HomeMy WebLinkAboutSuWa234Alaska Resources Library & Information Services
Susitna-Watana Hydroelectric Project Document
ARLIS Uniform Cover Page
Title:
SuWa 234
Eulachon run timing, distribution, and spawning in the Susitna River (Study
9.16), 2015 proposed eulachon spawning habitat study modifications,
technical memorandum
Author(s) – Personal:
Author(s) – Corporate:
R2 Resource Consultants, Inc.
AEA-identified category, if specified:
September 17, 2014 technical memorandum filings
AEA-identified series, if specified:
Series (ARLIS-assigned report number): Existing numbers on document:
Susitna-Watana Hydroelectric Project document number 234
Published by: Date published:
[Anchorage, Alaska : Alaska Energy Authority, 2014] September 2014
Published for: Date or date range of report: Prepared for Alaska Energy Authority
Volume and/or Part numbers:
Final or Draft status, as indicated:
Attachment F
Document type: Pagination:
Technical memorandum ii, 9 p.
Related work(s): Pages added/changed by ARLIS:
Cover letter to this report: Susitna-Watana Hydroelectric
Project, FERC Project no. 14241-000; Initial filing of September
2014 technical memoranda. (SuWa 228)
Attachments A-E and G-J (SuWa 229-233 and 235-238)
Added cover letter
Notes:
All reports in the Susitna-Watana Hydroelectric Project Document series include an ARLIS-
produced cover page and an ARLIS-assigned number for uniformity and citability. All reports
are posted online at http://www.arlis.org/resources/susitna-watana/
September 17, 2014
Ms. Kimberly D. Bose
Secretary
Federal Energy Regulatory Commission
888 First Street, N.E.
Washington, D.C. 20426
Re:Susitna-Watana Hydroelectric Project, Project No. 14241-000
Initial Filing of September 2014 Technical Memoranda
Dear Secretary Bose:
By letter dated January 28, 2014, the Federal Energy Regulatory Commission
(Commission or FERC) extended the procedural schedule for the preparation and review
of the Initial Study Report (ISR) for the proposed Susitna-Watana Hydroelectric Project,
FERC Project No. 14241 (Project).1 In particular, the Commission’s January 28 letter
established a deadline of June 3, 2014 for the Alaska Energy Authority (AEA) to file the
ISR, and provided a 120-day period for licensing participants to review the ISR prior to
the ISR meetings, which are scheduled to begin the week of October 13.2 The purpose of
this filing is to provide several technical memoranda to Commission Staff and licensing
participants prior to the ISR meetings.
As required by the Commission’s January 28 letter, AEA filed the ISR with the
Commission on June 3. Among other things, the ISR detailed AEA’s planned work
during the 2014 field season.3 As AEA was preparing this 2014 work plan, it recognized
that data gathered during the 2014 field season, together with other study work conducted
prior to the October 2014 ISR meetings,could assist Commission Staff, AEA, and other
licensing participants in developing the Project’s licensing study program for 2015. For
this reason, the ISR provided for AEA to prepare certain technical memoranda and other
information based on 2014 work.
AEA recognizes that Commission Staff and licensing participants need a
reasonable amount of time prior to the ISR meetings to review this additional
information. AEA and licensing participants consulted with Commission Staff on this
1 Letter from Jeff Wright, Federal Energy Regulatory Commission, to Wayne Dyok, Alaska Energy
Authority, Project No. 14241-000 (issued Jan. 28, 2014)[hereinafter, “January 28 letter”].
2 The full schedule for the ISR meetings appears in Section 1.5 of the ISR, as well as on AEA’s
licensing website, http://www.susitna-watanahydro.org/meetings/.
3 E.g., Initial Study Report §1.3 & Table 3, Project No. 14241-000 (filed June 3, 2014) [hereinafter,
“ISR”].
2
matter, and Staff directed that any additional information should be filed with the
Commission and made available to licensing participants no later than 15 days prior to
the ISR meetings, consistent with the typically applicable deadline under the
Commission’s Integrated Licensing Process regulations.4
With this letter, AEA is filing and distributing the first set of technical
memoranda and other information generated during the 2014 study season, as described
below. As part of its continued implementation of the study plan, AEA expects to file
certain additional technical memoranda prior to October 1, 2014, in accordance with
Commission Staff direction.
This first set of technical memoranda and other information consists of the
following:
Attachment A: Proposal to Eliminate the Chulitna Corridor from Further
Study. As explained in the ISR, throughout the licensing process AEA has
continually evaluated its proposal for Project development based on
environmental review, technical feasibility, practical considerations, and other
factors. As part of this iterative process, AEA notified the Commission and
licensing participants in the ISR that it was evaluating whether to continue
study of the Chulitna Corridor.5 Attachment A details AEA’s conclusion that
development of the Chulitna Corridor is not a reasonable alternative, and
therefore AEA proposes to eliminate the corridor from further study. AEA
seeks any comments or information on this proposal from federal and state
resource agencies and other participants in the licensing process.
Attachment B: Ice Processes in the Susitna River Study (Study 7.6),Detailed
Ice Observations October 2013 –May 2014 Technical Memorandum. The
ISR indicated that AEA would provide a summary of the 2014 break-up
observations.6 This technical memorandum describes all field activities and
observations between October 16, 2013 and May 15, 2014 for the Ice
Processes in the Susitna River Study (Study 7.6).
Attachment C: Study of Fish Distribution and Abundance in the Upper
Susitna River (Study 9.5), Proposed 2015 Modifications to Fish Distribution
and Abundance Study Plan Implementation Technical Memorandum. Based
on AEA’s experience in implementing the study plan for the Study of Fish
Distribution and Abundance in the Upper Susitna River (Study 9.5)during
2014, this technical memorandum proposes to continue certain modifications
to the implementation of this study during 2015.
4 See 18 C.F.R. §5.15(c)(2).
5 See ISR, ISR Overview §1.4.
6 See id., Ice Processes in the Susitna River Study,Study Plan 7.6, Part C §7.2.
3
Attachment D: Study of Fish Distribution and Abundance in the Middle and
Lower Susitna River Study (Study 9.6), 2013-2014 Winter Fish Study
Technical Memorandum. At the time the ISR was filed, AEA was still in the
process of conducting data entry, quality control, and analysis of winter
sampling for this study. AEA reported in the ISR that it would develop plans
for completing this study in a technical memorandum to be filed with the
Commission.7 This technical memorandum fulfills this commitment and sets
forth AEA’s proposal for winter efforts, including proposed methodologies
and modifications.
Attachment E: Characterization and Mapping of Aquatic Habitats (Study
9.9), 2013 and 2014 Aquatic Habitat Mapping Field Season Completion
Progress Technical Memorandum. In the ISR, AEA reported that its 2014
activities for the Characterization and Mapping of Aquatic Habitats Study
(Study 9.9) would consist of various ground-truthing surveys and collection of
habitat information for the 12 lakes within the potential reservoir inundation
zone.8 This technical memorandum reports on these activities.
Attachment F: Eulachon Run Timing, Distribution, and Spawning in the
Susitna River (Study 9.16), 2015 Proposed Eulachon Spawning Habitat Study
Modifications Technical Memorandum.After reviewing the 2013 and 2014
results from the Cook Inlet Beluga Whale Study (Study 9.17) and discussing
the results with the National Marine Fisheries Service, AEA has determined
that additional data are needed regarding eulachon spawning habitats. This
technical memorandum describes a proposed modification to the Study of
Eulachon Run Timing, Distribution and Spawning in the Susitna River (Study
9.16)to include an assessment of eulachon spawning habitats.
Attachment G: Fish and Aquatics Instream Flow Study (Study 8.5),
Evaluation of Relationships between Fish Abundance and Specific
Microhabitat Variables Technical Memorandum. Consistent with the
Commission’s study plan determination,9 this technical memorandum
provides a detailed evaluation of the comparison of fish abundance measures
with specific microhabitat variable measurements where sampling overlaps.
This memorandum is used to determine whether a relationship between a
specific microhabitat variable and fish abundance is evident.
Attachment H: Fish and Aquatics Instream Flow Study (Study 8.5), 2013-
2014 Instream Flow Winter Studies Technical Memorandum.In the ISR,
AEA reported that it would distribute its finding concerning the 2013-2014
7 See id., Study of Fish Distribution and Abundance in the Middle and Lower Susitna River Study,
Study Plan 9.6, Part C §7.1.2.5.
8 See id., Characterization and Mapping of Aquatic Habitats, Study Plan 9.9, Part C § 7.1.
9 See Study Plan Determination on 14 Remaining Studies for the Susitna-Watana Hydroelectric Project,
Appendix B at B-84 to B-86, Project No. 14241-000 (issued Apr. 1, 2013).
4
winter activities in 2014.10 This technical memorandum describes the
methods applied, and data and information collected, as part of the Instream
Flow Study 2013-2014 winter studies.
Attachment I: Geomorphology Study (Study 6.5), Susitna River Historical
Cross Section Comparison (1980s to Current) Technical Memorandum. As
specified in Revised Study Plan Section 6.5.4.1.2.3, this technical
memorandum describes changes within the main and side channels of the
Susitna River by comparing historical survey data from the 1980s with survey
data from the current Project.
Attachment J: Geomorphology Study (Study 6.5), 2014 Update of Sediment-
Transport Relationships and a Revised Sediment Balance for the Middle and
Lower Susitna River Segments Technical Memorandum. The purpose of this
technical memorandum is to update the sediment load rating curves and
preliminary estimates of the overall sediment balance in the Middle and
Lower River segments under pre-Project conditions that were initially
provided in “Development of Sediment-Transport Relationships and an Initial
Sediment Balance for the Middle and Lower Susitna River Segments,” (Tetra
Tech, Inc. 2013a). This update is based on additional data collected by the
U.S. Geological Survey in 2012 and 2013.
AEA appreciates the opportunity to provide this additional information to the
Commission and licensing participants, which it believes will be helpful in determining
the appropriate development of the 2015 study plan as set forth in the ISR. If you have
questions concerning this submission please contact me at wdyok@aidea.org or (907)
771-3955.
Sincerely,
Wayne Dyok
Project Manager
Alaska Energy Authority
Attachments
cc: Distribution List (w/o Attachments)
10 See ISR, Fish and Aquatics Instream Flow Study, Study Plan 8.5, Part C §7.5.2.
Susitna-Watana Hydroelectric Project
(FERC No. 14241)
Eulachon Run Timing, Distribution, and Spawning
in the Susitna River (Study 9.16)
2015 Proposed Eulachon Spawning Habitat
Study Modifications
Technical Memorandum
Prepared for
Alaska Energy Authority
Prepared by
R2 Resource Consultants, Inc.
September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
TABLE OF CONTENTS
1. Introduction ........................................................................................................................1
2. Approach to Eulachon Spawning habitat ........................................................................1
2.1. Previous Spawning Data Collection ..................................................................1
2.2. Eualchon Spawning Locations ...........................................................................2
2.3. Eulachon Spawning Habitat Model ...................................................................2
2.3.1. Previous Eulachon Spawning Habitat Model ................................................... 2
2.3.2. Proposed Eulachon Spawning Habitat Model .................................................. 3
3. Literature Cited .................................................................................................................4
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page i September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
LIST OF ACRONYMS AND SCIENTIFIC LABELS
Abbreviation Definition
ADF&G Alaska Department of Fish and Game
AEA Alaska Energy Authority
cfs cubic feet per second
CIBW Cook Inlet Beluga Whale
ISR Initial Study Report
km kilometer
m meter
NMFS National Marine Fisheries Service
PRM Project River Mile
RSP Revised Study Plan
SPD Study Plan Determination
USR Updated Study Report
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page ii September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
1. INTRODUCTION
In 2013, AEA’s study teams conducted the first year of data collection for the Study 9.16
Eulachon Run Timing, Distribution and Spawning in the Susitna River. Sampling and telemetry
work in the Lower River supported all four objectives of the study as described in RSP Section
9.16 (AEA 2012). Because eulachon is an important prey species for Cook Inlet Beluga Whale
(CIBW) this study has been designed also to support the CIBW study (Study 9.17). After further
discussion with National Marine Fisheries Service (NMFS) regarding 2013 and 2014 CIBW
study results additional data were deemed necessary focusing on confirming eulachon spawning
habitats and evaluating the potential for the Project to affect eulachon spawning habitat. This
technical memorandum describes a proposed modification to the Study 9.16 Eulachon Run
Timing, Distribution and Spawning in the Susitna River that is intended to fill the identified
eulachon habitat data gap in support of Study 9.17 CIBW.
2. APPROACH TO EULACHON SPAWNING HABITAT
2.1. Previous Spawning Data Collection
Previous studies by the Alaska Department of Fish and Game (ADF&G) of eulachon spawning
in 1982 and 1983 concluded that the largest concentrations of eulachon migrations in the Susitna
River were found downstream of the Yentna River confluence (Barrett et al. 1984). ADF&G
researchers documented two separate eulachon runs entering the Susitna River. During 1982, the
first run occurred from May 16 to May 30, with the second run occurring from June 1 to June 8.
During 1983, the first run occurred from May 10 to May 18, with the second run occurring from
May 19 to June 6 (Vincent-Lang and Queral 1984). Approximately 70 percent of the first and
second migration spawning areas were located between about PRM 15 and PRM 31.
ADF&G researchers observed eulachon entering the intertidal reach in schools during high tide
events. Once through the intertidal reach, eulachon schools migrated upstream along the shore
where there was direct flow. When eulachon encountered areas that were stagnant or had low
velocity, they moved offshore to stay within the current. In both years, major spawning occurred
near cut banks and riffle areas with loose sand and gravel substrates. Eulachon were not
observed spawning in clearwater sloughs or tributaries. A total of 61 separate eulachon
spawning areas were identified in the Susitna River main channel in 1983. At least six of the
areas were used for spawning by fish in both the first and second migrations. In 1983, the first
migration eulachon spawning areas were located in moderate velocity areas near cut banks where
the riverbed composition was mainly loose sands and gravels. The surface velocity at these sites
ranged from 1 to 2 feet per second and depths averaged 4.3 ft. The second eulachon spawning
migration had at least seven times as many fish as the first migration and fish used a wider range
of habitats. Researchers at the time assumed that the much larger second migration caused
crowding and forced second migration fish to use less preferred spawning habitats (Barrett et al.
1984). Several instances of what appeared to be crowding-related mortality were observed with
large drifts of carcasses of unspawned eulachon up to 4 ft deep.
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 1 September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
During 2013, surveys were conducted at 28 eulachon spawning habitat sites in the mainstem
Lower River. Physical characteristics collected to describe spawning habitat included substrate
type, velocity and depth. These data were presented in Initial Study Report (ISR) for Study 9.16
in Section 5.3.2. Spawning sites surveyed in 2013 had characteristics similar to spawning habitat
previously described by ADF&G (Barrett et al. 1984). These 2013 spawning surveys provide a
basis for expansion with the 2015 surveys and habitat model development.
2.2. Eualchon Spawning Locations
In 2013, AEA utilized radio telemetry, visual observations, and multibeam sonar to identify
potential eulachon spawning locations (See ISR Section 9.16.4.4.1; AEA 2014) and based on the
result of that effort is proposing a modification to eulachon distribution data collection for 2015.
After review of the 2013 spawning distribution data, AEA determined that the radio telemetry
results identified potential spawning locations (Figure 2.2-1a 7 2.2-1b) within the known
distribution of eulachon spawning from the 1980s (Figure 2.2 -2) and consistent with visual and
sonar observations in 2013 (Figure 2.2 -2). Thus, the radio telemetry component of the study,
which required additional effort, did not provide additional information on potential spawning
locations. Further, radio signals are not detectable in saline environments and would not be
suitable for detection of potential spawning in the lower, likely intertidal, reach of the Susitna
River. Because AEA does not think another year of radio telemetry data will further inform the
eulachon study objectives, AEA proposes to eliminate the radio telemetry study component in
2015.
In lieu of radio telemetry, AEA is proposing additional visual and sonar surveys to identify
potential spawning locations in the lower, likely intertidal, reach of the eulachon spawning
distribution (PRM 6-11) that was not surveyed in 2013. No data is currently available on
eulachon spawning in that stretch of the Lower River. However, eulachon spawning and
presence below PRM 11 is of interest to help inform the Cook Inlet Beluga Whale Study 9.17
(AEA 2012). AEA proposes to use the visual and sonar methods as described in RSP Section
9.16 (AEA 2012) to complete these surveys in 2015.
2.3. Eulachon Spawning Habitat Model
2.3.1. Previous Eulachon Spawning Habitat Model
During 1983, habitat surveys were conducted at 20 eulachon spawning sites between
approximately PRM 13 and PRM 23 to characterize habitat and environmental parameters
associated with eulachon spawning (Barrett et al. 1984). A representative sub-sample of the
surveyed spawning sites was chosen for additional analysis to determine whether physical habitat
conditions that were present at the time of spawning might exist at different mainstem
discharges. At each of five study sites, two representative transects were selected for streambank
surveys during the spawning run. The transect bed was profiled from a point on the bank above
high water out into the channel to a water depth of about 5 ft. The surficial substrate
composition along each transect was visually estimated and recorded. Representative
measurements of water depth and velocity were then recorded during subsequent site visits to
collect data over a range of mainstem flows.
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 2 September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
The range of depths and velocities recorded at known Susitna River eulachon spawning areas
during active spawning suggested that variations in mainstem flow had little effect on the
availability of acceptable depths and velocities at eulachon spawning sites. ADF&G researchers
concluded “that acceptable substrates and hydraulic conditions persist along these shoreline
margins for mainstem discharges between 35,000 and 105,000 cfs” (Vincent-Lang and Queral
1984). Although the results of their investigations indicated that variations in mainstem
discharge between 35,000 and 105,000 cubic feet per second (cfs) had little effect on the
suitability of suitable spawning areas, other factors, such as water temperature and shoreline
stability, should also be considered.
2.3.2. Proposed Eulachon Spawning Habitat Model
AEA proposes to measure transects at known eulachon spawning areas to determine whether the
streambank geometry and substrate provide acceptable spawning conditions at a range of flows
in the Lower Susitna River. The 1980s studies used empirical observations and measurements
during the 1982 and 1983 eulachon spawning periods. In an effort to extend study results to a
range of flows lower than what might be experienced during the 2015 spawning period, a
transect-based modeling approach, based on an adaptation of Wetted-Perimeter instream flow
methods (Leathe and Nelson 1986), will be used. Four transects will be selected in the Lower
River below the Yentna River confluence in eulachon spawning areas. To the extent practical,
transects will be co-located at areas where high-density eulachon spawning was observed in
1982, 1983, and 2013 as well.
The Wetted-Perimeter method assumes that there is a direct relation between the wetted
perimeter along a transect and fish habitat. The wetted perimeter of a stream, defined as the
width of the streambed and stream banks in contact with water for an individual cross section, is
used as a measure of the availability of aquatic habitat over a range of discharges (Leathe and
Nelson 1986). Wetted perimeter transect lengths, transect water depths, and discharge data are
collected at a site over a range of flow conditions to generate a wetted-perimeter - discharge
curve. Typical application of the method involves plotting the wetted perimeter of a riffle over a
range of flows and determining the inflection point. The flow represented by the inflection point
is assumed to protect the food-producing riffle habitats at a level sufficient to maintain the
existing fish population at some acceptable level of sustained production. Instead of assuming
that an inflection point provides an acceptable level of protection, the results of the proposed
analysis will be used to compare flows during the May and June eulachon spawning period under
pre- and post-Project conditions.
Two types of data collection are necessary for the proposed analysis. The first includes transect-
specific measurements collected at high, medium, and low flow conditions to cover the range of
flows observed during the May and June eulachon spawning period. The second includes
installation of pressure transducers recording stage in 15-minute increments over the length of
the field effort. Transect measurements will include bed, bank, and water surface elevations tied
into the Project datum, and characterization of surficial substrate at each transect near eulachon
spawning areas. The following three field efforts are proposed:
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 3 September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
1. During May and June, efforts will include transect selection, installation of the pressure
transducers, and site specific transect measurements of bathymetry, water surface
elevation, and surficial substrate;
2. July field efforts will collect water surface elevation data under assumed moderate flow
conditions; and
3. September low-flow field efforts will include collection of water surface elevation data,
verification of substrate data collected during the May and June field effort, and removal
of the pressure transducers. Measurement of low-flow conditions during September is
expected to provide information on stage changes in the Lower River that may occur
under proposed Project operations in May and June.
The pressure transducer data, coupled with stage information available for the Susitna River at
Susitna station (USGS No. 15294350), will be used to identify flow travel times between the
Susitna Station location and the selected transects. This travel time information will be used to
adjust the pre- and post-Project streamflow modeling results estimated using the Open-water
Flow Routing model results available at PRM 29.9, downstream to the location of the selected
transects (see ISR Study 8.5, Appendix K). Streamflow data at the transects of interest under
pre- and post-Project conditions will be coupled with the transect bathymetry data to develop
wetted perimeter-discharge relationships for each transect.
To evaluate potential Project-related effects, the transect-based method will be used to quantify
and compare the availability of water depths and spawning-sized substrate along the banks of
each transect during the May and June eulachon spawning period under pre- and post-Project
conditions. In addition, changes in wetted perimeter that maintain a minimum water depth over
areas of suitable spawning-sized substrates will be plotted against mainstem flow to identify a
breakpoint or threshold (CDFW 2013). The breakpoint will define the flow below which aquatic
habitat conditions for spawning eulachon rapidly decline and will represent the minimum
mainstem flow needed to protect suitable spawning habitat. The results of the 2015 eulachon
spawning habitat study will be presented in the Updated Study Report (USR).
3. LITERATURE CITED
Alaska Energy Authority (AEA). 2012. Revised Study Plan: Susitna-Watana Hydroelectric
Project FERC Project No. 14241. December 2012. Prepared for the Federal Energy
Regulatory Commission by the Alaska Energy Authority, Anchorage,
Alaska. http://www.susitna-watanahydro.org/study-plan.
Barrett, B.M., F.M. Thompson, and S.N. Wick. 1984. Adult Anadromous Fish Investigations:
May-October 1983, Report No. 1. Alaska Department of Fish and Game, Susitna Hydro
Aquatic Studies, Anchorage, Alaska, prepared for Alaska Power Authority, Document
No. 1450.
CDFW (California Department of Fish and Wildlife). 2013. Standard Operating Procedure for
the Wetted Perimeter Method in California. California Department of Fish and Wildlife
Instream Flow Program Standard Operating Procedure DFG-IFP-004, 19 p.
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 4 September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
Leathe, S.A., and F.A. Nelson. 1986. A literature evaluation of Montana's wetted perimeter
inflection point method for deriving instream flow recommendations: Helena, MT,
Department of Fish, Wildlife, and Parks, 70 p.
Vincent-Lang, D. and I. Queral. 1984. Aquatic Habitat and Instream Flow Investigations: May-
October 1983, Report No. 3, Eulachon Spawning Habitat in the Lower Susitna River.
Alaska Department of Fish and Game, Susitna Hydro Aquatic Studies, Anchorage,
Alaska, prepared for Alaska Power Authority, Document No. 1934.
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 5 September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
4. FIGURES
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 6 September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
Figure 2.2 – 1a. Potential spawning sites of eulachon in the Susitna River in 2013, based on
radio telemetry detections, Map 1 of 2 (from ISR 9.16).
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 7 September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
Figure 2.2 – 1b. Potential spawning sites of eulachon in the Susitna River in 2013, based on
radio telemetry detections, Map 2 of 2 (from ISR 9.16).
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 8 September 2014
2015 PROPOSED EULACHON SPAWNING
TECHNICAL MEMORANDUM HABITAT STUDY MODIFICATIONS
Figure 2.2-2. Location of historic eulachon spawning sites (blue) and spawning sites surveyed in
2013 (purple) by Project River Mile (from ISR 9.16).
Susitna-Watana Hydroelectric Project Alaska Energy Authority
FERC Project No. 14241 Page 9 September 2014