HomeMy WebLinkAboutBradley River Water Quality Report 1995ALASKA ENERGY AUTHORITY
BRADLEY LAKE HYDROELECTRIC PROJECT
1995 BRADLEY RIVER WATER QUALITY REPORT
Prepared with
assistance from:
Northern Ecological Services
Anchorage, Alaska
December, 1995
TABLE OF CONTENTS
Page
INTRODUCTION. . • • • • . • • • • • • • • . • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1
METHODS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RESULTS ••••••••••• . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Riffle Reach •.••
Tree Bar Reach ••
North Fork •••••••••••
Miscellaneous Data ••••
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • • ....
1
2
2
2
3
3
RECOMMENDATIONS FOR FUTURE MONITORING •••••••••••••••••••••••••• 3
REFERENCES •••••••••••••••••••• ~ • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 4
i
LIST OP FIGURES
Page
Figure 1. Datapod locations, Bradley River ••••••••••••••••••
Surface and Intragravel Water Temperature -Riffle Reach
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
December-1994 •••
January-1995 ••••
. . . . . . . . . . . . . . . . . . . . . . ..... .
February-1995 •••••••••••••••• ....... . . March-1995 ••••••
April 1995 •••••••••
May-1995 •••••••••••
June-1995 ••••
. . . . . . . . . . . . . . . ...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
July -1995 ......•........................••......
August -1995 ••
September-1995 ••••
october-1995 •••••
November 1995 •••• ~
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
December-1994 through November-1995 •••••••••••
Surface and Intragravel Water Temperature Tree Bar Reach
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
December-1994 ••••
January-1995 •••••
February-1995 ••••••
. . . . . . . . . . . . . . . . . . . . . . . . . . ........ . . . . . . . . . . . . . . . . . . . . . . . . . . .
March -1995 ••••••••••••••••••••••••••••••••••••••
April-1995 ••••••
May-1995 ••••••
June-1995 ••••••
. . . ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
July -1995 ............•..........................
August-1995 •••••••••
September-1995 •••
october-1995 •••••
November 1995 •••••••
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
December-1994 through November-1995 •••••••••••
Surface Water Temperature -North Fork
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
December-1994 •••••••
January-1995 ••••
February-1995 ••
March-1995 •• . . . . . . . . . . . . . ...... . . . . . . . . . . . . April-1995 •••••••••
May-1995 •••• .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . June-1995 •••••••••
July-1995 ••••••••
August-1995 ••••
September -1995.
October-1995 •••
November 1995 •••••
December -1994 through
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .....
November-1995 •••••• .....
ii
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
LIST OF TABLES
Table 1. Surface water temperature and turbidity measurements
collected during the Salmon Escapement Monitoring
Page
study downstream from Riffle Reach ••••••••••••••••••• 45
iii
INTRODUCTION
The purpose of this report is to comply with Article 3 3 of the
Federal Energy Regulatory Commission (FERC) License which states
that a water quality monitoring program must be developed to
evaluate water temperatures in the lower Bradley River particularly
as they may be related to the production of fish resources.
The monitoring program was developed and presented in the Bradley
Lake mitigation plan published in November 1985 (Alaska Energy
Authority, 1985). This is the tenth and final annual progress
report and covers water quality data collected during the period -
December 1994 through November 1995.
Information presented includes intragravel and surface water
temperatures at two sites in the lower Bradley River and surface
water temperatures in the North Fork of the Bradley River. Also
included are surface water temperature and turbidity measurements
collected at the Bradley River fish camp by the fisheries study
crew during the July to September period.
The Bradley Lake Hydroelectric facility began operation in the fall
of 1991 and was operational during the period of this study •
. Discharge volumes in the Bradley River during the 1995 water
quality monitoring period were characteristic of operational flows.
This annual report is the fifth to report on water quality during
the operational flow regime.
METHODS
Surface and intragravel water temperatures continued to be
collected at two-hour intervals utilizing Model DP212 omnidata
Datapod digital recorders as described in the 1988 Annual Water
Quality Report (Alaska Power Authority, 1988). Figure 1 depicts
the locations of the temperature stations.
The datapods were serviced at approximately monthly intervals.
some variation in servicing interval occurred because of weather
limitations. The longest period between servicing was
approximately 5 weeks. At each servicing, the datapod surface
temperature reading was compared with a reading obtained from a
hand held thermometer in open water near the surface probe; during
some of the winter readings, ice cover prevented use of the hand
held thermometer.
Additional surface water temperature and turbidity data were
collected during the mid-July to mid-September period by field
personnel associated with the Salmon Escapement Monitoring study.
This information was collected at the fish camp which is about 150
ft. downstream from the Tree Bar Reach datapod station.
1
Temperature and turbidity readinqs were usually collected at about
9:00 am.
RESULTS
The intragravel and surface water temperature data for December
1994 throuqh November 1995 are presented in graphic form by month
and by study site. An annual graph has also been produced for each
study site. The monthly graphs were prepared usinq a computer
proqram which plots each of the 2 hour temperature readinqs
obtained from the datapods. Temperature readinqs that were
obviously erroneous due to datapod malfunction or freezinq of the
probes were filtered out of the data prior to plottinq. The annual
graphs were prepared by computinq the averaqe daily temperature
from the 12 daily temperature readinqs and plottinq the averaqe
daily temperature for each day of the December to November period.
Complete printouts of the data are not presented here due to their
bulk, but are available upon request from the Alaska Energy
Authority.
Riffle Reach
The record for the Riffle Reach intragravel probe is complete
except for a period in late January. The record for the surface
water probe contains several qaps includinq most of December and
January and parts of October and November. The data qaps appeared
to be due to datapod malfunction.
Graphs of the surface and intraqravel water temperatures for the
months December, 1994 throuqh November, 1995 are presented in
Fiqures 2 throuqh 13 and the annual temperature record is presented
in Fiqure 14.
Inspection of the graphs for the open water period shows that the
amplitude of diurnal temperature fluctuation was nearly the same
for the surface and intraqravel temperatures. Since intraqravel
temperatures normally show substantially less daily variation than
surface temperatures, it is suspected that the intraqravel probe
was actually measurinq surface temperature. The probe may have
been partially pulled up by floatinq ice or erosion around the
probe may have exposed it to surface flow. comparison of surface
water temperatures as measured by the datapods with temperatures
measured by the hand held thermometer sugqest that the surface
probe was reqisterinq temperatures that were about 0.9 degrees c.
too high for most of the year. Temperatures reqistered by the
intraqravel probe were close to those measured by the hand held
thermometer and, thus, the "intraqravel" temperatures probably
represent a reasonably accurate record of surface water
temperature.
2
Tree Bar Reach
The temperature record for Tree Bar Reach is complete except for
a datapod malfunction which affected the intragravel temperature
record for part of August. The temperature record for Tree Bar
reach in 1995 is considered to be reliable and accurate to within
1 degree c.
Graphs of the surface and intragravel water temperature for the
months December through November are presented in Figures 15
through 26 and the annual temperature record for the full period
December through November is presented in Figure 27.
Nortb Fork of tbe Bradley River
The-temperature record for the North Fork is complete except for
late March and late November when the probe was evidently frozen.
The temperature record for the North Fork in 1995 is considered to
be reliable and accurate to within 1 degree c.
Graphs of the surface water temperature for the months December
through November are presented in Figures 28 through 39 and the
annual record is presented in Figure 40.
Miscellaneous Data
Surface water temperature and turbidity data collected during the
1995 Salmon Escapement Monitoring Program at the fish camp near
Tree Bar Reach are presented in Table 1.
RECOHIIEHDATIONS FOR FUTURE MONITORING
The 1995 temperature year (December 1994 -November 1995) is the
last year of required temperature monitoring per the monitoring
program presented in the Bradley Lake Hydroelectric Project
Mitigation Plan. Maintenance of the temperature monitoring
stations has been costly because of the remote location, and the
accuracy and consistency of the data were marginal. Data
reliability was especially difficult to maintain during winter
weather conditions due to the combined effects of cold, snow,
moisture, and freezing of temperature probes. It is recommended
that collection of data from the three datapod temperature
monitoring stations be discontinued. ·
The U.s. Geological Survey currently maintains a temperature
monitoring station within Tree Bar Reach. This station collects
both surface and intragravel temperatures using procedures very
similar to the stations described in this report. The USGS plans
to continue maintaining this station at least until 1998. The
station is located within a known salmon spawning area and will
provide representative information relative to temperature impacts
3
on fish resources. The USGS temperature monitoring station will
be adequate for future impact analysis.
It is currently planned to prepare an analytical summary report in
early 1.986 which compares pre-operational and post-operational
stream temperatures and addresses the possible impact any such
changes might have had on Bradley River fish populations.
REFERENCES
Alaska Power Authority, 1.985. Mitigation Plan for the Bradley Lake
Hydroelectric Project. Prepared by Stone & Webster Engineering
Corporation.
Alaska Power Authority, 1.988. Bradley River Water Quality Report -
1.988. Bradley lake Hydroelectric Project, Federal Energy
· Regulatory Commission Project No. P-8221..
4
IRACI.EY RIVER SYSTEW
e '.ISCS CiACi'ING SUTIQN
A CATAPOO
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FIGURE 2. RIFFLE REACH-DECEMBER, 1994
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2:.---------------------------------------------------------------------------------~
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15
DECEMBER-1994
,-=--SURFACE TEMPERATURE . .=::=-INTRAGRAVElTEMP.----I
30
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FIGURE 3. RIFFLE REACH-JANUARY, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2~----------------------------------------------------------------------------~
1 .................................................................................................. _ ........................................................................................................................................................................................................................................... ..
1-+-···--···-··-···---·----·--····-----··-··-----·-···--··--·-···-·-·---···---------~
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15 20
JANUARY -1995
1-.SURFACETEMPERATURE~~:=~~INTRAGMVEL-TEMp:-··~ I
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FIGURE 4. RIFFLE REACH-FEBRUARY, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
3.------------------------------------------------------------------------------,
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5 15
FEBRUARY-1995 _
20
1-SURFACE ~fEMPERATURE -·-····=li.iTRAGRAVEL TEMP:---]
25
0 m
FIGURE 5. RIFFLE REACH-MARCH, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2.5-·································-···--··-·················-·-··--··-···--.......................................................... _, _______ , ................................... ., ......................................................... -.. -............................................................ .
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5 10 15 20 30
MARCH -1995
,_ SURFACE TEM-PERATuR-E-==--· .... INTRAGRAVELTEMP. I
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FIGURE 6. RIFFLE REACH-APRIL, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
6!.-----------------------------------------------------------------------------------~
1
10 15
APRIL-1995
1-SURFACE TEMPERATURE-············ INrAI\GRAvEL TEMP.--J
30
FIGURE 8. RIFFLE REACH-JUNE, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
11.---------------------------------------------------------------------------------~
1 o-f ............... -............................. -....................................... -............... " ................................. ~ .................... -................... ,~r· .. -1 .......................................................................... . ...... f ~~ ........................................ .
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15
JUNE -1995
F SURFACE TEMPERATtTRE .............. INTRAGRAVEL TEMP. I
I
FIGURE 7. RIFFLE REACH-MAY, 1995
SURFACE & INTRAGRAVELWATER TEMPERATURE
7.----------------------------------------------------------r--------------------------~
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MAY~ 1995
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FIGURE 9. RIFFLE REACH-JULY, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
1~-------------------------------------------------------------------------------------,
1 A-t·····-·················-··-············-·-·····-···-·····················-············-··-····-···-·--· .. ·····-·-·················-·················-··-·-············-····-···-···•·+···-··········-·····-·········-···-··········-······················-···········-···-·············-······
,\
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E SURFACETEMPERATURf=·::~=··· INTRAGRAVELTEMP.--J
1"" -
FIGURE 10. RIFFLE REACH-AUGUST, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
12-1-·····························-·····-··························-···-···························-···-·····-····-················-····-··-······················-·-···--····-··--·····-·-···-···-·-·····-····-···········-····-···-··-···················-····-··--···-·········-·····-
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30
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FIGURE 11. RIFFLE REACH-SEPTEMBER, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
11.-------------------------------------------------------------------------------~
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1 5 10 15 20 25 30
SEPTEMBER ~ 1995
-SURFACE TEMPERATURE .............. INTRAGRAVEL TEMP.
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FIGURE 12. RIFFLE REACH-OCTOBER, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
8-t·····-····-·····l·+·································--····-·····-······ .. ·--·······-····························-······"··············-· .. ·······-···-······-··--······················--·················-·································-· .. ························································ .................. .
5 10 15
OCTOBER -1995
f-SURFACETEMPE-RATURE ........ _. INTRAGRAVELTEMP.----J
FIGURE 13. RIFFLE REACH-NOVEMBER, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
6,-----------------------------------------------------------------------------------~
l .
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1 5 15
NOVEMBER-1995
F SURFACE-TEMPERATURE:::= ......... INTRAGRAVfLTEMP.-n~ J
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FIGURE 14: RIFFLE REACH -1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
14~----------~----------------------------------------------~
12-~·······························-···········-·····-··-·--·····--······-···········-·-·····-····---······-····-·-···························-···-·-··-··-····-·······--·+·~-· .. ··-·····-··-··········-·····-··············-·····-········-···················-·················-··
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DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV
DECEMBER, 1994 THROUGH NOVEMBER, 1995
r=-sURFACE-TEMPERATURE ..... ~:.=~~ INTRAGAAVEL~TEMP. . j
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FIGURE 15. TREE BAR REACH-DECEMBER, 1994
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2:.-------------------------------------------------------------------------------~
1.:>-1-···-···········-·········-·····-··--····-··-·-··-·-·-·-··-···-····-··············-··········-····-··········-········-···········-···-····--······-········-··-·····-···-····--·-···-·····-··-····-···--··············-·····-··········· .. ··-····-···················
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1 5 10 15 20 ----
DECEMBER -1994
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FIGURE 16. TREE BAR REACH-JANUARY,1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
2:.-------------------------------------------------------------------------------~
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JANUARY -1995
,_SURFACE TEMPERATURE ........... ~:. -iNfRAGRAVELTEMP:' ____ ]
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FIGURE 17. TREE BAR REACH-FEBRUARY,1995
SURFACE & INTRAGRAVELWATER TEMPERATURE
2'.-------------------------------------------------~------------------------------~
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SURFACE & INTRAGRAVEL WATER TEMPERATURE
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1 5 10 15 20 25 30
MARCH -1995
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FIGURE 19. TREE BAR REACH-APRIL, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
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APRIL-1995
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FIGURE 20. TREE BAR REACH-MAY, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
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MAY -1995 r=-SURFACETEi,,-PERATURE .......... ~ ... INTRAGAAVELTEMP. -I
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FIGURE 21. TREE BAR REACH-JUNE, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
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SURFACE & INTRAGRAVEL.WATER TEMPERATURE
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1 5 10 15 20 25
JULY -1995
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FIGURE 23. TREE BAR REACH-AUGUST, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
141-----------------------------------------------------------------------------,
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AUGUST -1995
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FIGURE 24. TREE BAR REACH-SEPT., 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
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1 5 10 15
SEPTEMBER -1995
r=--SlJRFACETEMPE-RATliRE-.:.-=: .. ~=: iNTRAGRAVEL TEMP.
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FIGURE 25. TREE BAR REACH-OCTOBER, 1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
7.---------------------------------~------------------------------------------------,
·JT~-.. ·1·-··;t~-............................ -......................... ··--·············--········-··-·······--·········-····-·····-·--··--···--············-·····················-······················-··-····-···-·········································-·············-····-·····-···················
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1 5 10 15 20 25 30
OCTOBER -1995
F SURFACETE-MPERATURE--=-~: .. :=-·iNTRA-GRAVEL TEMP. I
FIGURE 26. TREE BAR REACH-NOVEMBER,1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
4.-----------------------------------------------------------------------------~
3 .5-<·l······-·············-····--····----·---··········--······--··-····--·····--·-···--·----··--·····-·-····---·········---····--···--·····--·--·--····--···--·················--······--··--····--······---··-·--····--··-····--···--··--·--···----····--·····························-···---··--·----·········--·--·····--
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NOVEMBER-1995
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FIGURE 27: TREE BAR REACH -1995
SURFACE & INTRAGRAVEL WATER TEMPERATURE
12.-----------------------------------------------------------~
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DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT . NOV
. DECEMBER, 1994 THROUGH NOVEMBER, 1995
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FIGURE 28. NORTH FORK-DECEMBER, 1994
SURFACE WATER TEMPERATURE
2:.---------------------------------------------------------------------------------.
1 ......................................................... _ . ._ .... -......................................................................................................................................................................................................................................................................... .
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DECEMBER -1994
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FIGURE 29. NORTH FORK-JANUARY, 1995
SURFACE WATER TEMPERATURE
2.-----------------------------------------------------------------------------------~
1. ~-··········································--···············-···········-····-····-·········-·······-·······-·················"···········-··-·-·-···· .. -·····-····-.. ··-····-··-······-···--··-·--·-···-····--···--···---··· .. ··-······-····-····-···········-· .. ·-··········--·--···-
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1 5 10 15 20 25 --
JANUARY-1995
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FIGURE 30. NORTH FORK-FEBRUARY, 1995
SURFACE WATER TEMPERATURE
2:.---------------------------------------------------------------------------~
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15
FEBRUARY -1995
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FIGURE 31. NORTH FORK-MARCH, 1995
SURFACE WATER TEMPERATURE
2'.---------------------------------------------------------------------------------.
1. -······-····-···········-·····-···············-···················-·········--·····················································-····-··················-··········-·······················-····-····--····-·········--················-················-························-·"·-·········-·-··-
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1 10 15 20 25
MARCH -1995
r==-suRFAC-ETEMPEAATURE I
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TABLE 1
Surface water temperature and turbidity measurements collected
during the Salmon Escapement Monitoring Study downstream from Tree
Bar Reach.
~ Water Temperature (c.) Turbidity <NTYl
July 19 8.8 40
July 20 10.0 32
July 25 8.4 24
July 26 8.0 28
July 27 7.2
Aug. 1 9.0 24
Aug. 2 9.2 27
Aug. 3 8.6 38
Aug. 8 9.0 46
Aug. 9 9.2 40
Aug. 10 7.6 38
Aug. 15 7.0 10
Aug. 16 7.0 6
Aug. 17 8.8 22
Aug. 22 8.2 40
Aug. 23 8.0 40
Aug. 24 9.2 34
Aug. 29 10.0 38
Aug. 30 9.0 34
Aug. 31 8.0 30
sep. 5 9.5 32
Sep. 6 10.0 26
Sep. 7 9.5
Sep. 12 8.2
Sep. 13 8.8 40
Sep. 14 7.0
45