-------
REPORT ON WILD HORSE RESERVOIR, NEVADA
STORE! NO. 3209
I. CONCLUSIONS
A. Trophic Condition;*
Survey data indicate that Wild Horse Reservoir is 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 the lake.
Chlorophyll a_ values in the lake ranged from 0.8 pg/1 in
November to 387.2 yg/1 in August with a mean of 75.5 pg/1.
Secchi disc visibility was low and the potential for primary
productivity as measured by algal assay control yields was high.
Marked depression of dissolved oxygen occurred in the hypolimnion
during the August sampling. Of the 10 Nevada lakes sampled in
1975, 4 had higher median total phosphorus values (0.114 mg/1),
2 had higher median inorganic nitrogen levels (0.320 mg/1), and
3 had higher median orthophosphorus values (0.065 mg/1) than
Wild Horse Reservoir.
*See Appendix E.
-------
B. Rate-Limiting Nutrient:
Algal assay results indicate that Wild Horse Reservoir was
limited by available nitrogen during the spring sampling (05/30/75)
and by available phosphorus during the fall (11/06/75). The reser-
voir data suggest primary limitation by nitrogen during the three
sampling dates.
C. Nutrient Controllability:
1. Point sources -
There were no known point sources impacting Wild Horse
Reservoir during the sampling year.
It should be noted that substantial nutrient impact to
the reservoir attributable to shoreline septic tanks may exist.
Those U.S. Geological Survey (USGS) quadrangles used for deter-
mining the number of shoreline residences! located within 100
meters of the lake were dated in the 1950's and 1960's.
Thus the present number of septic tanks in the area is not
known; neither has it been ascertained if those outside the
100 meter limit (U.S. EPA, 1975) do contribute nutrients to
the lake as has been suggested (F. Luchetti, Personal communi-
cation). The Nevada Department of Human Resources (1975)
reports the lack of adequate sanitary facilities serving
visitors to the lake may result in localized enrichment
problems. Additional study is recommended to obtain a more
-------
accurate picture of the nutrient budget for Wild Horse Reservoir.
2
The present phosphorus loading of 0.67 g P/m /yr is twice
that proposed by Vollenweider (1975) as "eutrophic" for a lake
of such volume and hydraulic retention time. Examination of
surrounding land use practices may provide answers to reduction
of nonpoint contributions to the lake.
2. Nonpoint sources -
The Owyhee River contributed 30.6% of the total phosphorus
load to Wild Horse Reservoir during the sampling year, Deep Creek
contributed 6.7%, and minor tributaries and immediate drainage
contributed 60.1%. The Nevada Department of Human Resources
(1975) lists agricultrual runoff as one of the main sources
of nonpoint enrichment in the Wild Horse Reservoir watershed.
The nutrient export rates of Owyhee River and Deep Creek
(Section IV-D) were substantially greater during the sampling
year than the inflowing tributary to nearby Wilson Reservoir*.
*See Working Paper No. 816, "Report on Wilson Reservoir".
-------
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake morphometry data were provided by James B. Williams, Jr. (per-
sonal communication). Tributary flow data were provided by the
Nevada District Office of the U.S. Geological Survey (USGS). Outlet
drainage area includes the lake surface area. Mean hydraulic reten-
tion time was obtained by dividing the lake volume by mean flow of
the outlet. Precipitation values are estimated by methods as out-
lined 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: 12.14 km .
2. Mean depth: 7.3 meters.
3. Maximum depth: 26.5 meters.
4. Volume: 88.811 x 106 m3.
5. Mean hydraulic retention time: 894 days (2.4 yrs).
-------
B. Tributary and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage Mean Flow
Name area (km2) (m3/sec)
A-2 Owyhee River 145.0 0.54
B-l Deep Creek 42.5 0.20
Minor tributaries and
immediate drainage - 342.7 0.47
Total 530.2 1.21
2. Outlet - A-l Owyhee River 541.3 1.15
C. Precipitation:
1. Year of sampling: 39.1 cm.
2. Mean annual: 37.4 cm.
-------
III. LAKE WATER QUALITY SUMMARY
Wild Horse 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 the last two visits, depth-
integrated samples for chlorophyll ^analysis were collected from
each station and on each sampling date samples for phytoplankton
identification and enumeration were taken. During the first and
last visits, 18.9-liter depth-integrated samples were composited for
algal assays. Maximum depths sampled were 11.3 meters at Station 01,
21.3 meters at Station 02, 19.8 meters at Station 03, 4.6 meters at
Station 04, and 7.6 meters at Station 05. For a more detailed ex-
planation 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.
-------
* I L"""^ _;t •^i^'-.-i-i • I •
STO=£T COOE
AND CHEMICAL CHA3ACTE* IST ICb
( ll/ 6/75 )
(OEG
DISSOLVED OXYGEN (•"-,,
o.-i.s M DEPTH
*AX DEPTH**
CONDUCTIVITY (U«HO«>
O.-l.S M DEPTH
MAX
PH (STANDARD UNITS)
o.-i.=; M DEPTH
MAX
TOTOL ALKALINITY c--f,/L)
0.-!.=. M DEPTH
'••AX
TOTAL P (MG/L)
o.-i.=i M DEPTH
MAX DEPTH««
DISSOLVED OHTHO P (MG/L)
o.-l.=: >* DEPTH
"AX
MO?*N03 (MG/L)
O.-l.1? M OEPTH
MAX
AMMONIA
O.-l.S M OEf-TH
MAX DEPTH9»
KJtLDAHL N
O.-l.^ M DEPTH
MAX DFPTH»«
•<»
7
)
6
4
7
c,
7
5
)
6
4
6
4
L)
6
4
f,
4
6
4
4
*AN
7.0-
?.«-
8.4-
8.3-
78.-
90.-
7.7-
0.-
0.108-0
0.100-0
0.02H-0
0.060-0
0.040-0
0.050-0
0.600-1
0.400-0
GF •.,;• ni fl..j
10.0 « . *•>
11 . S ll.»
10.4 •< . V
100. ion.
100. 10".
11.1 9.*
9.1 8.0
77. f>*.
Ml. 74.
.130 0.114
.20? 0.1'?
.06v 0.05t>
.067 0.050
.^40 O.l^O
. 2"0 0 . ?0b
.150 0 . 0 A 0
.100 0.075
.300 0.750
.800 O.^G
DEPT-
<^ET-
o.o-
4.3-
o.o-
4.3-
0.0-
4.3-
0.0-
4.3-
0.0-
4.3-
0.0-
4.3-
0.0-
4.3-
0.0-
4.3-
0.0-
4.3-
0.0-
4.3-
J
0.9
21.3
19. M
?U3
0.9
21 .3
0.9
19.8
0.9
19.8
0.9
19. *
0.9
19.*
0.9
19.8
0.9
19.8
N« -ANGE
c 20. S- 23.0
s = MO. OF SITES SAMPLED ON THI« PATE
-------
8
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
05/30/75
08/01/75
11/06/75
Algal
Dominant Units
Genera Per ml
1. Centric diatom 8,958
2. Fragilaria 444
3. Cryptomonas 121
4. Phormidium 121
5. Lyngbya 81
Other genera 80
Total 9,805
1. Gloeotrichia 541
2. Fragilaria 496
3. Aphanizpmenon 270
4. Aphanothece90
5. Cocconeis 90
Other genera 225
Total 1,712
1. Chroomonas? 196
2. Aphanizomenon 33
3. Trachelomonas 33
4. Schroederia 33
Other genera —
Total
295
-------
2. Chlorophyll a_ -
Sampling Station Chlorophyll a_
Date Number (yig/1)
08/01/75 01 10.0
02 20.3
03 13.6
04 309.7
05 387.2
11/06/75 01 0.8
02 3.5
03 3.5
04 2.5
05 4.2
-------
10
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked
Spike (mg/1)
a. 05/30/75
Control
0.05 P
0.05 P + 1.0 N
1.00 N
Ortho P
Cone, (mg/1)
0.045
0.095
0.095
0.045
Inorganic N
Cone, (mg/1)
0.135
0.135
1.135
1.135
b. 11/06/75 Stations 01-03
Control 0.060 0.390
0.05 P 0.110 0.390
0.05 P + 1.0 N 0.110 1.390
1.00 N 0.060 1.390
Stations 04-05
Control 0.075 0.520
0.05 P 0.125 0.520
0.05 P + 1.0 N 0.125 1.520
1.00 N 0.075 1.520
Maximum Yield
(mg/1-dry wt.)
7.7
8.4
34.9
19.9
8.4
10.9
9.7
7.4
15.4
18.6
16.7
12.3
-------
11
2. Discussion -
The control yields of the assay alga, Selenastrum capri-
cornutum*, indicate that the potential for primary productivity in
Wild Horse Reservoir was high at both sample collection times
(05/30/75, 11/06/75). In the May assay, a significant increase in
yield over that of the control occurred when nitrogen was added
alone and in combination with phosphorus, indicating nitrogen
limitation. Spikes of phosphorus alone resulted in a yield which
was not significantly greater than that of the control. In the
November assays, the slight increases in growth over control yields
produced by the addition of phosphorus suggest phosphorus limitation.
The mean inorganic nitrogen to orthophosphorus ratios (N/P)
in the lake data of less than 7/1 on all three sampling occasions
suggest primary limitation by nitrogen (a mean N/P ratio of 14/1
or greater generally reflects phosphorus limitation).
*For further information regarding the algal assay test procedure
and selection of test organisms, see U.S. EPA (1971).
-------
12
IV. NUTRIENT LOADINGS
(See Appendix D for data)
For the determination of nutrient loadings, the Nevada 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 months of April, May and June when two samples were collected.
Sampling was begun in November 1974, and was completed in October
1975.
Through an interagency agreement, stream flow estimates for the
year of sampling and a "normalized" or average year were provided by
the Nevada 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 Owyhee River and Deep Creek at
2
Stations A-2 and B-2 and multiplying the means by the II area in km .
-------
13
A. Waste Sources;
1. Known municipal - None
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
I of
Source kg P/yr total
a. Tributaries (nonpoint load) -
A-2 Owyhee River 2,445 30.6
B-l Deep Creek 530 6.7
b. Minor tributaries and immediate
drainage (nonpoint load) - 4,800 60.1
c. Known municipal STP's - None
d. Septic tanks - None known
e. Known industrial - None
f. Direct precipitation* - 210 2.6
Total 7,985 100.0%
2. Outlets - A-l Owyhee River 10,415
3. Net annual P export** - 2,430
*Estimated (See NES Working Paper No. 175).
*Export probably due to unknown sources and/or sampling error.
-------
14
C. .Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kgN/yr total
a. Tributaries (nonpoint load) -
A-2 Owyhee River 37,190 27.9
B-l Deep Creek 7,775 5,8
b. Minor tributaries and immediate
drainage (nonpoint load) - 75,395 56.5
c. Known municipal STP's - None
d. Septic tanks - None known
e. Known industrial - None
f. Direct precipitation* - 13.105 9.8
Total 133,465 100.0%
2. Outputs - A-2 Owyhee River 61,640
3. Net annual N accumulation - 71,825
*Estimated (See NES Working Paper No. 175),
-------
15
D. Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
7 2
Tributary kg P/km /yr kg N/km /yr
Owyhee River 17 256
Deep Creek 12 183
E. Mean Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total N
Tributary (mq/1) (mg/1)
C-l Penrod Creek 0.087 1.000
-------
16
F. Yearly Loadings:
In the following table, the existing phosphorus annual 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 apply to lakes with short
hydraulic retention times or in which light penetration is severely
restricted by high concentrations of suspended solids in the surface
waters.
Total Yearly
Phosphorus Loading
(g/m^/yr)
Estimated loading for Wild Horse Reservoir 0.66
Vollenweider's "eutrophic" loading 0.34
Vollenweider's "oligotrophic" loading 0.17
-------
17
V. LITERATURE REVIEWED
Luchetti, F. 1977. Personal communication (septic tanks). Nevada
Environmental Protection Service, Carson City, Nevada.
Nevada Department of Human Resources. 1975. Water Quality Manage-
ment Plan for the Nevada Portion of the Snake River Basin, Carson
City, Nevada.
U.S. Environmental Protection Agency. 1971. Algal Assay Procedure
Bottle Test. National Eutrophication Research Program, Corvallis,
Oregon.
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.
Williams, James B. 1974. Personal communication (lake morphometry),
Department of Human Resources, Carson City, Nevada,
-------
18
VI. APPENDICES
APPENDIX A
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
-4
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 03837 = inches
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 - Ibs/square mile
-------
APPENDIX B
TRIBUTARY FLOW DATA
-------
FLQB INFORMATION FOR NEVADA
1/21/77
LAKt CODE 3209 BlLD HORSE RESERv/OI*
TOTAL DRAINAGE A^EA OF LAKtCSQ KM) 5*1.J
SUB-DRAINAGE
TRIBUTARY AREAISQ KM)
JAN
APR
MAY
NORMALIZED FLOHS(CMS)
JUN JUL AUG
SEP
OCT
NOV
DEC
3209A1
3209A2
320991
3209ZZ
541.3
145.0
42o5
356.3
0.057
0.355
0.085
0.2?7
0.227
0.255
0.085
0.227
0.311
1.453
0.170
0.396
2.039
1.161
0.425
0.991
2.577
1.869
0.680
1.614
2.265
1.529
0.566
1.303
2.322
0.425
0.142
0.368
2.322 1.274
0.113 O.OBb
0.057 0.028
0.113 0.085
0.255
0.113
0.042
0.113
0.057
0.113
0.042
0.113
0.028
0.142
0.057
0.113
1
0
0
0
SUMMARY
TOTAL
SUM OF
DRAINAGE
AREA OF
LAKE =
SUB-DRAINAGE AREAS =
541.3
54?. 3
TOTAL FLOW IN =
TOTAL FLOH OUT =
14
13
.55
.73
MEAN MONTHLY FLOdS AND DAILY FLO*S
TRIBUTARY
3209A1
MONTH YEAR
MEAN FLOW OAV
FLOW DAY
FLOW DAY
FLOW
3209A?
11
12
1
?
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
a
9
10
74
74
75
75
75
75
75
75
75
75
75
75
74
74
75
75
75
75
75
75
75
75
75
75
0.210
0.028
0.023
0.020
0.025
1.472
10.591
5.720
1.189
2.095
1.388
2.124
0.057
0.051
0.051
0.071
0.113
0.255
0.850
0.198
0.085
0.028
0.031
0.034
?4
11
IB
?.?
??
13
1?
7
2n
17
13
12
24
13
18
2?
??
13
1?
7
20
17
13
1?
0.201
0.028
0.023
0.020
0.028
0.680 28
2.577 24
8.495 22
0.122
2.379
1.671
1.529
0.057
0.042
0.051
n.068
0.127
0.255 28
0.991 24
0.283 22
0.062
0.023
0.031
0.034
2.407
15.914
4.276
0.566
0.850
0.113
-------
LAKE COOt 3209
TRIBUTakY FLOW INFORMATION FOR NEVADA
*ILD HOUSE RESERVOIR
1/21/77
MEAN MONTHLY FLO«S AND DAILY FLO*S(CMS)
TRIBUTARY MONTH YtAw MEAN FLO* DAY
3209B1
11
12
1
2
3
4
5
6
7
8
9
10
74
74
75
75
75
75
75
75
75
75
75
75
0.0
0.011
0.028
0.042
0.085
0.283
1.982
0.991
0.113
0.003
0.0
0.0
24
n
18
2?
2?
n
1?
7
20
17
13
9
FLO« DAY
n.o
0.003
0.037
0.0*0
n.142
0.255
2.265
1.557
0.085
0.003
0.0
0.0
FLO* DAY
FLOW
28
24
22
0.566
2.124
0.708
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STORET RETRIEVAL OftTE 77/01/26
NATL EUTrtOPHICATION SURVEY
EPA-LAS VEGAS
320901
41 41 02,0 115 48 16.0 3
«!!_QHORS£ RESERVOIR
32007 NEVADA
/TYPA/AMBNT/LAKE
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/05/30 10 00 0000
10 00 0003
10 00 0006
10 00 0010
10 00 0016
10 00 0023
10 00 0035
75/08/01 16 07 0000
16 07 0009
16 07 0024
16 07 0037
75/11/06 13 35 0000
13 35 0005
13 35 0015
13 35 0030
11EPALES 751216 04001002
0035 FEET DEPTH CLASS 00
OOC10
WATER
TEMP
CENT
8.0
7.0
6.5
6.0
6.0
5.5
5.0
23.0
18.0
15.8
11.0
5.8
5.8
5.8
5.7
00300
DO
MG/L
3.8
8.4
10.2
7.2
9.3
11.0
11.6
5.4
0.8
7.2
7.4
7.0
7.0
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICBOMHO
17 78
83
85
86
86
92
90
6 13
12
12
11
177
180
181
179
00400
PH
su
9.80
9.00
8.80
8.60
7.80
8.00
7.70
8.70
8.65
8.00
7.75
7.50
7.55
7.50
7.55
00410
T ALK
CAC03
MG/L
57
60
65
63
72
79
77
79
72
75
75
74
75
00610
NH3-N
TOTAL
MG/L
0.090
0.070
0.080
0.100
0.090
0.060
0.050
0.120
0.120
0.250
0.260
0.240
0.260
00625
TOT KJEL
N
MG/L
1.300
0.600
0.600
0.600
0.600
2.400
1.300
1.100
0.800
0.700
0.800
0.700
0.800
00630
N024.N03
N-TOTAL
MS/L
o.iao
o.?oo
O.?10
O.?40
O.?50
0.030
0.020
0.170
0.180
0.230
O.?40
0.240
0.240
00671
PHOS-DIS
OWTHO
MG/L P
0.069
0.054
0.054
0.058
0.058
0.076
0.018
0.124
0.117
0.069
0.070
0.068
0.078
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
75/05/30 10 00 0000 0.130
10 00 0003 0.108
10 00 0006 0.114
10 00 0016 0.117
10 00 0035 0.120
75/08/01 16 07 0000 0.332 10.0
16 07 0009 0.201
16 07 0024 0.282
16 07 0037 0.228
75/11/06 13 35 0000 0.109 0.8
13 35 0005 0.115
13 35 0015 0.115
13 35 0030 0.114
00031
IMCDT LT
REMNING
PERCENT
-------
STCRET RETRIEVAL DATE 77/01/26
NATL EJTROPHICATION SURVEY
EPA-LAS tfEGAS
320902
61 41 12.0 115 50 23.0 3
wILDHORSE RESEHVOI3
32007 NEVADA
/TYPA/AMBWT/LAKE
11EPALES 751216 04001002
0070 FEET DEPTH CLASS oo
DATE
FROM
TO
75/05/30
75/08/01
75/11/06
00010
TIME DEPTH WATER
OF TEMP
DAY FEET
11
11
11
11
11
11
11
15
15
15
15
15
14
14
14
14
14
00
00
00
00
00
00
00
07
07
07
07
07
15
15
15
15
15
0000
0006
0010
0016
0033
0050
0070
0000
0012
0027
0040
0063
0000
0005
0015
0035
0062
CENT
8.0
7.0
6.0
5.4
4.8
3.9
2.8
21.0
18.3
16.3
10.0
7.8
5.9
5.9
5.8
5.5
5.4
00300
DO
MG/L
11.5
7.9
9.6
9.1
4.0
6.2
6.0
2.6
0.4
1.0
7.2
6.8
6.6
6.6
6.6
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
15 100
100
100
100
100
100
100
6 12
12
12
10
10
177
180
161
180
181
00400
PH
SU
8.60
8.60
8.40
7.40
8.20
8.20
8.00
8.30
8.40
7.80
7.50
7.40
7.60
7.60
7.55
7.50
7.50
00410
T ALK
CAC03
M6/L
OR
63
66
74
76
80
77
76
77
78
76
80
82
81
85
00610
NH3-N
TOTAL
MG/L
0.150
0.060
0.070
0.080
0.120
0.060
0.050
0.050
0.180
0.280
0.220
0.240
0.240
0.220
0.230
00625
TOT KJEL
N
MG/L
0.600
0.600
0.500
0.600
0.800
1.000
0.700
0.600
0.700
1.000
0.700
0.700
0.700
0.700
0.800
00630
N02S.N03
N-TOTAL
MG/L
O.?40
O.?30
0.240
0.240
O.?50
0.040
0.040
0.170
O.?10
0.160
0.220
0.220
0.230
O.?40
0.740
00671
PHOS-DIS
09THO
MG/L P
0.057
0.054
0.055
0.054
0.043
0.036
0,033
0.064
0.134
0.114
0.069
0.069
0.067
0.066
0.067
DATE
FROM
TO
75/05/30
75/08/01
75/11/06
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF A REMNING
DAY FEET
11
11
11
11
11
15
15
15
15
15
14
14
14
14
14
00 0000
00 0006
00 0010
00 0016
00 0050
07 0000
07 0012
07 0027
07 0040
07 0063
15 0000
15 0005
15 0015
15 0035
15 0062
MG/L P
0.116
0.113
0.116
0.144
0.235
0.097
0.061 .
0.094
0.196
0.253
0.108
0.108
0.104
0.118
o.i as
UG/L PERCENT
20.3
3.5
-------
STORET RETRIEVAL DATE 77/01/36
*JATL EUTROPhlCATIOW SURVtY
EPA-LAS VEGAS
320903
41 40 48.0 115 49 03.0
WILDHCMSE RESEKVOIR
32007 NEVADA
/TYPA/AM6NT/LAKE
11EPALES 751216 04001002
0065 FEET DEPTH CLASS 00
DATE
FROM
TO
75/05/30
75/08/01
75/11/06
TIME DEPTH
OF
DAY FEET
12 00
12 00
12 00
12 00
12 00
12 00
12 00
15 40
15 40
15 40
15 40
15 40
14 00
14 00
14 00
14 00
0000
0006
0010
0016
0033
0045
0065
0000
0012
0024
0040
0060
0000
0005
0015
0050
00010
HATER
TEMP
CENT
8.5
7.9
6.5
5.4
4.8
4.0
3.5
20.5
17.8
15.4
10.5
7.5
5.8
5.8
5.8
5.4
00300
DO
MG/L
11.5
9.2
12.8
9.5
9.fl
8.6
8.0
6.2
2.0
1.8
1.0
7.4
7.4
7.0
7.0
00077 00094
TRANSP CNOUCTVY
SECCHI FIELD
INCHES MICPOMHO
15 100
100
100
96
94
94
94
6 13
11
12
10
11
177
174
180
178
00400
PH
su
9.09
8.20
7.90
8.40
8.40
8.30
7.70
8.85
8.65
8.00
7.60
7.95
7.60
7.90
7.60
7.60
00410
T ALK
CAC03
MG/L
70
74
73
75
80
81
79
80
77
75
82
80
74
75
72
00610
NH3-N
TOTAL
MG/L
0.050
0.050
0.050
0.050
0.110
0.100
0.040
0.060
0.060
0.120
0.260
0.2?0
0.220
0.210
0.220
00625
TOT KJEL
N
MG/L
0.900
0.600
0.500
0.700
0.600
0.700
0.800
O.BOO
0.700
0.700
0.900
0.700
0.700
0.700
0.700
006.10
N02&N03
N-TOTAL
MG/L
0.160
0.190
0.210
O.?10
O.?70
0.280
0.030
0.030
0.190
O.?60
0.150
0.220
0.210
O.?10
0.240
00671
PHOS-DIS
ORTHO
MR/L P
0.058
0.050
0.057
0.056
0.066
0.067
0.022
0.020
0.072
0.069
0.155
0.068
0.068
0.067
0.066
DATE
FROM
TO
75/05/30
75/08/01
75/11/06
TIME
OF
DAY
12 00
12 00
12 00
12 00
12 00
12 00
15 40
15 40
15 40
15 40
15 40
14 00
14 00
14 00
14 00
DEPTH
FEET
0000
0006
0010
0016
0033
0065
0000
0012
0024
0040
0060
0000
0005
0015
0050
00665
PHOS-TOT
MG/L P
0.127
0.113
0.113
0.116
0.127
0.125
0.069
0.051
0.114
0.141
0.284
0.110
0.108
0.111
0.105
32217 00031
CHLRPHYL INCOT LT
A REMNING
UG/L PERCENT
13.6
3.5
-------
STORET RETRIEVAL DATE 77/01/26
NATL EUTROPHlCATION SURVEY
EPA-LAS VEGAS
320904
41 39 23.0 115 47 41.0 3
WILOHORSE RESEHVOIR
32007 NEVADA
/TYPA/AMbNT/LAKE
DATE
FROM
TO
75/05/30
75/08/01
75/11/06
TIME DEPTH
OF
DAY FEET
13 00 0000
13 00 0006
13 00 0010
13 00 0014
13 42 0000
13 42 0006
13 00 0000
13 00 0005
13 00 0015
00010
*ATER
TEMP
CENT
10.0
9.9
9.9
8.5
22.5
16.5
5.3
5.4
5.4
00300 00077
DO TRANSP CN
«:ECCHI FIELD
MG/L INCHES MI
11.4
9.4
10.4
10.6
8.2
8.8
7.2
7.6
14
lltPALES 751216 04001002
0014 FEET DEPTH CLASS 00
94
TVY
MHO
100
100
100
100
13
12
179
177
179
00400
PH
SU
11.09
10.89
10.40
9.00
9.10
9.30
7.20
7.35
7.40
00410
T ALK
CAC03
MG/L
77
76
70
76
79
73
74
77
00610
NH3-N
TOTAL
MG/L
0.050
0.040
0.050
0.100
0.040
0.200
0.200
0.220
00625
TOT KJEL
M
MG/L
0.800
0.700
0.400
2.600
0.800
0.700
0.800
0.800
00630
N02&N03
N-TOTAL
MG/L
0.060
0.060
0.060
0.020K
0.020K
O.?20
0.230
0.230
00671
PHOS-DIS
ORTMO
MG/L P
0.035
0.031
0.028
0.060
0.021
0.065
0.069
0.070
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
75/05/30 13 00 0000 0.112
13 00 0006 0.106
13 00 0014 0.100
75/08/01 13 42 0000 0.357 309.7
13 42 0006 0.068
75/11/06 13 00 0000 0.112 2.5
13 00 0005 0.113
13 00 0015 0.113
00031
IMCDT LT
REMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 77/01/36
NATL EUTROPHICATION SUHVEY
EPA-LAS VEGAS
320905
41 40 14.0 115 47 18.0 3
WILOHORSE RESERVOIR
33007 NEVADA
/TYPA/AM8NT/LAKE
11EPALES 751216 04001002
0031 FEET DEPTH CLASS
DATE
FWOM
TO
75/05/30
75/08/01
75/11/06
DATE
FROM
TO
75/05/30
*75/08/01
75/11/06
TIME DEPTH
OF
DAY FEET
14 00 0000
14 00 0003
14 00 0006
14 00 0010
14 00 0016
14 00 0025
14 20 0000
14 20 0009
14 20 0015
13 20 0000
13 20 0005
13 20 0015
TIME DEPTH
OF
DAY FEET
14 00 0000
14 00 0006
14 00 0016
14 00 0025
14 20 0000
14 20 0009
14 20 0015
13 20 0000
13 20 0005
13 20 0015
00010
MATER
TEMP
CENT
9.7
9.7
9.7
9.4
7.0
6.0
22.4
18.7
16.5
6.0
6.0
6.0
00665
PHOS-TOT
*
MG/L P
0.111
0.105
0.129
0.202
0.514
0.068
0.104
0.137
0.132
0.134
00300
DO
MG/L
11.4
11.3
8.4
8.3
10.6
7.0
6.0
7.2
7.2
7.0
32217
CHLRPHYL
A
UG/L
387.2
4.2
00077 00094
TRANSP CNDUCTVY
sECCHI FIELD
INCHES MICROMHO
15 100
100
100
100
100
100
6 13
12
12
184
184
184
00031
INCDT LT
PFMNING
PERCENT
00400
PH
su
9
9
9
8
8
9
8
8
8
7
7
7
.40
.40
.30
.90
.80
.10
.70
.75
.40
.50
.50
.50
00410
T ALK
CAC03
MG/L
76
76
82
76
76
80
78
79
80
81
00610
NH3-N
TOTAL
MG/L
0.040
0.040
0.050
0.060
0.070
0.040
0.740
0.220
0.290
0.230
00
00625
TOT KJEL
N
MG/L
0.700
0.500
0.600
0.800
3.200
0.800
0.900
0.800
0.800
0.800
00610
N02&N03
N-TOTAL
MG/L
0.080
0.070
0.140
0.160
0.020K
0.020K
O.?30
0.300
O.?30
0.220
00671
PHOS-DIS
ORTHO
MG/L P
0.035
0.034
0.042
0.042
0.224
0.024
0.028
0.080
0.082
0.082
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
/ T v P 4 / i. >• K 1.1 T / <; T '-> '•: 4 • i
3;: iJ <- A c
41 3" 40.(i 115 4? 30.n it
OUYMfe'E •iiVf.rt
32 IS *ILO HO*SE,
T/-ILU MjKSt StSCHVOl1* 13j.}3 TOT KjEL
VG/L
,,
}
n
'i
o
ij
0
0
0
i)
0
0
(j
0
11
.01'-
.•'J?4
.084
.IPS
.07^
.010
.115
.01-;
.Oln
. 0 9 n
. 045
. •) 1 u
.01^
.020
.015
MG/L
1 .
1.
0.
0.
0.
^.
2.
1.
1.
0.
1.
1.
0.
1.
0.
100
600
700
500
950
800
300
H50
500
45(1
750
250
350
500
500
OOMO
Mr-3— M (
TOTAL
MG/L
n.
0.
0.
0.
0.
0.
0.
o.
0.
0.
0.
0.
0.
0.
0.
035
060
032
030
070
045
170
040
0*0
U30
155
045
020
030
025
00671 00^-65
•"nOS-UlS DHOs-TOT
O^THO
MG/L
0.
0.
0.
0.
0.
0.
• n.
0.
0.
0.
0.
0.
0.
0.
0.
>-
070
070
075
U85
115
04-0
135
140
105
045
050
155
080
140
095
vr,/L p
0.070
0.130
0.110
0.140
0.14Q
0.340
0.210
0.200
0.160
O.ObU
0.160
0.1 90
0.110
0.2*0
0.0«0
-------
.,'•!!/ i / •>*
, i IH >/t r
41 41 15.0 115 bo 40." 4
J2 IS WILD
0/-II.O HO^SE HtStirivOI* Ii074«?
HNtv SAM 10(1 FT MM ri*V A3 N« TIC Dt-
lltPALFS 0^001004
0000 KEKT UF^TH CLASS 00
PFS
1 ..'
74/lf/l >
75//'"|^/(?'i
T^/'m/i?
/S/0*3/^4
7t>/06/07
7^/06/22
7^/07/20
7^/08/17
7t>/'i9/l "•)
7^/10/12
[ !'••£. jt*> r -
Ih
i'4< Ff-tr
1? ?o
12
1?
1 1
1 1
IS
15
15
15
12
11
11
11
12
45
00
01
40
0°
0')
00
00
nn
O'"1
00
35
0*
N-Tf.
VI (.
0
1)
0
0
0
0
u
(1
0
0
0
u
0
0
1)
N03 TOT KJtL
TAL N
/L MR/L
. 0«? 1.3SO
. 0 P 0 1.5QO
.0?4 2.?50
.005 4.300
.005 4 .600
.03=. 3.4bO
.270 1.500
.3"0
.220
.0?0
.080
.200
.070
.550
.f30
.0/5
.^00
. v5o
.luo
.020 O.Q09
.090 1.800
00*^10 OOiS 71
Nr'3-^ MHUb-l'IS f
TOT IL OWTMO
MG/L wfi/L H
0.174 0.0t«7
0.
0.
2
2
1
0
0
0
0
0
0
0
0
0
m
h50
000
40j
05(1
400
no
. i KO
, i 3b
1?0
, l*>0
,110
.240
,140
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
045
1H7
IS")
ItlO
155
136
110
080
14S
0^5
165
130
165
070
00
MR/
0
0
0
1
2
0
0
0
0
0
0
0
0
0
0
L r
.OBO
.630
.350
.700
.^20
.2flO
.230
.130
.175
.100
.?! 0
. IHO
.220
.110
-------
r^j- ,_ A - i/>:C-6S
• JiTt
IT
Ot-T-.
Of
lf> Ot>
7c-/(i6X07
16 30
09 SP
7SXOHX17 10 1^
n . 71
MGXL (-
0.040
0.080
0.060
0.040
0.0^5
41 37 O5.n
.,5.0 4
TXxIL'J HO'-JSE
BKn s.s MI b« OF \
04001004
utHTh CLASS 00
"(-OS-TOT
O.OhO
0.100
0.130
O.OSO
-------
t-~ < . ' .,- - 1
• - a - ,_ t '. v t J £ -
r-»i i
jf 0-»C 1
41 40 50.0 lib 4h 50.0 4
3x 15 "ILU -")*SE
T/wlLD Hf)t*SE RfcSt*VOI*
HPUG CM DwT hiO 3.3 «I NE
llEPfiLES 04001004
fiOOO FEET LieHTH CLftSS 00
F ** •' ( •*
T'l
7»/i 1/24
7ft/l 2/13
75/" j/2^
75/il4/l3
75/r>4/2ft
75/ J5/12
75/ri5/24
7H/06/07
7^/06/2?
7b/i!7/3<)
75/r>8/17
75/0-J/13
7^/1 0/12
ot-
1 1
11
11
15
15
15
15
Ir1
10
10
10
11
2-,
50
00
45
15
15
15
0"
20
4^.
55
17
hi;
1:
0
•J
0
0
0
0
0
n
0
0
0
0
f>J."j 00^25
N01 TOT KJtL
T &1_ N
/L MG/L
.00*
.030
.045
.015
.250
.130
.025
.030
.030
.010
.005
.020
.00^
1.
1.
0.
0.
0.
1.
1.
0.
1.
0.
0.
0.
1.
100
400
300
«50
900
750
-------
APPENDIX E
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1975
STATE OF NEVADA
Mean or median values for six of the key parameters evaluated
in establishing the trophic conditions of Nevada 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 pg/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 DATV FO SE USED IN RANKINGS
LAKE
CODE LAKE NAME
3201 LAKE ?:EAD
3202 LAKOflTA.N RESERVOIR
3204 RYE PATCH RESERVOIR
3205 LAKE T^HOE
3206 TOPAZ RESERVOIR
3207 UPPER PAHRANGAT LAKE
3203 WASHOE LAKE
3209 WILD H3"SE RESERVOIR
3210 WILSON RESERVOIR
3211 WALKER LAKE
MEDIAN
TOTAL P
0.016
0.19S
0.094
0.005
0.057
0.173
0.403
0.114
.0.049
0.602
MEDIAN
li-JORG N
0.340
0.350
0.050
0.040
0.165
0.125
0.130
0.320
0.120
0.030
500-
MEPN SEC
266.565
472.033
467.750
-3.269
376.000
470.000
494.555
439.400
197.333
405.333
MEAN
CHLORA
3.111
4.508
4.933
0.571
7.517
—
11.633
75.530
10.033
3.422
15-
KIN DO
11.400
10.400
10.000
10.200
14.600
3.600
7.200
14.600
11.400
15.000
;:EDIA;<
DISS ORTHO P
0.005
0.143
O.C39
0.003
0.041
0.026
0.263
0.065
0.016
0.574
-------
PEP.CE:II OF LAXES UITH HIGHER VALUES ;::u:3ER OF LAKES ;;ITK HIGHER VALUES)
LAKE
CCDE LAKE NAME
3201 LAKE HEAD
3202 LAHOriTAN RESERVOIR
3204 RYE PATCH RESERVOIR
3205 LAKE TAKOE
3206 TOPAZ RESERVOIR
3207 UPPER PAHRANAGAT LAKE
3203 WASHOE LAKE
3209 WILD HORSE RESERVOIR
3210 WILSON RESERVOIR
3211 ' WALKER LAKE
i'.EDlA
TOTAL
89 (
22 (
56 (
100 (
67 (
23 (
11 (
44 (
73 (
0 (
N
P
£)
2)
5)
9)
6)
3)
1)
4)
7)
0)
MED I AM
INORG i
11 (
0 (
89 (
100 (
33 (
56 (
44 (
22 (
67 (
78 (
^
1)
0)
8)
9)
3)
5)
4)
2)
6)
7)
500-
riEAr: SEC
73 (
22 t
44 (
ICO (
67 (
33 (
0 (
11 (
89 (
56 (
7)
2)
4)
9)
6)
3)
0)
1)
8)
5)
::EAN
CHLORA
88 (
63 C
50 (
100 (
33 (
13 (
0 ('
25 (
75 (
7)
5)
4)
8)
3)
1)
0)
2)
5)
15-
MIN DO
39 (
56 (
78 (
67 (
17 (
89 (
100 (
17 (
39 (
0 (
3)
5)
7)
6)
1)
3)
9)
1)
3)
0)
DISS GR
89 (
22 (
55 (
100 (
44 (
67 (
11 (
33 (
78 (
0 C
r".i \
THO P
8)
2)
5)
9)
4)
5)
1)
3)
7)
0)
-------