7 A
10/21/2018 96 --- 43.3 43.6 43.9 -0.60 -0.49 -0.44 -1.60 6.7 8.7 9.8 A
10/22/2018 96 --- 43.3 43.6 44.0 -0.55 -0.50 -0.44 -1.60 7.5 8.6 9.8 A
10/23/2018 96 --- 42.9 43.4 44.0 -0.61 -0.57 -0.49 -1.60 6.7 7.3 8.7 A
10/24/2018 96 --- 42.6 43.1 43.5 -0.62 -0.45 -0.25 -1.60 6.4 9.8 14.2 A
10/25/2018 96 --- 42.6 43.0 43.3 -0.48 -0.41 -0.32 -1.60 9.0 10.5 12.6 A
10/26/2018 96 --- 42.8 43.2 43.5 -0.50 -0.44 -0.38 -1.60 8.6 9.8 11.2 A
10/27/2018 96 --- 42.6 42.9 43.3 -0.58 -0.51 -0.45 -1.60 7.1 8.3 9.5 A
10/28/2018 96 --- 42.6 42.7 42.9 -0.65 -0.62 -0.58 -1.60 5.9 6.4 7.1 A
10/29/2018 96 --- 42.8 43.0 43.7 -0.70 -0.68 -0.65 -1.60 5.2 5.5 6.0 A
10/30/2018 96 --- 42.8 43.1 43.7 -0.73 -0.71 -0.69 -1.60 4.8 5.0 5.3 A
10/31/2018 96 --- 43.1 43.6 43.9 -0.76 -0.74 -0.63 -1.60 4.4 4.7 6.2 A
11/1/2018 96 --- 43.5 44.1 44.4 -0.62 -0.49 -0.32 -1.60 6.4 8.9 12.5 A
11/2/2018 96 --- 44.0 44.3 44.4 -0.49 -0.28 -0.15 -1.60 8.7 13.5 17.0 A
11/3/2018 96 --- 44.0 44.2 44.4 -0.42 -0.36 -0.28 -1.60 10.2 11.6 13.5 A
11/4/2018 100 --- 43.1 43.9 44.4 -0.49 -0.41 -0.34 -1.60 8.8 10.5 12.1 A
11/5/2018 96 --- 42.8 43.2 43.7 -0.59 -0.54 -0.49 -1.60 7.0 7.8 8.8 A
11/6/2018 96 --- 42.8 43.1 43.7 -0.65 -0.62 -0.58 -1.60 5.9 6.4 7.1 A
11/7/2018 96 --- 42.6 42.9 43.5 -0.68 -0.65 -0.62 -1.60 5.5 5.9 6.4 A
11/8/2018 96 --- 42.4 42.9 43.7 -0.73 -0.70 -0.67 -1.60 4.8 5.2 5.6 A
11/9/2018 96 --- 42.2 42.7 42.9 -0.75 -0.73 -0.66 -1.60 4.5 4.8 5.8 A
11/10/2018 96 --- 42.4 42.8 43.1 -0.65 -0.27 -0.09 -1.60 5.9 14.0 19 A
11/11/2018 96 --- 42.4 42.6 43.1 -0.50 -0.37 -0.01 -1.60 8.5 11.5 21 A
11/12/2018 96 --- 42.6 42.9 43.3 -0.38 -0.25 -0.01 -1.60 11.1 14.5 22 A
11/13/2018 96 --- 42.6 42.9 43.3 -0.40 -0.28 -0.15 -1.60 10.6 13.6 17 A
11/14/2018 96 --- 42.6 42.9 43.3 -0.46 -0.42 -0.33 -1.60 9.4 10.2 12.2 A
11/15/2018 96 --- 43.1 43.2 43.3 -0.51 -0.44 -0.36 -1.60 8.5 9.8 11.5 A
11/16/2018 96 --- 42.8 43.1 43.5 -0.55 -0.50 -0.43 -1.60 7.7 8.7 10.1 A
11/17/2018 96 --- 42.9 43.1 43.7 -0.57 -0.52 -0.45 -1.60 7.2 8.2 9.5 A
11/18/2018 96 --- 42.2 42.6 42.9 -0.60 -0.55 -0.46 -1.60 6.7 7.6 9.4 A
11/19/2018 96 --- 42.2 42.5 42.9 -0.55 -0.50 -0.42 -1.60 7.6 8.7 10.1 A
11/20/2018 96 --- 42.0 42.3 42.6 -0.60 -0.54 -0.46 -1.60 6.8 7.7 9.3 A
11/21/2018 97 --- 41.8 42.0 42.0 -0.66 -0.62 -0.59 -1.60 6.0 6.5 6.9 A
11/22/2018 96 --- 41.6 42.0 42.0 -0.69 -0.66 -0.54 -1.60 5.3 5.8 7.9 A
11/23/2018 96 --- 41.5 42.2 42.6 -0.52 -0.42 -0.20 -1.60 8.1 10.3 15.6 A
11/24/2018 96 --- 42.2 42.5 42.6 -0.55 -0.49 -0.41 -1.60 7.6 8.7 10.5 A
11/25/2018 96 --- 42.2 42.3 42.4 -0.60 -0.56 -0.52 -1.60 6.7 7.4 8.2 A
11/26/2018 96 --- 41.6 41.9 42.2 -0.68 -0.62 -0.58 -1.60 5.7 6.5 7.0 A:e
11/27/2018 96 --- 41.5 41.6 41.8 -0.70 -0.68 -0.65 -1.60 5.2 5.5 6.0 A
11/28/2018 96 --- 41.1 41.4 41.5 -0.76 -0.71 -0.68 -1.60 4.4 5.0 5.4 A
11/29/2018 96 --- 40.7 41.1 41.3 -0.73 -0.65 -0.34 -1.60 4.7 6.1 12.0 A
11/30/2018 96 --- 36.6 40.5 42.2 -0.33 0.12 0.61 -1.60 12.3 27 49 A
12/1/2018 96 --- 37.7 42.0 42.4 -0.19 -0.09 0.24 -1.60 15.9 19 31 A
12/2/2018 96 --- 41.6 41.8 42.0 -0.41 -0.32 -0.20 -1.60 10.3 12.5 15.7 A
12/3/2018 96 --- 41.5 41.8 42.0 -0.47 -0.30 0.05 -1.60 9.2 13.4 24 A
12/4/2018 96 --- 41.5 41.7 42.0 -0.33 -0.27 -0.19 -1.60 12.2 13.7 16.1 A
12/5/2018 96 --- 41.5 41.7 41.8 -0.35 -0.29 -0.22 -1.60 11.8 13.3 15.1 A
12/10/2021
Daily, _NfkHydrology.xlsx
Page 7 of 11
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
12/6/2018 96 --- 41.6 41.7 41.8 -0.44 -0.37 -0.30 -1.60 9.7 11.3 13.1 A
12/7/2018 96 --- 41.1 41.3 41.6 -0.58 -0.50 -0.45 -1.60 7.1 8.5 9.6 A
12/8/2018 96 --- 40.5 40.9 41.1 -0.69 -0.59 -0.54 -1.60 6.6 7.0 7.9 A:e
12/9/2018 96 --- 40.5 40.7 41.1 -0.70 -0.61 -0.56 -1.60 6.0 6.6 7.5 A:e
12/10/2018 96 --- 40.3 40.5 40.7 -0.71 -0.67 -0.61 -1.60 5.1 5.7 6.6 A
12/11/2018 96 --- 40.2 40.4 40.5 -0.73 -0.71 -0.70 -1.60 4.8 5.0 5.3 A
12/12/2018 96 --- 40.3 40.7 41.1 -0.76 -0.74 -0.73 -1.60 4.4 4.6 4.8 A
12/13/2018 96 --- 40.5 40.8 41.1 -0.78 -0.77 -0.75 -1.60 4.1 4.3 4.5 A
12/14/2018 96 --- 40.7 41.0 41.3 -0.83 -0.80 -0.77 -1.60 3.5 3.9 4.2 A
12/15/2018 96 --- 40.9 41.1 41.1 -0.85 -0.82 -0.81 -1.60 3.3 3.6 3.8 A
12/16/2018 96 --- 40.9 41.1 41.3 -0.86 -0.84 -0.83 -1.60 3.1 3.4 3.6 A
12/17/2018 96 --- 40.7 41.1 41.3 -0.89 -0.87 -0.85 -1.60 2.9 3.1 3.3 A
12/18/2018 96 --- 40.9 41.1 41.3 -0.92 -0.89 -0.87 -1.60 2.6 2.8 3.1 A
12/19/2018 96 --- 41.1 41.2 41.3 -0.91 -0.90 -0.88 -1.60 2.7 2.8 2.9 A
12/20/2018 96 --- 41.1 41.2 41.3 -0.92 -0.91 -0.89 -1.60 2.6 2.7 2.8 A
12/21/2018 96 --- 40.7 41.0 41.1 -0.93 -0.92 -0.91 -1.60 2.5 2.6 2.7 A
12/22/2018 96 --- 40.2 40.5 40.7 -0.96 -0.93 -0.92 -1.60 2.2 2.4 2.6 A
12/23/2018 96 --- 40.3 40.4 40.5 -0.96 -0.95 -0.92 -1.60 2.2 2.3 2.5 A
12/24/2018 96 --- 40.2 40.3 40.3 -0.97 -0.96 -0.95 -1.60 2.1 2.2 2.3 A
12/25/2018 96 --- 40.0 40.0 40.2 -0.98 -0.97 -0.97 -1.60 2.0 2.1 2.2 A
12/26/2018 96 --- 39.8 40.0 40.0 -0.99 -0.98 -0.97 -1.60 2.0 2.1 2.1 A
12/27/2018 96 --- 39.8 39.8 40.0 -1.00 -0.99 -0.98 -1.60 1.9 2.0 2.1 A
12/28/2018 96 --- 39.6 39.8 40.2 -1.08 -1.03 -1.00 -1.60 1.7 1.8 1.9 A:e
12/29/2018 96 --- 40.0 40.2 40.3 -1.03 -0.96 -0.65 -1.60 1.7 2.3 6.0 A
12/30/2018 96 --- 40.0 40.2 40.5 -0.81 -0.67 -0.52 -1.60 3.8 5.7 8.2 A
12/31/2018 96 --- 40.3 40.6 40.7 -0.76 -0.71 -0.64 -1.60 4.4 5.1 6.1 A
1/1/2019 96 --- 40.5 40.8 40.9 -0.88 -0.83 -0.74 -1.60 2.9 3.6 4.6 A
1/2/2019 96 --- 40.3 40.5 40.5 -0.93 -0.91 -0.88 -1.60 2.5 2.7 3.0 A
1/3/2019 96 --- 40.2 40.3 40.5 -0.95 -0.94 -0.93 -1.60 2.3 2.4 2.5 A
1/4/2019 96 --- 39.6 40.0 40.2 -0.98 -0.96 -0.95 -1.60 2.1 2.2 2.3 A
1/5/2019 96 --- 39.2 39.6 39.8 -0.99 -0.97 -0.96 -1.60 2.0 2.1 2.2 A
1/6/2019 96 --- 38.8 39.1 39.2 -0.99 -0.98 -0.97 -1.60 1.9 2.0 2.1 A
1/7/2019 96 --- 38.7 39.0 39.2 -1.00 -0.98 -0.96 -1.60 1.8 2.0 2.3 A
1/8/2019 96 --- 39.0 39.1 39.2 -1.00 -0.99 -0.97 -1.60 1.9 2.0 2.1 A
1/9/2019 96 --- 39.0 39.3 39.4 -1.01 -1.00 -0.99 -1.60 1.8 1.9 2.0 A
1/10/2019 96 --- 39.2 39.3 39.4 -1.01 -1.01 -0.99 -1.60 1.8 1.8 2.0 A
1/11/2019 96 --- 39.0 39.1 39.2 -1.02 -1.01 -1.00 -1.60 1.7 1.8 1.9 A
1/12/2019 96 --- 38.8 39.0 39.2 -1.03 -1.00 -0.92 -1.60 1.7 1.9 2.5 A
1/13/2019 96 --- 39.0 39.4 39.8 -0.92 -0.76 -0.68 -1.60 2.6 4.4 5.5 A
1/14/2019 96 --- 39.8 40.0 40.2 -0.71 -0.63 -0.55 -1.60 5.1 6.3 7.6 A
1/15/2019 96 --- 40.0 40.2 40.3 -0.88 -0.81 -0.71 -1.60 3.0 3.7 5.0 A
1/16/2019 96 --- 39.6 40.1 40.5 -0.88 -0.76 -0.66 -1.60 2.9 4.4 5.8 A
1/17/2019 96 --- 39.8 40.2 40.5 -0.87 -0.84 -0.80 -1.60 3.0 3.4 3.9 A
1/18/2019 96 --- 40.3 40.4 40.5 -0.93 -0.91 -0.87 -1.60 2.5 2.7 3.1 A
1/19/2019 96 --- 40.3 40.3 40.5 -0.95 -0.93 -0.91 -1.60 2.3 2.4 2.6 A
1/20/2019 96 --- 40.0 40.3 40.3 -0.97 -0.95 -0.93 -1.60 2.1 2.3 2.5 A
1/21/2019 96 --- 40.0 40.1 40.2 -0.95 -0.87 -0.67 -1.60 2.3 3.1 5.6 A
1/22/2019 96 --- 39.8 40.0 40.2 -0.73 -0.66 -0.58 -1.60 4.8 5.8 7.0 A
1/23/2019 96 --- 39.8 40.0 40.2 -0.83 -0.79 -0.72 -1.60 3.6 4.0 4.8 A
1/24/2019 96 --- 39.6 39.9 40.0 -0.84 -0.80 -0.76 -1.60 3.4 3.8 4.3 A
1/25/2019 96 --- 39.4 40.0 40.2 -0.90 -0.86 -0.81 -1.60 2.8 3.1 3.7 A
1/26/2019 96 --- 39.0 39.8 40.3 -0.80 -0.11 0.25 -1.60 3.9 19 31 A
1/27/2019 96 --- 39.2 39.6 39.8 -0.53 -0.40 -0.22 -1.60 8.0 10.9 15.2 A
1/28/2019 96 --- 39.2 39.5 39.8 -0.69 -0.62 -0.53 -1.60 5.4 6.4 7.9 A
1/29/2019 96 --- 38.8 39.1 39.2 -0.76 -0.73 -0.68 -1.60 4.4 4.8 5.4 A
1/30/2019 96 --- 39.2 39.3 39.6 -0.81 -0.79 -0.76 -1.60 3.7 4.0 4.4 A
1/31/2019 96 --- 38.8 39.2 39.4 -0.84 -0.81 -0.67 -1.60 3.4 3.8 5.7 A
2/1/2019 96 --- 38.3 38.9 39.4 -0.72 -0.66 -0.59 -1.60 4.9 5.8 6.9 A
2/2/2019 96 --- 38.8 39.4 39.8 -0.70 -0.36 -0.12 -1.60 5.3 11.8 18 A
2/3/2019 96 --- 38.8 39.2 39.4 -0.32 -0.21 -0.07 -1.60 12.4 15.6 20 A
2/4/2019 96 --- 38.7 39.1 39.4 -0.33 -0.21 -0.10 -1.60 12.2 15.4 19 A
2/5/2019 96 --- 38.1 38.6 39.0 -0.51 -0.44 -0.33 -1.60 8.3 9.8 12.3 A
2/6/2019 96 --- 37.9 38.5 39.0 -0.48 0.01 0.25 -1.60 9.0 23 31 A
2/7/2019 96 --- 33.8 35.4 39.0 -0.07 0.23 0.64 -1.60 19 31 50 A
2/8/2019 96 --- 35.8 37.6 38.3 -0.28 -0.19 -0.07 -1.60 13.6 15.9 20 A
2/9/2019 96 --- 36.6 38.1 38.7 -0.25 -0.18 -0.13 -1.60 14.2 16.3 18 A
2/10/2019 96 --- 35.6 36.9 37.7 -0.42 -0.33 -0.20 -1.60 10.3 12.4 15.5 A
2/11/2019 96 --- 37.1 37.7 38.7 -0.43 -0.38 -0.32 -1.60 10.0 11.2 12.5 A
2/12/2019 96 --- 36.6 37.4 37.9 -0.50 -0.40 -0.36 -1.60 8.6 10.7 11.6 A
2/13/2019 96 --- 36.6 36.9 37.5 -0.58 -0.53 -0.48 -1.60 7.2 8.1 9.0 A
2/14/2019 96 --- 36.7 37.1 37.7 -0.62 -0.58 -0.54 -1.60 6.5 7.2 7.7 A
2/15/2019 96 --- 36.2 36.9 38.1 -0.61 -0.33 -0.05 -1.60 6.6 12.7 20 A
2/16/2019 96 --- 36.0 36.5 37.3 -0.51 -0.44 -0.37 -1.60 8.4 9.9 11.2 A
2/17/2019 96 --- 34.4 36.2 36.9 -0.54 -0.48 -0.41 -1.60 7.8 9.0 10.4 A
2/18/2019 96 --- 36.2 36.8 37.7 -0.54 -0.48 -0.43 -1.60 7.9 9.0 9.9 A
2/19/2019 96 --- 34.6 36.1 37.1 -0.57 -0.49 -0.34 -1.60 7.4 8.4 10.6 A:e
2/20/2019 96 --- 35.4 36.6 37.3 -0.58 -0.49 -0.40 -1.60 7.1 7.9 9.5 A:e
2/21/2019 96 --- 35.6 36.2 36.9 -0.63 -0.59 -0.57 -1.60 6.2 7.0 7.2 A
2/22/2019 96 --- 36.0 36.7 37.5 -0.65 -0.54 -0.26 -1.60 5.9 8.0 14.1 A
2/23/2019 96 --- 36.4 36.7 37.1 -0.47 -0.32 0.00 -1.60 9.2 12.8 22 A
2/24/2019 96 --- 36.0 36.5 37.1 -0.41 -0.28 -0.03 -1.60 11.1 13.8 21 A:e
2/25/2019 96 --- 36.4 36.8 37.3 -0.49 -0.41 -0.33 -1.60 9.4 10.5 12.4 A:e
2/26/2019 96 --- 36.4 36.9 37.9 -0.49 -0.44 -0.34 -1.60 7.9 9.6 12.0 A:e
2/27/2019 96 --- 36.4 36.9 37.3 -0.57 -0.55 -0.50 -1.60 7.2 7.6 8.1 A
2/28/2019 96 --- 36.4 36.9 37.3 -0.58 -0.42 -0.21 -1.60 7.1 10.5 15.5 A
3/1/2019 96 --- 36.0 36.7 37.9 -0.57 -0.50 -0.39 -1.60 7.3 8.5 10.9 A
3/2/2019 96 --- 36.2 36.7 37.9 -0.64 -0.60 -0.57 -1.60 6.1 6.7 7.3 A
3/3/2019 96 --- 36.2 36.9 37.5 -0.66 -0.62 -0.50 -1.60 5.8 6.4 8.5 A
3/4/2019 96 --- 36.2 36.8 37.1 -0.56 -0.37 -0.16 -1.60 7.4 11.6 16.9 A
3/5/2019 96 --- 35.8 36.3 37.5 -0.56 -0.47 -0.28 -1.60 7.4 9.3 13.4 A
3/6/2019 96 --- 34.6 35.7 36.2 -0.65 -0.60 -0.57 -1.60 5.9 6.7 7.3 A
12/10/2021
Daily, _NfkHydrology.xlsx
Page 8 of 11
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
3/7/2019 96 --- 35.0 36.4 37.3 -0.66 -0.61 -0.55 -1.60 5.8 6.6 7.7 A
3/8/2019 96 --- 34.8 36.2 36.9 -0.70 -0.61 -0.02 -1.60 5.2 6.9 21 A
3/9/2019 96 --- 35.2 36.2 36.9 -0.35 -0.23 0.00 -1.60 11.8 15.1 22 A
3/10/2019 92 --- 35.2 36.3 36.9 -0.53 -0.44 -0.34 -1.60 8.0 9.9 11.9 A
3/11/2019 96 --- 35.2 36.1 36.9 -0.59 -0.55 -0.40 -1.60 6.9 7.7 10.7 A
3/12/2019 96 --- 35.4 36.5 37.1 -0.60 -0.51 -0.41 -1.60 6.8 8.4 10.4 A
3/13/2019 96 --- 35.4 35.7 36.2 -0.67 -0.63 -0.59 -1.60 5.6 6.3 7.0 A
3/14/2019 96 --- 35.4 36.0 37.1 -0.69 -0.66 -0.65 -1.60 5.3 5.7 6.0 A
3/15/2019 96 --- 35.8 36.2 37.1 -0.74 -0.70 -0.67 -1.60 4.6 5.0 5.3 A:e
3/16/2019 96 --- 35.6 36.1 36.9 -0.76 -0.74 -0.73 -1.60 4.4 4.6 4.7 A
3/17/2019 96 --- 35.6 36.1 36.9 -0.77 -0.76 -0.75 -1.60 4.2 4.3 4.5 A
3/18/2019 96 --- 35.8 36.3 37.3 -0.80 -0.78 -0.76 -1.60 3.9 4.1 4.3 A
3/19/2019 96 --- 36.2 36.6 37.1 -0.82 -0.81 -0.79 -1.60 3.7 3.8 4.0 A
3/20/2019 96 --- 36.4 36.9 37.7 -0.82 -0.81 -0.79 -1.60 3.6 3.8 3.9 A
3/21/2019 96 --- 36.0 36.2 36.7 -0.83 -0.81 -0.79 -1.60 3.5 3.6 3.8 A:e
3/22/2019 96 --- 36.2 36.9 37.9 -0.86 -0.79 -0.68 -1.60 3.5 4.0 5.4 A:e
3/23/2019 96 --- 36.2 36.9 37.9 -0.78 -0.74 -0.69 -1.60 4.1 4.6 5.3 A
3/24/2019 96 --- 36.6 37.3 38.1 -0.81 -0.70 -0.41 -1.60 3.7 5.4 10.4 A
3/25/2019 96 --- 34.4 36.4 37.5 -0.40 0.01 0.46 -1.60 10.6 23 41 A
3/26/2019 96 --- 36.4 37.1 38.3 -0.43 -0.34 -0.17 -1.60 10.0 12.1 16.5 A
3/27/2019 96 --- 36.6 37.3 38.1 -0.57 -0.52 -0.43 -1.60 7.2 8.2 10.0 A
3/28/2019 96 --- 37.1 37.6 38.5 -0.64 -0.61 -0.58 -1.60 6.0 6.6 7.2 A
3/29/2019 96 --- 37.1 37.7 38.7 -0.69 -0.63 -0.57 -1.60 5.4 6.2 7.3 A
3/30/2019 96 --- 37.1 37.5 38.1 -0.68 -0.66 -0.60 -1.60 5.4 5.9 6.7 A
3/31/2019 96 --- 37.5 37.6 37.7 -0.64 -0.59 -0.50 -1.60 6.0 7.0 8.5 A
4/1/2019 96 --- 37.1 37.5 37.7 -0.50 -0.40 -0.25 -1.60 8.6 10.8 14.4 A
4/2/2019 96 --- 36.9 37.0 37.3 -0.28 -0.19 -0.09 -1.60 13.6 16.0 19 A
4/3/2019 96 --- 36.7 37.1 37.3 -0.12 -0.05 0.05 -1.60 18 20 24 A
4/4/2019 96 --- 36.9 37.3 38.1 -0.25 -0.17 -0.09 -1.60 14.3 16.5 19 A
4/5/2019 96 --- 36.9 37.4 38.3 -0.38 -0.34 -0.26 -1.60 11.1 12.0 14.1 A
4/6/2019 96 --- 36.7 37.3 38.1 -0.45 -0.41 -0.36 -1.60 9.6 10.4 11.5 A
4/7/2019 96 --- 36.6 37.2 38.3 -0.57 -0.52 -0.45 -1.60 7.2 8.2 9.5 A
4/8/2019 96 --- 36.6 37.1 37.7 -0.63 -0.60 -0.57 -1.60 6.2 6.7 7.3 A
4/9/2019 96 --- 36.7 37.4 38.1 -0.65 -0.64 -0.61 -1.60 5.9 6.1 6.5 A
4/10/2019 96 --- 36.9 37.4 37.7 -0.62 -0.48 -0.19 -1.60 6.4 9.3 16.0 A
4/11/2019 96 --- 36.7 37.3 38.1 -0.34 -0.29 -0.21 -1.60 11.9 13.2 15.5 A
4/12/2019 96 --- 36.9 37.3 38.1 -0.44 -0.39 -0.32 -1.60 9.9 11.0 12.5 A
4/13/2019 96 --- 36.9 37.3 37.9 -0.50 -0.46 -0.39 -1.60 8.5 9.4 10.9 A
4/14/2019 96 --- 36.9 37.5 38.3 -0.56 -0.50 -0.44 -1.60 7.5 8.5 9.8 A
4/15/2019 96 --- 36.9 37.1 37.3 -0.51 -0.46 -0.43 -1.60 8.4 9.4 9.9 A
4/16/2019 96 --- 36.4 36.8 37.1 -0.64 -0.58 -0.51 -1.60 6.2 7.2 8.4 A
4/17/2019 96 --- 36.0 36.4 37.1 -0.69 -0.67 -0.63 -1.60 5.3 5.7 6.3 A
4/18/2019 96 --- 36.2 37.1 39.0 -0.73 -0.71 -0.69 -1.60 4.8 5.1 5.4 A
4/19/2019 96 --- 36.0 36.8 38.3 -0.77 -0.75 -0.73 -1.60 4.3 4.5 4.8 A
4/20/2019 96 --- 36.0 37.1 38.8 -0.80 -0.78 -0.75 -1.60 3.8 4.2 4.5 A
4/21/2019 96 --- 35.6 36.1 36.9 -0.88 -0.80 -0.76 -1.60 3.0 3.9 4.4 A
4/22/2019 96 --- 35.6 35.8 36.4 -0.85 -0.83 -0.80 -1.60 3.3 3.5 3.9 A
4/23/2019 96 --- 35.6 36.1 36.9 -0.88 -0.85 -0.84 -1.60 3.0 3.3 3.4 A
4/24/2019 96 --- 35.6 36.6 38.1 -0.88 -0.86 -0.82 -1.60 2.9 3.2 3.6 A
4/25/2019 96 --- 35.8 36.8 38.3 -0.90 -0.86 -0.82 -1.60 2.8 3.1 3.6 A
4/26/2019 96 --- 36.0 36.7 37.7 -0.90 -0.87 -0.85 -1.60 2.8 3.0 3.2 A
4/27/2019 96 --- 36.7 37.0 37.3 -0.87 -0.77 -0.57 -1.60 3.0 4.4 7.2 A
4/28/2019 96 --- 36.9 37.3 37.7 -0.57 -0.52 -0.37 -1.60 7.3 8.2 11.3 A
4/29/2019 96 --- 37.1 37.3 37.5 -0.37 -0.22 -0.15 -1.60 11.3 15.2 17 A
4/30/2019 96 --- 37.1 37.3 37.7 -0.22 -0.14 -0.09 -1.60 15.2 17 19 A
5/1/2019 96 --- 37.1 37.5 38.1 -0.34 -0.30 -0.21 -1.60 12.1 13.1 15.4 A
5/2/2019 96 --- 36.6 37.4 38.3 -0.50 -0.45 -0.34 -1.60 8.6 9.5 12.1 A
5/3/2019 96 --- 36.7 37.7 39.0 -0.58 -0.52 -0.45 -1.60 7.1 8.2 9.5 A
5/4/2019 96 --- 36.9 37.4 37.7 -0.61 -0.56 -0.48 -1.60 6.7 7.5 8.9 A
5/5/2019 96 --- 37.1 37.5 37.9 -0.49 -0.36 -0.19 -1.60 8.7 11.8 16.0 A
5/6/2019 96 --- 36.9 37.6 38.8 -0.48 -0.41 -0.32 -1.60 9.0 10.4 12.5 A
5/7/2019 96 --- 36.7 37.8 39.0 -0.49 -0.43 -0.36 -1.60 8.8 9.9 11.5 A
5/8/2019 96 --- 37.3 37.8 38.5 -0.50 -0.47 -0.42 -1.60 8.5 9.3 10.3 A
5/9/2019 96 --- 37.1 37.9 39.0 -0.54 -0.49 -0.44 -1.60 7.8 8.8 9.8 A
5/10/2019 96 --- 37.1 37.9 38.8 -0.57 -0.53 -0.48 -1.60 7.2 8.1 8.9 A
5/11/2019 96 --- 36.9 37.9 39.0 -0.62 -0.56 -0.51 -1.60 6.4 7.4 8.4 A
5/12/2019 96 --- 37.3 37.6 38.3 -0.66 -0.62 -0.56 -1.60 5.7 6.4 7.5 A
5/13/2019 96 --- 36.9 37.6 38.5 -0.71 -0.67 -0.62 -1.60 5.0 5.6 6.5 A
5/14/2019 96 --- 36.9 37.7 38.5 -0.71 -0.68 -0.64 -1.60 5.0 5.4 6.1 A
5/15/2019 96 --- 37.3 38.1 39.2 -0.72 -0.69 -0.66 -1.60 4.9 5.3 5.8 A
5/16/2019 96 --- 37.3 37.9 38.5 -0.73 -0.69 -0.63 -1.60 4.8 5.4 6.2 A
5/17/2019 96 --- 36.9 38.0 39.6 -0.74 -0.70 -0.65 -1.60 4.6 5.1 5.9 A
5/18/2019 96 --- 37.5 38.1 39.2 -0.74 -0.67 -0.57 -1.60 4.6 5.7 7.3 A
5/19/2019 96 --- 37.1 38.3 40.2 -0.72 -0.63 -0.52 -1.60 5.0 6.4 8.1 A
5/20/2019 96 --- 37.5 38.1 38.8 -0.68 -0.64 -0.55 -1.60 5.5 6.2 7.6 A
5/21/2019 96 --- 37.5 38.3 39.2 -0.70 -0.62 -0.53 -1.60 5.3 6.4 8.0 A
5/22/2019 96 --- 37.9 38.0 38.1 -0.63 -0.43 -0.25 -1.60 6.3 10.3 14.3 A
5/23/2019 96 --- 37.7 38.3 39.2 -0.46 -0.40 -0.30 -1.60 9.4 10.6 13.0 A
5/24/2019 96 --- 37.7 38.0 38.3 -0.50 -0.38 -0.27 -1.60 8.5 11.2 13.7 A
5/25/2019 96 --- 37.3 38.0 38.7 -0.32 -0.27 -0.20 -1.60 12.5 13.8 15.8 A
5/26/2019 96 --- 38.1 38.5 39.2 -0.29 -0.24 -0.20 -1.60 13.3 14.5 15.7 A
5/27/2019 96 --- 38.1 38.4 39.0 -0.32 -0.29 -0.27 -1.60 12.4 13.2 13.7 A
5/28/2019 96 --- 38.1 38.3 38.8 -0.35 -0.33 -0.31 -1.60 11.7 12.2 12.8 A
5/29/2019 96 --- 38.1 38.7 39.4 -0.45 -0.38 -0.33 -1.60 9.7 11.2 12.3 A
5/30/2019 96 --- 38.3 38.6 39.8 -0.41 -0.33 -0.26 -1.60 10.5 12.4 13.9 A
5/31/2019 96 --- 38.1 38.5 39.0 -0.49 -0.44 -0.35 -1.60 8.9 9.8 11.9 A
6/1/2019 96 --- 38.3 38.7 39.2 -0.38 -0.33 -0.26 -1.60 11.1 12.3 14.1 A
6/2/2019 96 --- 38.1 39.2 40.9 -0.49 -0.46 -0.38 -1.60 8.7 9.4 11.0 A
6/3/2019 96 --- 38.7 39.7 41.3 -0.51 -0.46 -0.41 -1.60 8.4 9.3 10.4 A
6/4/2019 96 --- 38.5 39.8 42.4 -0.53 -0.47 -0.40 -1.60 8.1 9.2 10.7 A
6/5/2019 96 --- 38.5 40.2 43.1 -0.57 -0.50 -0.42 -1.60 7.3 8.6 10.2 A
12/10/2021
Daily, _NfkHydrology.xlsx
Page 9 of 11
UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
6/6/2019 96 --- 38.5 40.5 43.5 -0.60 -0.52 -0.42 -1.60 6.8 8.3 10.1 A
6/7/2019 96 --- 38.5 41.0 44.2 -0.62 -0.55 -0.48 -1.60 6.4 7.7 8.9 A
6/8/2019 96 --- 39.2 41.1 44.0 -0.67 -0.60 -0.53 -1.60 5.7 6.8 8.1 A
6/9/2019 96 --- 39.8 40.1 40.7 -0.69 -0.66 -0.62 -1.60 5.4 5.7 6.4 A
6/10/2019 96 --- 39.4 40.3 41.5 -0.73 -0.69 -0.67 -1.60 4.8 5.3 5.7 A
6/11/2019 96 --- 38.8 41.2 44.6 -0.75 -0.69 -0.61 -1.60 4.5 5.3 6.6 A
6/12/2019 96 --- 40.2 41.1 42.4 -0.77 -0.72 -0.62 -1.60 4.2 5.0 6.5 A
6/13/2019 96 --- 40.2 40.5 40.9 -0.62 -0.36 -0.23 -1.60 6.4 11.6 14.7 A
6/14/2019 96 --- 40.2 40.7 41.3 -0.49 -0.42 -0.29 -1.60 8.8 10.2 13.2 A
6/15/2019 96 --- 39.8 40.1 40.5 -0.59 -0.54 -0.48 -1.60 6.9 7.7 9.0 A
6/16/2019 96 --- 39.6 40.3 41.3 -0.64 -0.60 -0.53 -1.60 6.1 6.8 8.1 A
6/17/2019 96 --- 40.0 40.7 41.5 -0.65 -0.62 -0.59 -1.60 6.0 6.4 7.0 A
6/18/2019 96 --- 40.2 41.9 44.8 -0.70 -0.66 -0.63 -1.60 5.3 5.8 6.2 A
6/19/2019 96 --- 40.3 41.7 43.5 -0.75 -0.73 -0.69 -1.60 4.5 4.8 5.3 A
6/20/2019 96 --- 40.7 42.2 45.1 -0.77 -0.74 -0.71 -1.60 4.3 4.6 5.1 A
6/21/2019 96 --- 40.7 42.2 44.4 -0.79 -0.77 -0.75 -1.60 4.0 4.3 4.5 A
6/22/2019 96 --- 40.7 42.2 44.0 -0.81 -0.79 -0.77 -1.60 3.7 3.9 4.2 A
6/23/2019 96 --- 40.9 42.1 43.5 -0.84 -0.83 -0.81 -1.60 3.4 3.5 3.8 A
6/24/2019 96 --- 41.3 42.0 42.8 -0.87 -0.81 -0.65 -1.60 3.1 3.8 6.0 A
6/25/2019 96 --- 40.7 43.1 47.7 -0.75 -0.36 0.42 -1.60 4.5 13.8 39 A
6/26/2019 96 --- 39.2 44.1 47.7 0.04 0.44 1.15 -1.60 23 42 84 A
6/27/2019 96 --- 38.8 40.7 45.7 0.86 1.78 2.61 -0.60 33 61 125 A
6/28/2019 96 --- 38.8 38.8 38.8 0.94 1.12 1.40 -0.50 16.7 23 34 A
6/29/2019 96 --- 38.7 38.8 38.8 0.72 0.82 0.95 -0.50 11.1 13.6 17.0 A
6/30/2019 96 --- 38.7 38.8 38.8 0.60 0.66 0.73 -0.50 8.6 9.7 11.3 A
7/1/2019 96 --- 38.7 38.8 38.8 0.53 0.56 0.61 -0.50 7.2 7.8 8.7 A
7/2/2019 96 --- 38.7 38.8 38.8 0.47 0.50 0.53 -0.50 6.2 6.7 7.3 A
7/3/2019 96 --- 38.8 38.8 38.8 0.42 0.45 0.48 -0.50 5.5 5.9 6.4 A
7/4/2019 96 --- 38.8 38.8 38.8 0.39 0.41 0.44 -0.50 5.0 5.4 5.7 A
7/5/2019 96 --- 38.8 38.8 38.8 0.35 0.38 0.40 -0.50 4.5 4.9 5.2 A
7/6/2019 96 --- 38.8 38.8 38.8 0.35 0.36 0.37 -0.50 4.5 4.6 4.7 A
7/7/2019 96 --- 38.8 38.8 38.8 0.30 0.33 0.36 -0.50 3.9 4.3 4.6 A
7/8/2019 96 --- 38.8 38.8 39.0 0.30 0.32 0.38 -0.50 3.9 4.2 4.9 A
7/9/2019 96 --- 38.8 39.0 39.0 0.31 0.33 0.38 -0.50 4.0 4.3 4.8 A
7/10/2019 96 --- 39.0 39.0 39.0 0.28 0.29 0.32 -0.50 3.6 3.8 4.1 A
7/11/2019 96 --- 39.0 39.0 39.0 0.23 0.26 0.28 -0.50 3.1 3.4 3.7 A
7/12/2019 96 --- 39.0 39.0 39.2 0.24 0.36 0.58 -0.50 3.2 4.7 8.1 P
7/13/2019 96 --- 39.0 39.2 39.2 0.35 0.44 0.59 -0.50 4.5 5.8 8.4 P
7/14/2019 96 --- 39.2 39.2 39.4 0.34 0.38 0.44 -0.50 4.4 4.9 5.8 P
7/15/2019 96 --- 39.4 39.4 39.4 0.35 0.39 0.47 -0.50 4.5 5.1 6.3 P
7/16/2019 96 --- 39.4 39.5 39.6 0.31 0.34 0.38 -0.50 4.0 4.4 4.9 P
7/17/2019 96 --- 39.6 39.6 39.6 0.34 0.38 0.42 -0.50 4.4 4.9 5.5 P
7/18/2019 96 --- 39.6 39.7 39.8 0.31 0.33 0.35 -0.50 3.9 4.3 4.5 P
7/19/2019 96 --- 39.8 39.8 40.0 0.26 0.29 0.32 -0.50 3.4 3.7 4.1 P
7/20/2019 96 --- 39.8 40.0 40.0 0.22 0.25 0.27 -0.50 3.0 3.3 3.6 P
7/21/2019 96 --- 40.0 40.0 40.2 0.22 0.23 0.25 -0.50 3.0 3.1 3.3 P
7/22/2019 96 --- 40.2 40.2 40.3 0.20 0.22 0.23 -0.50 2.8 2.9 3.1 P
7/23/2019 96 --- 40.2 40.3 40.3 0.18 0.20 0.22 -0.50 2.6 2.8 3.0 P
7/24/2019 96 --- 40.3 40.4 40.5 0.18 0.19 0.20 -0.50 2.6 2.7 2.8 P
7/25/2019 96 --- 40.5 40.5 40.5 0.18 0.20 0.24 -0.50 2.5 2.8 3.2 P
7/26/2019 96 --- 40.5 40.6 40.7 0.16 0.18 0.20 -0.50 2.4 2.6 2.8 P
7/27/2019 96 --- 40.7 40.7 40.7 0.10 0.15 0.18 -0.50 1.9 2.3 2.5 P
7/28/2019 96 --- 40.7 40.9 40.9 0.06 0.09 0.11 -0.50 1.6 1.8 2.0 P
7/29/2019 96 --- 40.9 40.9 41.1 0.05 0.08 0.11 -0.50 1.5 1.8 1.9 P
7/30/2019 96 --- 40.9 41.1 41.1 0.06 0.10 0.16 -0.50 1.6 1.9 2.4 P
7/31/2019 96 --- 41.1 41.2 41.3 0.11 0.15 0.30 -0.50 2.0 2.4 3.9 P
8/1/2019 96 --- 41.3 41.3 41.3 0.07 0.10 0.12 -0.50 1.7 1.8 2.1 P
8/2/2019 96 --- 41.3 41.4 41.5 0.04 0.06 0.08 -0.50 1.4 1.6 1.7 P
8/3/2019 96 --- 41.5 41.5 41.5 -0.05 0.01 0.05 -0.50 0.9 1.3 1.5 P
8/4/2019 96 --- 41.5 41.6 41.6 -0.11 -0.03 0.01 -0.50 0.7 1.0 1.3 P
8/5/2019 96 --- 41.6 41.6 41.8 -0.11 -0.05 -0.02 -0.51 0.7 0.9 1.1 P
8/6/2019 96 --- 41.6 41.8 41.8 -0.12 -0.07 -0.03 -0.51 0.7 0.9 1.1 P
8/7/2019 96 --- 41.8 41.8 41.8 -0.09 -0.07 -0.04 -0.52 0.8 0.9 1.0 P
8/8/2019 96 --- 41.8 42.0 42.0 -0.15 -0.09 -0.05 -0.52 0.6 0.9 1.0 P
8/9/2019 96 --- 42.0 42.0 42.0 -0.20 -0.13 -0.08 -0.53 0.4 0.7 0.9 P
8/10/2019 96 --- 42.0 42.0 42.2 -0.21 -0.14 -0.10 -0.54 0.4 0.7 0.8 P
8/11/2019 96 --- 42.0 42.2 42.2 -0.24 -0.17 -0.12 -0.54 0.3 0.6 0.8 P
8/12/2019 96 --- 42.2 42.2 42.2 -0.25 -0.19 -0.14 -0.55 0.3 0.5 0.7 P
8/13/2019 96 --- 42.2 42.2 42.4 -0.28 -0.22 -0.16 -0.55 0.3 0.5 0.7 P
8/14/2019 96 --- 42.2 42.4 42.4 -0.31 -0.23 -0.17 -0.56 0.2 0.4 0.6 P
8/15/2019 96 --- 42.4 42.4 42.4 -0.32 -0.25 -0.20 -0.57 0.2 0.4 0.6 P
8/16/2019 96 --- 42.4 42.4 42.4 -0.34 -0.28 -0.23 -0.57 0.2 0.3 0.5 P
8/17/2019 96 --- 42.4 42.5 42.6 -0.34 -0.28 -0.23 -0.58 0.2 0.3 0.5 P
8/18/2019 96 --- 42.6 42.6 42.6 -0.34 -0.26 -0.19 -0.58 0.2 0.4 0.7 P
8/19/2019 96 --- 42.6 42.6 42.6 -0.35 -0.29 -0.24 -0.59 0.2 0.3 0.5 P
8/20/2019 96 --- 42.6 42.6 42.6 -0.33 -0.29 -0.25 -0.59 0.2 0.4 0.5 P
8/21/2019 96 --- 42.6 42.7 42.8 -0.30 0.10 0.26 -0.92 0.3 8.2 14.0 P
8/22/2019 96 --- 42.8 42.8 42.8 -0.12 -0.05 0.03 -1.10 6.4 7.7 9.1 P
8/23/2019 96 --- 42.8 42.8 42.8 -0.19 -0.14 -0.11 -1.10 5.4 6.2 6.6 P
8/24/2019 96 --- 42.8 42.8 42.9 -0.17 -0.09 0.10 -1.10 5.6 7.0 10.5 P
8/25/2019 96 --- 42.9 42.9 42.9 -0.08 -0.02 0.18 -1.10 7.2 8.2 12.4 P
8/26/2019 96 --- 42.9 42.9 42.9 -0.09 -0.03 0.09 -1.10 7.0 8.1 10.4 P
8/27/2019 96 --- 42.9 42.9 43.1 -0.14 -0.10 -0.05 -1.10 6.0 6.8 7.7 P
8/28/2019 96 --- 42.9 43.1 43.1 -0.19 -0.15 -0.13 -1.10 5.3 5.9 6.3 P
8/29/2019 96 --- 43.1 43.1 43.3 -0.18 0.06 0.84 -1.10 5.5 11.5 35 P
8/30/2019 96 --- 43.1 43.2 43.3 0.19 0.29 0.54 -1.10 12.7 15.6 23 P
8/31/2019 96 --- 43.1 43.6 45.5 0.16 0.84 1.84 -0.85 12.0 28 71 P
9/1/2019 96 --- 43.5 43.5 43.7 0.71 1.10 1.54 -0.60 13.3 27 45 P
9/2/2019 96 --- 43.5 43.6 43.7 0.57 0.70 0.86 -0.60 10.1 13.0 17 P
9/3/2019 96 --- 43.7 43.7 43.7 0.44 0.50 0.58 -0.60 7.4 8.6 10.2 P
9/4/2019 96 --- 43.7 43.8 43.9 0.37 0.41 0.69 -0.60 6.2 7.0 12.7 P
12/10/2021
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UNGA MAN CREEK NEAR FALSE PASS, ALASKA POLARCONSULT ALASKA, INC.
NORTH FORK GAUGING STATION 12/10/2021
DAILY HYDROLOGY STATISTICS
Record Air Temperature (F) (Note 2)Water Temperature (F) (Note 2)Creek Stage (ft, OSS Datum) SD Offset (ft) Calculated Flow (cfs) (Note 4)Data
Date Count Minimum Average Maximum Minimum Average Maximum Minimum Average Maximum (Note 3)Minimum Average Maximum Status
9/5/2019 96 --- 43.9 44.0 44.6 0.69 1.53 1.99 -0.60 12.8 47 73 P
9/6/2019 96 --- 44.0 44.2 44.6 1.03 1.38 1.80 -0.60 23 39 60 P
9/7/2019 96 --- 44.2 44.3 44.4 0.73 0.85 1.02 -0.60 13.8 17 23 P
9/8/2019 96 --- 44.4 44.6 44.8 0.71 0.85 1.11 -0.60 13.1 17 26 P
9/9/2019 96 --- 44.8 44.9 45.1 0.62 0.67 0.77 -0.60 11.1 12.4 14.8 P
9/10/2019 96 --- 45.1 45.2 45.5 0.51 0.55 0.62 -0.60 8.7 9.7 11.1 P
9/11/2019 96 --- 45.5 45.6 45.9 0.50 0.60 0.77 -0.60 8.5 10.8 14.7 P
9/12/2019 96 --- 45.9 45.9 46.0 0.51 0.56 0.67 -0.60 8.8 9.8 12.1 P
9/13/2019 96 --- 46.0 46.2 46.4 0.53 0.57 0.61 -0.60 9.2 9.9 10.9 P
9/14/2019 96 --- 46.4 46.5 46.6 0.46 0.51 0.61 -0.60 7.9 8.7 10.9 P
9/15/2019 96 --- 46.6 46.7 46.8 0.43 0.47 0.53 -0.60 7.3 8.0 9.1 P
9/16/2019 96 --- 46.8 46.8 46.9 0.38 0.41 0.46 -0.60 6.5 7.0 7.7 P
9/17/2019 29 --- 46.9 46.9 46.9 0.38 0.40 0.42 -0.60 6.5 6.7 7.1 P
GAP IN RECORD DUE TO FULL MEMORY (Note 5).
3/10/2021 ADDITIONAL DATA NOT DOWNLOADED YET.
NOTES:
1 Record count is the number of individual readings collected daily by logging equipment. Equipment is configured for a 15-minute logging interval.
2 Air temperature data was not collected by the hardware installed at this station throughout the period of record. Water temperature was recorded throughout the period of record.
Manufacturer's reported temperature sensor accuracy is +/- 0.44 degrees Celcius.
3 SD Offset' represents shifts made to the stage-discharge curve to reflect changing site conditions over time. It corresponds to the vertical distance from the OSS zero reference
down to the point of zero flow in the creek at the station cross section.
4 Calculated flow greater than 17 cfs is more than double the highest flow measurement at this station and is indicated by a lighter italic font.
Such flows are calculated from an extrapolated station rating curve and are less certain than lower flows (see hydrology memo narrative).
5 Data from 7/12/2017 to 8/22/2017 not collected do to equipment failure. Data from 3/23/2018 to 9/11/2018 and 9/17/2019 to 3/10/2021 not collected due to full logger memory.
6 Station established August 16, 2016. Data reported through most recent download March 10, 2021. Station remains in service as of most recent download.
ABBREVIATIONS:
cfs: cubic feet per second.
F: Fahrenheit
ft: feet
OSS: Outside staff.
data status: A Flow calculated from accepted final analysis of available site data.Values 8/18/2016 to 7/11/2019 are accepted and final.
A:e Estimated flow calculated from accepted final analysis of available site data. Values after 7/11/2019 are provisional.
P Flow calculated from provisional analysis of available site data.
P:e Estimated flow calculated from provisional analysis of available site data.
All provisional flows are subject to adjustment and revision.
Estimates typically necessary due to transient sensor error, ice affected stage record, or water level below sensor elevation.
Estimated daily statistics are created from available actual or estimated data, which may not represent a full day of data at the programmed logging rate.
Daily statistics are flagged as estimated if more than 3% of individual record for that day are estimated.
12/10/2021
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City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
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City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
APPENDIX D – RESOURCE DATA AND ANALYSIS
Section Title Page Nos.
D.1 Maximum Probable Flood Estimate......................................................... D‐2
D.2 Flood Hazard Considerations................................................................... D‐2
D.3 Creek Basin Characteristics and Geomorphology.................................... D‐3
D.4 Geotechnical Considerations................................................................... D‐5
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report D ‐ 1
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City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report D ‐ 2
D.1 MAXIMUM PROBABLE FLOOD ESTIMATE
Flood magnitude estimates for Unga Man Creek are presented in Section 4 of the hydrology
report included in Appendix C.
D.2 FLOOD HAZARD CONSIDERATIONS
A brief discussion of principal flood hazards for the recommended hydroelectric project follow:
1. Creek meander. Unga Man Creek above, throughout, and below the proposed project reach
exhibits active meanders within a generally well defined flood corridor along the valley floor.
The main creek channel can be expected to shift anywhere within the corridor during the life of
the project. Some long term expansion of this corridor can also be expected, as the creek
erodes its cut banks over time.
1a. The diversion structure will need to be designed and built so it can ‘intercept’ the creek
anywhere within its flood corridor and direct flow to the project intake and spillways. This may
result in the creek flowing parallel to the diversion wingwalls from a variable point of
interception to the spillways, and the wingwalls will need to be designed for this.
1b. To the extent practical, the project access road and utility corridor has been located
outside of the flood corridor and set back from existing cut banks to reduce exposure to these
hazards. The first 200 to 300 feet of the access road downstream of the diversion site may be
located within or proximate to the flood corridor. Portions of the road prism susceptible to
flooding or erosion should be armored to prevent damage.
1c. The powerhouse site is shielded from creek meander by the landfill road prism and
bridge. Sitework should armor against creek meander towards the powerhouse site, which may
also provide incrementally enhanced protection for both the road and landfill. Because the
creek meander is constrained by the road bridge just upstream, there is limited risk of the
project tailrace becoming stranded by natural creek meandering.
2. Creek bed load. During high flow events, Unga Man Creek can be expected to transport
significant bedload downstream. This bed load will be captured behind the diversion structure
until the impoundment is filled. This is expected, and the intake and diversion spillways
conceptual designs can operate with the diversion structure filled with sediment and passing
sediment over them into the bypass reach of the project.
3. Minor drainages. The project access road and utility corridor crosses several small drainages
along the north side of the Unga Man basin. These have not been reviewed in detail for flood
magnitude. Design of these water crossings should include appropriate provisions to pass local
flood flows.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report D ‐ 3
D.3 CREEK AND MAJOR TRIBUTARY GEOMORPHOLOGY WITHIN STUDY AREA
D.3.1 Basin Characteristics
Unga Man Creek is an approximately 1.6 mile‐long creek with three significant unnamed
tributaries each of which is 1 to 2 miles long. The creek drains an east‐northeast facing basin
measuring 3.78 square miles in total area. The basin is a low‐elevation mountain valley aligned
on a generally east‐west axis and measuring approximately 2.5 miles long by 1.5 miles wide. It
is ringed by mountains to the south, west, and north that rise to elevations of approximately
1,100 to 2,800 feet, with the highest peaks along the southwest perimeter of the basin. The
lowest elevation in the basin is sea level along the east basin perimeter at the creek’s mouth.
Approximately ¼ of the basin area, along the valley floor and lower mountain slopes, is
vegetated by deciduous brush and shrubs. Dominant brush species include willows, alders, and
salmon berry. The vegetation line occurs at 700 to 1,000 foot elevation, depending on local
terrain conditions. Approximately ¾ of the basin area is alpine terrain located above the brush
line, and consists of tundra or barren ground. There are no significant glaciers or lakes in the
basin. Existing development within the basin consists of a gravel access road, road bridge at
river mile (RM 0.55), and solid waste landfill. All of these are located on the creek’s alluvial fan.
Unga Man Creek’s headwaters are three unnamed alpine tributaries located on the west and
south portions of the basin (Figure A‐1). These are called the north, south, and east forks in this
study. Respective basin areas are summarized in Table D‐1. The north and south forks drain
predominately alpine terrain in the west 2/3rd of the basin and combined comprise 69% of the
total basin area. The confluence of these two creeks is on the main valley floor at river mile
(RM) 1.6. The east fork drains a smaller subbasin that is roughly half alpine and half vegetated
foothills. It joins the main stem at RM 1.4. Subbasin area directly tributary to the main stem
consists mostly of vegetated valley floor and valley side slopes, with limited alpine area along
the northerly periphery of the drainage basin. Creek and tributary geomorphology in the
project vicinity are described in detail in Section D.3.2.
Table D‐1 Unga Man Creek Sub‐Basin Areas
Sub‐Basin Sub‐Basin Area
(square miles)
Percentage of
Total Basin
North fork tributary 1.39 37%
South fork tributary 1.20 32%
East fork tributary 0.43 11%
Tributary to main stem, east fork confluence to tidewater 0.76 20%
Total Unga Man Creek drainage basin area 3.78 100%
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report D ‐ 4
D.3.2 Creek and Tributary Geomorphology
As the main stem of Unga Man Creek ascends from tidewater up to the north/south confluence
at RM 1.6, the stream bed gradient progressively steepens. Near tidewater (RM 0.0) the
gradient is 1.5 percent, at the road bridge (RM 0.5) the gradient is 2.5 percent, and at the north
/ south fork confluence (RM 1.6) the gradient is 5 percent. From RM 0.55 to tidewater, the
main stem flows down its alluvial fan. In this reach, the creek actively meanders within a
floodplain that is 30 to 250 feet wide, with active five to ten plus foot tall cut banks typically
present along both sides of the floodplain.
From RM 0.55 upstream to RM 1.4, the creek flows down the 400‐foot wide main valley floor
and is confined by topography to the south side of the valley floor. Unga Man Creek meanders
within a 50 to 100 foot wide active floodplain corridor through this reach. This corridor is
bounded by the valley sidewall or local cut banks along river‐right (south bank). At the three
locations where it is pinned against the south valley wall, the creek has created active cut banks
10s of feet tall. The creek is typically bounded by local cut banks five to ten plus feet tall along
river left (north bank) through this reach.
Above RM 1.4, the creek shifts to the north side of the valley floor, and the north fork remains
on the north side of the valley upstream to the valley headwall at RM 2.1. Creek morphology,
including the meandering character and presence of an actively scoured and degraded
floodplain corridor, are similar to conditions downstream of RM 1.4.
The channel shift from the north to the south side of the valley floor at RM 1.4 appears to be
due to an alluvial cone from a minor left‐lateral tributary at this location that shunts the creek
to the south (right). Downstream terrain on the north side of the valley is generally higher than
the south side, perhaps due to greater deposition rates of alluvial/colluvial material from the
taller mountain slopes along this side of the valley.
From its confluence at RM 1.4, the east fork steeply ascends the south valley wall, with
gradients exceeding 20 percent starting just 150 feet upstream of its confluence with the main
stem. The east fork generally maintains gradients steeper than 10 percent to its headwaters.
East fork geomorphology was not observed during field work for this project.
Above its mouth at RM 1.6, the south fork stays on the main valley floor for about ¼ mile at a
gradient of 7.5 percent, then ascends to the alpine via an incised ravine at a gradient of 12+
percent. The south fork bifurcates into several headwater tributaries at RM 2.8.
Creek geomorphology up to RM 2.2 is mostly a continuous cascade‐pool sequence, with three‐
to six‐foot tall cascades formed by jumbles of large boulder and prevailing large substrate of
cobbles and boulders. Exposures of consolidated material in the creek bed and river‐right bank
near RM 1.8 are isolated instances up to RM 2.2.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report D ‐ 5
Above its mouth at RM 1.6, the north fork stays on the main valley floor for about ½ mile to RM
2.1 at a gradient of 8 percent, then ascends the valley headwall at gradients exceeding 20
percent and progressively bifurcates into several small headwater tributaries. Creek
geomorphology up to RM 2.1 is similar to the main stem reach above RM 1.4.
D.4 GEOTECHNICAL CONSIDERATIONS
D.4.1 Geologic Setting
False Pass is located on Unimak Island, the first of the major Aleutian Islands at the western end
of the Alaska Peninsula. Unimak Island is part of the East‐Aleutian Volcanic Arc, consisting of a
chain of volcanic islands located along the crest of a submarine ridge. The adjacent Aleutian
Trench is one of the world’s most active tectonic plate boundary zones, where the Pacific Plate
is subducting under the North American Plate. This fault zone generates great earthquakes,
including:
M8.2 (2021), approximately 200 miles east of the project site.
M7.0 (1991), approximately 75 miles east‐southeast of the project site.
M8.6 (1946), approximately 50 miles south of the project site.
M8.3 (1938), approximately 200 miles east of the project site.
The area is noted for its mix of recent volcanic terrain and Pleistocene glacial features. The
landscape is generally rugged and steep, the result of volcanic activity, extensive glaciation, and
subsequent glacial erosion. There are seven historically active volcanoes within a 100‐mile
radius of the site, with Shishaldin Volcano being the closest, located near the center of Unimak
Island approximately 24 miles west of the site.17
Round Top Volcano is the closest volcano to the project site (approximately 10 miles to the
west‐southwest) and has been active in the Holocene (~8,000 years ago) but not in historical
time. Other nearby volcanoes on Unimak Island include Unimak and Isanotski.18
Figure D‐1 presents an inset of the USGS’ regional geologic map for the project area. Geologic
map units occurring within the Unga Man Creek basin include:
‐ Qaf: Alluvial fan deposits (Quaternary).
‐ QTv: Volcanic rocks (Quaternary and Pliocene).
17 Adapted from narrative in Golder 2014.
18 AVO 2017.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report D ‐ 6
Figure D‐1 Geologic Map Detail of the Project Area
Detail from Plate 1, USGS 1997.
D.4.2 Bedrock Geology
There are no known bedrock exposures in the proposed project footprint, and bedrock is
assumed to not be available for project engineering design.
Exposures of a consolidated stratum that may be a volcanic conglomerate occur along the
south fork at RM 1.80 to RM 1.85 (Photographs B‐7, B‐10, and B‐11). Where exposed to flowing
water these materials retard erosion, but decompose into a fine‐grained material with
embedded aggregates. Similar stratum may be exposed in river‐right (south bank) cut banks
along the main stem of Unga Man Creek. More competent rock outcrops occur on the
mountain slopes in the north fork basin upstream of RM 2.1. These include what may be
basaltic formations (Photograph B‐14) or other volcanic rock outcroppings (Photographs B‐13,
B‐15 and B‐17).
D.4.3 Surficial Geology
Surficial geology in the project footprint is assumed to be predominately alluvium. The active
creek flood corridor exhibits abundant boulders, cobbles, and gravels. Fresh cut bank
exposures (Photographs B‐3, B‐6, and B‐7) along the creek corridor indicate that less disturbed
deposits on the valley floor may have a significant fraction of sand and silt.
Unga Man Creek Basin
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report D ‐ 7
Eight test borings to 20+ feet completed for the landfill road on the creeks’ alluvial fan revealed
subsurface conditions consisting of layers of silty sand, sand and gravels, and gravelly sands
with traces of silt, with numerous cobbles and boulders throughout.19
Test pits for the landfill development and for a formerly proposed wind turbine at the landfill
revealed similar subsurface conditions: layers of sandy silt, silty sand, sand, and silt, with gravel
and cobble inclusions. Some of the upper layers of silt could have been volcanic ash. 20
The relatively mild maritime climate in False Pass makes incidence of permafrost in the project
area unlikely.
D.4.3 Geotechnical Recommendations
The spatial extent and depth of the consolidated stratum observed around RM 1.8 on the south
fork within the project footprint is unknown. If it is present at shallow depth at the diversion
site, it may useful in facilitating cutoff of subsurface flow beneath the diversion structure.
Foundation design for project structures is likely to be similar if founded in this material or in
unconsolidated alluvium.
Test pits or borings are recommended to verify subsurface conditions throughout the project
footprint prior to final design and construction, with verification of subsurface conditions at the
powerhouse site and diversion site being the most important.
19 HDR 2007.
20 DMA 2004, Golder 2014.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
APPENDIX E – ENVIRONMENTAL CONSIDERATIONS
Section Title Page Nos.
E.1 EARLY AGENCY CONSULTATIONS .................................................................................2
E.2 WILDLIFE ..............................................................................................................3
E.3 FISHERIES ..............................................................................................................3
E.4 WATER AND AIR QUALITY............................................................................................4
E.5 WETLAND AND PROTECTED AREAS..............................................................................4
E.6 ARCHAEOLOGICAL AND HISTORICAL RESOURCES.........................................................4
E.7 LAND DEVELOPMENT CONSIDERATIONS......................................................................5
E.8 TELECOMMUNICATIONS AND AVIATION CONSIDERATIONS.........................................5
E.9 VISUAL AND AESTHETIC RESOURCES............................................................................5
E.10 MITIGATION MEASURES ..............................................................................................5
Attachment E‐1 IPaC Species List
Attachment E‐2 ADFG Meeting Records
‐ July 5, 2017 Conversation Record (ADFG Commercial Fish)
‐ July 5, 2017 Conversation Record (ADFG Sport Fish)
‐ July 7, 2017 Conversation Record (ADFG Habitat)
‐ September 19, 2017 Conversation Record (ADFG Habitat)
Attachment E‐3 Fisheries Survey Reports & Select Prior Hydro Study Reports
‐ 2015 False Pass Hydroelectric Potential Reconnaissance Report (LSD 2015)
‐ 2016 Feasibility Study Progress Report (LSD 2016)
‐ 2017 Unga Man Creek Fisheries Survey Field Report (LSD 2017)
City of False Pass
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June 2022 – Final Report E ‐ 1
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City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report E ‐ 2
E.1 EARLY AGENCY CONSULTATIONS
E.1.1 U.S. Fish and Wildlife Service ‐ Threatened and Endangered Species
The U.S. Fish and Wildlife Service and National Marine Fisheries Service were contacted using
the IPaC portal about this project.21 The project area is not listed as critical habitat for any
threatened, endangered, or candidate species.
There are no federal refuge lands or fish hatcheries within the proposed project footprint.
The Aleutian tern is a Bird of Conservation Concern that is expected to be present in the project
area. This species can be expected to be present during its breeding season, May 1 to August
31, with greatest probability of presence in late June.
Other protected species likely to occur in the project area include eagles and migratory birds.
E.1.2 Alaska Department of Fish and Game – Fish Habitat
Because the proposed project would partially dewater anadromous and resident fish habitat
within Unga Man Creek, Polarconsult consulted with ADFG at the beginning of the feasibility
study to scope out the resource studies and environmental restrictions that would apply to the
project to protect fish habitat.
Early In July 2017 Polarconsult and LSD consulted with personnel at ADFG’s Sport Fish and
Commercial Fish divisions to assess the functional importance of Unga Man Creek. Both
advised the creek is not considered to be a significant sport or commercial fish resource. We
also met with ADFG Habitat Division personnel to review fisheries survey design and overall
project goals and fish habitat questions.
Polarconsult and LSD again met with ADFG Habitat personnel in September 2017 to review field
findings. ADFG’s preliminary guidance for the project follows:
‐ The powerhouse and tailrace should be located near or above RM 0.55 to avoid impacts
to the productive habitat downstream of RM 0.55.
‐ Tributary flows from the east fork and other incremental flows along the bypass reach
may be adequate for habitat between RM 0.55 and RM 1.4. An in‐stream flow
reservation may be warranted depending on final hydrology study results.
‐ A coanda‐type intake screen is likely adequate for fish screening.
‐ Upstream fish passage provisions may not be necessary at the diversion structure
depending on final location.
These preliminary findings represent feedback from agency personnel at the time of
consultations in 2017, and are not binding upon ADFG. All of this guidance has been
21 USFWS 2022.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report E ‐ 3
incorporated into the proposed project layout and configuration. ADFG meeting records are
included as attachments to Appendix E.
E.2 WILDLIFE
The project does not significantly affect upland habitat areas, so no significant wildlife impacts
are expected.
Brown bears are abundant in the project area and personnel activities during construction and
operations should utilize best practices to avoid and manage human‐bear encounters.
E.3 FISHERIES
E.3.1 Anadromous Habitat
Unga Man Creek is listed by the ADFG as anadromous fish habitat for chum, pink, coho and
sockeye salmon.22 Field surveys completed in the summers of 2015, 2016, and 2017 for this
project by LSD characterized and quantified the presence, abundance, and habitat of
anadromous fish in the creek. Foot counts conducted in 2016 documented pinks, chum, and
sockeye salmon in Unga Man. Minnow trapping in August 2016 and August 2017 (RM 0.0 to
1.0) captured two coho fry and 132 resident Dolly Varden.
The creek is typical habitat for pink and chum, but is atypical habitat for either coho or sockeye.
The conclusion from available data is that the creek is important habitat for pink and chum but
presence of sockeye and coho represent stray individuals from other streams and the creek is
not important habitat for these species.23
Fisheries surveys confirmed pink salmon presence from tidewater up to natural barriers at RM
1.95 (north fork) and RM 1.85 (south fork). Foot survey of the full habitat reach on August 22‐
23, 2017 enumerated 6,679 pinks, 30 chum, and 3 sockeye. Pink densities above RM 0.55 were
about half those observed downstream of RM 0.55, but distribution was otherwise generally
uniform.
A total of 1,850 square meters (19,900 square feet) of potential spawning habitat was mapped
in the Unga Man basin from tidewater up to anadromous barriers during 2017 surveys. 82
percent of all spawning habitat in the system is located downstream of the False Pass Landfill
(below RM 0.3), and 93 percent of all habitat is located downstream of the road bridge (below
RM 0.55). The spawning habitat upstream of RM 0.55 is marginal due to shallow substrate
depth (generally about six inches) and prevailing unstable stream bed.
Field reports are included as attachments to Appendix E.
22 Unga Man Creek is listed in the Atlas and Catalog of Waters Important to the Spawning, Rearing, and
Migration of Anadromous Fishes, maintained by the Alaska Department of Fish and Game.
23 LSD 2015, LSD 2016, LSD 2017.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report E ‐ 4
E.3.2 Resident Habitat
Resident Dolly Varden are present throughout the proposed bypass reach of Unga Man Creek.
No additional compensation has been proposed or appears warranted for impacts to resident
Dolly Varden associated with this project.
Figure E‐1 Estimated Unga Man Creek Flow at RM 1.4 (Below Diversion Site)
E.4 WATER AND AIR QUALITY
The project will not negatively impact water or air quality. By reducing diesel combustion in
False Pass, the project will improve local air quality. By reducing the amount of fuel shipped to
False Pass for power generation, the project will also incrementally reduce the risk of fuel spills
that could degrade water quality.
E.5 WETLAND AND PROTECTED AREAS
The diversion and intake structures are by necessity located within the ordinary high water
mark of Unga Man Creek. The creek bed at the proposed diversion structure is coarse alluvium
consisting of boulders, cobbles, and gravels.
The access / penstock corridor passes near a wetland area but does not impact the wetland.
E.6 ARCHAEOLOGICAL AND HISTORICAL RESOURCES
No archeological or historical resources are known to exist in the project area. An archeological
survey has not been completed.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report E ‐ 5
E.7 LAND DEVELOPMENT CONSIDERATIONS
The proposed access road to the intake site will provide improved vehicular access up Unga
Man valley. The proposed power line route will extend electric service to the landfill and Unga
Man valley vicinity. These improvements would help to reduce the cost of developing these
lands in the future. Some of this land may be subject to flood hazards from Unga Man Creek.
No development proposals for these lands are known.
E.8 TELECOMMUNICATIONS AND AVIATION CONSIDERATIONS
The project will not affect telecommunications or aviation.
E.9 VISUAL AND AESTHETIC RESOURCES
The project will not be prominently visible from popular vantage points on the ground
surrounding False Pass. The only vantage point from which the project will generally be visible
is from the air.
E.10 MITIGATION MEASURES
Based on current information, this project is expected to impact no wetlands and impact waters
of the U.S. totaling less than ½ acre. No mitigation is expected to be necessary for this acreage
of impacts.
Based on preliminary guidance received from consultations with ADFG personnel, the project
layout has been tailored to avoid the most productive habitat along Unga Man Creek.
Specifically, the project powerhouse has been moved up stream 0.3 miles from prior layouts to
return water to RM 0.50, avoiding impacts to the productive habitat reach between this
location and tidewater.24
The project will reduce flow at the top of the bypass reach of Unga Man Creek by
approximately 85% during natural low flow periods (See Figure E‐1). Flow from the east fork
tributary will maintain approximately 15% of the natural flow in the creek at all times.
If required, mitigation options for these potential impacts could include a minimum ISFR for the
bypass reach of Unga Man Creek, construction of off‐site compensatory habitat to make up for
lost habitat in Unga Man Creek, or payment as mitigation as allowed in Alaska Statute
16.05.851. The economic impacts of potential mitigation measures warrants close scrutiny to
avoid undue burden on the project or community in the form of reduced project performance,
long‐term cost commitments, or other adverse outcomes.
24 For comparison, see earlier project layouts at Figure 13 of 2015 field report (LSD 2015) and Figure 21 of 2016
field report (LSD 2016).
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
ATTACHMENT E‐1
USFWS IPaC SPECIES LIST
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
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April 20, 2022
United States Department of the Interior
FISH AND WILDLIFE SERVICE
Anchorage Fish & Wildlife Field Office
4700 Blm Road
Anchorage, AK 99507
Phone: (907) 271-2888 Fax: (907) 271-2786
In Reply Refer To:
Project Code: 2022-0034126
Project Name: Unga Man Creek Hydro
Subject:List of threatened and endangered species that may occur in your proposed project
location or may be affected by your proposed project
To Whom It May Concern:
The enclosed species list identifies threatened, endangered, and proposed species, designated
critical habitat, and some candidate species that may occur within the boundary of your proposed
project and/or may be affected by your proposed project. The species list fulfills the requirements
of the U.S. Fish and Wildlife Service (Service) under section 7(c) of the Endangered Species Act
(Act) of 1973, as amended (16 U.S.C. 1531 et seq.). Please note that candidate species are not
included on this list. We encourage you to visit the following website to learn more about
candidate species in your area:
http://www.fws.gov/alaska/fisheries/fieldoffice/anchorage/endangered/
candidate_conservation.htm
New information based on updated surveys, changes in the abundance and distribution of
species, changed habitat conditions, or other factors could change this list. Please feel free to
contact us if you need more current information or assistance regarding the potential impacts to
federally proposed, listed, and candidate species and federally designated and proposed critical
habitat. Please note that under 50 CFR 402.12(e) of the regulations implementing section 7 of the
Act, the accuracy of this species list should be verified after 90 days. This verification can be
completed formally or informally as desired. The Service recommends that verification be
completed by visiting the ECOS-IPaC website at regular intervals during project planning and
implementation for updates to species lists and information. An updated list may be requested
through the ECOS-IPaC system by completing the same process used to receive the enclosed list.
Endangered Species: The purpose of the Act is to provide a means whereby threatened and
endangered species and the ecosystems upon which they depend may be conserved. Under
sections 7(a)(1) and 7(a)(2) of the Act and its implementing regulations (50 CFR 402 et seq.),
Federal agencies are required to utilize their authorities to carry out programs for the
conservation of threatened and endangered species and to determine whether projects may affect
04/20/2022 2
threatened and endangered species and/or designated critical habitat.
A Biological Assessment is required for construction projects (or other undertakings having
similar physical impacts) that are major Federal actions significantly affecting the quality of the
human environment as defined in the National Environmental Policy Act (42 U.S.C. 4332(2)
(c)). For projects other than major construction activities, the Service suggests that a biological
evaluation similar to a Biological Assessment be prepared to determine whether the project may
affect listed or proposed species and/or designated or proposed critical habitat. Recommended
contents of a Biological Assessment are described at 50 CFR 402.12.
If a Federal agency determines, based on the Biological Assessment or biological evaluation, that
listed species and/or designated critical habitat may be affected by the proposed project, the
agency is required to consult with the Service pursuant to 50 CFR 402. In addition, the Service
recommends that candidate species, proposed species and proposed critical habitat be addressed
within the consultation. More information on the regulations and procedures for section 7
consultation, including the role of permit or license applicants, can be found in the "Endangered
Species Consultation Handbook" at:
http://www.fws.gov/endangered/esa-library/pdf/TOC-GLOS.PDF
Migratory Birds: In addition to responsibilities to protect threatened and endangered species
under the Endangered Species Act (ESA), there are additional responsibilities under the
Migratory Bird Treaty Act (MBTA) and the Bald and Golden Eagle Protection Act (BGEPA) to
protect native birds from project-related impacts. Any activity, intentional or unintentional,
resulting in take of migratory birds, including eagles, is prohibited unless otherwise permitted by
the U.S. Fish and Wildlife Service (50 C.F.R. Sec. 10.12 and 16 U.S.C. Sec. 668(a)). For more
information regarding these Acts see:
https://www.fws.gov/birds/policies-and-regulations.php
The MBTA has no provision for allowing take of migratory birds that may be unintentionally
killed or injured by otherwise lawful activities. It is the responsibility of the project proponent to
comply with these Acts by identifying potential impacts to migratory birds and eagles within
applicable NEPA documents (when there is a Federal nexus) or a Bird/Eagle Conservation Plan
(when there is no Federal nexus). Proponents should implement conservation measures to avoid
or minimize the production of project-related stressors or minimize the exposure of birds and
their resources to the project-related stressors. For more information on avian stressors and
recommended conservation measures see:
https://www.fws.gov/birds/bird-enthusiasts/threats-to-birds.php
In addition to MBTA and BGEPA, Executive Order 13186: Responsibilities of Federal Agencies
to Protect Migratory Birds, obligates all Federal agencies that engage in or authorize activities
that might affect migratory birds, to minimize those effects and encourage conservation measures
that will improve bird populations. Executive Order 13186 provides for the protection of both
04/20/2022 3
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migratory birds and migratory bird habitat. For information regarding the implementation of
Executive Order 13186, please visit https://www.fws.gov/birds/policies-and-regulations/
executive-orders/e0-13186.php.
Please be aware that bald and golden eagles are protected under the Bald and Golden Eagle
Protection Act (16 U.S.C. 668 et seq.), and projects affecting these species may require
development of an eagle conservation plan (http://www.fws.gov/windenergy/
eagle_guidance.html). Additionally, wind energy projects should follow the wind energy
guidelines (http://www.fws.gov/windenergy/) for minimizing impacts to migratory birds and
bats.
Guidance for minimizing impacts to migratory birds for projects including communications
towers (e.g., cellular, digital television, radio, and emergency broadcast) can be found at:
http://www.fws.gov/migratorybirds/CurrentBirdIssues/Hazards/towers/towers.htm
http://www.towerkill.com
http://www.fws.gov/migratorybirds/CurrentBirdIssues/Hazards/towers/comtow.html
We appreciate your concern for threatened and endangered species. The Service encourages
Federal agencies to include conservation of threatened and endangered species into their project
planning to further the purposes of the Act. Please include the Consultation Tracking Number in
the header of this letter with any request for consultation or correspondence about your project
that you submit to our office.
Attachment(s):
Official Species List
USFWS National Wildlife Refuges and Fish Hatcheries
Migratory Birds
04/20/2022 1
Official Species List
This list is provided pursuant to Section 7 of the Endangered Species Act, and fulfills the
requirement for Federal agencies to "request of the Secretary of the Interior information whether
any species which is listed or proposed to be listed may be present in the area of a proposed
action".
This species list is provided by:
Anchorage Fish & Wildlife Field Office
4700 Blm Road
Anchorage, AK 99507
(907) 271-2888
04/20/2022 2
Project Summary
Project Code:2022-0034126
Event Code:None
Project Name:Unga Man Creek Hydro
Project Type:Power Gen - Hydropower - Non-FERC
Project Description:Feasibility stage, studying a Run of River hydro on Unga Man Creek from
RM 1.42 to RM 0.55.
Project Location:
Approximate location of the project can be viewed in Google Maps: https://
www.google.com/maps/@54.8722114,-163.42659056335506,14z
Counties:Aleutians East County, Alaska
04/20/2022 3
1.
Endangered Species Act Species
There is a total of 0 threatened, endangered, or candidate species on this species list.
Species on this list should be considered in an effects analysis for your project and could include
species that exist in another geographic area. For example, certain fish may appear on the species
list because a project could affect downstream species.
IPaC does not display listed species or critical habitats under the sole jurisdiction of NOAA
Fisheries , as USFWS does not have the authority to speak on behalf of NOAA and the
Department of Commerce.
See the "Critical habitats" section below for those critical habitats that lie wholly or partially
within your project area under this office's jurisdiction. Please contact the designated FWS office
if you have questions.
NOAA Fisheries, also known as the National Marine Fisheries Service (NMFS), is an
office of the National Oceanic and Atmospheric Administration within the Department of
Commerce.
Critical habitats
THERE ARE NO CRITICAL HABITATS WITHIN YOUR PROJECT AREA UNDER THIS OFFICE'S
JURISDICTION.
1
04/20/2022 1
USFWS National Wildlife Refuge Lands And Fish
Hatcheries
Any activity proposed on lands managed by the National Wildlife Refuge system must undergo a
'Compatibility Determination' conducted by the Refuge. Please contact the individual Refuges to
discuss any questions or concerns.
THERE ARE NO REFUGE LANDS OR FISH HATCHERIES WITHIN YOUR PROJECT AREA.
04/20/2022 1
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Migratory Birds
Certain birds are protected under the Migratory Bird Treaty Act and the Bald and Golden Eagle
Protection Act .
Any person or organization who plans or conducts activities that may result in impacts to
migratory birds, eagles, and their habitats should follow appropriate regulations and consider
implementing appropriate conservation measures, as described below.
The Migratory Birds Treaty Act of 1918.
The Bald and Golden Eagle Protection Act of 1940.
50 C.F.R. Sec. 10.12 and 16 U.S.C. Sec. 668(a)
The birds listed below are birds of particular concern either because they occur on the USFWS
Birds of Conservation Concern (BCC) list or warrant special attention in your project location.
To learn more about the levels of concern for birds on your list and how this list is generated, see
the FAQ below. This is not a list of every bird you may find in this location, nor a guarantee that
every bird on this list will be found in your project area. To see exact locations of where birders
and the general public have sighted birds in and around your project area, visit the E-bird data
mapping tool (Tip: enter your location, desired date range and a species on your list). For
projects that occur off the Atlantic Coast, additional maps and models detailing the relative
occurrence and abundance of bird species on your list are available. Links to additional
information about Atlantic Coast birds, and other important information about your migratory
bird list, including how to properly interpret and use your migratory bird report, can be found
below.
For guidance on when to schedule activities or implement avoidance and minimization measures
to reduce impacts to migratory birds on your list, click on the PROBABILITY OF PRESENCE
SUMMARY at the top of your list to see when these birds are most likely to be present and
breeding in your project area.
NAME BREEDING SEASON
Aleutian Tern Sterna aleutica
This is a Bird of Conservation Concern (BCC) throughout its range in the
continental USA and Alaska.
https://ecos.fws.gov/ecp/species/9599
Breeds May 1 to Aug 31
Probability Of Presence Summary
The graphs below provide our best understanding of when birds of concern are most likely to be
present in your project area. This information can be used to tailor and schedule your project
activities to avoid or minimize impacts to birds. Please make sure you read and understand the
FAQ "Proper Interpretation and Use of Your Migratory Bird Report" before using or attempting
to interpret this report.
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04/20/2022 2
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no data survey effort breeding season probability of presence
Probability of Presence ()
Each green bar represents the bird's relative probability of presence in the 10km grid cell(s) your
project overlaps during a particular week of the year. (A year is represented as 12 4-week
months.) A taller bar indicates a higher probability of species presence. The survey effort (see
below) can be used to establish a level of confidence in the presence score. One can have higher
confidence in the presence score if the corresponding survey effort is also high.
How is the probability of presence score calculated? The calculation is done in three steps:
The probability of presence for each week is calculated as the number of survey events in
the week where the species was detected divided by the total number of survey events for
that week. For example, if in week 12 there were 20 survey events and the Spotted Towhee
was found in 5 of them, the probability of presence of the Spotted Towhee in week 12 is
0.25.
To properly present the pattern of presence across the year, the relative probability of
presence is calculated. This is the probability of presence divided by the maximum
probability of presence across all weeks. For example, imagine the probability of presence
in week 20 for the Spotted Towhee is 0.05, and that the probability of presence at week 12
(0.25) is the maximum of any week of the year. The relative probability of presence on
week 12 is 0.25/0.25 = 1; at week 20 it is 0.05/0.25 = 0.2.
The relative probability of presence calculated in the previous step undergoes a statistical
conversion so that all possible values fall between 0 and 10, inclusive. This is the
probability of presence score.
Breeding Season ()
Yellow bars denote a very liberal estimate of the time-frame inside which the bird breeds across
its entire range. If there are no yellow bars shown for a bird, it does not breed in your project
area.
Survey Effort ()
Vertical black lines superimposed on probability of presence bars indicate the number of surveys
performed for that species in the 10km grid cell(s) your project area overlaps. The number of
surveys is expressed as a range, for example, 33 to 64 surveys.
No Data ()
A week is marked as having no data if there were no survey events for that week.
Survey Timeframe
Surveys from only the last 10 years are used in order to ensure delivery of currently relevant
information. The exception to this is areas off the Atlantic coast, where bird returns are based on
all years of available data, since data in these areas is currently much more sparse.
04/20/2022 3
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SPECIES JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Aleutian Tern
BCC Rangewide
(CON)
Additional information can be found using the following links:
Birds of Conservation Concern https://www.fws.gov/program/migratory-birds/species
Measures for avoiding and minimizing impacts to birds https://www.fws.gov/library/
collections/avoiding-and-minimizing-incidental-take-migratory-birds
Nationwide conservation measures for birds https://www.fws.gov/sites/default/files/
documents/nationwide-standard-conservation-measures.pdf
Migratory Birds FAQ
Tell me more about conservation measures I can implement to avoid or minimize impacts
to migratory birds.
Nationwide Conservation Measures describes measures that can help avoid and minimize
impacts to all birds at any location year round. Implementation of these measures is particularly
important when birds are most likely to occur in the project area. When birds may be breeding in
the area, identifying the locations of any active nests and avoiding their destruction is a very
helpful impact minimization measure. To see when birds are most likely to occur and be breeding
in your project area, view the Probability of Presence Summary. Additional measures or permits
may be advisable depending on the type of activity you are conducting and the type of
infrastructure or bird species present on your project site.
What does IPaC use to generate the migratory birds potentially occurring in my specified
location?
The Migratory Bird Resource List is comprised of USFWS Birds of Conservation Concern
(BCC) and other species that may warrant special attention in your project location.
The migratory bird list generated for your project is derived from data provided by the Avian
Knowledge Network (AKN). The AKN data is based on a growing collection of survey, banding,
and citizen science datasets and is queried and filtered to return a list of those birds reported as
occurring in the 10km grid cell(s) which your project intersects, and that have been identified as
warranting special attention because they are a BCC species in that area, an eagle (Eagle Act
requirements may apply), or a species that has a particular vulnerability to offshore activities or
development.
Again, the Migratory Bird Resource list includes only a subset of birds that may occur in your
project area. It is not representative of all birds that may occur in your project area. To get a list
of all birds potentially present in your project area, please visit the AKN Phenology Tool.
What does IPaC use to generate the probability of presence graphs for the migratory birds
potentially occurring in my specified location?
04/20/2022 4
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The probability of presence graphs associated with your migratory bird list are based on data
provided by the Avian Knowledge Network (AKN). This data is derived from a growing
collection of survey, banding, and citizen science datasets .
Probability of presence data is continuously being updated as new and better information
becomes available. To learn more about how the probability of presence graphs are produced and
how to interpret them, go the Probability of Presence Summary and then click on the "Tell me
about these graphs" link.
How do I know if a bird is breeding, wintering, migrating or present year-round in my
project area?
To see what part of a particular bird's range your project area falls within (i.e. breeding,
wintering, migrating or year-round), you may refer to the following resources: The Cornell Lab
of Ornithology All About Birds Bird Guide, or (if you are unsuccessful in locating the bird of
interest there), the Cornell Lab of Ornithology Neotropical Birds guide. If a bird on your
migratory bird species list has a breeding season associated with it, if that bird does occur in your
project area, there may be nests present at some point within the timeframe specified. If "Breeds
elsewhere" is indicated, then the bird likely does not breed in your project area.
What are the levels of concern for migratory birds?
Migratory birds delivered through IPaC fall into the following distinct categories of concern:
"BCC Rangewide" birds are Birds of Conservation Concern (BCC) that are of concern
throughout their range anywhere within the USA (including Hawaii, the Pacific Islands,
Puerto Rico, and the Virgin Islands);
"BCC - BCR" birds are BCCs that are of concern only in particular Bird Conservation
Regions (BCRs) in the continental USA; and
"Non-BCC - Vulnerable" birds are not BCC species in your project area, but appear on
your list either because of the Eagle Act requirements (for eagles) or (for non-eagles)
potential susceptibilities in offshore areas from certain types of development or activities
(e.g. offshore energy development or longline fishing).
Although it is important to try to avoid and minimize impacts to all birds, efforts should be made,
in particular, to avoid and minimize impacts to the birds on this list, especially eagles and BCC
species of rangewide concern. For more information on conservation measures you can
implement to help avoid and minimize migratory bird impacts and requirements for eagles,
please see the FAQs for these topics.
Details about birds that are potentially affected by offshore projects
For additional details about the relative occurrence and abundance of both individual bird species
and groups of bird species within your project area off the Atlantic Coast, please visit the
Northeast Ocean Data Portal. The Portal also offers data and information about other taxa besides
birds that may be helpful to you in your project review. Alternately, you may download the bird
model results files underlying the portal maps through the NOAA NCCOS Integrative Statistical
Modeling and Predictive Mapping of Marine Bird Distributions and Abundance on the Atlantic
Outer Continental Shelf project webpage.
04/20/2022 5
Bird tracking data can also provide additional details about occurrence and habitat use
throughout the year, including migration. Models relying on survey data may not include this
information. For additional information on marine bird tracking data, see the Diving Bird Study
and the nanotag studies or contact Caleb Spiegel or Pam Loring.
What if I have eagles on my list?
If your project has the potential to disturb or kill eagles, you may need to obtain a permit to avoid
violating the Eagle Act should such impacts occur.
Proper Interpretation and Use of Your Migratory Bird Report
The migratory bird list generated is not a list of all birds in your project area, only a subset of
birds of priority concern. To learn more about how your list is generated, and see options for
identifying what other birds may be in your project area, please see the FAQ "What does IPaC
use to generate the migratory birds potentially occurring in my specified location". Please be
aware this report provides the "probability of presence" of birds within the 10 km grid cell(s) that
overlap your project; not your exact project footprint. On the graphs provided, please also look
carefully at the survey effort (indicated by the black vertical bar) and for the existence of the "no
data" indicator (a red horizontal bar). A high survey effort is the key component. If the survey
effort is high, then the probability of presence score can be viewed as more dependable. In
contrast, a low survey effort bar or no data bar means a lack of data and, therefore, a lack of
certainty about presence of the species. This list is not perfect; it is simply a starting point for
identifying what birds of concern have the potential to be in your project area, when they might
be there, and if they might be breeding (which means nests might be present). The list helps you
know what to look for to confirm presence, and helps guide you in knowing when to implement
conservation measures to avoid or minimize potential impacts from your project activities,
should presence be confirmed. To learn more about conservation measures, visit the FAQ "Tell
me about conservation measures I can implement to avoid or minimize impacts to migratory
birds" at the bottom of your migratory bird trust resources page.
04/20/2022 6
IPaC User Contact Information
Agency:False Pass city
Name:Joel Groves
Address:1503 West 33rd Avenue #310
City:Anchorage
State:AK
Zip:99503
Email joel@polarconsult.net
Phone:9072582420
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
ATTACHMENT E‐2
POLARCONSULT MEETING RECORDS WITH ADFG
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
This page intentionally blank.
polarconsult alaska, inc.
ENGINEERS - PLANNERS - ENERGY CONSULTANTS
specializing in energy conservation systems
CONVERSATION RECORD
DATE: PROJECT: TIME:
July 5, 2017 16003 2:30 PM
CONTACT: COMPANY:
Tyler Polum Adfg-Sf
PHONE#: FAX#: Taken By:
907-486-1879 Joel Groves
SUBJECT:
Consultation on Ungaman Creek Hydro
SUMMARY:
Initial contact was to Michelle Stratton (486-1868), she directed me to Tyler.
I provided brief introduction to myself and proposed project. Tyler is area mgmt
biologist for sport fish. Only vaguely familiar with Ungaman Creek.
He said there is not any sport fish resourse utilization there that he is aware of, this
resource is not on their radar. He did not know about commercial or subsistence uses.
Referred me to comm. fish area biologist, Elisabeth (Lisa) Fox in Sand Point who can
speak to the comm. fish resource and may be more familiar with the creek.
polarconsult alaska, inc.
ENGINEERS - PLANNERS - ENERGY CONSULTANTS
specializing in energy conservation systems
CONVERSATION RECORD
DATE: PROJECT: TIME:
July 5, 2017 16003 2:30 PM
CONTACT: COMPANY:
Lisa Fox Adfg-Cf
PHONE#: FAX#: Taken By:
907-383-2066 Joel Groves
SUBJECT:
Consultation on Ungaman Creek Hydro
SUMMARY:
Provided brief introduction to myself and proposed project. Lisa is comm. fish area
biologist and familiar with Ungaman Creek. She was just in False Pass last week (just on
the ground at airport) but think she did a foot survey downstream of bridge in 2016.
She said it is not a major resource for the region from a comm. fish perspective. She did
not know about sport or subsistence uses. She said she would include the creek in her
aerial survey work this summer once the salmon season picks up.
Told her I would forward the 2016 feasbility progress report to provide her info on the
project and proposed footprint / bypass reach. Emailed on 7/6/2017.
polarconsult alaska, inc.
ENGINEERS - PLANNERS - ENERGY CONSULTANTS
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CONVERSATION RECORD
DATE: PROJECT: TIME:
7/7/2017 16003 Ungaman Feas 3:30 PM
CONTACT: COMPANY:
Jeanette Alas Adfg Habitat
PHONE#: FAX#: Taken By:
267-2805 Joel Groves
SUBJECT:
Unga Man Creek Hydro, preliminary consultations
SUMMARY:
Called Megan Marie, head of southcentral habitat office, she referred me to Jeanette Alas.
Provided Jeanette brief overview of project and our goals in early consultation. She is
familiar with project generally and has communicated with Bob in the past.
Agreed to meet week of 7/10 to review project and consultation requests.
polarconsult alaska, inc.
ENGINEERS - PLANNERS - ENERGY CONSULTANTS
specializing in energy conservation systems
CONVERSATION RECORD
DATE: PROJECT: TIME:
July 13, 2017 16003 10:00 AM
CONTACT: COMPANY:
Jeanette Alas Adfg-Habitat
PHONE#: FAX#: Taken By:
Joel Groves
SUBJECT:
Early Consultation, Unga Man Creek Hydro False Pass AK
SUMMARY:
JG met w/ Jeanette Alas (JA) (Habitat adjudocator) and Kevin Keith (KK) (new FERC
lead at ADFG). Bob Christensen (BC) on phone.
JG provided brief overview of project, current status and general discussion of issues that
will guide final project size and layout. Touched on what we are seeking from ADFG at
this point in time. Also had provided feas progress report and meeting goals via email
prior to meeting.
Jeanette mentioned that AWC upstream limit of anadromy was input to the Atlas wrong
and they haven’t corrected it yet. She said it is a point on the N. Fork above the
confluence.
Fishery study requests for this year (JA):
1. Minnow trapping in upper reach as proposed. This data is not hugely useful but still
good to have. Will help characterize what the coho utilization of the resource is.
Existing data (2 JV fish) suggests JV are just strays from adjacent streams. Maybe from
strayed adults in system that spawned, but either way not significant. Additional data
would help confirm this. Expect will find DV upstream to start of extreme alpine.
2. Foot surveys. Continue frequency / timing. Foot surveys are very useful to understand
fish presence and distribution. JA requested to split tallies from existing single reach
aggregate (bridge to major fork) into 4-5 smaller reaches in this reach to help better
understand fish distribution. BC will coordinate this with Chris Stewart.
3. Habitat mapping. Proceed as proposed, foot survey to assess w/ drone imagery for
ADFG review. Will help to confirm no significant spawning in upper basin.
Preliminary permit guidance:
1. JG described coanda-type intake structure. JA confirmed this sounded acceptable. JG
said would provide guidance on fish compatibility with screens.
2. PH / tailrace as shown is well into spawning habitat near tidewater. Suggested move
PH upstream closer to RM 0.5 or so. JG said can review and address. Concern about
protecting PH from creek meanders. Some head loss but believe can be accommodated.
polarconsult alaska, inc.
ENGINEERS - PLANNERS - ENERGY CONSULTANTS
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3. Intake. Using east fork for habitat flow in the bypass reach would be acceptable, or
ISFR if not. ISFR amount depends on hydrology.
4. adult admittance upstream through intake structure not required based on current
information. If anadromous spawning exists above intake (existing data suggests it does
not), adult passage may be a requirement.
General discussion:
1. Any evidence of anadromous / sea run DV? Bob said no. All DV appear to be JV or
mature resident. We can ask Chris if he has seen any big DV in system.
2. JG asked about guidance on restrictions on construction timing. Jeanette said tailrace
work should target, generally, mid-May to mid July when there are no salmon using the
system. Intake work should avoid spawning season, July – September. Main concern
there is increased sediment impacting spawning gravels, can also deal w/ this with
SWPPP controls.
3. JA asked about timing of rock exploration. JG said dependent on study progress and
funding, earliest would be 2018. Clarified rock exposures indicate rock is weak from
engineering perspective, and probably more useful as a low-ermeability water cut-off at
the intake site than as a foundation material. Assuming intake will be founded in creek
alluvium below scour.
4. Hydrology. JG discussed challenge of hydrology at remote sites, described data to
date. Only correlation candidate is Russell Creek, trial correlation is not great, but OK.
Intend to continue collecting data until development, so long as project is still being
actively pursued. Need hydrology to understand resource so we know what to build, in
addition to habitat needs.
5. FERC jurisdiction and permitting. Kevin concurred project is not jurisdictional. JG
confirmed at outset of permitting process would file DI to confirm non-jurisdiction.
Major permits include ADNR water rights, ADFG fish habitat permit, DOA
wetland/waters of U.S. permit. Other permits such as SWPPP etc also… JA asked about
water rights sequencing, mentioned their backlog. JG said first step is water rights
application and supporting documentation. Adjudicating that request is the backlog.
Once processed, they issue water use permit for 5 years, project has to report water usage
data and that usage record forms the basis for water rights. ADNR will look to ADFG for
any ISFR that needs to be put into the water rights. ISFR is entered directly into water
rights, not referenced.
Action Items:
1. BC to provide foot count spreadsheet.
2. BC to coordinate with Chris Stewart on dividing foot counts into 4-5 reaches.
3. JG to provide hydrology data.
4. JG to provide info on coanda intakes.
5. review PH location, move upstream to ~RM 0.5 to stay above spawning habitat.
polarconsult alaska, inc.
ENGINEERS - PLANNERS - ENERGY CONSULTANTS
specializing in energy conservation systems
CONVERSATION RECORD
DATE: PROJECT: TIME:
September 19, 2017 16003 10:45 AM
CONTACT: COMPANY:
Jeanette Alas Adfg
PHONE#: FAX#: Taken By:
267-2805 Joel Groves
SUBJECT:
Update
SUMMARY:
Jeanette has only skimmed Bob’s report. Not surprised by # of pinks seen as it is a big
pink year. She flew the creek in 2015, also big pink year, and saw lots of fish.
She reaffirmed that the key habitat is below the bridge, and wanted to confirm the PH
would be moved above that area. Area between the bridge and confluence is of lesser
value but still important, so will need to evaluate impacts to that and flow requirement
therein. Possible ISFR or flow from other forks would suffice.
Told her that hydrology was shaping up, have not looked at updated project layouts yet.
That is next up on my to do list. She is busy until early October, so scheduling should
work out well.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
ATTACHMENT E‐3
FISHERIES SURVEY REPORTS
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
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aLiving Systems DesignFalse Pass Hydro Recon: 20150910
False Pass Hydroelectric Potential
2015 Reconnaissance Report
Prepared for the City of False Pass & APICDA
by: Bob Christensen
20150910
Cover 2. Newly installed stream gage at Unga Man Creek bridge
Cover 1. Unga Man Creek seen from north valley Wall
iLiving Systems DesignFalse Pass Hydro Recon: 20150910
List of Figures .......................................................................................................ii
Background ..........................................................................................................1
Introduction ......................................................................................................................................................1
False Pass, Alaska .............................................................................................................................................1
Current Electrical Generation ......................................................................................................................1
Previous Reports .............................................................................................................................................2
Field Reconnaisance Site Selection ...........................................................................................................2
Waterfall Creek ....................................................................................................3
Location & Land Status..................................................................................................................................3
Geology ..............................................................................................................................................................3
Hydrology ..........................................................................................................................................................3
Fish & Wildlife ...................................................................................................................................................3
Waterfall Creek Summary .............................................................................................................................4
Unga Man Creek...................................................................................................4
Location & Land Status..................................................................................................................................4
Geology ..............................................................................................................................................................4
Hydrology ..........................................................................................................................................................4
Fish & Wildlife ...................................................................................................................................................5
Unga Man Creek Summary ..........................................................................................................................6
Preliminary Design ..............................................................................................6
Overview ............................................................................................................................................................6
Access ..................................................................................................................................................................6
Intake Site and Penstock ...............................................................................................................................7
Powerhouse Site ..............................................................................................................................................7
Transmission .....................................................................................................................................................7
Cost Estimate ....................................................................................................................................................8
Economic Analysis ..........................................................................................................................................8
Conclusion ............................................................................................................8
Summary ............................................................................................................................................................8
Recommendations .........................................................................................................................................8
TABLE OF CONTENTS
iiLiving Systems DesignFalse Pass Hydro Recon: 20150910
Cover 1. Unga Man Creek seen from north valley Wall ......................................................................a
Cover 2. Newly installed stream gage at Unga Man Creek bridge .................................................a
Figure 1. The community of False Palse Global Location Map ........................................................1
Figure 2. Google Earth view of the False Pass Village .........................................................................1
Figure 3. General land status near False Pass, AK. ................................................................................2
Figure 4. False Pass area geology. ..............................................................................................................3
Figure 5. Waterfall Creek seen from Drone at 255’ ..............................................................................3
Figure 6. Small cascade and pool in Waterfall Creek ..........................................................................3
Figure 7. View of Unga Man Creek fromr Drone at 204’ ....................................................................4
Figure 8. View of Unga Man Creek relationship to APICDA fish processing plant ....................4
Figure 9. Stream gage installed near bridge over Unga Man Creek ..............................................5
Figure 10. Stream gage installation locations. .......................................................................................5
Figure 11. Minnow trapping just downstream of the bridge ...........................................................5
Figure 12. Panorama of Unga Man Creek ...............................................................................................6
Figure 13. Preliminary design ......................................................................................................................7
Figure 14. Cost estimate table from Polar Consult Memo .................................................................8
Figure 15. Training City of False Pass Staff ...............................................................................................8
LIST OF FIGURES
Page 1Living Systems DesignFalse Pass Hydro Recon: 20150910
BACKGROUND
INTRODUCTION
Living Systems Design was contracted by the City of False Pass and APICDA to install stream gages
and develop a reconnaisance report for hydro-power options near False Pass, Alaska. A field trip
that included City and APICDA staff was conducted August 24-28 to survey two potential hydro-
power sites and install stream gages in the locations that appeared most feasible for Hydro-power
development. This report summarizes information gathered during this field trip along with addi-
tional research conducted for baseline reconnaisance.
FALSE PASS, ALASKA
The community of False Pass is located at the east-
ern edge of the Aleutian island chain (54°49′40″N
163°23′57″W), just across Isanotski Strait from
the Alaskan Peninsula. It is an isolated coastal
village that is only accessible by boat and plane
(primarily through Cold Bay).
The landscape surrounding the community is
mountainous and spectacular in its beauty with
the Bering Sea to the North and the Gulf of Alaska
to the South. The climate is sub-polar maritime
with cool summers and relatively mild winters.
Annual precipitation averages around 30 inches
with 3-5 feet of snow in the winter. Wind and fog
are common. Sea ice has been known to extend
into the area in colder winters.
There are approximately 50 year round residents who live in False Pass. Most residents participate
in the commercial and subsistence fishing economies to some degree. These folks are joined in
the summer months by approximately 60 part-time residents who are employed at the APICDA
fish processing plant. Other employment opportunities include local government, the school and a
variety of services.
CURRENT ELECTRICAL GENERATION
Electricy is currently provided by diesel genera-
tors (65kW, 90 kW and 150 kW units available
depending on load). The village load averages
around 65kW. Bering Sea fish processing plant
produces their own power through diesel gen-
eration as well and their loads average 75kW.
Energy costs in the village are relatively high,
averaging 71 cents per kWh over the past 5
years. This extremely high rate is typical of ru-
ral Alaskan communities whose primary source
of electricity is diesel generation. The City has
opted to ease the impact of high electric rates on
its residents by providing an annual subsidy of
approximately $150,000 dollars to reduce the cost of diesel used by the power plant. This subsidy
reduces rates to arround 42 cents per kWh but limits the communities ability to invest these funds
in beneficial capital improvements and social services. Power Cost Equalization (PCE) subsidizes an
additional 13 cents per kWh for a final cost to residents of approximately 28 cents per kWh.
Figure 1. The community of False Palse is located on
Unimak island, the very first in the Aleutian chain.
Figure 2. Google Earth view of the False Pass Village.
Airport Village
Harbor
Fish
Plant
Roundtop Mt.
Unga Man
Valley
Ferry
Dock
Page 2Living Systems DesignFalse Pass Hydro Recon: 20150910
PREVIOUS REPORTS
The community of False Pass has been actively seeking alternative energy solutions to provide
greater energy security to the community and reduce the costs of energy to its residents and
businesses. Hydo-power has been noted in most of the reports as potentially feasible. Both wind
and tidal have also been looked at and have provided mixed results in terms of feasibility thus far.
Four reports were reviewed as part of this reconaissance effort:
• A report was written in 1982 that described hydroelectric generation opportunities near False
Pass as not economically feasible. This is not surprising given that the cost of diesel at that
time was a little over one dollar per gallon. (Reconnaissance Study of Energy Requirements
and Alternatives, 1982)
• A more in depth report from 2010 (Herinafter “The Baker report”) looked at a number of
communities in the area and summarized options for wind, tidal and hydro in False Pass.
Recommendations from this report were to prioritize wind and hydro first because these
technologies are more mature and straight forward in terms of operation and maintenance.
For hydro, two creeks were looked at: Unga Man Creek and Waterfall Creek. Both sites
were noted by the authors as worth further investigation with an emphasis on establishing
an annual record of flow to determine economic feasibility. (Renewable Energy Resource
Assessment for the Communities of Cold Bay, False Pass, and Nelson Lagoon, 2014)
• A memo to AEA dated February 17, 2015 was reviewed that looked at two design options in the
Unga Man Creek watershed. The author used gaging data from Russel Creek in nearby Cold
Bay to estimate energy availability for two Unga Man Creek options at capable of providing
140-150kW. It was recommended to develop a flow record and assess aquatic habitat for this
system as the next logical step in reconnaisance. (False Pass Hydro Review, February 2015).
• An initial study of wind energy was reported on in July of 2015. This report confirmed
observations in previous reconaissance work on wind power for False Pass and concluded
that the wind resource is difficult to exploit
because of local turbulence.(False Pass Wind
Energy Feasibility Report, 2015).
FIELD RECONNAISANCE SITE SELECTION
The reports noted above identified a number of lo-
cations for Hydro-power potential near False Pass.
Two of the sites mentioned are located within the
Aleutians Peninsula National Wildlife Refuge. Based
on desk mapping exerises, these sites did not ap-
pear to offer unique power potential and were con-
sidered lower priority options because of the dif-
ficulty expected in obtaining permits necessary for
construction and operation.
Two of the sites noted in previous reports exist on
False Pass Village Corporation land (Isanotski Cor-
poration): Waterfall Creek and Unga Man Creek.
The Isanotski Corporation has expressed interest
in developing power production resources in the
past. Neither of these streams are currently listed
as anadromous in the ADFG Anadromous Waters
Catalog (AWC).
Given these baseline conditions we chose to focus
our reconnaissance field surveys on Waterfall and
Unga Man Creeks.Figure 3. General land status near False Pass, AK.
Page 3Living Systems DesignFalse Pass Hydro Recon: 20150910
WATERFALL CREEK
LOCATION & LAND STATUS
Waterfall Creek cascades to saltwater just .66
miles south of the False Pass airport. The land is
owned by the Isanotski Corporation. The lower
sections of the creek are easily accessible via a
short walk down the beach (at low tide) from the
end of the False Pass airport.
GEOLOGY
Like most of the area surrounding False Pass,
Waterfall Creek basin is mapped as Qtv, Volca-
nics (see figure 4). Unlike most nearby basins,
the Waterfall Creek basin appears to be primarily
bedrock in composition. Small patches of gravel
were noted in a few pool tails in the mainly bed-
rock control channel type.
HYDROLOGY
Waterfall Creek has a basin area of approximate-
ly .26 square miles that draws from a peak el-
evation of 1,000 feet. A field investigation of Wa-
terfall Creek conducted in support of the Baker
report used the bucket method to record a dis-
charge in January 2010 of .67 cfs. Our field crew
also used the bucket method and recorded a flow
of approximately .29 cfs on 20150924. Based on
the the complete lack of snow pack available to
provide runoff during our field investigation it ap-
pears likely that Waterfall Creek is at least par-
tially spring-fed.
FISH & WILDLIFE
Waterfall Creek is not mapped as an anadromous
stream in the AWC. Our site survey confirmed a
barrier to fish passage (the falls) is a certainty at
the intertidal zone. It is possible that the stream
contains resident fish but we did not trap the
stream to make a determiniation. Our foot sur-
veys found spawning substrate and pool habitat
for potential resident fish to be extremely limited.
The area surrounding Waterfall Creek is covered
by Salmonberry thickets and alder shrubland
patches. A variety of birds and mammals like-
ly use the area as foraging and cover habitat.
Although impacts from construction and plant
operation would be associated with developing
Hydro-power at this site it is not believed that
they would be significant enough to require miti-
gatory action with proper environmental design.
Figure 4. False Pass area geology.
Figure 5. Waterfall Creek seen from drone at 255’ el-
evation above sea level.
Figure 6. Small cascade and pool in Waterfall Creek.
Page 4Living Systems DesignFalse Pass Hydro Recon: 20150910
WATERFALL CREEK SUMMARY
According to calculations provided in the Baker report, power potential for Waterfall Creek is likely
limited to approximately 2-10 kWh. Our investigations confirm this range. Given the limited power
potential and potential difficulty in developing access to an intake site through rugged bedrock
topography, we concluded that Watefall Creek would not be capable of having a signficant posi-
tive impact on energy security or costs for the community of False Pass. The site may be suitable
for a small, off-grid development of some kind (e.g. fishing lodge) as long as the system could be
designed without the necessity of road access to the intake structure.
UNGA MAN CREEK
LOCATION & LAND STATUS
Unga Man Creek flows to saltwater 1.2 miles
north of the community False Pass (54°52’23” N
163°24’54” W), just before the terminus of the
northern portion of the community road system.
The majority of the watershed is owned by the
Isanotski Corporation, with the uppermost por-
tions managed by the Aleutians Peninsula Na-
tional Wildlife Refuge. The lower reaches of the
creek are easily accessible via the road system,
including a bridge with provides access to the
community dump just north of the creek.
GEOLOGY
Like most of the area surrounding False Pass,
Unga Man Creek basin is mapped as Qtv, Volca-
nics. The watershed includes a number of highly
active alluvial fans, including the mainstem of
Unga Man Creek and the two primary tributar-
ies. Substrate between the lower extent of our
survey (beginnning at the bridge) and including
approximately 1 mile upstream included sand,
gravel, cobble and boulder with the surveyed
reaches dominated by gravel and cobble and the
upper reaches dominated by cobble and gravel.
No exposed bedrock was identifiied in or near the
channel for the entire survey length.
HYDROLOGY
Unga Man Creek has a basin area of approxi-
mately 3.9 square miles that draws from a peak
elevation of 2,700 feet. A field investigation of
Unga Man Creek conducted in support of the
Baker report used the Drogue method to record
a discharge in January 2010 of approximately 10
cfs. Our field crew used a Global Water Systems
“Flow Probe” to record four manual discharge measurements in Unga Man Creek over the course of
our field survey that ranged from 6.3 cfs to 8.7 cfs. Conversations with a number of local residents,
the historically low snow accumulations from the previous winter and the the lack of precipitation
preceding the timing of our field trip suggest that the the flows we recorded should indicate an ap-
proximate low flow for the watershed during the Summer months.
Figure 7. View of Unga Man Creek watershed taken
by drone at 204 feet above sea level.
Figure 8. View of Unga Man Creek relationship to
APICDA fish processing plant and North end of town.
Page 5Living Systems DesignFalse Pass Hydro Recon: 20150910
A memo assembled by Polar Consult in support of
this reconnaissance report calculated an estimat-
ed annual range of flow from 3 - 25 cfs for Unga
Man Creek based on the USGS record provided
at Russel Creek in nearby Cold Bay (see attach-
ment). It was emphasized in this report that the
flows at Russel Creek provide only a very rough
estimate of flows in the Unga Man watershed but
that these were the best data available for recon-
naissance.
The City and APICDA recognize the importance
of establishing an emperical record of flow for
Unga Man Creek as a critical step in determining
Hydro-power feasibility and upon their initiative
we installed two stream gages to begin that pro-
cess. The first site was located just downstream
of the bridge that crosses Unga Man Creek and
the second site was located approximately .2
miles upstream of the bridge site (see figure 10).
Site selection was fairly challenging because of
the lack of bedrock anywhere within the sur-
veyed channel length and the limited availability
of stable pool features. The size of the substrate
within the channel and the bankfull width of the
creek both indicate that annual flows are high at
times. Large Boulders were used for anchoring
both gages (See figure 9). Stainless Hobo Water
Loggers were installed in stilling wells along with
staff gages. Each station also includes its own
barometric correction logger. City of False Pass
staff were trained in using the Global Water Sys-
tems flow probe for manual discharge measure-
ments and they will be doing the field work nec-
essary to establish a rating curve for interpreting
the water logger data.
FISH & WILDLIFE
Unga Man Creek is not mapped as an anadromous
stream in the AWC, however, our site survey en-
countered approximately 1,500 pink salmon over
the course of the surveyed stream length. The
Pinks were noted as attempting to spawn but no
reds were identified. The size of the substrate in
the sureyed length may be prohibitive to much
success for Pink salmon spawning. It is worth
noting that 2015 was a very big Pink salmon year
with the third largest catch ever recorded.
Five minnow traps were set in pools encounted
along the survey length and were baited with
salmon eggs. The traps soaked for five hours and
no juvenile or resident fish were caught.
Figure 9. Stream gage installed near bridge over Unga
Man Creek. Aluminum angle was cut and bolted to a
large boulder and provided a mounting structure for
a stilling well and staff gage.
Figure 10. Stream gage installation locations.
Figure 11. Minnow trapping just downstream of the
bridge. Note spawned out Pink salmon in the back-
ground.
Page 6Living Systems DesignFalse Pass Hydro Recon: 20150910
The area surrounding Unga Creek is covered by Salmonberry thickets and alder shrubland patch-
es. A variety of birds and mammals likely use the area as foraging and cover habitat. Although
impacts from construction and plant operation would be associated with developing Hydro-power
at this site it is not believed that they would be significant enough to require mitigatory action with
proper environmental design.
UNGA MAN CREEK SUMMARY
According to calculations provided in the Baker report, power potential for Unga Man Creek may
average 69 kWh. Our investigations would suggest that the hydrology of this basin could exceed
this estimate. Much will depend on additional field work to determine the nature of Unga Man
Creek’s aquatic ecology, developing a local record of flow and determining the details of an even-
tual project design. That having been said, the results of previous studies and the field reconnais-
sance summarized here suggest that Unga Man Creek could meet the communities energy demand
for most of the year and provide one of the best options identified for community energy to date.
PRELIMINARY DESIGN
OVERVIEW
A run of the river design for Hydro-power appears to be worth further investigation at Unga Man
Creek. A relatively easy to access intake site was identified at 250 feet above sea level, just down-
stream of the confluence of the two major tributaries, that would provide a collection point for the
majority of the flow within the watershed. A powerhouse site could be easily located downslope of
the community dump at approximately 50 feet above sea level. This design would provide a gross
head of 200 feet (see figure 13).
ACCESS
Access to Unga Man Creek appears to be very straight forward. An existing road extends and
crosses the creek and has already been roughed in to the powerhouse site noted above. Access
to the intake site noted in this preliminary design could be constructed over what appears to be
relatively easy road building conditions with limted to no bedrock cutting necessary and a mild and
mostly consistent gradient over alluvial and colluvial deposits. One small wetalnd area would need
to be crossed and designed for as well as numerous steeper gradient ephemeral streams.
Figure 12. Panorama of Unga Man Creek taken from the North side of the valley looking South across the pre-
liminary desgin project area described below.
Page 7Living Systems DesignFalse Pass Hydro Recon: 20150910
INTAKE SITE AND PENSTOCK
The intake site identified for this preliminary design was selected at a natural channel narrowing
just downstram of the confluence of the two major tributaries to Unga Man Creek. This site would
provide an access point that would support a penstock route that would rapidly exit the active
floodplain and could be buried in the access road for the rest of its decent to the powerhouse. This
site would necessitate a design that could be anchored in alluvial sediments of cobble and boulder
and may require some channel stabilzation upstream to keep high flow events from moving the
channel around the intake site. This site would also need to be designed to withstand high flow
events and transport relatively large quanties and sizes of bedload. Of all of the infrastructure in-
cluded in this preliminary design, the intake structure looks to be the most challenging.
POWERHOUSE SITE
A powerhouse site could be located downslope of the community dump in a location that would
support easy construction of a tailrace return of the water approximately 20 feet in elevation above
where the creek meets saltwater.
TRANSMISSION
A transmission line from the powerhouse could be run back over the bridge and along the existing
road for approximately 3,000 feet to connect to the community grid.
Figure 13. Preliminary design for Unga Man Creek run of the river Hydro-power project.
Intake
Power-houseRoad & PenstockTransmission
Unga Man Watershed
Page 8Living Systems DesignFalse Pass Hydro Recon: 20150910
COST ESTIMATE
Polar Consult prepared a project performance and design cost estimate memo in support of this
reconnaissance report that included an estimated costs for feasibility, design, permitting, and
construction shown below.
ECONOMIC ANALYSIS
Using the estimated costs included in the table above, the AEA Economic Model worksheet was
used to develop an input to benefit ratio of 1.82.
CONCLUSION
SUMMARY
Based on the information provided in this rec-
onaissance effort, a run of the river Hydro-power
project looks to be a viable option for greatly en-
hancing community energy security and afford-
abilty. Working with Polar Consult, a preliminary
project design (see attachment) is estimated
to support a design capacity of 125 kW, which
would meet approximately 86% of the False Pass
Utility load.
RECOMMENDATIONS
In addition to establishing a record of flow using
the existing stations, we recommend the instal-
lation of an additional station closer to the pro-
spective intake site included in the preliminary
design. Given the alluvial nature of the Unga Man
Creek basin, including what appears to be a very
substantial hyporheic zone, it may be possible
to access more water than is indicated by the
stream gaging stations near the bridge.
It is also clear that addtional geotechnical surveys could provide important design criteria for the
intake site.
We also reccomend that additional minnow trapping and spring beach seining be performed to
better characterize the aquatic ecology of this stream, particularly whether the stream warrants
an AWC designation. When paired with mapping of potential spawning habitat should inform the
question of whether a water reservation would be necessary for maintaining fish habitat.
Figure 15. Training City of False Pass staff to conduct
manual flow measurements for establishing the rat-
ing curve for stream gages in Unga Man Creek.
Figure 14. Cost estimate table from Polar Consult Memo (see attached).
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
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aPolarconsult & Living Systems DesignFalse Pass Hydro Feasibility: 20161125
False Pass Hydroelectric Potential at
Unga Man Creek
2016 Feasibility Study Progress Report
Prepared for the City of False Pass &
The Aleutian Pribilof Islands Community Development Association (APICDA)
by: Joel Groves of Polarconsult & Bob Christensen of Living Systems Design
20161215
Cover 2. Stream gage at Unga Man Creek bridge
Cover 1. Unga Man Creek seen from north valley wall
iPolarconsult & Living Systems DesignFalse Pass Hydro Feasibility: 20161125
List of Figures .......................................................................................................ii
Executive Summary ............................................................................................iii
Background ..........................................................................................................1
Introduction ......................................................................................................................................................1
False Pass, Alaska .............................................................................................................................................1
Current Electrical Generation ......................................................................................................................2
Previous Reports .............................................................................................................................................3
Unga Man Creek...................................................................................................4
Location & Land Status..................................................................................................................................4
Geology ..............................................................................................................................................................4
Hydrology ..........................................................................................................................................................5
Topography & Vegetation ............................................................................................................................6
Fish & Wildlife ...................................................................................................................................................8
Preliminary Design ............................................................................................10
Hydropower Resource Considered ..........................................................................................................10
General Project Considerations .................................................................................................................11
Description of Preferred Project Configuration ...................................................................................12
Conclusion ..........................................................................................................16
Summary ...........................................................................................................................................................16
Recommendations ........................................................................................................................................17
TABLE OF CONTENTS
iiPolarconsult & Living Systems DesignFalse Pass Hydro Feasibility: 20161125
Cover 1. Unga Man Creek seen from north valley wall .......................................................................a
Cover 2. Stream gage at Unga Man Creek bridge ................................................................................a
Executive Summary 1. Typical aerial of Unga man Creek braid taken from drone ..................iv
Figure 1. The community of False Pass is located on Unimak Island. ............................................1
Figure 2. Google Earth view of the False Pass Village. ........................................................................1
Figure 3. Summary of utility statistics ......................................................................................................2
Figure 4. Drone’s eye view of Bering Pacific Seafoods plant. ...........................................................2
Figure 5. General land status near False Pass, AK. ................................................................................4
Figure 6. False Pass area geology. ..............................................................................................................4
Figure 7. Stream gage installation locations. ........................................................................................5
Figure 8 New logger installed in upper reaches of Unga Man Creek ...........................................5
Figure 9. Flow records for Unga Man Creek and Russell Creek basins ..........................................6
Figure 10. Panoramic photo of the upper reaches of Unga Man Creek .......................................6
Figure 11. Terrain and ortho imagery data collected via drone in 2016 field trip. .....................7
Figure 12. Draft Vegetation Classification draped over digital surface model ...........................8
Figure 13. Salmon foot count graph. .......................................................................................................8
Figure 14. Dominant substrates by reach. ..............................................................................................9
Figure 15. Example gravel and cobble mix from lower reach. .........................................................9
Figure 16. Example cobble and boulder mix from middle reach. ..................................................9
Figure 17. Example boulder and cobble mix from upper reaches. ................................................9
Figure 18. Setting minnow traps for resident & juvenile fish .........................................................10
Figure 19. Study area ....................................................................................................................................10
Figure 20. Estimated design parameters. ...............................................................................................13
Figure 21. Recommended project configuration ................................................................................14
LIST OF FIGURES
Page iiiPolarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
EXECUTIVE SUMMARY
This Feasibility Study Progress Report provides an update on the resource data collection, analysis,
and preliminary findings to date for hydropower development potential at Unga Man Creek for the
community of False Pass. Since the Reconnaissance Study was issued in fall 2015, the following
has occurred:
• Conducted additional fish surveys at Unga Man Creek in 2016 to continue building record of
anadromous and resident fish presence and abundance,
• Conducted additional fish habitat surveys to define extent and quality of fish habitat at Unga
Man Creek,
• Collected aerial imagery and developed a digital surface model of Unga Man valley topography
to better understand vegetation and topography in the project area,
• Collected one year of hydrology data at the bridge stream gauging station installed in August
2015, and,
• Installed two new stream gauging stations on the north and south fork to refine upper basin
hydrology.
This new resource data has been analyzed to further evaluate the feasibility of a hydro project at
Unga Man Creek. Current analysis has produced the following preliminary findings.
1. Fish habitat surveys indicate productive anadromous (predominantly pink salmon) habitat
in the lower ¼ mile of Unga Man Creek, downstream of the proposed powerhouse location.
Surveyed habitat conditions upstream of this reach are poorly suited to salmon spawning due
to the larger (predominately cobble and boulder) substrate size and highly unstable stream
bed.
2. Review of aerial imagery of the project area indicates wetlands are limited to a few isolated
areas that can be largely avoided by project development. These aerial interpretations
should be confirmed by ground surveys during the design and permitting phase of project
development.
3. There is a correlation between flows at Unga Man Creek and Russell Creek at Cold Bay. The
correlation was of moderate quality (R2 of 0.47 for the one year of data) but good enough to
build a refined long-term hydrology model for Unga Man Creek. That model indicates Unga
Man hydrology is a bit less favorable than the ‘no-data’ estimates generated in 2015 and
used for the Reconnaissance Report. Given that weather in the 2015-16 year was unusual, it
remains uncertain how the basin correlation and hydrology model may change as we collect
more data.
4. Current economic analysis using the new hydrology model indicates a 140 kW hydro can
provide about 75% of annual utility load, lower than the 84% estimated in the Reconnaissance
Study. This estimate is expected to continue fluctuating as our understanding of Unga Man
hydrology improves with additional data.
5. Estimated benefit-cost ratio decreased from 1.8 in the Reconnaissance Study to 1.4 with
current data, mainly due to the refined hydrology and resulting decreased project performance.
6. We started to look at project sizing, and increased installed capacity from 125 kW to 140
kW to better carry existing utility load. Recommended installed capacity is still subject to
revision with future data and analysis.
7. Field observations and initial analysis confirmed the cost estimate methodology in the
Reconnaissance Study is still valid. The estimated construction cost increased to $4.6 million
(probable range of $3.6 to 5.4 million) due to the increase in installed capacity.
8. We took a preliminary look at dispatchable loads (interruptible heating loads) in the community
that could be served by unused hydro capacity. Analysis indicates that 30 to 40 percent of
annual heating loads at six public buildings could be served by excess hydro capacity (by
a 140 kW project). A larger 180 kW hydro project could supply 50 to 60 percent of these
heating loads on a dispatchable basis. Future analysis may indicate a larger installed capacity
is justified.
Page ivPolarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
9. Combined average annual fuel savings (power plant + dispatched heat loads) is estimated at
45,700 gallons annually for a 140 kW hydro project.
10. We reviewed a range of project configurations throughout the basin and the general layout
developed in the Reconnaissance Report (a project on the main stem of Unga Man Creek)
appears to be the most economic. Moving higher up in the basin trades less flow for more
head with slight degradation of resultant performance (less annual energy for a given
installed capacity) but higher cost mainly due to longer access trails through more difficult
terrain. Overall, these project configurations appear to be economically inferior due to slightly
decreased performance and increased cost.
11. If ADFG in-stream flow requirements are higher than our current assumptions, this could
reverse the above conclusion, with north fork- or south fork-only project configurations
possibly being preferred over a main-stem configuration because they preserve the other fork
for habitat flow. Development of the north fork is probably better than the south fork due to
easier access, but this determination would depend on hydrology from the gauges installed
this year and interpretation of site conditions above the limits of 2016 foot surveys.
Based on the above findings, we recommend that feasibility analysis for this project continue. Key
elements of the recommended 2017 Work Plan are:
1. Continue stream gauging with existing gauges.
2. Continue fisheries studies. Next steps are to consult with ADFG area biologist, then ADFG
habitat division to review creek resource value and project. ADFG feedback will help guide
the scope / direction of future fisheries studies and project evaluation.
3. Continue analysis as additional data is collected and analyzed. Characterize potential
dispatched heat loads, update hydrology model with additional data, consider fish habitat
requirements in project layout and size. Finalize layout and capacity, finalize feasibility-level
project cost estimate and economics, prepare final report.
4. Start long-lead permit actions. Enough data now exists to file a FERC declaration of intention,
which will define the permitting process (FERC vs non-FERC) for the project. Existing
information indicates it should be non-FERC.
Executive Summary 1. Typical aerial of Unga man Creek braid taken from drone
Page 1Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
BACKGROUND
INTRODUCTION
Polarconsult Alaska, Inc. (Polarconsult) and Living Systems Design, LLC (LSD) were contracted by
the City of False Pass (City) and The Aleutian Pribilof Islands Community Development Association
(APICDA) to conduct feasibility investigations for hydropower development on Unga Man Creek
near False Pass, Alaska. A field trip that included City and APICDA staff was conducted August 15
to 19, 2016 to assess technical and environmental conditions at Unga Man Creek and install stream
gages at key points in the Unga Man basin. This report summarizes information gathered during
this field trip along with additional research conducted for feasibility analysis.
The current effort builds on the out-
come of a reconnaissance study com-
pleted by LSD in 2015 and prior stud-
ies listed in Section 1.3, that identified
Unga Man Creek as the preferred hy-
dropower resource for the community.
Feasibility investigations conducted in
2016 focused on collecting resource
data that will be used to refine the
project configuration, performance,
environmental impacts, permitting re-
quirements, and cost.
FALSE PASS, ALASKA
The community of False Pass is located
on Unimak Island at the eastern edge
of the Aleutian island chain (54°49′40″N 163°23′57″W), just across Isanotski Strait from the Alas-
ka Peninsula (Fig. 1). It is an isolated coastal village that is only accessible by boat and plane (pri-
marily via the community of Cold Bay).
The landscape surrounding the com-
munity is mountainous and spectacu-
lar in its beauty with the Bering Sea
to the North and the Gulf of Alaska to
the South (Fig. 2). The climate is sub-
polar maritime with cool summers and
relatively mild winters. Annual precipi-
tation averages around 30 inches with
3-5 feet of snow in the winter. Wind
and fog are common. Sea ice has been
known to extend into the area in colder
winters.
There are approximately 50 year round
residents who live in False Pass. Most
residents participate in the commercial
and subsistence fishing economies to
some degree. These folks are joined in
the summer months by approximately 60 part-time residents who are employed at the APICDA
fish processing plant. Other employment opportunities include local government, the school and a
variety of services.
Figure 2. Google Earth view of the False Pass Village.
Airport Village
Harbor
Fish
Plant
Roundtop Mt.
Unga Man
Valley
Ferry
Dock
Figure 1. The community of False Pass is located on Unimak Is-
land on the Aleutian Island chain.
False Pass
Page 2Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
CURRENT ELECTRICAL GENERATION
Electricity service in the community of False Pass is provided by the City of False Pass, which op-
erates a certificated electric utility authorized by Certificate of Public Convenience and Necessity
No. 442 issued by the Alaska Public Utilities Commission (now Regulatory Commission of Alaska) in
1993. The utility operates an isolated electric grid in the village, generating electricity with diesel
generators (125 kilowatts (kW), 175 kW and 180 kW units available depending on load). The village
load averages around 70 kW at generation, for total annual generation of approximately 600,000
kilowatt-hours (kWh). Summary utility statistics are presented in Figure 3.
APICDA subsidiary Bering Pacific Seafoods
(BPS) operates a fish processing plant in
False Pass. The plant self-generates elec-
tricity with diesel generators (1,250 kW,
365 kW, 350 kW and 350 kW units are in-
stalled). The plant’s average load in 2016
was approximately 385 kW, and peak load
was approximately 850 kW. BPS is consid-
ering plant modifications which may alter
the plant’s electric demand.
Electricity cost in False Pass is high by most
standards, ranging between 40 to 50 cents
per kWh in recent years. However, this is
lower than in many small rural Alaska com-
munities, where electric rates of 50 to 80
cents per kWh (and higher) are common.
Figure 3. Summary of utility statistics
Figure 4. Drone’s eye view of Unga Man Creek Bridge and
road back to Bering Pacific Seafoods plant.
Fish Plant
Unga Man Creek
Page 3Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
The utility distribution system takes electricity generated at 480 volts three-phase in the diesel
powerhouse and increases the voltage to 7.2/12.47 kV for distribution. The distribution system is
underground, and is three phase out to the BPS fish plant. The existing distribution system ex-
tends to the crab pot storage yard just north of the BPS plant.
PREVIOUS REPORTS
The community of False Pass has been
actively seeking alternative energy solu-
tions to provide greater energy security
to the community and reduce the costs
of energy to its residents and businesses.
Hydropower has been noted in most of
the reports as potentially feasible. Both
wind and tidal have also been looked
at and have received mixed reviews in
terms of feasibility thus far. Five reports
were reviewed as part of this feasibility
assessment:
• A report was written in 1982 that
described hydroelectric generation
opportunities near False Pass as
not economically feasible. This
is not surprising given that the
cost of diesel at that time was a
little over one dollar per gallon.
(Reconnaissance Study of Energy
Requirements and Alternatives,
1982)
• A more in depth report from 2010
(Hereinafter “The Baker report”)
looked at a number of communities
in the area and summarized
options for wind, tidal and hydro
in False Pass. Recommendations
from this report were to prioritize
wind and hydro first because these
technologies are more mature and
straightforward in terms of operation and maintenance. For hydro, two creeks were looked
at: Unga Man Creek and Waterfall Creek. Both sites were noted by the authors as worth
further investigation with an emphasis on establishing an annual record of flow to determine
economic feasibility. (Renewable Energy Resource Assessment for the Communities of Cold
Bay, False Pass, and Nelson Lagoon, 2014)
• An AEA memo dated February 17, 2015 was reviewed that looked at two design options in the
Unga Man Creek watershed. The author used gaging data from Russell Creek in nearby Cold
Bay to estimate energy availability for two Unga Man Creek options at capable of providing
140-150 kW. It was recommended to develop a flow record and assess aquatic habitat for this
system as the next logical step in reconnaissance. (False Pass Hydro Review, February 2015).
• An initial study of wind energy was reported on in July of 2015. This report confirmed
observations in previous reconnaissance work on wind power for False Pass and concluded
that the wind resource is difficult to exploit because of local turbulence. (False Pass Wind
Energy Feasibility Report, 2015).
• A hydro reconnaissance study for False Pass completed by LSD in 2015. This study reviewed
the potential of Unga Man Creek and Waterfall Creek and concluded that Unga Man Creek was
a better option for the community and recommended continued study.
Page 4Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
UNGA MAN CREEK
LOCATION & LAND STATUS
Unga Man Creek flows to saltwater 1.2 miles north
of the community False Pass, just before the ter-
minus of the northern portion of the community
road system. The majority of the watershed is
owned by the Isanotski Corporation, with the up-
permost portions managed by the Aleutians Pen-
insula National Wildlife Refuge. The lower reaches
of the creek are easily accessible via the road sys-
tem, including a bridge which provides access to
the community dump just north of the creek.
GEOLOGY
The Unga Man Creek valley is mapped as Alluvi-
al Deposits in the valley bottom and Quaternary
Volcanics extending from the valley wall to the sur-
rounding peaks (see figure 5). The main-stem and
primary tributaries remain active alluvial chan-
nels today. Substrate between the lower extent of
our survey (beginning in the intertidal zone) and
including approximately 3.33 miles upstream in-
cluded sand, gravel, cobble and boulder. Reaches
downstream of the bridge were dominated by a
mixture of cobbles and gravels with intermittent
pockets of sand. The reaches from the bridge to
the primary fork were dominated by a mixture of
cobble sand boulders with intermittent pockets
of gravel. The reaches upstream of the fork were
dominated by a mixture of boulders and cobbles with rare pockets of gravel (see Figure 17). Prob-
able bedrock was observed only at a single location in the survey reach, at a cut bank where the
current creek meander is eroding the valley sidewall. This exposure was at River Mile (RM) 1.33
(river-right). Exposed rock appeared to be weak, with loose rock readily decomposing into clayey
material. Other cut banks at RM 1.0 (river-right) and RM 1.67 (river-left) appear to be layered ash
deposits that are holding vertical faces approximately 10 feet tall.
Based on observations, bedrock depth beneath
alluvial deposits along the surveyed reach is ex-
pected to be variable, and at many areas may
be too deep to economically found the diversion
structure. If encountered, bedrock is expected
to be relatively weak, with a preliminary estimate
of allowable bearing pressure at 2,000 pounds
per square foot and lateral friction coefficient of
0.25. Based on observations, conceptual design
of a diversion structure in the surveyed reach
should be based on a footing founded in alluvium
or weak rock with the above preliminary design
values. These preliminary design values will need
to be updated once a specific project configura-
tion is selected and a site-specific geotechnical
investigation completed.Figure 6. False Pass area geology.
Unga Man
Figure 5. General land status near False Pass, AK.
Page 5Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
HYDROLOGY
Unga Man Creek has an east-facing basin area of
3.79 square miles. The eastern perimeter of the
basin is formed by the coast and lowlands along
Isanotski Strait, and the north, south, and west
perimeters of the basin are predominantly moun-
tain peaks and ridges with elevations ranging
from approximately 2,000 to 2,800 feet, with the
highest peaks along the western perimeter. The
USGS quad map for the area published in 1995
indicates that some alpine areas of the basin were
once glaciated, but glaciers were either much di-
minished or non-existent in August 2016.
The City and APICDA recognize the importance of
establishing an empirical record of flow for Unga
Man Creek as a critical step in determining hydro-
power feasibility and upon their initiative we in-
stalled two stream gages to begin that process in
2015. The first site was located just downstream
of the bridge that crosses Unga Man Creek (RM
0.61) and the second site was located approxi-
mately 0.14 miles upstream of the bridge site (RM
0.75) (see figure 7). The logger at the bridge site
has been providing a stable record of flow since
its installation, however, the logger upstream of
the bridge failed during a high flow event during
the winter of 2015-16.
During the August 2016 field trip we removed
the hardware from the failed logger and used the
parts for installing two more loggers approximately 1 mile upstream of the bridge, just beyond the
primary fork in the main stem of the creek (see figure 7). The upstream loggers, both at RM 1.65,
will allow for an assessment of the unique hydrology of the two primary basins contributing to the
total flow of Unga Man Creek. For example, although the individual basin areas in the headwaters
of Unga Man Creek are similar in size, because of their different aspects (NE vs SE) it is possible
that the southern basin holds snow for longer pe-
riods of time and thus contributes more flow dur-
ing the mid-summer time period.
Site selection for gaging stations was fairly chal-
lenging again this year because of the lack of
bedrock along the surveyed channel length and
the limited availability of stable pool features.
The size of the substrate within the channel and
the bank full width of the creek both indicate that
annual flows are high at times. Large boulders
were used for anchoring each gage (See figure
8). Stainless Hobo Water Loggers were installed
in stilling wells along with staff gages in a similar
fashion to last year except for the new bluetooth
data download features of the loggers used at
the upstream gage sites. Each station includes
its own barometric correction. City of False Pass
Figure 8 New logger installed in upper reaches of
Unga Man Creek - North Tributary.
Figure 7. Stream gage installation locations.
Page 6Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
and VPSO staff were trained in wa-
ter logger data download as well
as using the Global Water Systems
flow probe for manual discharge
measurements and they will be do-
ing the fieldwork necessary to es-
tablish a rating curve for interpret-
ing the water logger data.
Hydrology data collected from Au-
gust 2015 to August 2016 at the
bridge gauging station was ana-
lyzed and compared to the long-
term hydrology record at Russell
Creek in Cold Bay. The concurrent
period of record shows a clear cor-
relation between the two basins,
with a coefficient of determination
(R 2) of 0.47. R 2 for the fall and win -
ter season (October 2015 to March
2016) was much higher at 0.79, and R 2 for the spring and summer season was much lower at 0.17.
The period of record at Unga Man Creek is not yet long enough to draw firm conclusions about sea-
sonal relationships between these two basins, but the correlation is sufficient to refine the hydrol-
ogy model and make more educated estimates about the long-term hydrology at Unga Man Creek.
Based on the available record, it appears Unga Man Creek is “flashier” than Russell Creek, which
is expected given that the Unga Man basin is 1/10th the size of the Russell Creek basin. Figure 9
shows the concurrent flow record for both basins. The actual flow has been divided by the respec-
tive basin areas to aid in visual comparison. The detailed hydrology analysis and description of the
hydrology study efforts to date is presented in Attachment 1.
TOPOGRAPHY & VEGETATION
Topographic and land cover data available for the Unga Man Creek watershed has been very coarse
to date. Our team collected low elevation aerial photography in order to develop fine-scaled topo-
graphic and vegetation data for project design.
Figure 10. Panoramic photo of the upper reaches of Unga Man Creek; North fork at right, South fork at left.
Figure 9. Flow records for Unga Man Creek and Russell Creek basins
Page 7Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
The digital surface model shown in figure 11 indicates a total difference in elevation from mean
high tide to the upper reaches of the potential project area of approximately 400 feet. The gradient
of the stream is relatively consistent from saltwater to the bridge at an average of 2%. From the
bridge upstream to the main fork the grade averages 3.5%. Upstream of the main fork the grade
increases a fair bit with an average of 9.5% in the south fork and 7.5% in the north fork up to the
end of the 2016 survey area.
The slopes leading to the stream channel are mostly gentle with fairly low cut banks except in a
few locations. The topography becomes significantly more rugged upstream of the main fork, es-
pecially in the south fork valley.
Vegetation in the project area is dominated by shrub thickets that are comprised mostly of elder-
berry, alder and willow in the tall category and salmonberry and devil’s club in the medium cat-
egory (Figure 12). Patches of herbaceous meadow and wet meadow occur in a few locations near
the beach and where finer substrates have accumulated from past alluvial activity. Meadow plants
include cow parsnip, fireweed, lupine, shooting star, aster and a variety of graminoid species.
Figure 11. Terrain and ortho imagery data collected via drone in 2016 field trip.
Page 8Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
FISH & WILDLIFE
Since the field work conducted for the 2015 recon-
naissance study, Unga Man Creek has been nomi-
nated for inclusion in Alaska’s Anadromous Waters
Catalog (AWC). It is widely recognized that the 2015
pink salmon run was one of the largest on record so
we decided to conduct more thorough surveys of fish
use of Unga Man Creek to look closer at its anadromy.
The False Pass VPSO was trained to conduct salm-
on “foot counts” from the bridge to the primary fork
in Unga Man Creek (the purple reach in Figure 13).
Foot counts were performed from mid July to early
September. The final survey was to be performed in
mid-September but high flows prohibited access. Pink
Salmon began to show up in Unga Man Creek in early-
August with a peak presence observed in late-August throughout the length of the surveyed reach.
Sockeye and Chum salmon were also observed in these reaches during this time period but no
adult Coho salmon. See the chart in Figure 14 for a summary of data collected.
Figure 12. Draft Vegetation Classification draped over digital surface model.
Figure 13. Salmon foot count graph.
Page 9Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
During the field visit in August we conducted more detailed surveys of Unga Man Creek fish habi-
tat. The creek was walked from the intertidal zone up to the new logger installations located just
upstream of the primary fork in the creek. Geotagged photos were taken along the stream length
to document dominant substrate sizes by reach and provide a general assessment of salmon
spawning habitat suitability in Unga Man Creek.
The majority of stream surveyed was poorly suited to salmon spawning because most reaches were
dominated by mixtures of cobble and boulder (see Figures 14-17). Pink salmon were observed ac-
tively digging redds in the lowermost reaches, just upstream of the intertidal zone, where the gra-
dients were suitable to deposition of gravel patches of 10-100 square meters. The reaches above
the bridge rarely had patches of more than a single square meter, and most of these patches are
likely very unstable. It is possible that some of these smaller patches are suitable for Dolly Varden.
The presence of Sockeye is a somewhat mysterious as the watershed does not include a lake and
what spawning gravels there are seem to be most suited to pink salmon and concentrated near
the intertidal reaches. There have been documented cases in Alaska of Sockeye spawning in very
large riverine systems and in marine beaches but these are relatively rare. It is most likely that
Sockeye observed in Unga Man Creek are strays from nearby lake systems (e.g. Hungry’s Creek
Figure 15. Example gravel and
cobble mix from lower reach.
Figure 14. Dominant substrates by reach.
Figure 16. Example cobble and
boulder mix from middle reach.
Figure 17. Example boulder and
cobble mix from upper reaches.
Page 10Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
and Otter Point Creek).
During the August field visit we also set 10 min-
now traps baited with salmon eggs in pool habitat
upstream and downstream of the Unga Man Creek
bridge. One trap was damaged by a bear and caught
no fish. In the remaining 9 traps, 132 Dolly Varden
were caught that ranged in size from 5-18 cm. Ad-
ditionally, 2 Coho fry were caught in two separate
traps and they measured 8 cm and 7 cm. The pres-
ence of Coho fry is also somewhat mysterious as
no adults have been documented in the stream.
These fry may be nomads from a nearby spawning
stream, which according to the AWC is in Cold Bay.
Bear sign was observed along the stream indicat-
ing some predation on salmon occurs. A variety of
other birds and mammals likely use the area as for-
aging and cover habitat.
Although impacts to fish and wildlife habitat from construction and operation of a hydropower facil-
ity on Unga Man Creek would be unavoidable, it is likely that a sound design could largely mitigate
these impacts. Additional field surveys and collaboration with the relevant agencies will be critical
to balancing the costs and benefits of such mitigatory actions and will be an important contributing
factor in determining the overall feasibility of hydropower development for False Pass.
PRELIMINARY DESIGN
HYDROPOWER RESOURCE CONSIDERED
The reach of Unga Man Creek that is under study
for hydro project development extends from tide-
water upstream to RM 2.8 on the south fork, RM
2.1 on the north fork, and RM 2.1 on the east fork
(Figure 19). Upstream of these three points, the
major tributaries branch off into several smaller
alpine tributaries which are deemed impractical
for hydropower development.
The feasibility analysis reviewed several hydro
project configurations within the study reach of
Unga Man Creek and its major tributaries to de-
termine which configurations appear to be most
feasible, and which appear to not be feasible.
Analysis indicates that projects located in the low-
er portions (below RM 2.2 on the north and south
forks) of the drainage basin will be more economi-
cally feasible than projects in the upper portions
of the basin. This is generally due to the following
reasons:
• Upper basin projects require longer access
roads / trails through more difficult terrain
than lower basin projects. These longer
access routes may increase cost to the point
that upper basin projects are significantly
more expensive than lower basin alternatives.
Figure 18. Setting minnow traps for resident & ju-
venile fish in Unga Man Creek pools.
Figure 19. Study area
Page 11Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
• While upper basin projects have more elevation drop than lower basin projects, they also
have less basin area and water flow. At Unga Man Creek, available information indicates the
increased elevation does not quite compensate for the decreased water flow, so upper basin
projects will have a lower plant capacity factor and will not produce as much energy as lower
basin projects for a given installed capacity.
The combination of higher cost and decreased performance makes upper basin project configura-
tions less economically feasible than lower basin configurations.
GENERAL PROJECT CONSIDERATIONS
Dispatchable Electric Loads
When a run-of-river hydro has more generating capacity than the utility load, the excess hydro
output can be dispatched to interruptible heating loads (such as building or water heating sys-
tems) to displace heating fuel. Public or commercial buildings are typically fitted with dispatched
electric services because the cost of the dedicated meter, controls, wiring, and mechanical system
upgrades usually exceeds the benefits for smaller buildings such as houses.
Buildings in False Pass that could be appropriate for dispatchable electric service include:
• False Pass School
• Bering Pacific Seafoods complex
• Library / Post Office
• City Office / Recreation Center
• Public Safety / Clinic Building
• City shop
The heating loads and suitability of these buildings to receive dispatchable electric services have
not been reviewed at this time. To form a preliminary estimate of the value of dispatchable energy
services for initial project analysis, the monthly heating load of these six buildings was estimated
based on their general size and climate data for nearby Cold Bay, Alaska.
Preliminary analysis indicates excess energy from a 140 kW hydro project could provide approxi-
mately 30 to 40 percent of the annual heating needs of the six buildings listed above. Excess
energy from a 180 kW hydro project could provide approximately 50 to 60 percent of the annual
heating needs of these buildings.
Installed Capacity
Selecting the installed generating capacity of a hydro project is a key part of the feasibility and
design process. Key criteria that must be considered in selecting an installed capacity follow:
• Hydro projects are long life (50+ year) assets. The project’s installed capacity should consider
both current and reasonably likely future load growth.
• The most cost-effective time to add capacity or plan for future capacity increases is during
original permitting, design and construction. It is significantly more costly to implement
capacity upgrades after the fact as many components (intake, penstock, turbine, generator,
transformer, etc.) are capacity-specific and must be replaced or duplicated rather than
expanded or upgraded.
• The hydrology of the water resource must also be well-understood and considered. More
generating capacity is useless if there is no water to drive it.
• An under-sized project can be a lost opportunity for the community, as the incremental cost
of more capacity at the time of original construction is typically modest compared with the
overall project cost or future upgrade cost.
• An over-sized project can become a burden on a utility, as it may saddle the utility with excessive
capital debt, operating / maintenance costs, and may operate at decreased efficiency.
Page 12Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
The current analysis included preliminary review of projects with capacity ranging from 100 to
200 kW. Approximately 140 kW or larger was found to maximize the percentage of existing utility
load that is supplied by the hydro plant. Smaller project capacities supply less of the utility load
because peak load exceeds their generating capacity, forcing the diesel plant to parallel with the
hydro. Larger project capacities supply a similar percentage of utility load as the 140 kW project
as performance of larger projects is constrained by water availability.
Dispatchable electric loads are another factor to be considered in selecting the installed capacity,
and as feasibility analysis continues the optimal installed capacity may change from the 140 kW
project described in this progress report.
DESCRIPTION OF PREFERRED PROJECT CONFIGURATION
Overview
Preliminary feasibility analysis has identified a 140 kW run-of-river hydro project configuration fea-
turing a diversion between RM 1.4 and RM 1.6 and a powerhouse near RM 0.15, east (downstream)
of the community dump. Estimated technical parameters and project performance for this layout
are summarized in Figure 20. Descriptions of the major project components follow.
Access
Project access would start near the end of the existing landfill access road, and is shown on Figure
21. The existing road would be extended along the west and north perimeter of the landfill, con-
tinuing downhill past the landfill to the hydro powerhouse site. The diversion access route would
start at the northwest corner of the landfill and continue up the north side of the Unga Man Creek
valley to the diversion site.
Available data suggests that the conditions along the route may be relatively straightforward for
road or trail construction. The route has maximum slopes of 15% and maximum cross slopes of
20 to 50% depending on exact routing.
The diversion access route crosses several minor tributaries. These can be crossed either with
appropriately-sized culverts or engineered fording locations. Since these minor tributaries ascend
steep (25%+) alpine slopes upstream of the trail route, fish passage upstream of the trail route is
not expected to be a design consideration for these crossings.
Diversion and Intake
Two water diversion and intake sites on the main stem of Unga Man Creek warrant consideration.
The upstream diversion site is at RM 1.6 and 260 feet above sea level (ASL), immediately down-
stream of the confluence of the north and south forks of Unga Man Creek. This site would maxi-
mize head for a main stem project. Unga Man Creek’s approximately 40-foot wide active meander
at this site is pinned against the north valley wall and incised approximately 15 to 20 feet into the
broader valley floor. Bedrock is not visible at this location.
The downstream site is at RM 1.4 and 220 feet ASL, immediately downstream of the confluence of
the east fork and main stem of Unga Man Creek. Compared to the upstream diversion site, this
site is approximately 40 feet lower in elevation but because it captures the east fork is expected
to have approximately 20 to 25 percent more flow. The downstream site is in the middle of the
valley floor, in a reach where Unga Man Creek has an approximately 120-foot wide active meander
zone that is transiting across the valley floor from the north side at RM 1.5 to the south side at RM
1.35. Bedrock is not visible at this location.
At the current level of study, both diversion sites appear to have similar technical and design con-
siderations and both project configurations have similar performance and economics. Additional
Page 13Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
factors which may influence diversion site selection include whether anadromous fish passage
through the diversion structure is required, the need for in-stream flow reservations for fish habi-
tat downstream of the structure, and site-specific geotechnical conditions.
At either site, the diversion structure may consist of an approximately 100 to 150-foot long by ap-
proximately 8 to 12-foot tall concrete wall founded in alluvium at a depth beneath the maximum
scour, with a stepped spillway to direct normal and flood flows into the downstream creek channel.
The creek channel at the spillway would be armored with a rip-rap apron sized to prevent scour.
In the floodplain area to either side of the spillway, the wall would be buttressed on upstream and
downstream sides by earth fill and capped with riprap for erosion control.
Figure 20. Estimated design parameters remain subject to change as the feasibility study investigations and
analysis continue.
Page 14Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
Figure 21. Recommended project configuration
Page 15Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
An automatic bypass gate would be built into the main diversion wall. This gate is normally closed
and is programmed to automatically open during high water events to allow sediment to flush out
of the impoundment and provide downstream gravel recruitment.
The water intake would be a coanda-type inclined screen built onto the downstream edge of the
main spillway. Water would flow over the spillway and onto this screen. Project water would fall
through the screen into a collection gallery and thence into the penstock. Excess flow would run
off the end of the screen and into the creek downstream of the diversion.
It is expected that this diversion scheme would meet the requirements of the Fishway Act (Alaska
Statute (AS) 16.05.841) by preventing admittance of fish into the project works yet allowing fish
to pass downstream when flow was sufficient.
If the permitting process determines that the diversion structure is required to comply with the
Anadromous Fish Act (AS 16.05.871), a fish ladder would be required to admit anadromous fish
upstream through the diversion structure. Compliance with AS 16.05.871 is also expected to re-
quire an in-stream flow reservation through the project bypass reach.
Penstock
The penstock would be buried in the access road/trail to the diversion site. The penstock would be
a 24-inch diameter pipe approximately 5,700 to 6,500 feet long depending on the specific diversion
and powerhouse sites selected. Secondary power and plant control lines would also be installed in
the access road / trail between the powerhouse and diversion sites to provide communications and
power to the diversion site. Net project operating head listed in Figure 20 assumes high-density
polyethylene pipe. Several types of pipe are suitable for this project.
Powerhouse Site
The powerhouse would be an approximately 24-foot by 24-foot building. The foundation will have
special design considerations to absorb lateral forces from the penstock, turbine, and generator,
but the general building shell would be of conventional commercial/industrial construction. It is
assumed the powerhouse can be sited with a finished floor elevation of 25 feet ASL. The specific
site would be selected that meets the following criteria:
• Upstream of confirmed anadromous fish habitat in the lowermost reaches of Unga Man Creek
(approximately RM 0.1).
• Outside areas susceptible to long-term meanders / flood hazards from Unga Man Creek.
• Suitable geotechnical conditions.
• Suitable to the land owner.
• Compatible with the nearby landfill operations and other concurrent land uses.
The powerhouse will house the turbine-generator, load bank, switchgear and controls, and asso-
ciated equipment for the project. The turbine would be a dual-admittance (1/3 – 2/3) crossflow
type turbine coupled via direct drive or speed increaser to a three phase 480-volt synchronous
generator. Switchgear and controls would allow the hydro power plant to automatically operate
in stand-alone mode or in parallel with the diesel power plant depending on water availability and
utility load.
The existing controls and switchgear in the existing diesel plant have not been evaluated to assess
their suitability for automatic operation with a hydro plant. Upgrades to the diesel plant may be
required.
After passing through the turbine, spent water would be discharged to a tailrace and returned to
Unga Man Creek. The tailrace can be a gravel and cobble-lined ditch. Some periodic maintenance
of the tailrace is expected as the main channel of Unga Man Creek meanders over time.
Page 16Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
Utility Extensions
Three phase 7.2 / 12.47 kV utility primary electric distribution would be extended from the exist-
ing pad-mount transformer located in the storage lot north of the Bering Pacific Seafoods plant
approximately 5,000 feet to the hydro powerhouse site. The electric extension can be installed
underground along the existing road, in conduit over the existing bridge, and underground to the
powerhouse site.
Approximately 12,000 feet of dedicated communication line is required between the diesel and
hydro powerhouses to coordinate plant operations. This can be an underground cable installed
in existing utility easements in the community and parallel to the primary power extension to the
hydro powerhouse site.
Cost Estimate
The estimated cost for the hydro project is developed in the attached project performance and
economic analysis memo (Attachment 2). The estimated construction cost is $4.6 million with a
probable range of $3.6 to $5.4 million. The cost is slightly higher than estimated in the 2015 recon-
naissance study because the installed capacity has increased from 125 kW to 140 kW.
Economic Analysis
The economic analysis of the project is presented in the attached project performance and eco-
nomic analysis (Attachment 2). Based on current data and estimates, the life-cycle benefit cost
ratio of the project is estimated to be 1.4.
The estimated benefit-cost ratio is lower than the initial estimate of 1.8 in the 2015 Reconnaissance
Study primarily because the updated hydrology data indicates lower flow in Unga Man Creek than
previously estimated. This results in decreased performance, with the hydro plant supplying an
estimated 75% of annual utility load compared with 86% estimated in the Reconnaissance Study.
CONCLUSION
SUMMARY
A 140 kW run-of-river hydro project on the main stem of Unga Man Creek appears to be a viable
option for greatly enhancing community energy security and costs. Analysis indicates lower basin
project configurations are more feasible than upper basin project configurations, and the prelimi-
nary design presented in this progress report is the preferred configuration based on available
resource data. Future resource data may alter the preferred configuration, but it is expected to
remain in the lower basin.
The estimated benefit cost ratio for the project is 1.4, with the project supplying approximate-
ly 75% of the utility’s annual electric load. Excess hydro generating capacity could be sold to
dispatchable electric services to provide approximately 35% of the annual heating load of six com-
munity buildings.
Combined average fuel savings (displaced diesel power plant and heating fuel) is estimated at
45,700 gallons annually.
This project appears compatible with fisheries resources in Unga Man Creek, as essentially all pro-
ductive anadromous habitat is located downstream of the proposed powerhouse and tailrace loca-
tion. Resident fish habitat and passage throughout the proposed bypass reach can be sustained
by high flow events and accretive flows below the diversion site. Close coordination with ADFG is
warranted to confirm these findings and define fish habitat permit requirements as soon as practi-
cal as they may have a significant impact on project cost and performance.
Page 17Polarconsult & Living Systems DesignFalse Pass Hydro Feasibility 20161125
RECOMMENDATIONS
Based on current data and analysis, the hydro project will provide significant long-term benefits to
the community of False Pass, and continued investigation is warranted. It is recommended that
the City and APICDA continue with feasibility investigations. Future work should include:
1. Continue stream gauging. One year of stream gauging data from the bridge gauging sta-
tion has been analyzed, and has confirmed that the 25-year record at Russell Creek in Cold Bay
can be used to estimate long-term hydrology trends at Unga Man Creek. Additional Unga Man
Creek data will help verify that the existing record is representative, and will help to refine and
build confidence in the relationship between the two creeks. Existing gauges at the north and
south forks of Unga Man Creek will provide flow data closer to the intake site.
2. Continue fisheries studies. Salmon were observed throughout the proposed bypass reach of
Unga Man Creek, but no spawning habitat or spawning behavior was observed in the proposed
bypass reach in 2015 or 2016. Early consultation with ADFG is recommended to coordinate on
the scope of future fisheries surveys. If the proposed bypass reach or reaches upstream of the
project are not productive fish habitat, it will benefit the community to minimize or eliminate
any in-stream flow requirements that ADFG may want on the creek.
3. Review project configuration and economics. Conduct more detailed analysis of project
configurations to finalize a preferred configuration. Project analysis using refined fisheries and
hydrology data may indicate a different configuration than what is presented in this progress
report.
4. Evaluate Dispatchable Loads. The potential load, costs, and benefits of dispatchable servic -
es should be analyzed to better quantify this opportunity and help guide selection of installed
hydro capacity.
5. Review project capacity. Current analysis indicates the 140 kW project is the smallest proj-
ect that will maximize fuel savings at the diesel power plant. Larger projects do not displace
additional fuel because hydro output is limited by water availability. Larger project capacities
would displace more heating fuel through dispatched services, which would increase project
benefits.
6. Upper Basin reconnaissance. Based on the current analysis, upper basin project configu-
rations are expected to be economically inferior to lower basin projects, and collection of ad-
ditional resource data to evaluate upper basin configurations is not recommended at this time.
7. Long-lead permit actions. Based on the favorable status of current review, it is recommend -
ed that APICDA and the City prepare and file a Declaration of Intention (DI) for the project with
the Federal Energy Regulatory Commission (FERC) to confirm the project’s non-jurisdictional
status. It normally takes FERC about 90 days to process a DI, but the process can take over
a year. There is sufficient existing information to file the DI now, and early filing will both (1)
minimize the impact of FERC delay on the project schedule and (2) provide increased certainty
with regard to the overall permitting process for the project.
False Pass Field Report for 20170822-23
Fisheries
We arrived the morning of August 22nd, 2017 to survey Unga Man Creek near False Pass. For fisheries,
the objectives for this trip were:
1. Identify barriers to adult salmon passage in the Unga Man Creek system
2. Describe the distribution of adult salmon during the typical peak of the pink run;
3. Trap for resident and juvenile salmonids in the potential bypass reach;
4. Map the distribution of suitable spawning habitat; and
5. Map the distribution of “Macro-pools”.
Barriers to Fish Passage
Unga Man Creek was surveyed from tidewater to geologically fixed barriers to adult fish movement in
the North Fork and South Fork tributaries. Two types of barriers were observed: boulder cascades and
bedrock falls. Boulder cascades with a slope > 5 degrees over > 25 meters appear to limit 99.99% of
adult salmon movement in both the North and South Forks. Bedrock falls were identified in the North
Fork upstream of the first barrier cascades. Only one fish was observed above the barrier cascades
identified on the map below. Zero fish were observed above the barrier cascades in the South Fork.
Salmon Distribution
Adult salmon foot counts were conducted on 8/22 and 8/23 that included the entirety of adult
anadromous habitat. A total of 30 Chum, 3 Sockeye and 6,679 pinks were counted. Foot counts were
summarized for every 100 meters of creek length to assess patterns in distribution. In general, fish
densities were two times higher below the bridge than above the bridge but were otherwise fairly
evenly distributed throughout the anadromous reaches (See map below).
Minnow Trapping
10 minnow traps baited with salmon eggs were set in pool habitat and along banks upstream and
downstream of the Unga Man Creek bridge in similar locations as last year. Traps were left soaking for 6-
8 hours. Catch numbers were drastically lower than was documented last summer. A total of only 6
dollies were captured and released this year compared to 132 last year. No Coho fry were captured this
year. We speculate that the abundance of pink salmon eggs left in the stream by bear predation made
our baited traps less attractive than they were during the low pink runs last year.
Potential Spawning Habitat
Potential spawning habitat was identified as predominantly gravel substrate of at least 6 inches in depth
and a minimum of one square meter in surface area. For areas less than 10 square meters, patches were
aggregated into single points once at least 10 square meters had been surveyed in a given reach.
A total of approximately 1,850 square meters of potential spawning habitat was surveyed in the
anadromous reaches of the Unga Man Creek main stem, South Fork and North Fork. The largest
individual bed was 400 square meters, which occurred in the lowermost reach of the creek. 1,727 of the
total 1,853 square meters (93%) of potential spawning habitat was observed downstream of the Unga
Man Creek bridge. 1,517 of the total 1,853 square meters (82%) of potential spawning habitat was
observed downstream of the False Pass dump (see map below).
Macro-pools
“Macro-pools” were identified using the residual pool depth method described in Special Publication
No. 13-04; A User Guide for Performing Stream Habitat Surveys in Southeast Alaska.
Summary of the method is as follows:
1. Pool width or length must be at least 10% the average channel bed width; and,
2. “Residual pool depth” (i.e. maximum pool depth – depth at riffle crest) is equal to or greater
than the average channel bed width)*(0.01)) + 0.15 m.
Unique average channel bed widths were established for the reach downstream of the Unga Man Creek
(10 meters), between the Unga Man Creek and the primary fork (8 meters), on the north fork (6 meters)
and on the south fork (5 meters).
A total of 156 square meters of macro pool habitat was identified in the adult anadromous reaches of
Unga Man Creek. 44% of this total occurred below the Unga Man Creek bridge. Most of the larger pools
were associated with large mid-channel boulders or occurred as plunge pools. Larger cut-bank pools
were identified in the lowermost reaches.
Additional Notes
We were able to add high resolution ortho imagery acquired via drone flights that includes several
hundred meters of the South Fork beyond what was mapped last summer.
Spawning gravels identified above the bridge should be considered marginal if depth of deposition is
taken into consideration. We used a minimum depth of 6” as a cutoff for spawning area designation and
most of the patches of suitable substrate above the bridge barely made this cutoff.
Salmon eggs were observed on the bottom of several pools and at creek margins especially upstream of
the bridge. They appear to be leftovers from bear predation.
The primary fork in Unga Man Creek. North fork to the right, south fork to the left.
The two maps above summarize the data collected during the 2017 field survey for fisheries. The top
map highlight the location of barriers to fish passage (pink crosses). All but the upper three barriers in
the North Fork are cascades of > 5 degrees in slope and > 25 meters in length. Small cascades in the
nearby vicinity were noted to stop most fish passage before reaching these more significant barriers.
The top map also includes the results of the adult salmon foot counts. Each red dot represents 150-350
fish over 100 meters of stream length, each yellow dot represents 50-150 fish over 100 meters of stream
length and each blue dot represents 1-50 fish over 100 meters of stream length.
The lower map displays the results of the salmon spawning habitat surveys. Each red dot indicates 101 -
400 square meters, each yellow dot 11-99 square meters and each blue dot 10 square meters
cumulative over 100 meters of stream length. The bottom map also includes the location and relative
sizes of macro-pools. Green crosses indicate pools that range from 13-25 square meters, purple crosses
indicate pools that range from 6-12 square meters and white crosses indicate pools that range from 1-5
square meters in surface area.
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Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
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June 2022 – Final Report
APPENDIX F – PERMITTING INFORMATION
Section Title Page Nos.
F.1 Federal Permits........................................................................................ F‐2
F.2 State of Alaska Permits............................................................................ F‐3
F.3 Local Permits............................................................................................ F‐4
F.4 Other Permits and Authorizations........................................................... F‐4
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Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
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F.1 FEDERAL PERMITS
F.1.1 Federal Energy Regulatory Commission (FERC)
The Federal Energy Regulatory Commission (FERC) has jurisdiction over hydroelectric projects
that meet certain criteria. Generally, these criteria include:
(1) The project is located on navigable waters,
(2) The project is located on federal land,
(3) The project affects interstate commerce, or
(4) The project is part of an interstate electrical grid.
None of the information identified by this study indicates the project meets any of these
criteria. The project bypass reach does support pink and chum salmon, but the potential
impact to these fish is not expected to constitute a significant potential impact to a commercial
fishery and thereby to interstate commerce. Accordingly, the project should not fall under
FERC jurisdiction. A Declaration of Intention will need to be filed with the FERC in the
permitting phase of the project to determine jurisdiction.
F.1.3 U.S. Army Corps of Engineers (USACE) Permits
The diversion structure, intake structure, tailrace, and other features of the recommended
project will be located within waters of the United States; therefore, permits from the USACE
will be required. The total acreage of these impacts is expected to be compatible with a
Nationwide Permit, such as #17 for hydro projects, #39 for commercial and institutional
developments, or others. If the project cannot be permitted under a Nationwide Permit, an
individual permit will need to be obtained instead.
F.1.4 U.S. Environmental Protection Agency
A stormwater pollution prevention plan will be required for construction of the project.
F.1.5 Federal Aviation Administration (FAA)
The recommended project will not have any features likely to present a hazard to aviation. The
project is expected to fall outside the distance threshold for FAA obstruction evaluation
requirements. More detailed review is warranted during the permitting phase of project
development.
City of False Pass
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June 2022 – Final Report F ‐ 3
Figure F‐1 FAA Obstruction Evaluation / Airports Airspace Analysis Tool Results
F.2 STATE OF ALASKA PERMITS
F.2.1 Alaska Department of Natural Resources (ADNR) Permits
F.2.1.1 Coastal Zone Consistency Review
The State of Alaska does not currently have a Coastal Zone Management Program.
F.2.1.2 Land Authorizations
None of the project area is on state land.
F.2.1.3 Tidelands Permits
No tidelands permits are needed for the project.
F.2.1.4 Material Sale Agreement
Not applicable. Material sources likely to be used for this project are not state‐owned.
F.2.1.5 Water Use Permit/Water Rights
The project will need to obtain water rights from the ADNR.
F.2.1.6 Dam Safety Jurisdictional Determination
The project will need to complete a dam safety program jurisdictional form. The diversion
structure is expected to not fall under ADNR dam safety program jurisdiction.
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F.2.2 Alaska Department of Fish and Game Permits
F.2.2.1 Fish Habitat Permit
The project will need to obtain a fish habitat permit from the ADFG. The fish habitat permit will
include in‐stream flow reservations (if any), mitigation requirements, restrictions on
construction activities near and below the ordinary high water mark of Unga Man Creek, and
authorization for in‐water work along Unga Man Creek for construction and on‐going
maintenance of the project.
F.2.3 Alaska Department of Transportation and Public Facilities (ADOT&PF) Permits
The landfill access road was built by ADOT&PF but is maintained by the City and crosses
Isanotski Corporation land. Coordination will be required with these entities to define driveway
permit and utility easement requirements for this project.
F.2.4 Alaska Department of Environmental Conservation (ADEC) Permits
F.2.4.1 ADEC Wastewater or Potable Water Permits
Not applicable.
F.2.4.2 Solid Waste Disposal Permit
Not applicable.
F.2.4.3 Air Quality Permit and Bulk Fuel Permit
Not applicable.
F.3 LOCAL PERMITS
The project is located within the Aleutians East Borough. A development permit may be
required from the Aleutians East Borough for the project for borrow pits that may be
opportunistically developed within the project footprint to source material for road, site pad,
and/or diversion structure construction.
F.4 OTHER PERMITS AND AUTHORIZATIONS
F.4.1 Material Sales
Locally sourced aggregate material for the project will need to be purchased from the Aleut
Corporation. Existing local quarries or on‐site borrow pits are likely suitable material sources
for road building and related construction work for this project. Rip rap may need to be
imported depending on suitability of locally available materials.
F.4.2 Site Access
Property rights for the project footprint will need to be secured in the form of leases,
easements, and right of ways as appropriate. The land in the project area is owned by the
Isanotski Corporation.
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June 2022 – Final Report F ‐ 5
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June 2022 – Final Report
APPENDIX G – COST ESTIMATES AND ECONOMIC ANALYSIS
Section Title Page Nos.
G.1 Project Cost Estimate............................................................................... G‐2
G.2 Economic Analysis and Assumptions....................................................... G‐2
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G.1 PROJECT COST ESTIMATE
The total estimated installed cost of the recommended project is presented in Table G‐1. The
estimated costs in Table G‐1 assume the project is contracted out for construction. The project
cost estimate was developed using estimated materials and quantities and necessary labor
effort and equipment lease durations for the conceptual designs described in the report
narrative.
Table G‐1 Cost Estimate for Recommended Project
Cost Item Cost Estimate
(2022 $)
PRE‐CONSTRUCTION COSTS (DESIGN, PERMITTING) $375,000
DIRECT CONSTRUCTION COSTS
Shipping/Mobilization/Equipment $480,000
Access Roads and Trails $440,000
Power and Communications Lines $219,000
Diversion and Intake Structures $508,000
Penstock $666,000
Powerhouse $708,000
Building Conversions for Interruptible Electric Heating Service $200,000
TOTAL DIRECT CONSTRUCTION COSTS $3,221,000
Construction Contingency (25%) $755,000
Contractor Profit (15%) $453,000
Construction Management/Administration $138,000
Construction Inspection/Engineering $138,000
TOTAL CONSTRUCTION COST $4,705,000
ESTIMATED TOTAL INSTALLED COST $5,080,000
G.2 ECONOMIC ANALYSIS AND ASSUMPTIONS
Table G‐2 presents the life‐cycle economic analysis of the benefits and costs of the
recommended project. Assumptions used in developing the economic analysis summarized in
Table G‐2 are described in this section.
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Table G‐2 Economic Analysis of Recommended Project
NOTES: All dollar values are in 2022 dollars. All present value calculations assume the project’s first year of operations is 2024
and are presented as 2022 dollars.
(1) Future prices for power plant and heating fuel in False Pass use the fuel price projections used by the Alaska Energy
Authority (AEA 2021).
(2) Gross excess energy is the energy generated at the powerhouse before system losses are subtracted.
(3) Capital cost estimate includes a budget for retrofitting building electrical and mechanical systems to receive interruptible
electric heating service.
(4) The benefits, costs, and benefit‐cost ratio for a grant financed project are calculated using the economic model developed
for the AEA’s Renewable Energy Grant Program Round 14 (AEA 2021).
Parameter
Recommended
Project
(180 kW)
ECONOMIC EVALUATION OF DEBT‐FINANCED PROJECT (Relative to continued diesel generation)
PROJECT BENEFITS
Total Annual Utility Load Supplied by Hydro 591,000 kWh
Resulting Reduction in Utility Fuel Purchases (5) 47,300 gallons
Annual Value of Savings from Reduced Power Plant Fuel Use (first year of operation) (1) $145,700
Annual Value of Savings from Avoided Diesel Plant Operating and Maintenance Costs $46,100
Salvage Value (at year 50) $0
Present Value of Power Plant O&M and Fuel Savings Over 50 Years $4,935,000
Gross Excess Hydro Energy Dispatched to Interruptible Electric Heating Services (2) 332,000 kWh
Resulting Reduction in Heating Fuel Purchases 8,600 gallons
Annual Value of Savings from Reduced Heating Fuel Use (first year of operation) (1) $26,500
Present Value of Heating Fuel Savings Over 50 Years $682,000
PRESENT VALUE OF PROJECT BENEFITS $5,617,000
PROJECT COSTS
Estimated Total Installed Cost of Project (study, permitting, design, and construction) (3) $5,080,000
Contributed Capital (20% of project cost) $941,000
Financed Project Cost (80% of construction cost) $3,764,000
Annual Cost of Debt Servicing (for 30 years) $231,000
Estimated Annual Operating & Maintenance Cost for Hydro Plant (for 50 years) $25,300
PRESENT VALUE OF PROJECT COSTS $6,121,000
BENEFIT‐COST RATIO (Debt‐Financed Project) 0.92
ECONOMIC EVALUATION OF GRANT‐FINANCED PROJECT (Relative to continued diesel generation)
PRESENT VALUE OF PROJECT BENEFITS (4) $5,675,000
PRESENT VALUE OF PROJECT COSTS (4) $4,932,000
BENEFIT‐COST RATIO (Grant‐Financed Project) (4) 1.15
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G.2.1 Estimated Annual Project Costs
G.2.1.1 General, Administrative, Operation, and Maintenance Expenses
Typical general and administrative costs for an electric utility like False Pass covers activities
such as meter reading, customer service, managing the utility’s business affairs, etc. These
costs will not significantly change if the means of energy generation changes from diesel to
hydro or a combination of the two.
Typical non‐fuel O&M expenses for an electric utility like False Pass includes the costs of lube
oils, filters, and other consumables for the diesel generators, maintenance labor, and similar
costs that are generally related to the running time of the diesel engines. A significant portion
of these costs will be avoided with the recommended hydro project. These savings are
estimated at $46,100 annually.
The hydroelectric project will have additional O&M costs. This includes additional labor costs
for monitoring and maintaining the hydro systems as well as direct expenses for parts and
consumables. Annual O&M costs for the recommended project are estimated at $25,000 per
year. This will include activities such as plant inspections, maintenance, routine parts
replacement, and trail maintenance costs.
G.2.1.2 Repair and Replacement and Salvage Value
Most of the hydroelectric project systems and components have a very long useful life. The
intake, penstock, powerhouse, switchgear, turbine/generator, and power line all are expected
to have useful lives of 30 to 50 years or more. Some components will require periodic repair or
replacement. Components such as pumps, actuators, some control system components and
sensors, and bearings are assumed to have a useful life of 5 to 10 years. The water turbine may
need an overhaul after about 15 to 25 years. An expense has not been allocated for repair and
replacement items. This economic analysis assumes that the present worth of repair and
replacement expenses is equal to the present worth of the plant’s salvage value at the end of
its useful life so these financial terms cancel each other and are neglected in this analysis.
In reality, neither item is zero as repair and replacement expenses will occur, and the plant
should be able to operate in perpetuity if properly maintained. The City should prepare a
business plan before construction to estimate repair and replacement costs and timing and
establish a sinking fund to pay these expenses as they are incurred. Electric rates should
include revenues to initialize and maintain the fund over the project life.
G.2.1.3 Taxes
Because the City is a local government, no tax liability is considered.
G.2.1.4 Insurance
It is assumed that the City’s existing insurance policies will be adequate for the hydroelectric
project. No additional annual costs are allocated for insurance.
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G.2.1.5 Financing
Two financing options are considered for the project: (1) debt financing and (2) grant financing.
A combination of these methods may also be used.
Debt Financing
For debt financing, 80% of the construction cost of the project is assumed to be financed for a
30‐year term at 5% interest. Loan origination costs of 3% are assumed for items such as
application fees and loan guarantee fees. State or federal loan programs can lower the City’s
borrowing costs for the project below market rates, which would reduce annual debt payments
on the project.
Grant Financing
State or federal grants can help reduce the amount of capital the City needs to borrow for the
project. BCRs for a fully‐grant financed project are developed using the economic model
developed for the Alaska Energy Authority’s (AEA’s) Renewable Energy Grant Program.
G.2.2 Estimated Project Revenues and Savings
G.2.2.1 Direct Fuel Displacement
The recommended hydro project will significantly reduce the amount of diesel fuel the City
consumes for electricity generation. Fuel savings are calculated using recent operating
efficiency and fuel costs for the City’s diesel power plant of 12.5 kWh per gallon, and the future
fuel price forecast for False Pass used by the AEA, which starts at $3.06 per gallon in 2026.25
G.2.2.2 Excess Energy
In addition to reducing diesel fuel usage at the power plant, the recommended hydro project
also generates a significant amount of excess energy that is available on an interruptible basis.
This study assumes this energy is dispatched on an interruptible basis to space heating
applications in community buildings.
The economic model for dispatch of this excess energy assumes that all of the gross available
excess energy after meeting system demand, hydro station service and the hydro load governor
system is available for dispatch to interruptible heating loads. Metered energy assumed 12%
distribution system losses and that 85% of available energy is actually dispatched to heating
loads. Thus of the 390,000 gross available energy from the hydro plant, 291,000 kWh is
assumed to be metered to dispatchable energy systems annually. This energy is assumed to
25 Alaska Fuel Price Projections 2012‐2035. ISER Working Paper 2012.1 and Microsoft Excel Spreadsheet Price
Model and Renewable Energy Grant Fund Round 14 Economic Evaluation Model (AEA 2021).
City of False Pass
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June 2022 – Final Report G ‐ 6
displace fuel oil burned in mechanical heating systems with an average efficiency of 84%,
resulting in a net reduction in heating fuel consumption of 8,600 gallons annually.
G.2.2.3 Environmental Attributes
The environmental attributes (EA) of the recommended project can be marketed nationwide to
earn the City additional revenue. The project’s EAs would be sold on the voluntary market,
where pricing for EAs varies. Prices were as high as $0.02 per kWh before the financial crisis of
2008. Since 2008, prices on the voluntary market have varied.
For several years, there has been an effort at the federal level to implement mandatory
purchase of EAs, through creation of a renewable portfolio standard (RPS). In late 2021,
Alaska’s governor introduced a bill to establish a RPS on the electric utilities serving the Railbelt.
At the time this report is written, neither federal or in‐state RPS has been established.
Whether EAs from this project would be eligible for a federal or in‐state RPS, and what their
valuation may be remains unknown. The City should continue to monitor these efforts and if
either RPS is implemented, consider the impacts of EA sales on project economics.
While EAs from the project sold on voluntary markets are an additional potential revenue
stream for the City, the cost to “certify” the project to sell EAs could exceed the revenue from
sale of the EAs. Accordingly, no revenue from EAs is assumed in the economic evaluation.
G.2.2.4 Indirect and Nonmonetary Benefits
The recommended hydroelectric project offers significant indirect and nonmonetary benefits in
addition to direct economic benefits. These other benefits include:
● Reduced air pollution (nitrogen oxide [NOx], sulfur oxide [SOx], particulates, and
hydrocarbons) due to decreased operation of the diesel power plant.
● Reduced noise in False Pass when the diesel plant is turned off.
● Reduced risk of oil spills due to decreased throughput and handling of fuel.
● More stable energy prices. With a hydro plant, the City’s electricity rates will be more
insulated from volatile world oil prices.
● Secondary benefits arising from the availability of plentiful hydroelectricity with a stable
price. This will increase the affordability of living and doing business in False Pass and
will help to increase the long‐term viability of the community. An example of such a
secondary benefit is an increase in the population of school‐age children, helping the
community to keep the school open and ensuring that school enrollment exceeds
district and state thresholds for state funding year‐to‐year.
● Economic multipliers due to the fact that a greater percentage of electric utility
revenues will be retained in the local community for labor instead of paying external
entities such as fuel producers and suppliers.
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June 2022 – Final Report G ‐ 7
● Local training and experience with small hydroelectric projects. To the extent that local
residents choose to be involved in construction, maintenance, and operation of the
hydroelectric project, they will learn a unique set of skills. These skills will become
increasingly useful as Alaska continues to develop its local hydroelectric resources.
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June 2022 – Final Report
APPENDIX H – TECHNICAL ANALYSIS
Section Title Page Nos.
H.1 Hydro Project Analysis............................................................................. H‐2
H.2 Hydro Project Modeling........................................................................... H‐3
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report H ‐ 1
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City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report H ‐ 2
H.1 HYDRO PROJECT ANALYSIS
H.1.1 Alternatives Considered
In identifying the recommended project, Polarconsult evaluated several prospective run‐of‐
river project configurations on Unga Man Creek with diversion sites on the main stem from RM
1.4 upstream to RM 2.1 on the north fork and RM 2.75 on the south fork, and powerhouse sites
from RM 0.2 downstream of the landfill upstream to RM 1.7 on the north and south forks.
Projects in the far upstream reaches of the basin are relatively more costly due to the increased
length of access road and power line required. As these projects run into the alpine, they also
face decreasing water resource availability and more rugged terrain, which adversely effect
project performance and economics, respectively. These upstream project configurations also
provide higher head, but this advantage does not counter the other factors.
Projects in the lower reaches of the basin increasingly conflict with salmon habitat, and could
be subject to odious in‐stream flow reservations and/or operating constraints to mitigate for
impacts to fish habitat. These projects also face incrementally higher costs for longer penstocks
due to the lower creek gradient, and again longer power line extension requirements.
The recommended project layout seeks to optimize for the above and other factors, and
achieves good project performance, good economics, and good compatibility with existing
environmental resources.
H.1.2 Installed Capacity
Undersizing the hydro project would sacrifice an opportunity to support future growth of the
community at modest incremental capital expense. Oversizing the hydro project would result
in unnecessary capital expense with no benefit to the community and could also burden the
community with increased O&M expenses over the project life. The challenge in selecting the
project capacity is to weigh these considerations to arrive at an optimal project capacity.
The optimal installed capacity of the hydro project is not well‐defined by resource availability or
historic utility load trends. The recommended capacity of 180 kW provides good project
performance (maximize diesels‐off operation and reduction in diesel fuel consumption) based
on available historic utility load data.
For the recommended project layout, Unga Man Creek could sustain a project with an installed
capacity up to approximately 400 kW. There may be opportunities to serve large dispatchable
loads at the two active fish processing plants. Such loads could justify a larger installed capacity
that could improve overall project economics. Future review of this opportunity is warranted.
The economic analysis presented in Section 4 and Appendix G of this report identify a 180‐kW
project as the most economic configuration, and the technical description presented in this
section is for a project of this size. The actual installed capacity of the project, likely within the
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report H ‐ 3
100 to 400 kW range, should be finalized once permit conditions are known and discretionary
loads, project designs and cost estimates are more advanced.
With the recommended project, False Pass has an opportunity to displace a significant portion
of its heating fuel usage by using hydro project capacity to dispatch energy to community
buildings for heating purposes on an interruptible basis. The recommended project includes
provisions to supply six community buildings with dispatchable energy services to reduce
heating oil demand by approximately 8,600 gallons per year. This will require refitting these
buildings with additional electric services that can be interrupted when needed to prioritize
hydro generation capacity toward meeting electric utility needs. This will avoid unnecessary
operation of the diesel power plant to provide heat.
H.2 HYDRO PROJECT MODELING
The primary analytical tool used to evaluate various hydro project configurations and load cases
for this feasibility study is a generation dispatch model (GDM). A GDM takes in the technical
parameters of the proposed generation systems (both hydro and diesel), resource availability,
and utility loads, and then simulates operation of the proposed integrated system to determine
how a given hydro project configuration performs.
H.2.1 Generation Dispatch Model (GDM)
The GDM developed for this feasibility study runs at a one‐day time step and is used to assess
seasonal and annual variations in the performance of various project configurations. At each
time step, the model evaluates (1) utility load and (2) available water in Unga Man Creek. If
there is sufficient water to supply all of the utility load, the hydro generator is dispatched to
meet 100% of load. If additional water and generating capacity are available, this additional
energy is made available to dispatchable loads. If there is insufficient water to supply all of the
utility load, the diesel power plant is dispatched to supply all or a portion of the utility load,
consistent with safe operating limits for the diesel generators. At the next time step, this
analysis is repeated. If hydro output and utility load are closely matched, assumptions in Table
H‐1 are applied to approximate plant performance as water availability and load vary through
the day.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report H ‐ 4
Table H‐1 Intra‐Day Diesel Generator Dispatch Assumptions
Case Description
Hours per Day of
Diesel Operation
Percent
of Time3
1 Available hydro output plus governor dead band is
greater than utility peak daily demand.1,2 0 66%
2 Available hydro output is greater than utility peak daily
demand (but not greater than governor dead band). 1 1%
3 Available hydro output plus governor dead band is
between average and peak utility daily demand. 4 4%
4
Available hydro output plus governor dead band is
between 2/3rds of average utility daily demand and
average utility daily demand.
8 3%
5 Available hydro output plus governor dead band is less
than 2/3rds of average utility daily demand. 24 26%
1. Model assumes a governor dead band of 5% of utility load.
2. Average and peak daily load estimated using NREL 2002.
3. Based on 31‐year model run using extended hydrology record.
The model assumes a single crossflow turbine is installed at the hydro powerhouse. When
utility load drops below the minimum operating threshold of the turbine, interruptible loads or
a dump load at the powerhouse are energized to increase load and continue turbine operation.
When there is insufficient water to operate the turbine at minimum levels, the model shuts the
hydro project down and the utility operates in diesels‐only mode.
The GDM also monitors utility load and hydro plant availability for opportunities to dispatch
unused hydro plant capacity to dispatchable loads. To accurately evaluate these opportunities,
generalized building heating demand (considering typical building thermal envelop properties
and local climate data) was input to the model to estimate how much excess hydro energy
could be used for heating buildings and how much of a buildings’ total energy requirements
could be served by interruptible electric heating services.
H.2.2 Model Results
Figure H‐1 shows the annual variations in hydro performance over the 31‐year extended
hydrology record. Utility load was held constant from year‐to‐year for this analysis. Table H‐2
summarizes the minimum, average, and maximum amount of annual utility load supplied by
the hydro plant based on the extended record hydrology and GDM outputs. The worst
performance year (most diesel‐fired energy) was in 1999 and the best year (least diesel‐fired
energy) was 2019. 2001 was an average year.
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report H ‐ 5
Table H‐2 Expected Range of Annual Performance for Recommended Project
Expected Annual Hydro Generation (1)
Energy Performance Parameter Minimum
(1999)
Average
(2001)
Maximum
(2019)
Total Annual Utility Load Supplied by Diesel (kWh)
(Diesel as % of total supply)
242,000
(34.1%)
119,000
(16.8%)
10,000
(1.4%)
Total Annual Utility Load Supplied by Hydro (kWh)
(Hydro as % of total supply)
468,000
(65.9%)
591,000
(83.2%)
700,000
(98.6%)
Total Annual Utility Load (kWh at Generation) 710,000 710,000 710,000
Total Hydro Energy Dispatched to Supply Utility Load 468,000 591,000 700,000
Total Hydro Energy for Station Service and Load Governor 135,000 164,000 181,000
Total Gross Annual Excess Hydro Energy Available (kWh) (2) 139,000 390,000 610,000
Gross Excess Hydro Energy Dispatched to Interruptible
Heating Services (kWh) 118,000 332,000 519,000
Remaining Excess Hydro Energy (kWh) 21,000 58,000 91,000
Total Annual Hydro Generation (kWh)
(Percent of average year)
742,000
(65%)
1,144,000
(100%)
1,491,000
(130%)
NOTES:
(1) Utility load is uniform for all years in the simulation, but water availability in Unga Man Creek is based on the extended
hydrological record, and varies from year to year. The years in parentheses reflect the calendar year for the reported
project performance.
(2) Gross excess energy is the energy generated at the powerhouse before system losses are subtracted.
City of False Pass Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc. June 2022 – Final Report H ‐ 6 Figure H‐1 Annual Performance Of Recommended Hydro Project (1981 to 1985, 1996 to 2021)
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report
APPENDIX I – DRAFT REPORT REVIEW COMMENTS AND RESPONSES
City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report I ‐ 1
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City of False Pass
Unga Man Creek Hydroelectric Feasibility Study Polarconsult Alaska, Inc.
June 2022 – Final Report I ‐ 2
The City provided review comments on the client review draft of this final report on June 2,
2022. Review comments and Polarconsult responses follow.
City Comment: On page 9, the table of Large Building Inventory ‐ we would like to strike Peter
Pan Processing Plant Complex, as we do not see them as needing any power in the future (their
campus is in a state of despair currently) and increasing Silver Bay Processing Plan complex
approximate square footage up to 95,800.
Polarconsult Response: Table 2‐4 on page 9 has been revised as requested.