U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
DWORSHAK RESERVOIR
CLEARWA7ER COUNTY
IDAHO
EPA REGION X
WORKING PAPER No, 779
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
•&G.P.O. 699-440
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REPORT
ON
DWQRSHAK RESERVOIR
CLEARWATER COUNTY
IDAHO
EPA REGION X
WORKING PAPER No, 779
WITH THE COOPERATION OF THE
IDAHO DEPARTMENT OF HEALTH AND WELFARE
AND THE
IDAHO NATIONAL GUARD
JULY, 1977
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REPORT ON DWORSHAK RESERVOIR
CLEARWATER COUNTY, IDAHO
EPA REGION X
by
National Eutrophication Survey
Water and Land Quality Branch
Monitoring Operations Division
Environmental Monitoring & Support Laboratory
Las Vegas, Nevada
and
Special Studies Branch
Corvallis Environmental Research Laboratory
Corvallis, Oregon
Working Paper No. 779
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
July 1977
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CONTENTS
Page
Foreword i i
List of Idaho Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 4
III. Lake Water Quality Summary 6
IV. Nutrient Loadings 12
V. Literature Reviewed 18
VI. Appendices 19
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11
FOREWORD
The National Eutrophicatlon Survey was Initiated 1n 1972 1n
response to an Administration commitment to Investigate the nation-
wide threat of accelerated eutrophlcatlon to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concen-
trations, 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 nonpoint source pollution abatement in lake water-
sheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophlcatlon 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
watershed 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)], water quality criteria/standards review
[§303(c)L clean lakes [§314(a,bj], and water quality monitoring
[§106 and §305(b)] activities mandated by the Federal Water
Pollution Control Act Amendments of 1972.
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111
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condition
are being made to advance the rationale and data base for refine-
ment of nutrient water quality criteria for the Nation's freshwater
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 the U.S. Environmental Protection
Agency and to augment plans implementation by the states.
ACKNOWLEDGMENTS
The staff of the National Eutrophication Survey (Office of
Research and Development, U.S. Environmental Protection Agency)
expresses sincere appreciation to the Idaho Department of Health
and Welfare for professional involvement, to the Idaho National
Guard for conducting the tributary sampling phase of the Survey,
and to those Idaho wastewater treatment plant operators who pro-
vided effluent samples and flow data.
The staff of the State of Idaho Department of Health and
Welfare, Division of Environment, provided invaluable lake docu-
mentation and counsel during the Survey, reviewed the preliminary
reports and provided critiques most useful in the preparation of
this Working Paper Series.
Major General James S. Brooks, Adjutant General of Idaho, and
Project Officer Major Vestal L. Baker, who directed the volunteer
efforts of the Idaho National Guardsmen, are also gratefully
acknowledged for their assistance to the Survey.
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IV
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF IDAHO
LAKE NAME
American Falls Reservoir
Cascade Reservoir
Coeur d'Alene Lake
Dworshak Reservoir
Hauser Lake
Hayden Lake
Island Park Reservoir
Lake Lowell (Deer Flat Reservoir)
Magic Reservoir
Palisades Reservoir
Payette Lake
Lower Twin Lake
Upper Twin Lake
COUNTY
Bannock, Bingham, Power
Valley
Benewah, Kootenai
Clearwater
Kootenai
Kootenai
Fremont
Canyon
Blaine, Camas
Bonneville (Lincoln in WY)
Valley
Kootenai
Kootenai
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DWORSHAK RESERVOIR
<8> Tributary Sampling Site
X Lake Sampling Site:
Sewage Treatment Facility
^Drainage Area Boundary
Map Location
CWORSHAK
RESERVOIR
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REPORT ON DWORSHAK RESERVOIR, IDAHO
STORE! NO. 1604
I. CONCLUSIONS
A. Trophic Condition:*
Based upon Survey data and field observations Dworshak
Reservoir is considered oligotrophic. Chlorophyll a_ values
ranged from 0.5 yg/1 to 6.7 yg/1 in the lake with a mean of
2.4 yg/1. Potential for primary production as measured by
algal assay control yields was low. Of the 13 Idaho lakes
sampled in 1975, 11 had higher median total phosphorus, 1
had higher median inorganic nitrogen and 5 had higher median
orthophosphorus levels than Dworshak Reservoir.
Field limnologists reported Dworshak Reservoir was a
clean and beautiful lake. The Idaho Department of Water
Resources et al. (1975) has noted that the lake is of high
water quality and low productivity, but that it will be a
future site for heavy subdivision and recreational develop-
ment, and should be watched closely for any deleterious
changes.
*See Appendix E.
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B. Rate-Limiting Nutrient:
The algal assay results indicate Dworshak Reservoir was limited
by available phosphorus at the times the samples were collected
(04/07/75, 09/11/75). The reservoir data suggest primary limitation
by nitrogen on all three sampling occasions.
C. Nutrient Controllability:
1. Point Sources -
During the sampling year point sources were estimated to
contribute only 0.4% of the total phosphorus loading to Dworshak
Reservoir. The towns of Headquarters and Elk River each con-
tributed 0.2% of the total phosphorus load.
The annual phosphorus loading to Dworshak Reservoir of
o
1.50 g P/m /yr is less than Vollenweider's (1975) proposed
loading for "eutrophic" lakes but greater than his proposed
"oligotrophic" level on the basis of lake mean depth and
hydraulic retention time. Any future nutrient inputs to the
lake should be carefully evaluated as to their effect on the
high water quality of the reservoir.
2. Nonpoint Sources -
Nonpoint sources, including precipitation, were found to
contribute 99.6% of the total phosphorus loading to Dworshak
Reservoir during the sampling year. The North Fork Clearwater
River contributed 53.4% of the total phosphorus load, the Little
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North Fork Clearwater River contributed 10.4%, and ungaged drainage
areas were estimated to have contributed 19.3%. The Idaho Depart-
ment of Health and Welfare has also indicated that nutrient con-
tributions to the lake can be expected from bank instability and
associated slumping resulting from fluctuations of the reservoir
surface elevation (A.E. Murrey, personal communication).
The Elks Creek and Reeds Creek had slightly higher annual
phosphorus nutrient exports than would be expected from strictly
nonpoint contributions (Section IV-D). The Idaho Department of
Water Resources, et al. (1975) report that both of these creeks
are effected by upstream sewage and mining contributions, and the
U.S. Army District Engineer (1974) states that man-related non-
point contributions, such as agricultural runoff, are insig-
nificant in terms of their effect on water quality in the reservoir.
Additional investigation is needed to determine the extent of
these upstream mining and sewage sources before any recommen-
dations on their controllability can be made.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake surface area, mean and maximum depth were provided by Herman
Ray (personal communication). Tributary flow data were provided
by the Idaho District Office of the U.S. Geological Survey (USGS).
Outlet drainage area includes the lake surface area. Mean hydraulic
retention time was obtained by dividing the lake volume by mean
flow of the outlet. Precipitation values are estimated by methods
as outlined in National Eutrophication Survey (NES) Working Paper
No. 175. A table of metric/English conversions is included as
Appendix A.
A. Lake Morphometry:
2
1. Surface area: 76.89 km.
2. Mean depth: 55.5 meters.
3. Maximum depth: ? meters.
4. Volume: 4,267.875 x 10& m3.
5. Mean hydraulic retention time: 305 days.
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B. Tributary and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage,, Mean flow
Name area (km ) (m
A-2 North Fork Clearwater River 3,522.4 106.92
B-l Elk Creek 240.4 7.30
F-l Reeds Creek 161.6 4.90
G-l Breakfast Creek 334.1 11.00
H-l Little North Fork 678.6 23.00
Clearwater River
Minor tributaries and
immediate drainage - 1 ,306.2 43.66
Totals 6,243.3 196.78
2. Outlet - A-l Clearwater River 6,319.6 161.71
C. Precipitation:
1. Year of sampling: 64.9 cm.
2. Mean annual : 66.2 cm.
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III. LAKE WATER QUALITY SUMMARY
Dworshak 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
five stations on the lake and from a number of depths at each station
(see map, page v). During each visit, depth-integrated samples were
collected from each station for chlorophyll a_ analysis and phyto-
plankton identification and enumeration. During the first and last
visits, 18.9-liter depth-integrated samples were composited for algal
assays. The maximum depth sampled at all lake stations was 64.0
meters (the maximum line depth on the helicopter sampling probe).
For a more detailed explanation of NES methods, see NES Working Paper
No. 175.
The results obtained are presented in full in Appendix C and are
summarized in III-A for waters at the surface and at the maximum
depth for each site. Results of the phytoplankton counts and
chlorophyll ^determinations are included in III-B. Results of the
limiting nutrient study are presented in III-C.
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DWORSHAK
STOPET CODE 1604
PHYSICAL AND CHEMICAL CHARACTERISTICS
( 4/ 7/75 ) ( 7/23/75 )
*AX MAX
S*«» = s DEPTH S»*» = 5 DEPTH
"iMGF RANGE
E MEDIAN (METEP-S) N» HANGE MEDIAN (METERS)
N*
( 9/11/75 )
MAX
5»«« = 5 DEPTH
RANGE
RANGE MEDIAN (METERS)
TEMPERATURE (OEG CF>;T)
O.-l.c M DEPTH s 2.7- 4.5
MAX DEPTH** 4 ?.5- 4.2
4.0 0.0- 1.5
3.6 33.5- 64.0
21.4- 24.2
0.0- 1.5 10 15.4- 16.6 16.0 0.0- 1.5
DISSOLVED OXYGEN (^G/D
O.-l.S M DEPTH 9
WAX DEPTH** 5
CONDUCTIVITY (IIMHOS)
O.-l.S M DEPTH 10
MAX DEPTH** 5
PH (STANDARD UNITS)
O.-l.c. M DEPTH 10
MAX DEPTH** S
TOTAL ALKALINITY (*-G/L)
O.-l.S M DEPTH 10
MAX DEPTH** 5
10.6- ll.y 11. if
3.P- 11.4 11.0
!"<.- 25.
0.0- 1.5 10
i3.5- 64.0 5
0.0- 1.5 10
33.5- 64.0 5
•i.O- 5.2 5.1 53.3- 53.3
7.8- 8.8 8.4 0.0- 1.5 10
9.4- 10.8 10.4 53.3- 53.3 5
6.7- 7.1
6.7- 7.0
12.- 22.
17.- 23.
7.0 0.0- 1.5 10
6.8 '33.5- 64.0 S
19. 0.0- 1.5 10
17. 33.5- 6a.O 5
30.- 34.
15.- 20.
7.3- 8.6
6.9- 8.4
10.- 28.
12.- 29.
30. 0.0- 1.5 10
16. 53.3- 53.3 5
8.0 0.0- 1.5 10
7.1 53.3- 53.3 5
16. 0.0- 1.5 10
17. 53.3- 53.3 5
1.9- ?.?
8.2- 9.4
9.0- 10.2
16.- 27.
1.- 9.
6.6- 7.2
6.4- 6.6
10.- 30.
14.- 27.
2.1 64.0- 64.0
A.9 0.0- 1.5
9.6 64.0- 64.0
21. 0.0- 1.5
6. 64.0- 64.0
6.7 0.0- 1.5
6.6 64.0- 64.0
15. 0.0- 1.5
21. 64.0- 64.0
TOTAL P (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
10 0.013-0.028 0.016 0.0- 1.5 10 0.00^-0.014 0.010 0.0- 1.5 10 0.009-0.016 0.010 0.0- 1.5
5 0.015-0.034 O.Oie J3.b- 64.0 5 0.007-0.010 0.008 53.3- 53.3 5 0.010-0.014 0.011 64.0- 64.0
DISSOLVED ORTHO P (MG/D
O.-l.S M DEPTH
MAX DEPTH**
N02»N03 (MG/L)
O.-l.S M PEPTH
DEPTH**
AMMONIA (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
KJELD«HL N (MG/LI
0.-1.5 M DEPTH
MAX DEPTH**
SECCHI DISC
10 0.004-0.013 0.009 0.0- 1.5 10 0.004-0.017 0.011 0.0- 1.5 10 0.002-0.004 0.003 0.0- 1.5
5 0.006-0.012 0.007 33.5- 64.0 5 0.013-0.014 0.013 53.3- 53.3 5 0.005-0.008 0.006 64.0- 64.0
10 O.OSO-0.080 0.070 0.0- 1.5 10 0.020-0.030 0.020 0.0- 1.5 10 0.020-0.020 0.020 0.0- 1.5
S 0.060-0.110 0.070 33.5- 64.0 5 0.060-0.090 0.070 53.3- 53.3 5 0.040-0.080 0.060 64.0- 64.0
10 0.020-0.030 0.0?0 0.0- 1.5 10 0.020-0.030 0.020 0.0- 1.5 10 0.020-0.020 0.020 0.0- 1.5
5 0.080-0.030 O.n?0 33.5- 64.0 5 0.020-0.020 0.020 53.3- 53.3 5 0.020-0.030 0.020 64.0- 64.0
10 0.200-0.400 O.?00 0.0- 1.5 10 0.200-0.200 0.200 0.0- 1.5 10 0.200-0.300 0.200 0.0- 1.5
5 0.200-0.200 O.?oo 33.5- 64.0 5 0.200-0.200 0.200 53.3- 53.3 5 0.200-0.200 0.200 64.0- 64.0
1.7- 2.3
l.B
2.1- 3.9
3.0
1.8- 3.0
2.4
" N = NO. OF SAMPLES
«* MAXIMUM DEPTH SAMPLED AT EACH SITE
*»« s = MO. OF SITES SAMPLED ON THI^ DATE
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8
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
04/07/75
07/23/75
09/11/75
Dominant
Genera
1. Melosira
2. Chroomonas
3. Cryptomonas
Other genera
Total ,
1. Mallomonas
2. Oocystis
3. Ankistrodesmus
4. Melosira
Other genera
Total
1. Coelosphaerium
2. Melosira
3. Aphanizomenon
4. Ankistrodesmus
5. Asterionella
Other genera
Total
Algal
Unit
per ml
1,036
192
154
1,382
286
239
95
48
668
579
241
96
48
48
97.
1,109
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2. Chlorophyll
Sampling Station Chlorophyll a_
Date Number (yq/1)
04/07/75 01 2.2
02 0.9
03 1.7
04 0.6
05 0.5
07/23/75 01 6.7
02 4.4
03 3.0
04 1.3
05 3.0
09/11/75 01 2.8
02 2.8
03 . 3.5
04 1.0
05 1.9
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10
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
a. 04/07/75 Stations 01-03
Ortho P
Inorganic N
Spike (mg/1) Cone, (mg/1) Cone, (mg/1)
Control 0.008
0.05 P 0.058
0.05 P + 1.0 N 0.058
1.00 N 0.008
0.104
0.104
1.104
1.104
Stations 04 and 05
Ortho P
Inorganic N
Spike (mg/1) Cone, (mg/1) Cone, (mg/1)
Control 0.008
0.05 P 0.058
0.05 P + 1.0 N 0.058
1.00 N 0.008
b. 09/11/75 Stations 01-03
Ortho P
0.072
0.072
1.072
1.072
Inorganic N
Spike (mg/1) Cone, (mg/1) Cone, (mg/1)
Control
0.05 P
0.05 P + 1.0
1.00 N
0.005
0.05-5
0.055
0.005
0.050
0.050
1.050
1.050
Spike (mg/1)
Control 0.005
0.05 P 0.055
0.05 P + 1.0 N 0.055
1.00 N 0.005
Stations 04 and 05
Ortho P Inorganic N
Cone, (mg/1) Cone, (mg/1)
0.055
0.055
1.055
1.055
Maximum Yield
(mg/1-dry wt.)
0.9
3.9
18.9
0.6
Maximum Yield
(mg/1-dry wt.)
0.2
2.4
18.9
0.2
Maximum Yield
(mg/1-dry wt.)
0.3
4.4
18.9
0.3
Maximum Yield
(mg/1-dry wt.)
0.4
4.0
18.6
0.4
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11
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum, indicate that the potential primary productivity in
Dworshak Reservoir was low to moderate at the times assay samples
were collected (04/07/75, 09/11/75). In all assays, a signifi-
cant increase in yield occurred when phosphorus was added alone
and in combination with nitrogen indicating phosphorus limitation.
The addition of only nitrogen resulted in a yield which was not
significantly greater than that of the control.
The mean inorganic nitrogen to orthophosphorus ratios (N/P)
in the lake data were less than 12/1 on all sampling occasions,
suggesting nitrogen limitation (a mean N/P ratio of 14/1 or greater
generally reflects phosphorus limitation).
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12
IV. NUTRIENT LOADINGS
(See Appendix D for data)
For the determination of nutrient loadings, the Idaho 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 June 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 Idaho District Office of the U.S. Geological Survey for the
tributary sites nearest the lake.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of the U.S. Geological Survey
computer program for calculating stream loadings. Nutrient loads
indicated for tributaries are those measured minus known point
source loads, if any.
Nutrient loadings for unsampled "minor tributaries and immediate
drainage" ("ZZ" of USGS) were estimated by using the mean annual
2
nutrient loads, in kg/km /yr, in North Fork Clearwater River,
Breakfast Creek and Little North Fork Clearwater River at Stations
2
A-2, G-l and H-l and multiplying the means by the ZZ area in km .
Nutrient loads for the Headquarters and Elk River wastewater
treatment plants were estimated at 1.134 kg P and 3.401 kg N/capita/year.
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13
A. Waste Sources:
1. Known municipal
Name
Headquarters
Elk River
Pop.*
Served
250
250
Treatment*
Stabilization
Pond
Stabilization
Pond
Mean Flow
(m3/d x 1Q3)
0.095**
0.095**
Receiving
Water
Reeds Creek
Elk Creek
2. Known industrial - None
*U.S. EPA, 1971. .
**Estimated at 0.3785 m /capita/day.
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14
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
% of
Source kg P/yr total
a. Tributaries (nonpoint load) -
A-2 North Fork Clearwater 61,540 53.4
River
B-l Elk Creek 6,505 5.6
F-l Reeds Creek 5,405 4.7
6-1 Breakfast Creek 5,735 5.0
H-l Little North Fork 12,010 10.4
Clearwater River
b. Minor tributaries and immediate
drainage (nonpoint load) - 22,205 19.3
c. Known municipal STP's -
Headquarters 285 0.2
Elk River 285 0.2
d. Septic tanks - None known
e. Known industrial - None
f. Direct precipitation* - 1,345 1.2
Totals 115,315 100.0%
2. Output - A-l Clearwater River 84,025
3. Net annual P accumulation - 31,290
*Estimated (See NES Working Paper No. 175).
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15
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kg N/yr total
a. Tributaries (nonpoint load) -
A-2 North Fork Clearwater 1,880,085 57.9
River
B-l Elk Creek 55,420 1.7
F-l Reeds Creek 42,320 1.3
G-l Breakfast Creek 190,205 5.9
H-l Little North Fork 313,375 9.6
Clearwater Creek
b. Minor tributaries and immediate
drainage (nonpoint load) - 681,835 21.0
c. Known municipal STP's -
Headquarters 850 <0.1
Elk River 850 <0.1
d. Septic tanks - None known
e. Known industrial - None
f. Direct precipitation* - 83,010 2.6
Totals 3,247,950 100.0%
2. Outputs - A-l Clearwater River 1,892,860
3. Net annual N accumulation - 1,355,090
*Estimated (See NES Working Paper No. 175).
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16
D. Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
2 2
Tributary kg P/km /yr kg N/km /yr
North Fork Clearwater River 17 534
Elk Creek 27 230
Reeds Creek 33 262
Breakfast Creek 17 569
Little North Fork Clearwater River 18 462
E. Mean Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total r
Tributary (mg/1) (mg/1)
C-l Cranberry Creek 0.031 0.643
D-l Swamp Creek 0.029 0.532
E-l Weitas Creek 0.033 0.393
J-l Isabella Creek 0.013 0.516
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17
F. Yearly Loadings:
In the following table, the existing phosphorus loading is
compared to the relationship proposed by Vollenweider (1975).
Essentially, his "eutrophic" loading is that at which the receiving
waters would become eutrophic or remain eutrophic; his "oligotrophic"
loading is that which would result in the receiving water remaining
oligotrophic or becoming oligotrophic if morphometry permitted. A
"mesotrophic" loading would be considered one between "eutrophic" and
"oligotrophic."
Note that Vollenweider's model may not be applicable to water
bodies with very short retention times or in which light penetration
is severely restricted from high concentrations of suspended solids
in the surface waters.
Total Yearly
Phosphorus Loading
(g/m2/yr)
Estimated loading for Dworshak Reservoir 1.50
.Vollenweider's "eutrophic" loading 1.56
Vollenweider's "oligotrophic" loading 0.78
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18
V. LITERATURE REVIEWED
Falter, C. Michael, Rudy R. Ringe, Jack Skille, and Rick Stowell.
1974. Limnology in Dworshak Reservoir in the Second Year after
Dam Closure. Interim report submitted to U.S. Army Corps of
Engineers, Walla Walla District.
Idaho Department of Water Resources, Department of Health and
Welfare, Department of Fish and Game, and Department of Budget,
Policy Planning and Coordination. 1975. Idaho Environmental
Overview. Boise, Idaho.
Murrey, A.E. 1977. Personal communication (nutrient contri-
butions to Dworshak Reservoir). Idaho Department of Health and
Welfare. Boise, Idaho.
Ray, Herman. 1976. Personal communication (morphometric data of
selected Idaho water bodies). Boise, Idaho.
U.S. Army Corps of Engineers. 1974. Draft Environmental Impact
Statement on Dworshak Dam and Reservoir. Walla Walla, Washington,
U.S. Environmental Protection Agency. 1971. Inventory of Waste-
water Treatment Facilities. EPA Publication No. OWP-1. Office
of Media Programs, Office of Water Programs, Washington, D.C.
U.S. Environmental Protection Agency. 1975. National Eutrophi-
cation Survey Methods 1973-1976. Working Paper No. 175.
National Environmental Research Center, Las Vegas, Nevada, and
Pacific Northwest Environmental Research Laboratory, Corvallis,
Oregon.
Vollenweider, R. A. 1975. Input-Output Models With Special
Reference to the Phosphorus Loading Concept in Limnology.
Schweiz. Z. Hydrol. 37:53-84.
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19
VI. APPENDICES
APPENDIX A
CONVERSION FACTORS
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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
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APPENDIX B
TRIBUTARY FLOW DATA
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TRIBUTARY FLOW INFORMATION FOR IDAHO
L»KE CODE 160* DWORSHAK RESERVOIR
TOTAL DRAINAGE AREA OF LAKF(SO KM) 6319.6
OR/23/76
NORMALIZED FLOWS(CMS)
TRIBUTARY ARF.AISQ KM)
1604A1
1604A?
1604B1
1604F1
1604G1
1604H1
1604Z7
6319.6
35??.4
?40.4
161.6
334.1
678.6
1383.1
JAN
85.80
62.58
4.28
2.86
6.09
10.02
23.56
FE8
96,26
79.00
5.38
3.62
7.08
13.22
29.73
MAP
14?.00
96.56
*.60
4.42
12.49
?n.33
41.34
APR
353.39
150.93
10.31
6.91
17.47
29.17
62.30
MAY
516.22
362.46
24.7?
16.62
39.64
64.95
152.91
JLIN
324.79
270.43
18.46
12.40
24.04
65.70
110.44
JUL AUG SF.P
100.24 44.17 38.51
76.74 30.58 30.30
5.24 2.10 2.07
3.51 1.39 1.39
7.B7 3.06 2.69
19.03 6.63 5.41
32.28 12.40 11.58
OCT
52.67
36.25
2.46
1.67
3.00
5.83
13.42
fn
*3
.7
7.
3
7
1*.
NOV
.25
.89
.00
.01
.85
.42
.54
DEC
100.81
42.7*
2.92
1.95
4.45
7.82
16.93
MEAN
161.71
106.92
7.30
4.90
11.00
23.00
43.66
SUMMARY
TOTAL
SUM OF
DRAINAGE
AREA OF
LAKF. =
SUB-DRAINAGE AREAS =
6319
6320
.6
.1
TOTAL FLOW IN =
TOTAL FLOW OUT =
2359
1939
.44
.14
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR
1604A1
MEAN FLOW
FLOW DAY
FLOW DAY
FLOW
1604A2
10
11
1?
1
•?_
3
4
5
6
7
8
9
10
11
12
1
2
•\
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
74.190
155.743
100.242
140.735
367.836
312.618
108.170
156.875
230.499
137.054
96.730
211.810
?2.172
25.882
22.370
36.161
26.929
45.024
76.739
?99.875
406.063
139.715
48.507
31.885
19
17
26
27
19
?1
15
15
14
17
1"
2n
17
23
?7
19
12
24
19
17
13
63.430
207.279
60.032
239.277
431.265
287.133
155.743
76.455
107.604
146.681
252.020
21.294
22.653
24.013
34.263
27.184
60.881
334.139
90.331
37.945
30.582
?9
586.159
-------
LAKE CODE 1604
TRIBUTARY FLOW INFORMATION FOR IDAHO
DWORSHAK RESERVOIR
08/23/76
MEAN MONTHLY FLO*S AND DAILV FLO»-S(CMSI
TRIBUTARY MONTH YEAR MEftN FLOW DAY
160491
1604F1
1604G1
1604H1
FLOW DAY
FLOW DAY
FLOW
10
11
12
1
?
3
4
5
f
7
8
9
in
11
12
1
2
3
4
5
6
7
8
9
in
11
12
1
2
3
4
5
6
7
8
9
10
1 1
12
1
?
3
4
5
6
7
a
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
74
74
74
75
75
75
75
75
75
75
75
75
74
74
74
75
75
75
75
75
75
75
75
75
1.501
1.756
1.529
2.464
1.841
3.058
5.?39
20.445
27.694
9.543
3.313
2.180
6.4?8
7.504
6.485
10.477
7.815
13.026
2?. 229
86.933
117.515
40.493
14.045
9.231
2.322
2.690
2.322
3.794
2.803
4.729
8.099
31.998
43.608
14.810
5.097
3.341
5.040
5.918
5.069
8.353
6.145
10.506'
18.293
75.606
103.640
34.263
11.327
7.334
19
17
26
27
19
2n
1?
16
19
If.
13
19
16
2*
27
19
20
1?
15
19
16
13
19
16
26
?7
19
2n
12
15
19
16
1?
19
16
26
27
19
2n
12
15
19
16
13
1.444
1.557
1.501
2.350
1.869
3.228
4.163
28.883
6.173
2.520
2.095
6.145
7.164
6.371
9.939
7.872
13.705
17.641
127.992
26.165
10.760
8.863
2.209
2.577
2.294
3.596
3. 832
4.955
6.400
47.289
9.543
3.879
3.200
4.814
S.635
4.984
7.900
6.230
11.044
14.385
112.984
21 .691
H. 580
7.023
17.811
28
75.606
28
27.835
28
65.412
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STORET RETRIEVAL DATE 76/08/25
MATL EUTRPPHICATION SURVEY
EPA-LAS VEGAS
DATE
FROM
TO
75/04/07
75/07/23
75/09/11
TIME DEPTw
OF
DAY
12
12
12
12
12
12
12
12
16
16
16
16
16
16
16
16
14
14
14
14
14
14
14
14
FEF.T
00
00
00
00
00
00
00
00
40
40
40
40
40
40
40
40
10
10
10
10
10
10
10
10
0000
0005
0015
0025
0050
0100
0150
0210
0000
0005
0020
0030
0060
0100
0140
0175
0000
0005
0025
0034
0060
0110
0160
0210
00010
WATER
TEMP
CENT
24.
22,
13.
11.
7.
6.
5.
5.
16.
16.
16.
10.
5.
4.
3.
2.
160401
46 31 06.0 116 17 25.0 3
OfcORSHAK RESERVOIR
16035 IDAHO
11EPALES
2111202
0999 FEET DEPTH CLASS
00300
DO
MS/L
11.2
11.2
11 .0
10.6
10.2
8.6
7.6
8.8
8.0
8.4
9.8
9.6
10.4
10.6
10.8
9.4
9.0
8.8
9.0
8.8
10. 0
10.4
10.8
9.8
00077 00094
TKANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
90 22
23
24
23
23
24
25
25
84 30
32
23
20
18
17
20
18
72 23
16
12
6
1
3
5
9
00400
PH
SU
7.10
7.00
7.00
7.10
6.80
7.00
6.90
7.00
8.65
8.40
7.70
7.50
7.30
7.20
7.30
8.45
7.00
6.95
7.00
6.65
6.55
6.40
6.50
6.60
00410
T ALK
CAC03
MG/L
22
21
22
22
22
18
18
17
16
15
14
16
15
15
17
17
24
20
23
17
22
17
22
27
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.020K
0.020
0.020
0.020K
0.020
0.020
6.020
0.020
0.020K
0.040
0.020
0.020
0.0?OK
0.020K
0.020K
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
00
00625
TOT KJEL
N
MG/L
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200
0.300
0.300
0.200
0.200
0.200
0.200
0.200K
00630
N02*^03
N-TOTAL
MG/L
0.050
0.050
0.060
0.060
0.070
0.090
0.110
0.110
0.020
0.020K
0.020K
0.020K
0.030
0.070
0.070
0.060
0.020K
0.020K
0.020K
0.020K
0.060
0.060
0.060
0.060
00671
PHOS-DIS
ORTHO
MG/L P
0.006
0.011
0.015
0.011
0.013
0.009
0.017
0.01?
0.012K
0.013K
0.012K
0.010K
0.012K
0.012K
0.013K
0.014K
0.004
0.003
0.005
0.002
0.005
0.005
0.005
0.007
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
5TORET RETRIEVAL D«TE 76/08/25
MAIL EUTROPHICATION SURVEY
EPA-LAS VEGAS
160401
46 31 06.0 116 17 25.0
OWOPSHAK RESERVOIR
16035 IDAHO
130891
11EPALES
0999 FEET DEPTH
2111202
CLASS 00
DATE
FROM
TO
75/04/07
75/07/23
75/09/11
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF A OEMNING
DAY FEET
12
12
12
12
12
12
12
12
16
16
16
16
16
16
16
16
14
14
14
14
14
14
14
14
00
00
00
00
00
00
00
00
40
40
40
40
40
40
40
40
10
10
10
10
10
10
10
10
0000
0005
0015
0025
0050
0100
0150
0210
0000
0005
0020
0030
0060
0100
0140
0175
0000
0005
0025
0034
0060
0110
0160
0210
MG/L P
0,
0.
0,
0,
0,
0,
0,
0,
0.
0,
0,
0,
. 0,
0.
0,
0.
0.
0.
0.
0.
0.
0.
0.
0.
,028
,018
.017
,017
.016
,018
.018
.01*
.011
.013
,009
.007
,007
,007
,007
,010
,016
,011
,010
,007
,007
,008
,010
,010
UG/L PERCENT
2.2
6.7
2.8
-------
STORE! RETRIEVAL DATE 76/08/35
NATL FUTROPHICATION SURVEY
EPA-LAS VEGAS
00010
DATE
FROM
TO
75/04/07
75/07/23
75/09/11
TIME
OF
DAY
12
12
12
12
12
12
12
12
14
14
14
14
14
14
14
14
11
11
11
11
11
11
11
11
45
45
45
45
45
45
45
45
15
15
15
15
15
15
15
15
45
45
45
45
45
45
45
45
DEPTH
FEET
0000
0005
0015
0025
0050
0100
0150
0210
0000
0005
0025
0030
0060
0100
0140
0175
0000
0005
0020
0030
0060
0110
0160
0210
*ATER
TEMP
CENT
2.7
3.2
3.2
3.0
2.9
2.8
2.5
2.5
24.0
21.6
17.8
11.6
7.2
6.4
5.7
5.0
16.1
16.1
15.6
11.6
5.7
4.0
3.1
1.9
160403
46 35 50.0 116 17 18.0 3
DWORSHAK RESERVOIR
16035 IDAHO
130891
11EPALES
2111202
0999 FEET DEPTH CLASS
00300
DO
MG/L
11. a
11.4
11.6
11.4
11.2
11.0
11.2
11.2
8.2
8.8
10.0
9.6
11,4
11.0
11.0
10.0
9.4
8.6
8.6
9.0
10.2
10.2
10.4
9.4
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
78 24
24
24
24
24
23
24
25
114 32
30
29
21
19
19
15
16
120 19
17
10
5
1
1
2
7
00400
PH
su
7.10
7.00
7.10
7.10
6.80
7.10
7.00
7.00
7.95
8.00
7.95
7.55
7.50
7.40
7.40
7.15
6.60
6.60
6.60
6.50
6.50
6.50
6.50
6.60
00410
T ALK
CAC03
. MG/L
19
18
18
18
18
19
20
21
15
15
16
15
15
15
14
15
10K
10K
10K
10K
10K
10K
19
19
00610
NH3-N
TOTAL
MG/L
0.030
0.020K
0.020K
0.020
0.020
0.0?OK
0.0?0
0.020K
0.030
Q.030
0.020
0.020
0.0?0
0.020
0.020K
0.0?OK
0.020K
0.0?OK
0.020K
0.020K
0.020K
0.020K
0.0?OK
0.0?OK
00
00625
TOT KJEL
N
MG/L
0.400
0.200K
0.200K
0.100
0.200K
0.200K
0.200K
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200
0.200
00630
N02&.N03
N-TOTAL
MG/L
0.080
0.070
0.070
0.070
0.070
0.070
0.070
0.070
0.020
0.020K
0.020K
0.020K
0.040
0.070
o.oao
0.070
0.020K
0.020K
0.020K
0.020K
0.020K
0.070
0.080
0.040
00671
PHOS-OIS
ORTHO
MG/L P
0.013
0.013
o.ooe
0.011
0.015K
0.012
0.015
0.006
0.017K
0.013K
0.012K
0.011K
0.015K
0.013K
0.013K
0.013K
0.004
0.003
0.003
0.002
0.004
0.005
0.011
0.006
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTHOPHICATION SURVEY
EPA-LAS VF6AS
160402
46 35 50.0 116 17 18.0
DWORSHAK RESERVOIR
16035 IDAHO
130891
11EPALES
0999 FEET
2111202
DEPTH CLASS 00
DATE
FROM
TO
75/04/07
75/07/23
75/09/11
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
. OF A RF.MNING
DAY FEET
12
12
12
12
12
12
12
12
14
14
14
14
14
14
14
14
11
11
11
11
11
11
11
11
45
45
45
45
45
45
45
45
15
15
15
15
15
15
15
15
45
45
45
45
45
45
45
45
0000
0005
0015
0025
0050
0100
0150
0210
0000
0005
0025
0030
0060
0100
0140
0175
0000
0005
0020
0030
0060
0110
0160
0210
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
p
017
013
016
013
012
013
015
015
012
010
014
007
006
006
007
010
014
010
012
008
007
009
013
010
UG/L PERCENT
0.9
4.4
2.8
-------
STO&ET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
DATE
FRO"
TO
75/04/07
75/07/23
75/09/11
0001
TIME DEPTH WATER
OF TEMP
DAY FEET
13
13
13
13
13
13
15
15
15
15
15
15
15
11
11
11
11
11
11
11
11
25
25
25
25
25
25
40
40
40
40
40
40
40
15
15
15
15
15
15
15
15
0000
0005
0015
0025
0050
oiin
0000
0005
0015
0030
0070
0120
0175
0000
0005
0020
0030
0060
0110
0160
0210
CENT
3
3
3
3
3
3
22
21
16
11
7
6
5
15
15
15
11
5
4
3
2
0
.8
.7
.7
.7
.4
.1
.4
.4
.5
.6
.1
.1
.1
.9
.6
.3
.5
.2
.1
.2
.1
160403
46 38 10.0 116 14 03.0
DWORSHAK RESERVOIR
16035 IDAHO
1308
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
160403
46 38 10.0 116 14 03.0 3
DrfORSHAK RESERVOIR
16035 IDAHO
130991
11EPALES
0125 FEET
DEPTH
2111202
CLASS 00
DATE
FROM
TO
75/04/07
75/07/23
75/09/11
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF A RFMNING
PAY FEET
13
13
13
13
13
13
15
15
15
15
15
15
15
11
11
11
11
11
11
11
11
25
25
25
25
25
25
40
40
40
40
40
40
40
15
15
15
15
15
15
15
15
0000
0005
0015
0025
0050
0110
0000
0005
0015
0030
0070
0120
0175
0000
0005
0020
0030
0060
0110
0160
0210
MG/L P
0.
0.
0,
0,
0,
0,
0.
0,
0
0,
0,
0,
0,
0.
0,
0,
0.
0,
0.
0,
0,
,023
.014
,014
,013
,015
.034
,009
,010
.009
,005
,006
.006
.008
.011
.010
.012
.007
,009
,009
.013
,014
UG/L PERCENT
1.7
3.0
3.5
-------
STOftET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATIOM SURVEY
EPA-LAS VEGAS
DATE
FRO"
TO
75/04/07
75/07/23
75/09/11
00010
TIME DEPTH WATER
OF TF.MP
DAY FEET
12
12
12
12
12
12
14
14
14
14
14
14
14
14
10
10
10
10
10
10
10
10
20
20
20
20
20
20
30
30
30
30
30
30
30
30
10
10
10
10
10
10
10
10
ooon
0005
0015
0065
oiao
0170
0000
0005
0015
0030
0060
0100
0140
0175
0000
0005
0033
0050
0090
0130
0170
0210
CENT
4
4
4
4
4
4
22
21
15
11
7
6
5
5
16
16
11
7
4
3
2
2
.3
.?.
.2
.1
.1
.1
.9
.7
.7
.6
.3
.5
.8
.2
.0
.0
.0
.7
.3
.7
.9
.1
160404
46 38 35.0 116 01 35.0 3
DtfORSHAK RESERVOIR
16035 IDAHO
130891
11EPALES
2111202
0999 FEET DEPTH CLASS
00300
DO
MG/L
11.0
10.6
11.0
11.0
10.6
11.0
8.6
8.4
8.2
9.4
10.6
8.2
10.8
10.8
8.2
8.4
8.2
9.2
10.4
10.6
10.2
9.6
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
66 15
17
17
17
17
20
154 30
30
24
19
17
16
15
16
120 27
22
13
1
IK
1
3
6
00400
PH
SIJ
6.90
6.70
6.60
6.50
6.70
6.70
7.40
7.35
7.60
7.40
7.20
7.10
7.10
7.05
6.90
6.70
6.70
6.65
6.60
6.50
6.50
6.40
00410
T ALK
CAC03
MG/L
13
12
14
13
14
17
16
17
15
25
22
23
23
25
25
30
20
22
19
25
22
23
00610
NH3-N
TOTAL
MG/L
0.020
0.030
0.0?0
0.020
0.020
0.030
0.020
0.020K
0.020K
0.030
0.020
0.030
0.020K
0.020K
0.020K
0.020K
0.0?OK
0.020K
0.020K
0.020K
0.020K
0.020K
00
00*25
TOT KJEL
N
MG/L
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.?OOK
0.200K
0.200K
0.200K
0.200K
0.200K
00630
N02R.N03
N-TOTAL
MG/L
O.OBO
0.070
0.060
0.060
0.060
0.060
0.020K
0.020K
0.020K
0.020K
0.060
0.060
0.080
0.080
0.020K
0.020K
0.020K
0.030
0.060
o.nso
0.080
0.080
00671
PHOS-DIS
ORTHO
MG/L P
0.008
0.007
0.010
0.010
0.004
0.008
0.008
0.004
0.009
0.018K
0.013K
0.014K
0.013K
0.013K
0.004
0.003
0.003
0.004
0.004
0.006
0.006
0.006
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 7^/08/25
NATL EUTPOPHICATION SURVEY
EPA-LAS VEGAS
160404
46 38 35.0 116 01 35.0
DWORSHAK RESERVOIR
16035 IDAHO
130«91
11EPALES 2111203
0999 FEET DEPTH CLASS 00
DATE
FROM
TO
75/04/07
75/07/23
75/09/11
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF A REMNING
DAY FEET
12
12
12
12
12
12
14
14
14
14
14
14
14
14
10
10
10
10
10
10
10
10
20
20
20
20
20
20
30
30
30
30
30
30
30
30
10
10
10
10
10
10
10
10
0000
0005
0015
0065
0120
0170
ooon
0005
0015
0030
0060
0100
0140
0175
0000
0005
0033
0050
0090
0130
0170
0210
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.016
.015
.014
.016
.021
.020
.014
.012
.013
.008
.007
.006
.007
.007
.009
.009
.013
.007
.008
.008
.011
.011
UG/L PERCENT
0.6
1.3
1.0
-------
STORE! RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
DATE
FRO"
TO
75/04/07
75/07/23
75/09/11
TIME
OF
DAY
13
13
13
13
13
13
15
15
15
15
15
15
15
15
10
10
10
10
10
10
10
10
00
00
00
00
00
00
00
00
00
00
00
00
00
00
40
40
40
40
40
40
40
40
DEPTH
FEET
0000
0005
0015
0065
0120
0170
0000
0005
0015
0030
0060
0100
014Q
0175
0000
0005
0025
0032
0060
0110
0160
0210
00010
WATER
TEMP
CENT
4.5
4.3
4.3
4.2
4.1
4.2
22.8
22.5
17.5
11.5
7.1
6.3
5.2
5.1
15.4
15.8
14.8
11.9
5.5
4.0
3.2
2.1
160405
46 36 42.0 116 08 30.0 3
DWORSHAK RESERVOIR
16035 IDAHO
130891
11EPALES
2111202
0999 FEET DEPTH CLASS
00300
DO
MG/L
11.0
11.8
11.2
11.2
11.0
11.0
8.2
7.8
9.0
9.6
10.8
11.0
10.8
10.6
9.0
8.3
8.6
8.0
10.0
10.4
10.2
10.2
00077 00094
TRANS" CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
66 17
16
16
16
15
13
126 34
30
25
20
18
18
18
15
96 22
21
17
8
1
1
1
IK
00400
PH
SU
6.90
6.80
6.70
6.60
6.50
6.70
8.05
R.OO
7.40
7.20
7.10
7.20
7.20
7.20
6.60
6.65
6.60
6.60
6.60
6.60
6.70
6.60
00410
T ALK
CAC03
MG/L
17
16
18
18
22
23
26
28
26
26
25
28
28
29
15
13
14
10K
15
18
18
14
00610
NH3-N
TOTAL
MG/L
0.020
0.020
0.0?0
0.030
0.030
0.030
0.020
0.020K
0.020K
0.040
0.020K
0.020K
0.020
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.020K
0.030
00
00625
TOT KJEL
N
MG/L
0.200*
0*200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200K
0.200K
0.200K
0.200K
0.200K
0.200*
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
0.200K
00630
N02J.N03
N-TOTAL
MG/L
0.070
0.070
0.070
0.080
0.070
0.070
0.030
0.020K
0.020K
0.030
0.040
0.080
0.090
0.090
0.020K
0.020K
0.020K
0.020K
0.040
0.080
0.080
0.070
00671
PHOS-DIS
OPTHO
MG/L P
0.011
0.006
0.005
0.005
0.004
0.007
o.o UK
0.010K
0.012K
0.013K
0.013K
0.012K
0.014K
0.013K
0.003
0.002
0.003
0.002
0.003
0.005
0.005
0.005
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
160405
46 36 42.0 116 OR 30.0 3
DHORSHAK RESERVOIR
16035 IDAHO
130891
11EPAUES 2111202
0999 FEET DEPTH CLASS 00
DATE
FROM
TO
75/04/07
75/07/23
75/09/11
00665
TIME DEPTH PHOS-TOT
OF
DAY FEET
13
13
13
13
13
13
15
15
15
15
15
15
15
15
10
10
10
10
10
10
10
10
00
00
00
00
00
00
00
00
00
00
00
00
00
00
40
40
40
40
40
40
40
40
0000
0005
0015
0065
0120
0170
0000
0005
0015
0030
0060
0100
0140
0175
0000
0005
0025
0032
0060
0110
0160
0210
MG/L P
0,
0,
0.
0.
0.
0.
0.
0,
0.
0,
0,
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
,017
,016
,015
,015
,017
,018
,009
,009
.011
,005
.005
,006
.006
.007
,011
,010
,010
.009
.008
.008
.009
.011
32217 00031
CHLRPHYL INCDT LT
A REMNING
UG/L PERCENT
0.5
3.0
1.9
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02S.N03
FROM OF
TO OAV FEET
74/10/19
74/11/17
74/12/36
75/01/27
75/02/19
75/04/15
75/06/15
75/06/29
75/07/14
75/08/17
75/09/15
09
17
08
10
10
11
20
10
18
13
20
no
00
00
10
00
00
00
30
30
1604A1
46 30 50.0 116 17 45.0 4
CLEARWATER RIVER
16 15 AHSAHKA
0/DWORSHAK RESERVOIR 130fl91
BELO DWORSHAK DAM 1.5 MI NE OF AHSAHKA
11EPALES 2111304
0000 FEET DEPTH CLASS 00
0630
S.N03
OTAL
G/L
0.072
0.080
0.070
0.088
0.083
0.060
0.050
0.045
0.020
0.015
0.045
00625
TOT KJEL
N
MG/L
0.100K
0.100
0.300
0.100
0.300
0.500
0.650
0.550
0.150
0.450
0.200
00610
NH3-N
TOTAL
MG/L
0.025
0.025
0.020
0.016
0.016
0.010
0.020
0.030
0.020
0.015
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.005
0.005
0.005
0.016
0.008K
0.005
0.005K
0.010
0.010
0.005K
0.005
00665
PHOS-TOT
MG/L P
0.010
0.010K
0.010K
0.016
0.010K
0.010K
0.020
0.020
0.020
0.040
0.020
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORE! RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02R.N03
FROM OF
TO DAY FEET
74/10/20 10 30
74/11/17 10 45
75/04/12 12 35
75/06/24 13 00
75/07/19 17 05
75/08/17 15 20
75/09/13 16 00
1604A2
46 50 28.0 115 37 10.0 4
N FK CLEARWATER RIVER
16 7.5 SHEEP MTN
T/DWORSHAK RESERVOIR 130891
PVO RD BROG .2 MI W OF AJQUARIUS CAMPGRND
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
R.N03
OTAL
G/L
0.016
0.016
0.015
0.020
0.005
0.005
0.003
00625
TOT KJEL
N
MG/L
0.100K
0.100K
1.600
0.800
0.150
1.100
0.200
00610
NH3-N
TOTAL
MG/L
0.010
0.020
0.025
0.015
0.015
0.010
00671
PHOS-OIS
ORTHO
MG/L P
0.005K
0.005K
0.005
0.005
0.005
0.005K
0.002
(50665
PHOS-TOT
HG/L P
0.005K
0.010K
0.020
0.010
0.020
0.030
0.040
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/19 12 15
74/11/17 15 00
75/06/16 16 35
75/06/28 15 45
75/07/19 13 00
75/08/16 10 30
75/09/13 10 30
1604B1
46 42 20.0 116 11 55.0 4
ELK CREEK
16 7.5 ELK CRK FALS
T/DWORSHAK RESERVOIR 130891
JEEP TRL 2 MI NH OF ELK CRK PICNIC AREA
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
G/L
0.018
0.008
0.005
0.005
0.010
0.005
0.010
00625
TOT KJEL
N
MG/L
0.300
0.100K
0.200
0.200
0.225
0.400
0.150
00610
NH3-N
TOTAL
MG/L
0.007
0.015
0.010
0.005
0.027
0.030
0.025
00671
PHOS-DIS
ORTHO
MG/L P
0.005
0.010
0.020
0.010
0.010
0.005K
0.020
00665
PHOS-TOT
MG/L P
0.010
0.010
0.040
0.020
0.030
0.060
0.045
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
ST09ET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/19 13 05
74/11/16 14 00
74/12/26 09 00
75/06/16 19 10
75/06/28 11 15
75/07/19 10 45
75/08/16 13 00
75/09/13 09 00
1604C1
46 39 20.0 116 07 50.0 4
CRANBERRY CREEK
16 7.5 ELK CRK FALS
T/DWORSHAK RESERVOIR 130891
UNPVD RD BROG 3 MI N OF FIVE CORNERS JCT
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
«,N03
OTAL
G/L
0.016
0.024
0.096
0.005
0.010
0.010
0.005
0.010
00625
TOT KJEL
N
MG/L
0.300
0.100K
1.400
0.500
0.900
0.250
0.800
0.200
00610
NH3-N
TOTAL
MG/L
0.010
0.015
0.165
0.020
0.020
0.030
0.010
0.020
00671
PHOS-DIS
ORTHO
MG/L P
0.020
0.025
0.020
0.015
0.015
0.010
0.005K
0.015
00665
PHOS-TOT
MG/L P
0.025
0.025
0.040
0.030
0.015
0.040
0.020
0.050
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&.N03
FROM OF
TO DAY FEET
74/10/19 14 00
74/11/16 12 00
74/12/86 11 00
75/06/16 20 30
75/06/28 11 50
75/07/19 11 15
75/08/16 13 30
75/09/13 09 35
160401
46 40 00.0 116 01 40.0 4
SWAMP CREEK
16 7.5 LITL GRN MTN
T/DWORSHAK RESERVOIR 130891
UNPVD RD BRDG 2.5 MI N OF BARTLETT POINT
11EPALES 2111304
0000 FEET DEPTH CLASS 00
0630
&.N03
OTAL
6/L
0.016
0.016
0.024
0.005
0.010
0.015
0.005
0.002
00625
TOT KJEL
N
MG/L
0.600
0.100K
0.500
0.100
1.000
0.150
1.000
0.300
00610
NH3-N
TOTAL
MG/L
0.010
0.010
0.050
0.010
0.020
0.020
0.020
0.025
00671
PHOS-DIS
ORTHO
MG/L P
0.025
0.005
0.020
0.030
0.025
0.020
0.005K
0.015
00665
PHOS-TOT
MG/L P
0.025
0.005
0.030
0.050
0.030
0.020
0.040
0.030
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORE! RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02fs,N03
FROM OF
TO DAY FEET
74/10/19 14 30
74/11/16 10 30
74/12/26 15 00
75/06/15 18 15
75/06/28 1* 30
75/07/19 12 30
75/08/16 13 00
75/09/13 10 00
1604E1
46 44 05.0 116 01 20.0 4
XEITAS CREEK
16 7.5 LITL GRN MTN
T/DWORSHAK RESERVOIR 130«91
BNK ?O.P FT, N UNPVO PD 3.4 M E LTTL GR MT
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&.N03
OTAL
G/L
0.016
0.024
0.024
0.005
0.010
0.010
0.005
0.002
00625
TOT KJEL
N
MG/L
0.400
0.200
0.500
0.200
0.750
0.100
0.700
0.200
00610
NH3-N
TOTAL
MG/L
0.005
0.015
0.030
0.010
0.020
0.015
0.015
0.025
00671
PHOS-DIS
ORTHO
MG/L P
0.010
0.010
0.005
0.010
0.005
0.005
0.005K
0.020
00665
PHOS-TOT
MG/L P
0.035
0.010
0.010K
0.020
0.010K
0.010K
0.020
0.080
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
1604F1
46 37 30.0 116 56 30.0 4
REEDS CREEK
16 15 HEADQUARTERS
T/DWORSHAK RESERVOIR 130891
UNPVD RD BRDG 3.2 MI W OF HWY 11
11EPALES 2111204
0000 FEET DEPTH CLASS 00
JCT
DATE
FROM
TO
74/10/19
74/11/16
74/12/36
75/06/15
75/06/38
75/07/19
75/08/16
75/09/13
TIME DEPTH
OF
DAY FEET
13 35
13 00
11 30
31 05
30 15
18 00
16 20
17 00
00630
N02&,N03
N-TOTAL
MG/L
0.032
0.024
0.016
0.007
0.005
0.005
0.005
0.002
00625
TOT KJEL
N
MG/L
0.400
0.100K
0.800
0.125
0.450
0.150
0.250
0.050
00610
NH3-N
TOTAL
MG/L
0.010
0.010
0.025
0.017
0.015
0.020
0.005K
0.030
00671
PHOS-DIS
ORTHO
MG/L P
0.025
0.020
0.020
0.010
0.035
0.035
0.040
0.065
00665
PHOS-TOT
MG/L P
0.025
0.025
0.030
0.015
0.035
0.050
0.060
0.065
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/2o
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02J.N03
FROM OF
TO DAY FEET
74/10/19 16 37
74/11/16 11 00
74/12/26 12 00
75/06/15 17 45
75/06/28 17 50
75/07/19 14 30
75/08/16 12 00
75/09/13 11 15
1604G1
46 53 00.0 115 56 20.0 4
BREAKFAST CREEK
16 15 80EHLS BUTTES
T/DWORSHAK RESERVOIR 130891
BNK FRM TRL .7 MI E OF FRZEOUT TRL LKOUT
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
J.N03
OTAL
G/L
0.024
0.016
0.008
0.010
0.040
0.030
0.005
0.002
00625
TOT KJEL
N
MG/L
0.200
0.100K
0.500
0.400
1.050
0.350
0.400
0.200
00610
NH3-N
TOTAL
MG/L
0.015
0.010
0.015
0.020
0.025
0.015
0.010
0.020
00671
PHOS-DIS
ORTHO
MG/L P
0.020
0.005K
0.015
0.030
0.010
0.010
0.005K
0.010
00665
PHOS-TOT
MG/L P
0.022
0.005
0.020
0.030
0.010
0.020
0.010
0.020
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/19 15 45
74/11/16 11 00
74/13/26 14 00
75/06/15 15 30
75/06/28 19 00
75/07/19 15 20
75/08/16 14 00
75/09/13 12 10
1604H1
46 54 15.0 115 50 55.0 4
LTTL N FK CLRWATEW RIV
16 15 80EHLS BUTTES
T/DWORSHAK RESERVOIR 130891
TRAIL BRDG .5 MI NW OF FINNS CABIN
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
IG/L
0.048
0.056
0.040
0.005
0.005
0.005
0.005
0.002
00625
TOT KJEL
N
MG/L
0.300
0.100K
1.000
0.650
0.150
0.150
0.450
0.400
00610
NH3-N
TOTAL
MG/L
0.030
0.020
0.035
0.015
0.005
0.015
0.005
0.002
00671
PHOS-OIS
ORTHO
MG/L P
0.005K
0.005K
0.005K
0.015
0.005
0.005K
0.020
0.005
00665
PHOS-TOT
MG/L P
0.005
0.010K
0.010
0.050
0.010K
0.010
0.020
0.030
K VALUE KNOWN TO BE LESS
THAN INDICATED
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STORE! RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/20 10 15
74/11/17 11 00
75/04/12 14 00
75/06/15 11 30
75/06/29 13 05
75/07/19 17 00
75/08/16 12 30
75/09/13 16 10
1604J1
46 51 00.0 115 37 47.0 4
ISABELLA CREEK
16 7.5 THOMPSON PT
T/OWORSHAK RESERVOIR 130R91
TRAIL BROG OFF PVO RD AT ISABELLA LNDING
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&N03
OTAL
!G/L
0.040
0.040
0.065
0.040
0.030
0.015
0.025
0.045
00625
TOT KJEL
N
MG/L
0.100K
0.400
1.100
0.650
0.500
0.100
0.550
0.050
00610
NH3-N
TOTAL
MG/L
0.010
0.035
0.025
0.035
0.030
0.015
0.010
0.002
00671
PHOS-DIS
ORTHO
MG/L P
0.005K
0.005K
0.010
0.005K
0.005
0.005K
0.005K
0.002
00665
PHOS-TOT
MG/L P
0.005K
0.010K
0.010
0.010
0.020
0.010K
0.010K
0.010
K VALUE KNOWN TO BE LESS
THAN INDICATED
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APPENDIX E
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1975
STATE OF IDAHO
Mean or median values for six of the key parameters evaluated
in establishing the trophic conditions of Idaho lakes sampled are
presented to allow direct comparison of the ranking, by parameter,
of each lake relative to the others. Median total phosphorus, median
inorganic nitrogen and median dissolved orthophosphorus levels are
expressed in mg/1. Chlorophyll a_ values are expressed in yg/1.
To maintain consistent rank order with the preceding parameters,
the mean Secchi disc depth, in inches, is subtracted from 500.
Similarly, minimum dissolved oxygen values are subtracted from 15
to create table entries.
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LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
1601 AMERICAN FALLS RESERVOIR
1602 CASCADE LAKE
1603 LAKE COEUR D'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
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
MEDIAN
INOR6 N
0.030
0.060
0.040
0.080
0.075
0.040
0.050
0.070
0.130
0.080
0.060
0.050
0.045
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
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
4.986
15-
MIN DO
14.700
14.800
12.200
7.400
14.800 *
11.800
12.800
14.600
14.700
12.800
9.600
13.600
8.200
MEDU
OISS ORTH
0.035
0.009
0.005
0.009
0.013
0.003
0.012
0.015
0.020
0.007
0.007
0.009
0.004
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PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE MEDIAN MEDIAN 500- MEAN 15- MEDIAN
CODE LAKE NAME TOTAL P INORG N MEAN SEC CHLORA MIN DO DISS ORTHO P
1601 AMERICAN FALLS RESERVOIR 0(0) 17 ( 1) 8(1) 8(1) 21. ( 2) 0 ( 0)
1602 CASCADE LAKE 33 ( 4) 54 (6) 17 ( 2) 42 ( 5) 4(0) 50 ( 5)
1603 LAKE COEUR D'ALENE 67 ( 8) 96 ( 11) 50 (6) 25 ( 3) 67 (8) 83 ( 10)
1604 DWORSHAK RESERVOIR 96 ( ID 17 (1) 25 ( 3) 83 ( 10) 100 ( 12) 50 ( 5)
1605 HAUSER 42 ( 5) 33 ( 4) 75 ( 9) 17 ( 2) 4(0) 25 ( 3)
160* NAYDEN LAKE 96 ( in 96 < ii> 92 ( 11) 75 ( 9) 75 ( 9) 100 ( 12)
1607 ISLAND PARK RESERVOIR 25 ( 3) 71 ( 8) 42 (5) 33 ( 4) 54 (6) 33 ( 4)
1608 LAKE LOWELL 8(1) 42 ( 5) 0(0) 0(0) 33 ( 4) 17 ( 2)
1609 MAGIC RESERVOIR 17 ( 2) 0<0) 33 ( 4) 50 ( 6) 21 ( 2) 8 ( 1)
1610 PALISADES RESERVOIR 50 (6) 17 ( 1) 83 ( 10) 100 (12) 54 ( 6) 75 ( 9)
1611 LOWER PAYETTE 63 ( 10) 54 ( 6) 100 ( 12) 67 (8) 83 ( 10) 67 ( 8)
1612 LONER TWIN LAKES 75 ( 9) 71 ( 8) . 58 ( 7) 92 ( 11) 42 (5) SO < 5)
1613 UPPER TWIN LAKES 58 (7) 83 ( 10) 67 (8) 58 ( 7) 92 ( 11) 92 ( 11)
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