U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
OXBW RESEWOIR
BAKER COUNTY, OREGON
ADAMS GOUMY, IDAHO
EPA REGION X
WORKING PAPER No, 832
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
OXBOW RESEfMHR
BAKER COUNTY, OREGON
ADAMS GOIMIY, IDAHO
EPA REGION X
WORKING PAPER No, 832
WITH THE COOPERATION OF THE
OREGON DEPARTMENT OF ENVIRONMENTAL QUALITY,
THE IDAHO DEPARTMENT OF HEALTH AND WELFARE,
AND THE OREGON NATIONAL GUARD
M«CH, 1978
-------
CONTENTS
Foreword i i
List of Oregon Lakes and Reservoirs iv
Lake or Reservoir Drainage Area Map v
Secttons
I, Conclusions 1
II . Drainage Basin Characteristics 4
III. Water Quality Summary 5
IV. Nutrient Loadings 9
V. Literature Reviewed . 13
VI. Appendices 14
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11
FOREWORD
The National Eutrophication Survey was initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concentrations,
and impact on selected freshwater lakes as a basis for formulating
comprehensive and coordinated national, regional, and state management
practices relating to point-source discharge reduction and non-point
source pollution abatement in lake watersheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts that:
a. A generalized representation or model relating
sources, concentrations, and impacts can be constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized model
can be transformed into an operational representation of
a lake, its drainage basin, and related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and water-
shed data collected from the study lake and its drainage basin is
documented. The report is formatted to provide state environmental
agencies with specific information for basin planning [§303(e)J, water
quality criteria/standards review [§303(c)j, clean lakes [§314(a,b)J,
and water quality monitoring [§106 and §305(b)] activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.
-------
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
fresh water lakes. Likewise, multivariate evaluations for the
relationships between land use, nutrient export, and trophic
condition, by lake class or use, are being developed to assist
in the formulation of planning guidelines and policies by EPA
and to augment plans implementation by the states.
ACKNOWLEDGEMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Oregon Department of
Environmental Quality and the Idaho Department of Health and
Welfare for professional involvement and to the Oregon National
Guard for conducting the tributary sampling phase of the Survey.
William H. Young, Director; Harold L. Sawyer, Administrator,
and the staff of the Water Quality Control Division of the Oregon
Department of Environmental Quality; and the staff of the Division
of Environment of the Idaho Department of Health and Welfare
provided invaluable lake documentation and counsel during the
Survey, reviewed the preliminary reports, and provided critiques
most useful in the preparation of this Working Paper series.
Brigadier General Richard A. Miller, the Adjutant General
of Oregon, and Project Officer Lt. Colonel John Mewha, who directed
the volunteer efforts of the Oregon National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.
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IV
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES and RESERVOIRS
STATE OF OREGON
NAME COUNTY
Brownlee Baker, OR; Washington, ID
Diamond Douglas
Hells Canyon Baker, Wallowa, OR; Adams,
Idaho, ID
Hills Creek Lane
Owyh.ee Malhuor
Oxbow . Baker, OR; Adams, ID
Suttle Jefferson
Waldo Lane
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11655
06A1/03A2
outlet
OXBOW RESERVOIR
<8> Tributary Sampling Site
X Lake Sampling Site
1234
1 ScaTe 2
3 Mi
\02
4455-
Ore.
Map Location
3B1
•^^f
J06A2
Dam
'"••\ Brownlee
?•'•''] Reservoir
4450-
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OXBOW RESERVOIR
STORE! NO. 4106
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate Oxbow Reservoir is eutrophic. It
ranked sixteenth in overall trophic quality when the 21
Oregon and Idaho lakes and reservoirs sampled in 1975 were
compared using a combination of six water quality parameters*.
Seventeen of the water bodies had less median total phosphorus
and dissolved orthophosphorus, all of the others had less
median inorganic nitrogen, 13 had less mean chlorophyll a^,
and 14 had greater mean Secchi disc transparency. Some depression
of dissolved oxygen with depth occurred at stations 1 and 2
in August and September.
Survey limnologists did not observe surface concentrations
of algae; however, the relatively high chlorophyll a^ concen-
tration at station 2 in April is indicative of a near-bloom con-
dition (see page 7).
B. Rate-Limiting Nutrient:
The algal assay results are not considered representative of
conditions in the reservoir at the time the samples were collected
(09/15/75).
The reservoir data indicate phosphorus limitation in April
but nitrogen limitation in August and September.
* See Appendix A.
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2
C. Nutrient Controllability:
1. Point sources—No known point sources directly impacted
Oxbow Reservoir during the sampling year. However, those point
sources contributing nutrients to upstream Brownlee Reservoir*
probably affect Oxbow Reservoir as well, since 54% of the phos-
phorus input to Brownlee Reservoir was not retained and entered
Oxbow Reservoir.
The sampling year phosphorus loading of 183.51 g/m2 is over
20 times that proposed by Vollenweider (Vollenweider and Dillon,
1974) as a eutrophic loading (see page 12). Although Vollenweider's
model may not be applicable to water bodies with short hydraulic
retention times, the trophic condition of Oxbow Reservoir is
evidence of excessive nutrient loads. Any improvement in water
quality would require minimization of the nutrient loads from
both non-point sources and the point sources impacting upstream
Brownlee Reservoir.
2. Non-point sources—As considered in this report, "non-point"
sources include those contributing nutrients as a result of human
activities (e.g., agricultural practices, urbanization, extractive
processes, etc.) as well as natural sources (i.e., direct precipi-
tation, leaf fall, wild birds and animals, etc.).
The apparent non-point source phosphorus contribution accounted
for all of the total phosphorus load during the sampling year. How-
ever, as stated above, part of this load is attributable to point
* Working Paper No. 827.
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3
sources further upstream.
The Snake River contributed 99.0% of the total phosphorus
load, and the Wildhorse River contributed 0.6%. The ungaged
minor tributaries and immediate drainage contributed an esti-
mated 0.4%.
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II. RESERVOIR AND DRAINAGE BASIN CHARACTERISTICS7
A. Morphometry :
1. Surface area: 5.66 kilometers2.
2. Mean depth: 11.4 meters.
3. Maximum depth: 38.1 meters.
4. Volume: 64.758 x 106 m3.
5. Mean hydraulic retention time: 1 day.
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Name
Snake River
Wildhorse River
Minor tributaries &
immediate drainage -
Drainage
area (km2)*
188,033.9
458.4
312.9
Totals 188,805.2
2. Outlet -
Snake River
C. Precipitation****:
1. Year of sampling: 27.0 centimeters.
2. Mean annual: 27.3 centimeters.
Mean flow
(m3/sec)*
526.270
4.920
1.470
532.660**
188,810.9*** 532.660
t Table of metric equivalents—Appendix B.
tt McHugh, 1972; Martin and Hanson, 1966.
* For limits of accuracy, see Working Paper No. 175, "...Survey Methods,
1973-1976".
** Sum of inflows adjusted to equal outflow.
*** Includes area of reservoir.
**** See Working Paper No. 175.
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5
III. WATER QUALITY SUMMARY
Oxbow Reservoir was sampled three times during the open-water
season of 1975 by means of a pontoon-equipped Huey helicopter. Each
time, samples for physical and chemical parameters were collected from
a number of depths at three stations on the reservoir (see map, page v).
iDuring each visit, a single depth-integrated (4.6 m to surface) sample
was composited from the stations for phytoplankton identification and
enumeration; and during the September visit, a single 18.9-liter depth-
integrated sample was collected from each of the stations for chlorophyll
^analysis. The maximum depths sampled were 29.3 meters at station 1,
34.7 meters at station 2, and 12.5 meters at station 3.
The sampling results are presented in full in Appendix D and are
summarized in the following table.
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A. SUMMARY OF PHYSICAL AND
CHEMICAL CHARACTERISTICS FOR
STORET CODE 4106
OXBOH! RESERVOIR
PARAMETER
TEMP (C)
OISS OXY (MG/L)
CNDCTVY (MCROMO)
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/L)
ORTHO P (MG/L)
N02+N03 (MG/L)
AMMONIA (MG/L)
KJEL N (MG/L)
INORG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A (UG/D
SECCHI (METERS)
1ST SAMPLING ( 4/
3 SITES
RANGE MEAN
6.9 - 7.6 7.3
15.2 - 15.6 15.5
237. - 247. 240.
8.4 - 8.5 8.5
129. - 134. 131.
0.074 - 0.087 0.080
0.024 - 0.051 0.036
0.640 - 0.660 0.645
0.040 - 0.060 0.052
0.300 - 0.500 0.385
0.680 - 0.720 0.697
0.940 - 1.150 1.030
13.3 - 23.0 18.0
0.5 - 0.8 0.7
9/75)
2ND SAMPLING ( 8/ 4/75)
3 SITES
3RD SAMPLING ( 9/15/75)
3 SITES
MEDIAN
7.4
15.6
239.
8.4
131.
0.081
0.037
0.640
0.050
0.400
0.700
1.040
17.7
0.7
RANGE
17.7
2.8
233.
8.1
95.
0.036
0.012
0.160
0.020
0.200
0.180
0.460
3.4
0.4
- 23.9
9.2
- 281.
8.9
- 102.
- 0.057
- 0.043
- 0.360
- 0.040
- 0.300
- 0.380
- 0.660
8.7
3.2
MEAN
20.3
6.0
257.
8.4
99.
0.048
0.032
0.300
0.027
0.250
0.327
0.550
5.7
2.3
MEDIAN
20.3
5.8
261.
8.4
101.
0.050
0.034
0.300
0.030
0.250
0.335
0.540
5.0
3.2
RANGE
20.9
4.0
417.
8.0
151.
0.065
0.063
0.670
0.020
0.200
0.690
0.890
6.1
2.4
- 21.8
8.6
- 426.
8.2
- 171.
- 0.096
- 0.067
- 0.710
- 0.070
- 0.500
- 0.780
- 1.210
8.5
3.4
MEAN
21.2
4.9
420.
8.1
162.
0.074
0.065
0.691
0.023
0.269
0.714
0.960
7.2
2.7
MEDIAN
21.1
4.6
419.
8.1
166.
0.072
0.064
0.690
0.020
0.250
0.710
0.940
7.1
2.4
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B.
Biological characteristics:
1.
Phytoplankton -
Sampling
Date
04/09/75
08/04/75
09/15/75
Domi nant
Genera
1. Stephanodiscus sp.
2. Asterionella sp/
3. Melosira sp.
4. Surirella sp.
5. Chroomonas (?) sp.
Other genera
Total
1 . Fragilaria sp'.
2. Stephanodiscus S£.
Total
1. Melosira SJD.
2. Cyclotella sp.
3. Cryptomonas sp.
Algal Units
„ per ml
5,621
300
257
'43
43
44
6,308
433
31
464
807
70
35
2. Chlorophyll a_ -
Sampling
Date
04/09/75
08/04/75
09/15/75
Total
Station
Number
1
2
3
1
2
3
1
2
3
912
Chlorophyll a
13.3
23.0
17.7
8.7
5.0
3.4
7.1
8.5
6.1
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8
C. Limiting Nutrient Study:
The algal assay results are not considered representative
of conditions in the reservoir at the time the sample was col-
lected (09/15/75) due to significant changes in the nutrient
levels in the sample during shipment from the field to the
laboratory.
The reservoir data indicate phosphorus limitation in April
and, nitrogen limitation in August and September. The mean inor-
ganic nitrogen/orthophosphorus ratios in April were 14/1 or
greater at'all stations and were 12/1 or less at all stations
in August and September.
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IV. NUTRIENT LOADINGS
(See Appendix E for data)
For the determination of nutrient loadings, the Oregon National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page v), except for the high
runoff month of February when two samples were collected. Sampling
was begun in October, 1974, and was completed in September, 1975.
Through an interagency agreement, stream flow estimates for the
year of sampling and-a "normalized" or average year were provided by
the Oregon District Office of the U.S. Geological Survey for the
tributary sites nearest the reservoir.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of a U.S. Geological Survey com-
puter program for calculating stream loadings*. Nutrient loads for
unsampled "minor tributaries and immediate drainage"1 ("ZZ" of U.S.G.S.)
were estimated using the nutrient loads at station B-l, in kg/kmVyear,
and multiplying by the ZZ area in km2.
i
No known wastewater treatment plants directly impacted Oxbow
Reservoir during the sampling year.'
* See Working Paper No. 175.
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10
A, Waste Sources:
1. Known municipal - None
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
kg P/ % of
Source yr total
a. Tributaries (non-point load) -
Snake River 1,023,210 98.5
Wildhorse River 9,075 0.9
b. Minor tributaries & immediate
drainage (non-point load) - 6,260 0.6
c. Known municipal STP's - None.
d. Septic tanks - None
e. Known industrial - None -
f. Direct precipitation* - 100 < O.t.
Total 1,038,645 100.0
2., Outputs -
Reservoir outlet - Snake River 895,060
3. Net annual P accumulation - 143,585 kg.
* See Working Paper No. 175.
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11
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source yr total
a. Tributaries (non-point load) -
Snake River 18,218,785 98.6
Wildhorse River 151,760 0.8
b. Minor tributaries & immediate
drainage (non-point load) - 103,570 0.6
c. Known municipal STP's - None
d. Septic tanks - None
e. Known industrial - None
f. Direct precipitation* - 6,110 < 0.1
Total 18,480,225 100.0
2. Outputs -
Lake outlet - Snake River 25,222,530
3. Net annual N loss - 6,742,305 kg.
D. Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr kg N/km2/yr
Snake River 5 97
Wildhorse River 20 331
* See Working Paper No. 175.
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12
E. Yearly Loads:
In the following table, the existing phosphorus loadings
are compared to those proposed by Vollenweider (Vollenweider
and Dillon, 1974). Essentially, his "dangerous" loading is
one at which the receiving water would become eutrophic or
remain eutrophic; his "permissible" loading is that which
would result in the receiving water remaining oligotrophic
or becoming oligotrophic if morphometry permitted. A meso-
trophic loading would be considered one between "dangerous"
and "permissible".
Note that Vollenweider's model may not be applicable to
water bodies with short hydraulic retention times.
Total Phosphorus Total Nitrogen
Total Accumulated Total Accumulated
grams/mVyr 183.51 25.37 3,265.1 loss*
Vollenweider phosphorus loadings
(g/m2/yr) based on mean depth and mean
hydraulic retention time of Oxbow Reservoir:
"Dangerous" (eutrophic loading) 9.00
"Permissible" (oligotrophic loading) 4.50
* There was an apparent loss of nitrogen during the sampling year. This
may have been due to nitrogen fixation in the reservoir, solubilization
of previously sedimented nitrogen, recharge with nitrogen-rich ground
water, unsampled point sources discharging directly to the reservoir,
or (probably) insufficient outlet sampling in relation to the very
short hydraulic retention time of the reservoir. Whatever the cause,
a similar nitrogen loss has occurred at Shagawa Lake, Minnesota, which
has been intensively studied by EPA's former National Eutrophication and
Lake Restoration Branch (Malueg et al., 1975).
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13
V. LITERATURE REVIEWED
Malueg, Kenneth W., D. Phillips Larsen, Donald W. Schults, and
Howard T. Mercier; 1975. A six-year water, phosphorus, and
nitrogen budget for Shagawa Lake, Minnesota. Jour. Environ.
Qual., vol. 4, no. 2, pp. 236-242.
Martin, R. A. R., and Ronald L. Hanson, 1966. Reservoirs in the
United States. Water Supply Paper No. 1838, U.S. Geol. Surv.,
Wash., DC.
McHugh, Robert A., 1972. Interim study of some physical, chemical,
and biological properties of selected Oregon lakes. OR Dept.
of Environ. Qua!., Portland.
Vollenweider, R. A., and P. J. Dillon, 1974. The application of
the phosphorus loading concept to eutrophication research.
Natl. Res. Council of Canada Publ. No. 13690, Canada Centre
for Inland Waters, Burlington, Ontario.
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VI. APPENDICES
14
APPENDIX A
LAKE RANKINGS
-------
LAKE DATA TO BE USED IN BANKINGS
LAKE
CODE LAKE NAME
1601 AMERICAN FALLS RESERVOIR
1603 CASCADE LAKE
1603 LAKE COEUR D'ALENE
1604 OWORSHAK RESERVOIR
1605 MAUSER
1606 HAYOEN LAKE
1607 ISLAND PARK RESERVOIR
1608 LAKE LOWELL
1609 MAGIC RESERVOIR
I6lu PALISADES RESERVOIR
1611 LOWER PAYETTE
1612 LOwfER TWIN LAKES
1613 UPPER TWIN LAKES
4101 8ROWNLEE RESERVOIR
4102 DIAMOND LAKE
4103 HELLS CANYON RESERVOIR
4104 HILLS CREEK RESERVOIR
4105 O'-VYHEE
4106 OXBOW RESERVOIR
4107 SUTTLE LAKE
4108 WALDO LAKE
MEDIAN
TOTAL P
0.105
0.032
0.017
0.010
0.028
0.010
0.034
0.070
0.062
0.024
0.013
0.016
0.017
0.079
0.028
0.068
0.038
0.095
0.071
0.031
0.005
MEDIAN
INORG N
0.080
0.060
0.040
0.080
0.075
0.040
0.050
0.070
0.130
0.080
0.060
0.050
0.045
0.560
0.040
0.640
0.060
•0.425
0.690
0.04Q
0.040
500-
MEAN SEC
463.800
415.067
380.348
401.866
366.286
243.500
391.778
477.111
400.750
345.428
234.000
370.000
369.143
428.133
294.500
429.111
435.200
480.417
425.555
95.000
-100.000
MEAN
CHLORA
15.379
8.081
10.391
2.420
11.112
2.787
9.322
25.389
7.322
2.067
4.600
2.318
34.962
16.207
7.300
18.722
2.333
3.350
10.311
9.167
0.350
15-
MIN DO
14.700
14.600
12.200
7.^00
14.800
11.800
12.800
14.600
14.700
12.800
9.600
13.600
8.200
14.500
6.800
12.400
7.400
13.200
12.200
6.800
6.800
MEu>I
OISS OKI
0.035
0.009
O.OOb
0.009
0.013
0.003
0.012
0.015
0.020
0.007
0.007
0.009
0.0 Of
0.0<+3
0.011
0.045
0.027
0.064
0.040
0.020
G.OG6
-------
PERCENT or LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE"
CODE LAKE NAME
1601 AMERICAN FALLS RESERVOIR
1602 CASCADE LAKE
1603 LAKE COEUfi O'ALENE
1604 OWORSHAK RESERVOIR
1605 HAUSER
1606 HAYDEN LAKE
1607 ISLAND PARK RESERVOIR
1608 LAKE LOWELL
1609 MAGIC RESERVOIR
1610 PALISADES RESERVOIR
1611 LOWER PAYETTE
1612 LOWER TWIN LAKES
1613 UPPER TWIN LAKES
4ioi BROWNLEE: RESERVOIR
4102 DIAMOND LAKE
4103 HELLS CANYON RESERVOIR
4104 KILLS CREEK RESERVOIR
410'5 OWYHEE
4106 OXBOW RESERVOIR
4107 SUTTLE LAKE
4108 WALOlPLAKE
MEDIAN
TOTAL P
0 ( 0) '
45 (
75 (
93 (
58 (
93 (
40 (
20 <
30 <
65 (
85 <
80 (
70 (
10 (
58 (
25 (
35 <
5 (
15 <
50 (
100 (
9)
15)
18)
ID
18)
8)
4)
6)
13)
17)
16)
14)
2)
11)
5)
7)
1)
3)
10)
20)
MEDIAN
INORG N
30 ( 5)
58 1
93 1
30 i
40 <
93 1
68 1
45 1
20 1
30 1
58 I
68 1
75 1
10 <
93 1
5 1
50 1
15 1
0 I
80 (
93 <
I 11)
; 17)
[ 5)
[ 8)
: 17)
! 13)
; 9)
! 4)
1 S)
I 11)
[ 13)
! 15)
I 2)
! 17)
[ 1)
I 10)
: 3)
; o)
[ 16)
! 17)
500-
MEAN SEC
10 ( 2)
35 (
55 <
40 (
70 (
85 (
50 (
5 (
45 (
75 (
90 (
60 (
65 (
25 (
80 <
20 (
15 (
0 (
30 (
95 (
100 (
7)
11)
8)
14)
17)
10)
1)
9)
15)
18)
12)
13)
5)
16)
4)
3)
0)
6)
19)
20)
MEAN
CHLORA
20 ( 4)
50
30
80
25
75
40
5
55
95
65
90
0
15
60
10
85
70
35
45
100
( 10)
( 6)
( 16)
( 5)
( 15)
< 8)
( 1)
< ID
< 19)
( 13)
( 18)
( 0)
( 3)
( 12)
( 2)
( 17)
( 14)
( 7)
( 9)
( 20)
15- MEDIAN
MIN 00 DISo OKTMO P
13 (2) 20 ( 4)
3 (
58 (
83 <
3 <
65 (
43 (
20 (
13 (
43 (
70 (
30 (
75 (
25 (
95 (
50 (
83 (
35 (
58 (
95 (
95 (
0)
11)
16)
0)
13)
8)
4)
2)
8)
14)
6)
15)
5)
18)
10)
16)
7)
ID
18)
18)
65 (
90 (
65 (
45 (
100 (
50 (
40 (
30 (
80 (
75 (
65 (
95 (
10 (
55 (
5 (
25 (
, 0 <
15 (
35 (
85 (
12)
18)
12)
9)
20)
10)
8)
6)
16)
15)
12)
19)
2)
11)
1)
5)
0)
3)
7)
17)
IND£X
NO
i
93 i
256
401
391
241
511
291
135
193
388
4-f3
393
380
*5
441
115
2*3
125
lo3
400
573
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LAKES RANKED BY INDEX NOS.
RANK LAKE CODE LAKE NAME
INDEX NO
1 4103 WALDO LAKE 573
2 1606 HAYOElM LAKE 511
3 1611 LOWER PAYETTE 443
4 4102 DIAMOND LAKE 441
5 1603 LAKE COEUR O'ALENE 401
6 4107 SUTTLE LAKE 4CO
7 1612 LOWER TWIN LAKES 393
s 1604 DW/ORSHAK RESERVOIR 391
9 i6io PALISADES RESERVOIR 388
10 1613 UPPER TWIN LAKES 380
11 4104 HILLS CREEK R£SERv6lR 293
12 1607 ISLAND PARK RESERVOIR 291
13 1602 CASCADE LAKE ?56
14 1605 HAUSER 241
15 1609 MAGIC RESERVOIR 193
16 4106 OXBOW RESERVOIR 153
17 1608 LAKE LOWELL 135
18 4105 OWYHEE - 125
19 4103 HELLS CANYON RESERVOIR '115
20 4101 8ROWNLEE RESERVOIR 95
21 1601 AMERICAN PALLS RESERVOIR 93
-------
APPENDIX B
CONVERSION FACTORS
-------
CONVERSION FACTORS -
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles.
Meters x 3.281 = feet
Cubic meters x 8.107 x 10 "^ = acre/feet
Square kilometers x 0.3861 = square miles
Cubic meters/sec x 35.315 - cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 = Ibs/square mile
-------
APPENDIX C
TRIBUTARY FLOW DATA
-------
TRIdUTAkY FLOW INFORMATION FOR OREGON
08/11/76
LAKE CODE 4106
ox BOW RESERVOIR
TOTAL DRAINAGE AREA OF LAKE(SO KM) 188810.9
FE8 MAR APR
SUB-DRAINAGE
TRIBUTARY AREAfSQ KM)
JAN
MAY
NORMALIZED FLOWS(CMS)
JUN JUL AUG
SEP
OCI
NOV
UEC
MEAN
4106A1
4106A2
4106H1
4106ZZ
188810.9
188033.9
458.4
89.1
597.V* 713.58 676.77 716.42 634.30 620.14 336.97 325.64 396.44 447.41 444.57 501.21 532.66
594.65 710.75 671.11 707.92
2.27 2.1> 5.10 6.51
0.42 0.51 0.68 0.79
614.48
15.57
2.41
600
15
1
.32
.57
.42
331.31
4.25
0.68
322.61
1.42
0.23
396.44
0.99
0.17
444.57
1.42
0.20
441
2
0
.74
.27
.23
498.38
1.42
0.23
526.27
4.92
0.66
SUMMARY
TOTAL DRAINAGE AREA OF LAKE =
SUM OF SUB-DRAINAGE AREAS =
188810
188581
.9
.4
TOTAL FLOW IN =
TOTAL FLOW OUT =
6401.
6410.
27
92
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR MEAN FLOW DAY
4106A1
FLOW DAY
FLOW DAY
FLOW
4106A2
10
11
1?
1
?
3
4
5
6
7
a
9
10
11
12
1
?
3
4
5
6
7
8
9
74
74
74
75
75
75
75
75
75
75
75
75
74
74
74
75
75
75
75
75
75
75
75
75
501.208
495.545
523.862
614.476
719.248
877.822
1268.595
1347.882
733.406
413.426
328.475
444.574
498.376
492.713
523.862
614.476
719.248
872.159
1260.100
1328.060
719.243
407.762
325.644
444.574
19
23
14
4
9
9
13
17
7
9
28
19
23
14
4
9
9
13
17
7
9
28
410.594
521.030
538.020
620.139 25
569.168 22
897.644
1155.327
82.119
744.733
311.485
430.416
410.594
521.030
538.020
617.307 25
569.168 22
889.149
1149.664
51.537
722.080
308.654
430.416
656.951
894.812
656.951
891.980
-------
TRIBUTARY FLOW INFORMATION FOR OREGON
08/11/76
LAKE CODE 4106 OX BOW RESERVOIR
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR MEAN FLOW DAY
4106B1
10
11
12
1
?
3
4
5
6
7
8
9
74
74
74
75
75
75
75
75
75
75
75
75
FLOW DAY
0.850
0.566
0.623
0.708
1.416
5.360
5.947
17.556
12.743
4.531
1.076
0.793
19
23
14
4
9
9
13
17
7
9
28
0.906
0.623
0.623
0.623
0.991
8.495
5.663
25.485
18.406
0.708
0.566
25
22
FLOW DAY
0.850
1.189
FLOW
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORET RETRIEVAL DATE 76/08/12
410^01
44 58 07.0 116 50 02.0 3
OXBOW RESERVOIR
41001 OREGON
130892
11EPALES 2111202
0064 FEET DEPTH CLASS 00
DATE
FROM
TO
75/04/09
75/08/04
75/09/15
DATE
FROM
TO
75/04/09
75/08/0*.
75/09/15
TIME DEPTH
OF
DAY FEET
10 00 0000
10 00 0005
10 00 0015
10 00 0035
10 00 0060
09 00 0000
09 00 0005
09 00 0015
09 00 0035
09 00 0070
09 00 0096
15 00 0000
15 00 0005
15 00 0015
15 00 0035
15 00 0065
15 00 0096
TIME DEPTH
OF
DAY FEET
10 00 0000
10 00 0005
10 00 0015
10 00 0035
10 00 0060
09 00 0000
09 00 0005
09 00 0015
09 00 0035
09 00 0070
09 00 0096
15 00 0000
15 00 0005
15 00 0015
15 00 0035
15 00 0065
15 00 0096
00010
WATER
TEMP
CENT
6.9
7.1
7.1
7.0
7.0
23.9
22.2
21.1
20.6
20.0
19.2
21.6
21.0
21.0
20.9
20.9
20.9
00665
PHOS-TOT
MG/L P
0.087
0.084
0.074
0.079
0.079
0.036
0.040
0.040
0.042
0.051
0.055
0.073
0.069
0.071
0.072
0.096
0.085
00300 00077 00094
00 TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
15.4 27
15.6
15.2
15.6
15.4
9.2 126
7.6
5.6
6.0
4.8
5.8
5.6 96
8.6
4.5
4.2
4.3
4.0
32217 00031
CHLRPHYL INCDT LT
A REMNING
UG/L PERCENT
13.3
8.7
7.1
247
239
239
240
243
281
275
269
265
249
241
426
419
417
417
417
420
00400
PH
SU
8.
8.
8.
8.
8.
a.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.
SO
45
40
45
45
90
70
40
35
15
65
20
10
10
10
10
10
00410 00610 00625 00630 00671
T ALK NH3-N TOT KJEL N02&N03 PHOS-DIS
CAC03 TOTAL N N-TOTAL ORTHO
MG/L MG/L MG/L MG/L MG/L P
132
131
130
129
129
101
102
102
101
97
96
167
166
165
165
166
166
0.050
0.040
0.050
0.040
0.050
0.020
0.030
0.030
0.020
0.030
0.030
0.020K
0.020K
0.020K
0.020K
0.070
0.020K
0.400
0.400
0.400
0.400
0.400
0.300
0.300
0.300
0.200
0.200
0.300
0.200
0.200
0.200
0.200
0.500
0.200
0.650
0.640
0.640
0.640
0.640
0.160
0.240
0.280
0.300
0.320
0.350
0.690
0.700
0.700
0.710
0.710
0.710
0.033
0.037
0.042
0.039
0.040
0.012
0.019
0.027
0.029
0.034
0.037
0.067
0.065
0.066
0.066
0.066
0.067
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE! RETRIEVAL DATE 76/08/12
410602
44 56 10.0 116 49 58.0 3
OXttOw RESERVOIR
41001 OREGON
130892
11EPALES
2111202
0094 FEET DEPTH CLASS 00
DATE
FROM
TO
75/04/09
75/08/04
75/09/15
DATE
FROM
TO
TIME DEPTH
OF
DAY FEET
10 25 0000
10 25 0005
10 25 0015
10 25 0050
10 25 0090
09 30 0000
09 30 0005
09 30 0015
09 30 0030
09 30 0060
09 30 0090
09 30 0114
15 20 0000
15 20 0005
15 20 0015
15 20 0035
15 20 0070
15 20 0101
TIME DEPTH
OF
DAY FEET
00010
WATER
TEMP
CENT
7.2
7.5
7.5
7.4
7.4
21.7
21.7
21.0
20.8
19.9
19.5
19.5
21.8
21.5
21.3
21.1
21.1
21.1
00665
PHOS-TOT
MG/L P
00300
DO
MG/L
15.6
15.6
15.6
15.4
15.6
8.0
4.4
3.0
2.8
7.0
5.3
5.2
5.1
4.9
4.6
4.5
32217
CHLRPHYL
A
UG/L
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
30 239
239
238
239
239
126 273
275
270
265
257
247
247
96 423
423
419
418
418
419
00031
INCDT LT
REMNING
PERCENT
00400
PH
SU
8.
8.
8.
8.
8.
a.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.
8.
50
50
50
45
45
60
60
40
35
20
10
55
20
20
20
10
10
00
00410
T ALK
CAC03
MG/L
129
130
129
134
132
101
101
100
97
99
99
101
165
166
169
169
171
154
00610
00625
NH3-N TOT KJEL
TOTAL
Mii/L
0.060
0.050
0.060
0.060
0.050
0.030
0.040
0.040
0.030
0.030
0.020
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
N
MG/L
0.300
0.400
0.400
0.300
0.400
0.300
0.300
0.200K
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.300
0.300
0.400
00630
N02&N03
N-TOTAL
MG/L
0.650
0.640
0.650
0.660
0.650
0.280
0.270
0.300
0.330
0.330
0.340
0.300
0.690
0.690
0.690
0.670
0.690
0.690
00671
PHOS-DIS
OHTHO
MG/L P
0.041
0.044
0.051
0.033
0.028
0.034
0.037
0.039
0.036
0.035
0.035
0.030
0.063
0.063
0.063
0.064
0.065
0.067
K VALUF KNOWN TO BF
75/04/09
75/08/04
75/09/15
10 25 0000
10 25 0005
10 25 0015
10 25 0050
10 25 0090
09 30 0000
09 30 0005
09 30 0015
09 30 0030
09 30 0060
09 30 0090
09 30 0114
15 20 0000
15 20 0005
15 20 0015
15 20 0035
15 20 0070
15 20 0101
0.081
0.082
0.085
0.081
0.081
0.042
0.043
0.041
0.055
0.051
0.051
0.057
0.071
0.073
0.076
0.074
0.078
0.085
23.0
5.0
8.5
LESS THAN
INDICATED
-------
STORET RETRIEVAL DATE 76/08/12
DATE
FROM
TO
75/04/09
75/08/04
75/09/15
TIME
OF
DAY
11 00
11 00
11 00
10 05
10 05
10 05
16 40
16 40
16 40
16 40
DEPTH
FEET
0000
0005
0015
0000
0005
0013
0000
0005
0017
0041
tfATER
TEMP
CENT
7.5
7.6
7.4
17.7
17.8
17.8
21.2
21.2
21.2
21.2
410603
44 51 23.0 116 53 25.0 3
OXBOW RESERVOIR
41001 OREGON
130892
11EPALES 2111202
0019 FEET DEPTH CLASS 00
00010
ATER
TEMP
CENT
7.5
7.6
7.4
17.7
17.8
17.8
21.2
21.2
21.2
21.2
00300
DO
MG/L
15.6
15.2
15.2
8.8
5.4
5.8
4.6
4.6
4.6
4.5
00077
TRANSP
SECCHI
INCHES
20
17
132
00094
CNDUCTVY
FIELD
M1CROMHO
237
237
238
233
235
233
420
420
421
419
00400
PH
SU
8.45
8.45
8.50
8.55
8.20
8.10
8.15
8.20
8.20
8.10
00410
T ALK
CAC03
MG/L
131
132
132
102
97
95
153
154
151
151
00610
NH3-N
TOTAL
MG/L
0.050
0.060
0.050
0.020
0.020
0.020
0.020K
0.020K
0.020K
0.020K
00625
TOT KJEL
N
MG/L
0.500
0.300
0.400
0.300
0.300
0.200
0.300
0.300
0.300
0.300
00630
N02«*N03
N-TOTAL
MG/L
0.650
0.640
0.640
0.280
0.360
0.360
0.680
0.680
0.680
0.680
00671
PHOS-OIS
ORTHO
MG/L P
0.024
0.029
0.026
0.025
0.042
0.043
0.063
0.063
0.064
0.063
DATE
FROM
TO
75/04/09
75/08/04
75/09/15
TIMF DEPTH
OF
DAY FEET
11 00 0000
11 00 0005
11 00 0015
10 05 0000
10 05 0005
10 05 0013
16 40 0000
16 40 0005
16 40 0017
16 40 0041
00665
PHOS-TOT
MG/L P
0.076
0.075
0.079
0.049
0.053
0.056
0.068
0.065
0.065
0.067
32217
CHLRPHYL
A
UG/L
17.7
3.4
6.1
00031
INCDT LT
REMNING
PERCENT
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
APPENDIX E
TRIBUTARY DATA
-------
STOfiET RETRIEVAL DATE 76/08/12
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/19 12 50
74/11/23 12 30
75/01/25 14 22
75/02/09 14 50
75/02/22 15 35
75/05/17 14 00
75/06/07 13 00
75/08/09
75/09/28 11 00
4106A1
44 58 30.0 116 51 15.0 4
SNAKE RIVER
41 15 COPPERFIELO
0/OX BOW RESERVOIR 130892
BRDG BELOW OXBOW POWERHOUSE
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
I&N03
OTAL
IG/L
0.800
0.960
0.810
0.750
0.720
0.070
0.055
0.300
0.620
00625
TOT KJEL
N
MG/L
1.400
0.400
0.500
1.100
0.400
0.750
1.300
1.850
0.500
00610
NH3-N
TOTAL
MG/L
0.055
0.035
0.056
0.072
0.044
0.030
0.030
0.050
0.025
00671
PHOS-DIS
ORTHO
MG/L P
0.065
0.050
0.016
0.024
0.016
0.010
0.010
0.030
0.050
00665
PHOS-TOT
MG/L P
0.075
0.050
0.030
0.050
0.040
0.090
0.060
0.060
0.070
-------
STORET RETRIEVAL OA1E 7b/6s/i3
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/19
74/11/33
74/13/14
75/02/09
75/02/22
75/03/09
75/04/13
75/05/17
75/06/07
75/09/28
14 30
12 00
13 30
11 15
12 00
12 00
10 55
11 35
12 25
4106A2
44 50 45.0 116 53 45.0 4
SNAKE RIVER
41 15 COPPERFIELD
T/OX BOW RESERVOIR 130892
PVD HWY BRDG .4 MI N OF BROKNLEE 0AM
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
IG/L
0,800
0.950
0.990
0.760
0.720
0.825
0.500
0.060
0.050
0.640
00625
TOT KJEL
N
MG/L
0.600
0.400
0.700
0.600
0.400
1.100
1.850
1.630
0*550
1.000
00610
NH3-N
TOTAL
MG/L
0.065
0.075
0.060
0.056
0.056
0.044
0.055
0.045
0.040
0.045
00671
PHOS-DIS
ORTHO
MG/L P
0.060
0.045
0.045
0.016
0.016
0.024
0.020
0.015
0.010
0.060
00665
PHOS-TOT
MG/L P
0.070
0.045
0.050
0.050
0.040
0.070
0.080
0.080
0.050
0.090
-------
STORET RETRIEVAL DATE 76/08/12
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/19
74/11/23
74/12/14
75/01/04
75/01/25
75/02/09
75/02/22
75/03/09
75/04/13
75/05/17
75/06/07
75/09/28
14 15
11 45
13 06
11 00
10 55
11 00
12 05
12 04
10 45
11 30
12 20
410681
44 51 15.0 116 53 30.0 4
WlLDHORSE RIVER
41 15 COPPERFIELD
T/OX BOW RESERVOIR 130892
BRDG .4 MI N OF ADAMS/WASH CO LINE
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
IG/L
0.040
0.016
0.056
0.096
0.088
0.152
0.232
0.297
0.105
0.070
o.oao
0.045
00625
TOT KJEL
N
MG/L
0.600
0.200
0.300
0.700
0.700
0.600
0.100
0.700
1.050
0.850
1.050
0.600
00610
NH3-N
TOTAL
MG/L
0.025
0.030
0.010
0.020
0.016
0.040
0.012
0.032
0.020
0.080
0.015
0.015
00671
PHOS-DIS
ORTHO
MG/L P
0.015
0.015
0.015
0.028
0.016
0.016
0.016
0.024
0.025
0.025
0.015
0.010
00665
PHOS-TOT
MG/L P
0.020
0.020
0.020
0.040
0.020
0.030
0.020
0.070
0.080
0.050
0.050
------- |