U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
AMERICAN FALLS RESERVOIR
BANNOCK, BINGHAF! & POWER COUNTIES
IDAHO
EPA REGION X
WORKING PAPER No, 776
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
AfERICAN FALLS RESERVOIR
BANNOCK, BINGHAM & POWER COUNTIES
IDAHO
EPA REGION X
WORKING PAPER No, 776
WITH THE COOPERATION OF THE
IDAHO DEPARTMENT OF HEALTH AND WELFARE
AND THE
IDAHO NATIONAL GUARD
JULY, 1977
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REPORT ON AMERICAN FALLS RESERVOIR
BANNOCK, BINGHAM & POWER COUNTIES, 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. 776
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 19
VK Appendices 20
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ii
FOREWORD
The National EutropMcatlon Survey was Initiated 1n 1972 1n
response to an Administration commitment to Investigate the nation-
wide threat of accelerated eutrophicatlon 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 nonpolnt source pollution abatement in lake water-
sheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophicatlon 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 eutrophicatlon 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 1s documented. The report 1s formatted to provide state
environmental agencies with specific Information for basin
planning [§303(e)L water quality criteria/standards review
[§303(c)], 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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AMERICAN FALLS
RESERVOIR
Tributary Sampling Site
X Lake Sampling Site
Sewage Treatment Facility
V.
Pocatello Y
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REPORT ON AMERICAN FALLS RESERVOIR, IDAHO
STORE! NO. 1601
I. CONCLUSIONS
A. Trophic Condition:*
Based upon Survey data, American Falls Reservoir is consid-
ered eutrophic, i.e., nutrient rich and highly productive.
Whether such nutrient enrichment is to be considered beneficial
or deleterious is determined by its actual or potential impact
upon designated beneficial water uses of each lake.
Nutrient levels in American Falls Reservoir were quite
high: of the 13 Idaho lakes sampled in 1975, none had higher
median total phosphorus or orthophosphorus values, and 1 had
higher median inorganic nitrogen levels than this lake. Poten-
tial for primary productivity as measured by algal assay control
yield was high. Chlorophyll a_ levels ranged from 5.3 yg/1 to
45.1 yg/1 with a mean of 15.4 yg/1.
Survey limnologists reported algal blooms at Stations 01
and 02 during August, and algal-related turbidity throughout
the lake on all three sampling occasions. Other studies (Idaho
Department of Natural Resources, et al., 1975; Idaho Department
of Health and Welfare, 1975 and 1976) report turbidity from
agricultural runoff and high bacteria levels are additional
water quality problems in American Falls Reservoir.
*See Appendix E
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B. Rate-Limiting Nutrient:
The algal assay results suggest American Falls Reservoir was
phosphorus limited during spring sampling and colimited during fall.
The lake data indicate primary limitation by nitrogen on all three
sampling occasions.
C. Nutrient Controllability:
During the 1975 sampling year, point sources identified within
40 stream-km (25 miles) of American Falls Reservoir contributed
9.6% of the total phosphorus load. The Pocatello plant contributed
8.0%, Blackfoot contributed 1.4% and Aberdeen was estimated to have
contributed 0.2% of the total load. In addition, substantial
nutrient contributions from the city of Idaho Falls are known to
impact the Snake River. Although nutrient contributions from this
area are not reported in the lake nutrient budget due to the dis-
tance of Idaho Falls from the reservoir, they are included in the
annual phosphorus and nitrogen loadings for the Snake River (Station
A-2).
2
The calculated annual phosphorus loading of 2.20 g P/m /yr
is twice that proposed by Vollenweider (1975) as "eutrophic" for
lakes with such volume and hydraulic retention time. The loading
data suggest that elimination of contributions from known point
sources would still leave high nutrient inputs, and further
reduction in nutrient contributions, including nonpoint, would
probably be necessary to effect lake water quality improvement.
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Examination of land use practices and identification of additional
point sources may provide answers to further nutrient reductions.
2. Nonpoint sources -
The mean annual phosphorus load not attributable to nearby
point sources was about 90.4% of the total reaching American Falls
Reservoir during the sampling year. The Snake River contributed
51.4% of the total, the Portneuf River contributed 32.2%, and
ungaged drainage areas were estimated to have contributed 1.2%
of the total phosphorus load.
The nutrient export rates of the Portneuf River and Spring
Creek were substantially greater during the sampling year than
the other gaged tributaries to American Falls Reservoir (Section
IV-D). The Portneuf River is impacted by a fish hatchery (trout
farm) immediately above sampling Station E-l, and several in-
dustrial ponds further upstream in Pocatello. Further sampling
is needed to determine the significance and potential control-
lability of these unmeasured sources to American Falls Reservoir.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake surface area, mean depth and volume were provided by the
U.S. Geological Survey (USGS) (1972), and Martin and Hanson (1966).
Maximum depth was estimated on the basis of National Eutrophication
Survey (NES) sampling data. Tributary flow data were provided by
the Idaho District office of the 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 NES Working Paper
No. 175. A table of metric/English conversions is included as
Appendix A.
A. Lake Morphometry:
p
1. Surface area: 277.03 km .
2. Mean depth: .9.2 meters.
3. Maximum depth: 16.8 meters.
4. Volume: 2,096.933 x 106 m3.
5. Mean hydraulic retention time: 109 days.
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B. Tributary and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage Mean flow
Name area(km?) (m3/sec)
A-2 Snake River 29,292.9 144.90
B-l Unnamed Stream 271.9 1.21
D-l Danielson Creek 253.3 1.70
E-l Portneuf River 3,367.0 15.80
F-l Bannock Creek 1,020.5 1.09
G-l Spring Creek 69.9 13.58
Minor tributaries and
immediate drainage - 670.9 3.86
Totals 34,946.4 182.14
2. Outlet - A-l Snake River 35,224.0 222.29
C. Precipitation:
1. Year of sampling: 33.3 cm.
2. Mean annual: 27.4 cm.
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III. LAKE WATER QUALITY SUMMARY
American Falls 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 one or more depths at each
station (see map, page v). During each visit, depth-integrated
samples were collected from each station for chlorophyll a_ analysis
and phytoplankton identification and enumeration. During the first
and last visits, 18.9-liter depth-integrated samples were composited
for algal assays. Maximum depths sampled were 15.5 meters at
Station 01, 11.6 meters at Station 02, 9.8 meters at Station 03,
6.4 meters at Station 04, and 2.4 meters at Station 05. 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 a_ determinations are included in III-B. Results of the
limiting nutrient study are presented in III-C.
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AMERICAN FALLS "ESE
STO^ET CO^E 1*01
5/15/7? )
••i AX
AND CHEMICAL CHARACTERISTICS
( 8/ 5/75 )
MAX
S*»o = T DEPTH
PAN'GF
MEDIAN (METERS)
HANG?
9/18/75 )
MAX
= 5 DEPTH
RANGE
MEDIAN (METE»S)
VPFPATJ---E MEO
0.-1.5 M HEPTW
"AX DFPJH**
DISSOLVED 0.-
150.-
0.0?6-0
0. 050-0
0.003-0
0.012-0
0.0?0-0
0.040-0
0.020-0
0.040-0
o.?oo-o
0.400-0
14.3
14.3
13. ft
10.?
364.
364.
S.9
3.8
180.
190.
.311
.311
.14?
.142
.970
.970
.150
.150
.600
.800
I'.l
7.6
iO.r,
«.*
2=>A.
2«3.
R..b
8.h
15-^.
1S6.
0.047
0.0-S
0.011
0 . 0 ] 5
0.040
O.O^o
O.O'O
O.OCQ
0.4nu
0 .4^0
0.0-
o.n-
0.0-
n.O-
0.0-
0.0-
o.O-
0.0-
0.0-
1.0-
0.0-
o.O-
0.0-
0.0-
0.0-
0.0-
0.0-
0.0-
0.0-
0.0-
1.5
15. 5
1.5
15.5
1.5
15.5
1.5
15.5
1.5
15.5
1.5
15.5
1.5
15.5
1.5
15.5
1.5
15.5
1.5
15.5
9
5
9
5
q
5
9
5
9
5'
'•>
5
9
5
5
Q
5
9
5
22.9- 25.1
18.9- 22.9
M.O- 12.0
1.0- 12.0
320.- 335.
310.- 333.
9.6- 9.1
7. ft- 9.1
116.- 147.
140.- 152.
0.035-0. 163
0. 069-0. 25«
0.010-0.040
0.021-0.161
".020-0.020
0.020-0.190
0.020-0.040
0.030-0.460
0.200-0.600
0.300-0.700
23.4
20.0
10.6
7.2
325.
330.
8.9
8.7
140.
147.
0.076
0.119
0.033
0.036
0.020
0.030
0.020
0.140
0.400
0.400
0.0-
2.4-
0.0-
2.4-
0.0-
2.4-
0.0-
2.4-
0.0-
2.4-
0.0-
2.4-
0.0-
2.4-
0.0-
2.4-
0.0-
2.4-
0.0-
2.4-
1.5
14.6
1.5
14.6
1.5
14.6
1.5
14.6
1.5
14.6
1.5
14.6
1.5
14.6
1.5
14.6
1.5
14.6
1.5
14.6
8
5
8
5
8
5
8
5
8
5
8
5
8
5
8
5
4
3
8
5
1*.0- 16.4
14.0- 16.4
5.8- 7.8
4.8- 7.0
358.- 4?f>.
365.- 419.
6.2- 8.3
8.2- 8.4
166.- 189.
166.- 188.
0.139-0.308
0.156-0.319
0.057-0.087
0.047-0.088
0.080-0.380
0.080-0.400
0.200-0.500
0.180-0.570
0.500-1 .100
0.400-1.100
14.4
14.3
6.8
6.4
398.
396.
8.3
8.3
170.
172.
0.170
0.211
0.074
0.079
0.220
0.240
0.325
0.330
0.700
0.800
0.0- 1.5
1.8- 10.7
0.0- 1.5
1.8- 10.7
0.0- 1.5
1.8- 10.7
0.0- 1.5
1.8- 10.7
0.0- 1.5
1.8- 10.7
0.0- 1.5
1.8- 10.7
0.0- 1.5
1.8- 10.7
0.0- 1.5
1.8- 10.7
0.0- 1.5
1.8- 10.7
0.0- 1.5
1.8- 10.7
SECCHI DISC
0.?-
0.-
0.9- 2.1
1.8
0.2- 0.4
0.3
* N = NO. OF SS'^L^
*« MAXIMUM OEPT" SAMPLED AT EACH s
*»« s = NO. OF «;iTts SAMPLED ON THI<; DATE
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B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
05/15,16/75
08/05/75
09/18/75
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Cyclotella
Asterionella
Chroomonas
Diatoma
Nitzschia
Other genera
Total
Apham'zomenon
Fragilaria
Melosira
Navicula
Cyrnbel 1 a
Other genera
Total
Aphanizomenon
Chroomonas
Cryptomonas
Fragilaria
Cyclotella
Other genera
Algal
Units
per ml
4,856
2,147
1,227
562
460
1,279
10,531
3,684
1,505
415
208
156
207
6,175
745
348
248
149
99
100
Total
1,689
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2. Chlorophyll a, -
Sampling Station Chlorophyll a_
Date Number (yg/1)
05/15,16/75 01 17.4
02 19.5
03 23.5
04 6.0
05 6.6
08/05/75 01 24.9
02 5.3
03 12.5
04 45.1
05
09/18/75 01 9.4
02 8.9
03 13.0
04 10.7
05 12.5
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10
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
a. 05/15/75 Stations 01-03
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
Ortho P
Cone, (mg/1)
<0.005
<0.055
<0.055
<0.005
Inorganic N
Cone! (mg/1)
0.020
0.020
1.020
1.020
b. 09/18/75 Stations 04, 05
Ortho P
Spike (mg/1) Cone, (mg/1)
Control 0.060
0.05 P 0.110
0.05 P + 1.0 N 0.110
1.00 N 0.060
Inorganic N
Cone! (mg/1)
0.660
0.660
1.660
1.660
Maximum Yield
(mg/1-dry wt.)
0.2
7.5
16.7
0.2
Maximum Yield
(mg/l-dry wt.)
16.0
15.4
34.7
14.3
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11
2. Discussion -
The control yields of the assay alga, Selenastrum capri-
cornutum, indicate that the potential for primary productivity was
low in American Falls Reservoir during spring (05/15/75) but ex-
tremely high during autumn sampling (09/18/75). In spring, the
addition of orthophosphorus alone produced a significant increase
in yield over that of the control, indicating the sample was phos-
phorus limited at that time. The addition of nitrogen alone did
not result in any increase in yield over that of the control. The
spring assay sample for Stations 04 and 05 was broken during shipment
so is not included in this report.
In autumn, the assay for Stations 04 and 05 did not demonstrate
any significant increase in yield over that of the control with
the addition of either orthophosphorus or nitrogen alone, but the
simultaneous addition of both nutrients produced a substantial
increase in yield, suggesting col imitation by the two nutrients.
The mean inorganic nitrogen to orthophosphorus (N/P) ratios
in the lake data were approximately 8/1, 3/1, and 8/1 in the spring,
summer and fall, respectively, suggesting primary limitation by
nitrogen in American Falls Reservoir on all sampling occasions.
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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 i), except for the high
runoff months of June and July 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 USGS for the tributary sites nearest
the lake.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of a USGS 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" ("II" of USGS) were estimated by using the mean annual
2
nutrient loads, in kg/km /year, in Danielson Creek and Bannock Creek,
at Stations D-l and F-l and multiplying the means by the II area in
km2.
The operators of the Blackfoot and Pocatello wastewater treat-
ment plants provided monthly effluent samples and corresponding flow
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13
data. Nutrient loads for the city of Aberdeen wastewater treat-
ment plant were estimated at 1.134 kg P and 3.401 kg N/Capita/year.
Nutrient loads for the Simplot and FMC plants were calculated
from monthly chemistry data and flow provided by the Idaho Depart-
ment of Health and Welfare, Division of Environment (Michael Smith,
personal communication). It should be noted that calculated annual
total nitrogen loadings do not include NC^-N samples, and may
thus be substantially underestimated.
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A. Waste Sources:
1. Known municipal -
Name
Blackfoot
Pocatello
Aberdeen
Pop.*
Served
10,000
48,000
900
Treatment*
Activated
Sludge
Primary
Clarification
Primary
Clarification
Mean Flow
(m3/d x 103)
3.816
20.445
0.341**
Receiving
Water
Snake River
Portneuf River
Unnamed Stream/
Little Hole Draw
2. Known industrial - ***
Mean Flow
Name Product Treatment (m^/d x IP3)
J.R. Simplot Fertilizer Unknown
FMC Corp. Elemental Unknown
Phosphorus
3.709
7.873
Receiving
Water
Portneuf River
Portneuf River
*Plant operators and/or U.S. EPA, 1971.
**Estimated at 0.3785 m3/capita/day.
***Mike Smith, personal communication.
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15
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
% of
Source kg P/yr total
a. Tributaries (nonpoint load) -
A-2 Snake River 313,395 51.4
B-l Unnamed Stream 5,295 0.9
D-1 Danielson Creek 2,265 0.4
E-l Portneuf River 88,370 14.5
F-l Bannock Creek 13,125 2.1
G-l Spring Creek 9,110 1.4
b. Minor tributaries and immediate
drainage (nonpoint load) - 7,380 1.2
c. Known municipal STP's -
Blackfoot 8,535 1.4
Pocatello 48,540 8.0
Aberdeen 1,020 0.2
d. Septic tanks* - <5 <0.1
e. Known industrial -
Simplot 94,790 15.5
FMC 13,340 2.2
f. Direct precipitation** - 4.850 0.8
Totals 610,015 100.0%
2. Output - A-l Snake River - 577,365
3. Net annual P accumulation - 32,650
*Estimated based on 5 lakeshore residences.
**Estimated (See NES Working Paper No. 175).
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16
Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kg N/yr total
a. Tributaries (nonpoint load) -
A-2 Snake River 5,419,255 66.3
B-l Unnamed Stream 36,525 0.4
D-l Danielson Creek 90,065 1.1
E-l Portneuf River 847,885 10.4
F-l Bannock Creek 61,750 0.8
G-l Spring Creek 571,225 7.0
b. Minor tributaries and immediate
drainage (nonpoint load) - 139,545 1.7
c. Known municipal STP's -
Blackfoot 19,805 0.2
Pocatello 248,260 3.0
Aberdeen 3,060 <0.1
d. Septic tanks* - 55 <0.1
e. Known industrial -
Simplot 425,575 5.2
FMC 16,615 0.2
f. Direct precipitation** - 299.080 3.7
Totals 8,178,700 100.0%
2. Outputs - A-l Snake River - 12,267,495
3. Net annual N export*** - 4,088,795
*Estimate based on 5 lakeshore residences.
**Estimated (See NES Working Paper No. 175).
***Export probably due to unmeasured point sources and/or sampling error.
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17
D. Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
2 2
Tributary kg P/km /yr kg N/km /yr
Snake River 11 185
Unnamed Stream 19 134
Danielson Creek 9 356
Portneuf River 26 252
Bannock Creek 13 60
Spring Creek 130 8,172
E. Mean Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total N
Tributary (mg/1) (mg/1)
C-l Unnamed Stream 0.209 1.715
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18
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 "mesotrophic11 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/nr/yr)
Estimated loading for American Falls Reservoir 2.20
Vollenweider's "eutrophic" loading 1.08
Vollenweider's "oligotrophic" loading 0.54
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19
V. LITERATURE REVIEWED
Idaho Department of Health and Welfare. 1975. Idaho Water Quality
Status. Division of Environment, Boise, Idaho.
Idaho Department of Health and Welfare. 1976. Statewide Water
Quality Management Planning Report. Division of Environment,
Bureau of Water Quality, Boise, Idaho.
Idaho Department of Water Resources, Department of Health and
Welfare, Department of Fish and Game, Department of Budget,
Policy Planning and Coordination. 1975. Idaho Environmental
Review. Boise, Idaho.
Martin, R.O.R. and Ronald L. Hanson. 1966. Reservoirs in the
U.S. Geological Survey Water Supply Paper No. 1838. U.S.
Government Printing Office, Washington, D.C.
Smith, Michael A. 1977. Personal communication. (Industrial
treatment plants). Idaho Department of Health and Welfare,
Division of Environment, Bureau of Water Quality. Boise, Idaho.
U.S. Department of Interior, Geological Survey. 1972. Water
Resource Data for Idaho, Part I. Surface Water Records. Boise,
Idaho.
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 Eutrophica-
tion 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.
-------
20
VI. APPENDICES
APPENDIX A
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 motors/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 B
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLO* INFORMATION FOR IDAHO
LAKE CODE 1601 AMERICAN FALLS RES.
TOTAL DRAINAGE AREA OF LAKE(SO KM) 35224.0
08/23/76
TRIBUTARY
KM)
JAN
FEB
MAR
APR
NORMALIZED FLOWS(CMS)
JUN JUL AUG
SEP
OCT
NOV
DEC
MEAN
1601*1
1601A?
1601H1
160101
1601E1
1601F1
1601G1
1601Z7
35224.0
2929?. 9
271.9
253.3
3367. n
1020.5
69.9
947.9
114.12
100.81
0.99
1.70
16.68
1.10
13.38
3.60
133.66
121.76
0.99
1.64
19.11
1.90
13.59
3.79
130.82
143.57
0.99
1.59
20.30
1.73
13.31
3.65
260.80
231.35
1.13
1.53
24.66
1.30
13.03
3.62
399.27
296.76
1.56
1.56
23.42
1.13
13.03
4.11
395.02
278.64
1.70
1.70
13.99
0.82
13.25
4.33
372.37
114.68
1.19
1.70
7.65
0.71
12.97
3.71
325.36
73.34
1.33
1.78
8.33
0.74
13.22
3.99
222.29
73.91
1.33
1.78
10.79
0.74
13.99
3.99
130.54
91.46
1.19
1.81
13.42
0.91
14.16
3.91
82.40
104.77
1.13
l.«4
15.43
1.02
14.44
3.94
94.58
109.02
0.99
1.81
16.17
1.08
14.16
3.74
22?. ?9
1*4.90
1.21
1.70
15. BO
1.09
13.58
3.86
SUMMARY
TOTAL DRAINAGE AREA OF LAKE =
SUM OF SUB-DRAINAGE AREAS =
35224.0
35223.5
TOTAL FLOW IN
TOTAL FLOW OUT
2187.55
2661.22
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR MEAN FLOW DAY
1601A1
FLOW DAY
FLOW DAY
FLOW
1601A2
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
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
121.621
98.486
137.167
178.821
194.452
280.988
414.842
492.713
409.461
342.634
317.432
258.618
117.090
151.099
139.687
133.995
128.502
203.287
345.465
427.584
314.317
56.549
90.925
57.257
20
n
15
11
9
9
11
4
6
17
8
14
2n
11
21
n
R
Q
2n
4
18
9
13
14
78.154
70.792
139.319
173.299
J97.368
154.893
475.723
450.238
521.030 21
362.456 27
353.960
260.232
129.974
159.707
145.549
136.204
122.895
131.673
396.436
404.931 19
268.444 30
407.762 17
36.246
46.156
396.436
351.129
495.545
156.875
236.729
31
106.755
-------
TRIBUTARY FLO* INFORMATION FOR IDAHO
08/23/76
LAKE CODE 1601 AMERICAN FALL?
MEAN "ONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY
160iSi
1601D1
1601E1
1601F1
MONTH YEAP
t A
1 '/
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
a
9
10
11
12
1
2
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
74
74
74
75
75
75
75
75
75
75
75
75
74
74
74
75
75
75
75
75
75
75
75
75
MEAN FLOW DAV
FLOW DAY
FLOW DAY
FLOW
0.283
1.227
0.170
0.170
0.170
0.170
0.227
0.283
1.359
1.246
1.216
1.784
1.699
1.727
1.699
1.586
1.529
1.472
1.416
1.388
1.557
1.614
1.671
1.671
14.980
17.726
17.245
17.783
18.094
22.597
15.348
39.729
37.265
16.197
14.073
14.017
1.642
1.841
1.812
1.841
1.841
2.067
2.124
2.342
2.888
1.883
1.529
2.056
20
11
15
11
9
9
13
4
6
17
8
14
20
11
21
11
fl
9
20
1ft
18
e>
fl
14
20
11
15
10
9
9
13
4
6
17
8
14
20
1)
15
11
9
q
13
4
ft
17
D
14
0*263
0.227
0.170
0.170
0.170
0.170
0.227
0.057
1.048 21
1.076 27
1.274
1.812
1.699
1 .727
1.699
1.586
1.529
1.472
1.416
1.388
1.557 21
1.614 17
1.642 13
1.671
15.574
17.556
16.933
17.556
17.953
24.551
22.229
30.554
49.271 21
14.611 27
14.215
13.875
1.699
1.812
1.784
1.812
1.841
2.152
2.039
1.841
2.917 21
1.671 27
1.529
2.067
1.586
1.133
1.586
1.614
1.642
31.545
12.969
2.888
1.529
30
1.699
30
31
1.642
1.642
-------
TRIBUTARY FLOW INFORMATION FOR IDAHO
08/23/76
LAKE CODE 1*<51 i«E~IC**, pALLS RES.
MEAN MONTHLY -LOWS i'
11
12
1
2
3
4
5
6
7
8
9
74
7*
74
75
75
75
75
75
75
75
75
75
FLOW DAY
13.875
14.158
13.875
13.592
13.451
13.167
13.026
13.026
13.167
12.714
13.0B2
14.130
20
10
21
11
fl
9
n
18
i«
9
13
14
FLOW DAY
FLOW DAY
FLOW
13.875
14.130
13.875
13.734
13.535
13.366
13.026
13.026
13.196
12.884
12.828
14.130
20
30
17
13.026
13.252
12.544
31
12.601
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/05/15 16 25 0000
16 25 0005
16 25 0015
16 25 0030
16 25 0051
75/08/05 12 10 0000
12 10 0005
12 10 0015
12 10 0030
12 10 0048
75/09/18 10 00 0000
10 00 0005
10 00 0015
10 00 0035
00010
HATER
TEMP
CENT
00300
00
MG/L
13.4
11.6
10.4
9.1
7.6
23.9
22.9
22.4
21.5
18.9
14.4
14.4
14.3
14.1
11.6
13.8
12.0
11.2
9.6
8.0
9.2
8.2
0.3
6.6
6.8
5.8
5.8
4.8
00077 00094
THANSP CNDUCTVY
«;ECCHI FIELD
INCHES MICROMHO
60
78
15
313
290
288
279
328
320
320
314
312
397
398
398
399
160101
42 47 15.0 112 52 15.0 3
AMERICAN FALLS RESERVOIR
16077 IDAHO
130691
11EPALES
0055
00400
PH
SU
8.20
8.30
8.30
8.40
8.30
8.60
8.70
8.60
8.70
7.80
8.20
8.30
8.20
8.35
FEET 0
00410
T ALK
CAC03
MG/L
146
14ft
149
152
155
140
141
145
155
152
172
172
172
172
2111202
DEPTH CLASS 00
00610
NH3-N
TOTAL
MG/L
0.0?0
0.020K
0.020K
0.020
0.050
0.040
0.020K
0.030
0.690
0.290
0.320
0.330
0.480
0.330
00625
TOT KJEL
N
MG/L
0.500
0.200
0.300
0.400
0.400
0.200K
0.300
0.200
0.800
0.700
0.700
0.700
0.900
o.aoo
00630
NO2J.N03
N-TOTAL
MG/L
0.070
0.020K
0.020K
0.020K
0.040
0.020K
0.020K
0.020K
0.020K
0.020K
0.090
0.080
O.OflO
0.080
00671
PHOS-DIS
ORTHO
MG/L P
0.005
0.004
0~.003
0.013
0.015
0.036
0.033
0.043
0.286
0.138
0.081
0.087
0.098
0.088
00665
DATE TIME DEPTH PHOS-TOT
FROM OF
TO DAY FEET MG/L P
75/05/15
75/08/05
75/09/18
16
16
16
16
16
12
12
12
12
12
10
10
10
10
25
25
25
25
25
10
10
10
10
10
00
00
00
00
0000
0005
0015
0030
0051
0000
0005
0015
0030
004S
0000
0005
0015
0035
0.
0,
0.
0.
0.
0.
0,
0,
0,
0.
0,
0,
0.
0,
,051
,044
,043
,042
.050
.060
,068
.069
.316
.258
,162
,139
,187
,156
32217
CHLRPHYL
A
UG/L
17.4
24.9
9.4
00031
INCDT LT
RFMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/0^/25
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
160103
42 50 32.0 112 49 52.0 3
AMERICAN FALLS RESERVOIR
16077 IDAHO
130691
DATE
FROM
TO
75/05/16
75/08/05
75/09/18
TIME
OF
DAY
09
09
09
09
17
17
17
17
09
09
09
09
DEPTH
FEET
25
25
25
25
45
45
45
45
40
40
40
40
0000
0005
0021
0038
0000
0005
0015
0038
0000
0005
0015
0023
00010
WATER
TEMP
CENT
11.1
11.2
9.2
7.3
24.0
24.0
21.8
20.0
14.3
14.4
14.4
14.3
00665
DATE
FRO*1
TO
75/05/16
75/08/05
75/09/18
TIME DEPTH
OF
DAY
09
09
09
09
17
17
17
17
09
09
09
09
25
25
25
25
45
45
45
45
40
40
40
40
FEET
0000
0005
0020
0038
0000
0005
0015
0038
0000
0005
0015
0023
PHOS-TOT
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
.036
.037
.038
.057
.035
.076
.188
.228
.179
.154
.164
.163
00300
DO
MG/L
10.
11.
11.
10.
8.
10.
4.
1.
7.
6.
6.
6.
32217
11EPALES
0042 FEET 0
00077 00094 00400 00410
TRANSP CNDUCTVY PH T ALK
SECCHI FIELD CAC03
6
8
2
2
2
8
4
0
8
4
2
2
CHLRPHYL
A
UG/L
19.
5.
8.
5
3
9
INCHES MICROMHO
42 293
294
284
275
84 330
320
330
330
12 396
400
398
396
00031
INCDT LT
REMNING
PERCENT
K VALUE KNOWN TO BE
THAN INDICATED
su
8
8
8
8
8
8
8
7
8
8
8
8
.90
.90
.80
.85
.60
.90
.00
.90
.25
.35
.35
.40
MG/L
150
150
153
156
116
142
150
149
189
167
168
166
LESS
2111202
n ACC nn
00610
NH3-N
TOTAL
MG/L
0.030
0.020K
0.020K
0.040
0.020K
0.020K
0.430
0.460
00625
TOT KJEL
N
MG/L
0.600
0.400
0.400
0.400
0.200
0.4QO
0.600
0.700
0.700
0.700
0.600
0.700
00630 00671
N02&N03 PHOS-DIS"
N-TOTAL ORTHO
MG/L MG/L P
0.020K
.0.020K
O.P20K
0.040
0.020K
0.020K
0.040
0.030
0.240
0.100
0.090
0.090
0.014
(X.003
0.013
0.012
0.010~
0.025
0.158
0.161
0.075
0.085
0.083
0.081
-------
STORET RETRIEVAL DATE 76/08/25
NATL F.UTROPHICATION SURVEY
EPA-LAS VEGAS
DATE
FROM
TO
75/05/16
75/08/05
75/09/18
00010
TIME DEPTH WATER
OF TEMP
DAY FEET
09
09
09
09
18
18
18
18
09
09
09
45
45
45
45
15
15
15
15
10
10
10
0000
0005
0020
0032
0000
0005
0015
0026
0000
0005
0012
CENT
12.1
12.1
11.4
7.5
25.1
23.1
22.4
20.1
14.0
14.0
14.Q
00300
DO
MG/L
11.4
10.8
10.4
8.4
11.8
10.6
6.6
11.2
6.8
6.4
6.4
00077
TRANSP Ch
SECCHI FIELD
INCHES MI
36
72
160103
42 54 12.0 112 46 *0.0 3
AMERICAN FALLS RESERVOIR
16077 IDAHO
130691
11EPALES
0036 FEET
DEPTH
2111202
CLASS 00
94
TVY
MHO
302
290
296
283
330
320
322
330
423
426
419
00400
PH
SU
8.80
8.60
8.65
8.65
8.90
9.00
8.30
9.10
8.30
8.23
8.25
00410
T ALK
CAC03
MG/L
150
152
150
159
140
140
147
141
166
167
188
00610
NH3-N
TOTAL
MG/L
0.020K
0.020K
0.020K
0.060
0.040
0.040
0.170
0.040
00625
TOT KJEL
N
MG/L
0.400
0.400
0.400
0.400
0.400
0.600
0.400
0.400
0.600
0.600
0.900
00630
N02&N03
N-TOTAL
MG/L
0.040
0.040
0.040
0.050
0.020K
0.020K
0.140
0.040
0.240
O.?40
0.240
00671
PHOS-01S
ORTHO
MG/L P
0.014
0.013
0.013
0.015
0.040
0.035
0.046
0.021
0.070
0.073
0.079
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/05/16 09 45 0000
09 45 0005
09 45 0020
09 45 0032
75/08/05 18 15 0000
18 15 0005
18 15 0015
18 15 0026
75/09/18 09 10 0000
09 10 0005
09 10 0012
0665
S-TOT
/L P
0.049
0.045
0.052
0.058
0.104
0.132
0.070
0.069
0.159
0.187
0.214
32217
CHLRPHYL
A
UG/L
23.5
12.5
13.0
00031
INCDT LT
PFMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHIC&TION SURVEY
EPA-LAS VEGAS
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/05/16 10 15 0000
10 15 0005
10 15 0010
75/08/05 18 35 0000
18 35 0005
18 35 0015
18 35 0021
75/09/18 09 05 0000
09 05 0007
160104
42 58 00.0 112 44 13.0 3
AMERICAN FALLS RESERVOIR
16077 IDAHO
130691
11EPALES
0014 FFFT
DEPTH
2111202
n &<;<; nr>
00010
WATER
TEMP
CENT
00300
DO
MG/L
00077
TRANSP
«ECCHI
INCHES
00094
CNDUCTVY
FIELD
MICROMHO
00400
PH
su
00410
T ALK
CAC03
HG/L
00610
NH3-N
TOTAL
MG/L
00625
TOT KJEL
N
MG/L
00630 00671
N02&N03 PHOS-DIS
N-TOTAL ORTHO
MG/L MG/L P
13.2
13.1
12.8
23.4
23.1
19.2
19.2
16.4
16.4
9.8
8.2
8.2
10.4
10.6
2.0
7.2
7.0
7.0
24
36
10
296
296
292
320
325
300
310
381
382
8.50
8.45
8.50
9.00
8.90
8.30
8.70
8.25
8.30
149
150
141
137
13fl
140
176
175
0.030
0.040
0.020
0.020
0.130
0.14Q
0.200
0.180
0.300
0.400
O.SOO
0.500
0.400
0.400
0.500
0.400
O.?00
0.220
0.020K
0.020
0.180
0.190
0.380
0.400
0.009
0.014
0.028
0.012
0.034
0.036
0.057
0.047
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
75/05/16 10 15 0000 6.0
10 15 0005 0.058
10 15 0010 0.072
75/08/05 18 35 0000 0.106 45.1
18 35 0005 0.064
18 35 0015 0.114
18 35 0021 0.119
75/09/13 09 05 0000 0.191 10.7
09 05 0007 0.211
00031
INCDT LT
REMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/06/25
NATL EUTROPHICATION SUSVEY
EPA-LAS VEGAS
DATE TIME DEPTH
FPOM OF
TO DAY FEET
75/05/16 10 35 0000
75/08/05 17 00 0000
17 00 0008
75/09/18 09 30 0000
09 30 0006
00010
XATER
TEMP
CENT
14.3
24.4
22.9
15.6
15.5
00300
DO
MG/L
7.4
12.0
12.0
7.0
7.0
00077
TRANSP
SECCHI
INCHES
160105
42 56 20.0 112 41 02.0 3
AMERICAN FALLS RESERVOIR
16077 IDAHO
130691
11EPAUES
0006 FEET
DEPTH
2111202
CLASS 00
7
P
I
S
9
48
8
00094
CNDUCTVY
FIELD
MICROMHO
364
335
333
358
365
00400
PH
su
8.75
9.10
9.10
8.20
8.20
00410
T ALK
CAC03
MG/L
180
147
147
168
172
00610
NH3-N
TOTAL
MG/L
0.150
0.040
0.030
0.500
0.570
00625
TOT KJEL
N
MG/L
0.800
0.500
0.300
1.100
1.100
00630
N02&N03
N-TOTAL
MG/L
0.970
0.020K
0.020K
0.200
0.250
00671
PHOS-DIS
ORTHO
MG/L P
0.142
0.034
0.027
0.074
0.072
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
75/05/16 10 35 0000 0.311 6.6
75/08/05 17 00 0000 0.163
17 00 0008 0.105
75/09/18 09 30 0000 0.308 12.5
09 30 0006 0.319
00031
INCDT LT
RFMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
STORET RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
1601A1
42 46 40.0 112 52 25.0 4
SNAKE RIVER
16 7.5 AMERICAN FLS
0/AMERICAN FALLS RES 130691
FOOTBRDG BETWEEN DAM AND PHRHOUSE
11EPALES 2111204
0000 FEET DEPTH CLASS 00
DATE
FROM
TO
74/10/20
74/11/11
74/12/15
75/01/11
75/02/09
75/03/09
75/04/13
75/05/04
75/06/06
75/06/21
75/07/17
75/07/27
75/08/08
75/09/14
TIME DEPT
OF
DAY FEET
11
15
10
08
14
14
13
14
11
16
18
10
11
13
00
26
45
20
00
00
45
00
05
05
00
50
30
45
00630 00625
H N02&N03 TOT KJEL
N-TOTAL N
MG/L
31
0
0
0
0
0
n
0
0
0
0
.200
.336
.168
.152
.312
.220
.185
.060
.045
.030
.040
0.015
0
0
.025
.090
MG/L
1.
1.
1.
0.
1.
0.
1.
0.
0.
0.
0.
0.
0.
3.
500
800
500
600
000
550
250
300
700
500
450
500
550
000
00610 00671 00665
MHS-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
120
045
025
050
056
085
020
020
065
124
200
055
190
115
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.025
.020
.010
.010
.016
.025
.010
.005
.031
.035
.100
.040
.110
.080
MG/L P
0.110
0.070
0.050
0.030
0.030
0.070
0.090
0.040
0.050
0.040
0.135
0.070
0.140
0.270
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
1601A2
43 07 40.0 112 30 43.0 4
SNAKE RIVER
16 7.5 ROCKFORD
T/AMERICAN FALLS RES
130691
FERRY BUTTE RO BROG 10 M S* OF BLACKFOOT
11EPALES 2111204
DATE TIME DEPTH N028.N03
FRO" OF
TO HAY FEET
74/10/20
74/11/11
74/12/21
75/01/11
75/02/08
75/03/09
75/04/20
75/05/04
75/06/18
75/06/30
75/07/17
75/08/13
75/09/14
15 10
09 30
11 05
15 12
14 35
08 30
09 45
15 15
20 32
18 16
19 15
20 25
14 15
0630
8.N03
OTAL
G/L
2.160
0.104
0.208
0.256
0.410
0.175
0.130
0.220
0.110
0.065
0.115
0.065
0.070
00625
TOT KJEL
N
MG/L
0.600
1.700
0.800
0.700
1.300
1.400
1.600
1.350
0.500
0.350
0.450
0.350
0.200
00610
NH3-N
TOTAL
MG/L
0.015
0.030
0.020
0.035
0.480
0.050
0.035
0.025
0.035
0.015
0.040
0.015
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.005
0.010
0.010
0.015
0.024
0.020
0.010
0.035
0.025
0.020
0.030
0.015
0.010
00665
PHOS-TOT
MG/L P
0.040
0.020
0.020
0.020
0.050
0.180
0.060
0.230
0.090
0.050
0.130
0.040
0.040
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- L*S VEGAS
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/20
74/11/11
74/12/15
75/01/11
75/02/09
75/03/09
75/04/13
75/05/04
75/06/06
75/06/21
75/07/17
75/07/27
75/08/08
75/09/14
09 20
14 47
11 30
08 50
14 30
14 40
14 20
14 25
11 35
16 37
18 30
11 20
14 00
14 10
160181
42 55 28.0 112 48 35.0 4
UNNAMED STREAM
16 7.5 ABERDEEN
T/AHERlgAN FALLS RES
SEC RD BRDG 2 MI SE OF ABERDEEN
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
«,N03
OTAL
G/L
0.600
1.290
1.440
0.040
1.300
1.650
0.760
0.760
0.315
0.290
0.440
0.410
0.345
0.240
00625
TOT KJEL
N
MG/L
1.500
2.100
3.400
2.500
2.900
1.300
2.400
2.700
0.850
0.875
0.400
0.800
0.450
0.300
00610
NH3-N
TOTAL
MG/L
0.040
0.350
0.700
0.025K
0.624
0.560
0.350
0.670
0.055
0.075
0.035
0.030
0.060
0.025
00671
PHOS-DIS
ORTHQ
MG/L P
0.040
0.290
0.315
0.345
0.400
0.390
0.440
0.100
0.095
0.135
0.135
0.120
0.060
00665
PHOS-TOT
MG/L P
0.110
0.380
0.600
0.580
0.710
0.460
0.540
0.780
0.190
0.170
0.170
0.170
0.140
0.100
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORE! RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&.N03
FROM OF
TO DAY FEET
74/10/20
74/11/11
74/12/21
75/01/11
75/02/08
75/03/09
75/04/20
75/05/18
75/06/18
75/06/30
75/07/17
75/07/31
75/08/13
75/09/14
14 05
10 25
10 30
14 38
15 10
09 01
10 25
14 30
19 45
18 45
18 40
11 40
19 45
14 45
1601C1
43 03 42.0 112 43 15.0 4
UNNAMED STREAM
16 7.5 SPRINGFIELD
T/AMERICAN FALLS RES 130691
SEC RD BRDG 2.5 MI SW OF SPRINGFIELD
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
6.N03
OTAL
G/L
0.254
0.280
0.352
0.600
0.220
0.375
0.525
0.250
0.045
0.065
0.750
0.100
0.010
0.030
00625
TOT KJEL
N
MG/L
0.300
1.700
l.SOO
1.200
2.300
2.300
1.150
2.300
1.050
1.400
0.100
2.300
0.750
1.000
00610
NH3-N
TOTAL
MG/L
0.045
0.173
0.230
0.178
0.192
0.275
0.045
0.115
0.035
0.060
0.025
0.035
0.035
0.025
00671
PHOS-DIS
ORTHO
MG/L P
0.040
0.060
0.100
0.065
0.088
0.097
0.045
0.045
0.070
0.095
0.010
0.120
0.060
0.040
00665
PHOS-TOT
MG/L P
0.120
0.100
0.210
0.180
0.240
0.180
0.110
0.330
0.310
0.325
0.010
0.190
0.120
0.500
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&.N03
FROM OF
TO DAY FEET
74/10/20
74/11/11
74/12/21
75/01/11
75/02/08
75/03/09
75/04/20
75/05/18
75/06/18
75/06/21
75/07/17
75/07/31
75/08/13
75/09/14
14 30
10 05
10 50
14 20
15 00
08 50
10 15
11 40
19 55
18 37
19 50
11 55
19 55
15 00
1601D1
43 03 35.0 112 41 22.0 4
DANIELSON CREEK
16 7.5 SPRINGFIELD
T/AMERICAN FALLS RES 130691
SEC RO BRDG 1.5 MI S OF SPRINGFIELD
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630
&.N03
OTAL
'G/L
0.880
0.880
1.080
1.120
1.060
0.960
0.890
0.800
0.710
0.560
0.620
0.540
0.470
0.575
00625
TOT KJEL
N
MG/L
0.600
1.500
0.800
0.600
0.900
1.150
1.100
0.700
0.900
0.350
0.250
1.200
0.650
1.400
00610
NH3-N
TOTAL
MG/L
0.075
0.420
0.175
0.133
0.064
0.085
0.030
0.040
0.035
0.025
0.030
0.040
0.025
0.030
00671
PHOS-DIS
ORTHO
MG/L P
0.020
0.030
0.030
0.030
0.032
0.025
0.015
0.020
0.015
0.015
0.020
0.020
0.020
0.010
00665
PHOS-TOT
MG/L P
0.030
0.050
0.060
0.060
0.050
0.040
0.060
0.060
0.030
0.020
0.030
0.030
0.040
0.030
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATIO* SURVEY
EPA- LAS VEGAS
1601E1
42 32 40.0 112 56 07.0 *
PORTNEUF RIVER
16 7.5 MICHAUO
T/AMERICAN FALLS RES
130691
DATE
FROM
TO
74/10/20
74/11/11
74/12/15
75/01/10
75/02/09
75/03/09
75/04/13
75/05/04
75/06/06
75/06/21
75/07/17
75/07/27
75/08/08
75/09/14
TIME
OF
DAY 1
11 35
16 27
09 00
19 00
12 45
12 45
13 05
12 47
10 00
15 15
16 55
10 00
12 30
15 10
FEET
00630
NOP&N03
N-TOTAL
MG/L
.480
.380
.480
.060
.450
1.300
1.400
1.350
0.590
0.920
1.400
1.570
1.500
1.570
00625
TOT KJEL
N
MG/L
0.800
2.700
1.300
0.500
1.600
1.850
3.750
5.160
0.800
1.500
1.200
1.000
1.300
1.700
00610
NH3-N
TOTAL
MG/L
0.370
0.430
0.210
0.042
0.315
0.450
1.300
1.650
0.183
0.320
0.580
0.330
0.600
0.875
00671
PHOS-DIS
ORTHO
MG/L P
0.200
0.480
0.250
0.040
0.870
0.250
0.240
1.450
0.097
0.145
0.330
0.310
0.320
0.318
00665
PHOS-TOT
MG/L P
0.260
0.600
0.320
0.080
0.990
0.490
0.370
1.800
0.250
0.320
0.440
0.370
0.380
0.370
SIPHON RD BRDG ? MI NE OF POCATELLO ARPT
11EPALES 2111204
nnnn cpcr nrp-ru £i_SSS 00
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N03S.N03
FROM OF
TO DAY FEET
74/10/20
74/11/11
74/13/15
75/01/10
75/02/09
75/03/09
75/04/13
75/05/04
75/06/06
75/06/21
75/07/17
75/07/27
75/08/08
75/09/14
11
16
09
17
13
13
12
13
10
15
17
10
12
15
21
16
25
50
00
00
47
06
15
30
05
10
45
00
1601E2
42 31 10.0 112 54 47.0 4
PORTNEUF RIVER
16 7.5 MICHAUD
T/AMERICAN FALLS RES 130691
2ND BROS .4 MI E OF US HWY 30 JCT
11EPALES 2111204
0000 FEET DEPTH CLASS 00
0630 00625
S.N03 TOT KJEL
OTAL N
G/L MG/L
0.720 1
0.84Q
1.060
0.040
0.970
0.810
0.830
1.400
.700
.100
.800
.600
.650
.000
0.990 3.180
0.315 I
1.150
0.525 0.800
0.490 0.400
0.430 0.500
0.730 0.750
0.540 0.500
00610 00671 00665
NH3-N PHOS-OIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
040
055
055
025K
060
085
060
065
055
035
020
010
070
030
MG/L P
0
0
0
0
0
0
0
0
0
0
.030
.035
.020
.025K
.060
.085
.040
.115
.045
.050
0.045
0
0
0
.030
.080
.020
MG/L P
0.080
0.070
0.090
0.150
0.350
0.210
0.170
0.220
0.090
0.070
0.200
0.060
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOffET RETRIEVAL DATE 76/08/25
NATL I-UTROPHICATIO" SURVEY
EPA- LAS VEGAS
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/10/20
74/11/11
74/12/15
75/01/11
75/08/09
75/03/09
75/04/13
75/05/04
75/06/06
75/06/21
75/07/17
75/07/27
75/08/08
75/09/14
10 50
15 58
10 15
07 55
13 15
13 30
15 30
12 25
10 35
15 25
17 20
10 30
13 00
13 00
1601F1
42 52 37.0 112 37 52.0 4
BANNOCK CREEK
16 7.5 SCHILLER
T/AMERICAN FALLS RES 130691
SEC RO BRDG 1 MI SE JCT W 1-15*
11EPALES 2111204
0000 FEET DF.PTH CLASS 00
0630
6.N03
OTAL
G/L
0.176
0.280
0.352
0.008
0.375
0.390
0.470
0.400
0.440
0.640
1.150
1.200
1.150
1.150
00625
TOT KJEL
N
MG/L
0.500
1.450
1.000
0.700
1.400
2.500
2.600
0.500
1.700
0.800
1.150
1.250
0.900
0.800
00610
NH3-N
TOTAL
MG/L
0.020
0.370
0.070
0.005K
0.096
0.145
0.050
0.015
0.050
0.100
0.125
0.200
0.155
0.220
00671
PHOS-DIS
ORTHO
MG/L P
0.020
0.035
0.030
0.005K
0.045
0.135
0.100
0.055
0.065
0.095
0.175
0.230
0.175
0.165
00665
PHOS-TOT
MG/L P
0.080
0.120
0.100
0.054
0.350
1.200
0.960
0.390
0.540
0.290
0.270
0.380
0.330
0.270
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
160161
43 02 36.0 112 33 15.0 4
SPRING CREEK
16 7.5 PINGREE
T/AMERICAN FALLS RES 130691
SHEEPSKIN RO BRD6 6 MI H OF FORT HALL
11EPALES 2111204
0000 FEET DEPTH CLASS 00
DATE
FROM
TO
74/10/20
74/11/10
74/12/21
75/01/11
75/02/08
75/03/09
75/04/20
75/05/18
75/06/18
75/06/30
75/07/17
75/07/31
75/08/13
75/09/14
TIME DEPTH
OF
DAY FEET
15
08
11
13
14
07
09
15
21
17
19
12
20
13
50
45
30
40
00
55
15
40
05
43
40
45
50
20
00630 00625
N02S.N03 TOT KJEL
N-TOTAL N
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
840
850
840
008
800
810
860
720
760
710
,0.055_
0.
0.
0.
730
730
750
MG/L
0.200
1.000
1.400
0.400
2.200
0.450
0.150
0.600
0.300
0.100
1*150
0.500
0.250
0.500
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
•
•
•
•
•
•
*
•
•
•
•
*
•
•
015
050
030
005K
040
030
020
020
035
015
110
025
015
045
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
015
015
015
005K
008
010
005
010
010
010
165
020
010
015
MG/L P
0.020
0.015
0.020
0.030
0.020
0.020
0.010
0.020
0.030
0.010
0*320,
0.030
0.020
0.030
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/08/25
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
1601AA AS1601AA P010000
43 13 00.0 112 22 00.0 4
BLACKFOOT
16 15 BLACKFOOT
T/AMERICAN FALLS RES 130691
SNAKE RIVER
11EPALES 2141204
0000 FEET DEPTH CLASS 00
DATE
FROM
TO
75/01/22
CP(T>-
75/01/23
T5/02/27
75/03/25
cpm-
75/03/26
75/04/29
75/06/26
CP(T>-
75/06/27
75/07/30
75/09/08
75/10/15
75/11/20
cpm-
75/11/20
75/12/17
76/01/19
TIME DEPTH
OF
DAY FEET
08
08
08
08
04
08
08
00
00
00
00
00
00
00
00630 00625
N03&N03 TOT KJEL
N-TOTAL N
MG/L MG/L
0
3
3
6
.550
.000
.920
.900
4.900
08
08
20
16
08
08
08
08
00 -„,.
00
00
00
00
00
00
00
3
9
24
13
4
1
- - ;, '•' — - '
.600
.600
.000
.800
.900
.700
20.000
8.400
6.300
3.400
10.500
. . .
12.000
2.100
2.900
3.000
3.300
7.000
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L MG/L P MG/L P
4
0
0
0
0
.-^
0
0
0
0
0
0
.700
.100
.044
.050K
.035
.340
.025K
.096
.030
.025K
.075
3.810
2.300
5.380
5.200
4.600
3.600
4.300
9.700
6.675
6.100
4.000
9.300
2.500
5.800
5.600
4.800
. ... , ,
4.200
4.300
10.000
7.300
8.300
5.800
50051
FLOW
RATE
INST MOD
0.970
0.950
1.040
0.969
1.060
. „.' -.,.-.
. 1.200
1.280
1.100
0.910
1.030
0.970
50053
CONDUIT
FLOW-MGD
MONTHLY
0.930
0.950
0.920
1.000
1.140
.
1.060
1.250
1.200
0.890
0.850
0.900
1C VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORE! RETRIEVAL DATE 76/08/35
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
1601EA PR1601EA P048000
42 54 55.0 11? 31 00.0 4
POCATELLO
16 7.5 MICHAUD
T/AMERICAN FALLS RES 130691
PORTNEUE RIVER
11EPALES 2141304
0000 FEET DEPTH CLASS 00
DATE
FROM
TO
75/01/30
CP(T1-
75/01/30
75/02/27
CPCT>-
75/02/27
75/03/31
CP(T)-
75/03/31
75/04/30
CP(T»-
75/04/30
75/06/02
75/06/30
CP-
75/06/30
75/07/30
CP-
75/09/02
75/09/27
CP(T)-
75/09/27
75/09/30
CP-
75/09/30
75/10/30
CP(T>-
75/10/30
TIME DEPTH
OF
DAY FEET
09
21
09
15
09
20
09
20
12
09
22
09
20
09
22
09
22
00
24
09
\1
30
30
30
30
30
30
30
30
45
30
00
30
30
30
30
30
30
00
00
30
30
00630
N02&N03
N-TOTAL
MG/L
0.320
0.350
0.240
6.15F
0.400
0.150
0.100
0.050
0.350
0.100
00625
TOT KJEL
N
MG/L
34
32
26
* 37
26
213
30
40
.000
.000
.500
.bob
.000
.000
.000
.000
33.000
43
.000
00610 00671 00665
NH3-N PHOS-OIS PHOS-TOT
TOTAL ORTHO
M6/L MG/L P MG/L P
14.400
15.000
13.000
18.800
11.500
10.500
12.600
26.000
17.000
22.000
4.000
4.100
3.900
3.450
3.700
4.700
3.500
4.900
5.100
4.600
5.000
6.400
6.100
6.600
6.300
7.500
6.500
6.600
7.000
7.000
50051 50053
FLOW CONDUIT
RATE FLOW-MOD
INST MOD MONTHLY
5
5
6
..„__£
5
5
5
5
5
5
5
.160
.670
.110
.210
.650
.570
.450
.670
.670
.380
.310
5.530
5.390
5.600
S.250
5.530
5.240
5.350
5.300
5.310
5.360
5.460
-------
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 ^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.
-------
LAKE OATA TO Bt USFU IN i»A.K/KlMG<:
LAKE
CODE LAKE NAME
1601 AMFKicAt* FALLS
1602 CASCADE LAKE
1603 LAKE COEU=
1604 DWORSHAK
1605 HAUSE»
1606 HAVOEKi LAKE
1607 ISLAND PARK KESERVOIfJ
1608 LAKE LOWELL
1609 MAGIC RESERVOIR
1610 PALISADES RESERVOIR
1611 LOWFR PAYETT?
1612 LOWER TWIN LAKES
1613 UPPER TWIN LAKES
MEDIAN
TOTAL P
0.1 OS
0.032
0.017
O.nio
0.02S
0.010
0.034
0.070
0.062
0.024
0.013
0.016
0.017
MEDIAN
INORG N
0.080
0.060
0.040
0.080
0.075
0.040
0.050
0.070
0.130
o.oao
0.060
0.050
0.045
500-
MEAN SEC
*63.800
»15.0b7
390.348
401.666
366.286
243.500
391.778
477.111
400.750
345.426
234.000
370.000
369.143
MEAN
CHLOHA
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. BOO
12.200
7.400
14.800
11.800
12.HOO
14.600
14.700
12.800
9.600
13.600
8.200
MEDIAN
DISS ORTHO
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
-------
PERCENT OF LAKE"? *ITH HIGHER VALUtS (NUMBS* OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
1601 AMERICAN FALLS
1602 CASCADE LAKE
1603 LAKE COE'JP LMALENF
1604 DWORSHAK RESERVOIR
1605 HAL'SEx
1606 HAYDEN LAKE
1607 ISLAND PARK RESERVOIR
1608 LAKE LOWELL
1609 MA6IC RESERVOIR
1610 PALISADES RESERVOIR
1611 LOWER PAYETTE
1612 LOWER TWIN LAKES
1613. UPPER TWIN LAKES
MEDIAN
TOTAL P
0 (
33 I
67 (
96 (
4? (
96 (
25 (
8 (
17 (
50 (
83 (
75 (
58 (
0)
4)
3)
11)
5)
11)
3)
1)
2)
6)
10)
9)
7)
MEDIAN
INO&6 N
17 (
54 (
"ft t
17 (
33 (
96 (
71 (
42 (
0 (
17 (
54 (
71 (
83 (
1 )
6)
11)
1)
4)
11)
8)
5)
0)
1)
6)
8)
10)
500-
MEAN SEC
8 (
17 (
= 0 (
25 {
75 (
92 (
42 (
0 (
33 (
83. (
100 (
58 (
67 (
1)
2)
6)
3)
9)
11)
5)
0)
4)
10)
12)
7)
8)
HE AN
CHLOHA
8 {
42 t
25 (
83 (
17 (
75 (
33 (
0 (
50 <
100 {
67 (
92 (
58 (
1)
5)
3)
10)
2)
9)
4)
0)
6)
12)
8)
111
7)
15-
MIN DO
21
4
67 i
100 I
4 1
75 1
54 1
33 i
21 i
54 i
83 1
42 1
92 1
( 2)
( 0)
( 8)
! 12)
t 0)
t 9)
I 6)
! 4)
! 2)
I 6)
I 10)
I 5)
I 11)
MEDIAN
DISS ORTHO P
0
50
83
50
25
100
33
17
8
75
67
50
92
( 0)
1 i)
( 10)
( 5)
( 3)
( 12)
( 4)
( 2)
( 1)
( 9)
( 8)
( 5)
< 11)
------- |