U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
C, W, McCONAUGHY RESERVOIR
KEITH COIKIY
NEBRASKA
EPA REGION VII
WORKING PAPER No, 559
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
irc.r.o. 699-440
-------
REPORT
ON
C, W, ItCONAUGHY RESERVOIR
KEITH COUNTY
NEBRASKA
EPA REGION VII
WORKING PAPER No, 559
WITH THE COOPERATION OF THE
NEBRASKA DEPARTMENT OF ENVIRONMENTAL CONTROL
AND THE
NEBRASKA NATIONAL GUARD
AUGUST, 1976
-------
1
CONTENTS
Page
Foreword ii
List of Nebraska Study Reservoirs iv
Lake and Drainage Area Map V
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Sumary 4
IV. Nutrient Loadings 8
V. Literature Reviewed 12
VI. Appendices 13
-------
11
FOREWORD
The National Eutrophication Survey was initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concentrations,
and impact on selected freshwater lakes as a basis for formulating
comprehensive and coordinated national, regional, and state management
practices relating to point-source discharge reduction and non-point
source pollution abatement in lake watersheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey’s eutrophication analysis are based on related concepts that:
a. A generalized representation or model relating
sources, concentrations, and impacts can be constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized model
can be transformed into an operational representation of
a lake, its drainage basin, and related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and water-
shed data collected from the study lake and its drainage basin is
documented. The report is formatted to provide state environmental
agencies with specific information for basin planning [ g303(e)], water
quality criteria/standards review [ 3O3(c)], clean lakes { 3l4(a,b)],
and water quality monitoring [ lO6 and §305(b)] activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.
-------
ill
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation’s
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 EPA
and to augment plans implementation by the states.
AC KNOWL EDGMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Nebraska Department of
Environmental Control for professional involvement, to the
Nebraska National Guard for conducting the tributary sampling
phase of the Survey, and to those wastewater treatment plant
operators who voluntarily provided effluent samples and flow
data.
The staff of the Water Pollution Control Division, Department
of Environmental Control, provided invaluable lake documentation
and counsel during the Survey, reviewed the preliminary reports,
and provided critiques most useful in the preparation of this Working
Paper series.
Major General Francis L. Winner, the Adjutant General of Nebraska,
and Project Officer Colonel Burl M. Johnson, who directed the volun-
teer efforts of the Nebraska National Guardsmen, are also gratefully
acknowledged for their assistance to the Survey.
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iv
NATIONAL EUTROPHICATION SURVEY
STATE OF NEBRASKA
RESERVOIR NAME COUNTY
Branched Oak Lancaster
Harlan County Harlan
Harry D. Strunk Frontier
Hugh Butler Frontier, Red Willow
Johnson Dawson, Gosper
McConaughy Keith
Pawnee Lancaster
Sherman Sherman
Swanson Hitchcock
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SAND HILLS
>j \
Kow .\ ,rf
. .
SAND HILLS
103•00 ’
10240’
C. W. Mc CONAUGHY RESERVOIR
x
Tributary Sampling Site
Lake Sampling Site
Sewage Treata nt Facility
0
10
0
20
10
Scale
‘°Kjn.
20M 1.
Map Location
Platte
bgdjcik, • River
NEBRASKA
-------
C. W. McCONAUGHY RESERVOIR
STORET NO. 3106
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that McConaughy Reservoir is rneso-eutro-
phic. It ranked first in overall trophic quality when the nine
Nebraska reservoirs sampled in 1974 were compared using a com-
bination of six lake parameters*. None of the other reservoirs
had less median total phosphorus or median dissolved orthophos-
phorus, eight had less median inorganic nitrogen, one had less
mean chlorophyll a, and none had greater mean Secchi disc trans-
parency. Depression of dissolved oxygen with depth (to 39% of
saturation) occurred at sampling station 1 in July.
Survey limnologists did not observe any macrophytes or sur-
face concentrations of algae during sampling visits.
B. Rate-Limiting Nutrient:
The algal assay results indicate that McConaughy Reservoir
was phosphorus limited at the time the samples were collected
(04/16/74 and 09/27/74). The reservoir data also indicate phos-
phorus limitation on those dates.
C. Nutrient Controllability:
1. Point sources--It is estimated that known point sources
within 40 km of McConaughy Reservoir contributed less than 1%
* See Appendix A.
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2
of the total phosphorus load to the reservoir during the
sampling year. The major contributor was the Oshkosh waste-
water treatment plant (0.6%).
The present phosphorus loading of 1.36 g/m 2 /yr is more than
twice that proposed by Vollenweider (Vollenweider and Dillon, 1974)
as a eutrophic loading (see page 11), and it is unlikely that
control of phosphorus at the nearby point sources would result
in any appreciable improvement in the trophic condition of the
reservoir. However, several wastewater treatment plants discharge
to the North Platte River over 40 km upstream, and phosphorus
removal at these facilities, in addition to those considered in
this report, probably would result in some improvement in the
trophic condition of the reservoir.
2. Non-point sources--Non-point sources (including point
sources over 40 km upstream) are estimated to have contributed
over 99% of the total phosphorus loading during the sampling
year. The North Platte River contributed 90.0%, Clear Creek
contributed 0.5%, and ungaged tributaries contributed an esti-
mated 7.5%.
-------
Name ____________ __________
North Platte River
Clear Creek
Minor tributaries &
immediate drainage - ________ _____
Totals
2. Outlet -
North Platte River
C. PrecipitatiOfl***
1. Year of sampling: 47.1 centimeters.
2. Mean annual: 45.8 centimeters.
t Table of metric conversions--Appendix B.
tt Hartung, 1974.
* For limits of accuracy, see Working Paper No. 175, ‘.. .Survey Methods,
1 973-1976’.
** Includes area of reservoir.
*** See Working Paper No. 175.
3
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphonletrytt:
1. Surface area: 141.64 kilometers 2 .
2. Mean depth: 19.8 meters.
3. Maximum depth: 43.3 meters.
4. Volume: 2804.472 x 106 m 3 .
5. Mean hydraulic retention time: 2.4 years (based on outflow).
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage
area (km 2 )*
65,785.9
51.8
842.6
66,680.3
Mean flow
( jn 3 /sec *
40.17
0.22
4.69
45.08
66,821.9** 37.26
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4
III. LAKE WATER QUALITY SUMMARY
McConaughy Reservoir was sampled three times during the open-
water season of 1974 by means of a pontoon-equipped Huey helicopter.
Each time, samples for physical and chemical parameters were collected
from two or more depths at three stations on the reservoir (see
map, page v). During each visit, a single depth-integrated (4.6
in or near bottom to surface) sample was composited from the stations
for phytoplankton identification and enumeration; and during the
first and last visits, a single 18.9-liter depth-integrated sample
was composited for algal assays. Also each time, a depth-integrated
sample was collected from each of the stations for chlorophyll
a analysis. The maximum depths sampled were 33.5 meters at station
1, 20.7 meters at station 2, and 6.7 meters at station 3.
The sampling results are presented in full in Appendix D and
are summarized in the following table (the July nutrient samples
were not properly preserved and were not analyzed).
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A. SUMI.’ARY OF PHYSICAL AND CHEMICAL CHARACTERISTICS FOR LAIcE MCCONAUG (IY
STORET CODE 3106
1ST SAMPLING ( 4/16/74) 2ND SAMPLING ( 7/ 1/74)
3 SITES 3 SITES 3 SITES
3RD SAMPLING ( 9/27/74)
PARAMETER
RANGE
MEAN
MEDIAN
RANGE MEAN MEDIAN
HANGE
MEAN
MEDIAN
TEMP (C)
5.4
— 6.6
5.9
5.9
12.9
— 22.9 18.6 20.3
16.0
— 17.8
17.2
17.2
DISS OXY (MG/L)
7.6
— 11.4
10.7
11.0
3.6
— 8.2 6.5 6.8
7.2
— 7.8
7.6
7.6
CNDCTVY (MCROMO)
491.
— 510.
499.
497.
622.
— 750. 697. 721.
658.
— 667.
663.
665.
PH (STAND UNITS)
8.4
— 8.5
8.4
8.4
8.0
— 8.5 8.3 8.2
7.8
— 7.9
7.8
7.8
TOT ALK (MG/L)
199.
2)6.
204.
203.
°°•***
183.
— 232.
194.
187.
TOT P (MG/LI
0.018
— 0.040
0.026
0.026
*OO• 4
0.024
— 0.104
0.044
0.036
ORTHO P (MG/LI
0.002
— 0.007
0.003
0.003
°°°
—*****0** 0***
0.003
— 0.008
0.005
0.005
N02.N03 (MG/LI
0.540
— 0.670
0.600
0.600
00*00*
*0*****0 **000*****D0*
0.300
— 0.600
0.35..
0.310
AMMONIA (MG/LI
0.020
— 0.050
0.034
0.035
°*°*°
—°°‘‘‘
0.040
— 0.160
0.OGf
0.060
KJEL N (MG/LI
0.200
— 0.600
0.271
0.200
0*000*
..0**90*004*0•0•*****0 *
0.400
— 1.200
0.625
0.550
INORG N (MG/LI
0.570
— 0.720
0.634
0.630
00000*
**•*.*•***••**•*•*•***
0.340
— 0.750
0.422
0.360
TOTAL N (MG/LI
0.750
— 1.140
0.871
0.830
..o* .
0.700
— 1.510
0.979
0.860
CHLRPYL A (UGh)
12.0
— 13.3
12.5
12.3
0.5
— 3.1 1.8 1.7
10.1
— 12.4
11.6
12.4
SECCPII (METERS)
0.9
1.8
1.3
1.0
0.6
— 7.6 6.4 5.0
0.4
— 2.1
1.2
1.2
‘3 ,
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6
B. Biological characteristics:
1. Phytoplankton -
Sampling Dominant Algal Units
Date Genera per ml
04/16/74 1. Asterionella . 5,173
2. Flagellates 4,362
3. Cryptomonas . 734
4. Stephanodiscus 463
5. Dac y lococc psis p . 386
Other genera 1,120
Total 12,238
07/01/74 1. Cryptomonas p. 860
2. Fragilaria p. 602
3. Asterionella p. 473
4. Flagellates 344
5. Schroederia . 344
Other genera 690
Total 3,313
09/27/74 1. Cryptomonas p . 1,023
2. Flagellates 884
3. Dactylococcopsis p.. 651
4. Melosira . 512
5. Merismo edia p. 419
Other genera 1 ,442
Total 4,931
2. Chlorophyll a -
Sampling Station Chlorophyll a
Date Number ( ig/1 )
04/16/74 1 12.3
2 12.0
3 13.3
07/01/74 1 0.5
2 1.7
3 3.1
09/27/74 1 12.4
2 10.1
3 12.4
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7
Spike (mg/i )
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Ortho P
Conc. (m g/l )
<0.005
<0.055
<0.055
<0.005
Inorganic N
Conc. (m /1 )
0.600
0.600
1.600
1.600
Maximum yield
.(j /1-dry wt. )
0.1
12.5
13.7
0.1
b. September sample -
Spike (mg/i )
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Ortho P
Conc. ( Jl )
0.015
0.065
0.065
0.015
Inorganic N
Conc. [ m9/1 )
0.455
0.455
1 .455
1 .455
Maximum yield
mg/l -dry wt. )
0.8
4.8
10.0
0.3
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
a. April sample -
2. Discussion —
The control yields of the assay alga, Selenastp-um capri—
cornutum , indicate that the potential primary productivity
of McConaughy Reservoir was low in the spring (04/16/74) and
moderate in the fall (09/27/74). Also, significant increases
in yield with the addition of phosphorus alone indicate that the
reservoir was limited by phosphorus on both occasions. Note
that the addition of nitrogen alone resulted in yields no
greater than those of the controls.
The reservoir data indicate phosphorus limitation in April
and September (the mean inorganic nitrogen to orthophosphorus
ratios were 63 to 1 or greater at all stations).
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8
IV. NUTRIENT LOADINGS
(See Appendix E for data)
For the determination of nutrient loadings, the Nebraska National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page v) except for site A-3.
This site, the surface water outlet in Kingsley Dam, was not in
use on any sampling occasion, so no samples were collected. Sampling
was begun in August, 1974, and was completed in May, 1975.
Through an interagency agreement, stream flow estimates for the
year of sampling and a unormalizedhi or average year were provided by
the Nebraska District Office of the U.S. Geological Survey for the tributary
sites nearest the reservoir.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of a U.S. Geological Survey computer
program for calculating stream loadings*. Nutrient loads shown are
those measured minus point-source loads, if any.
Nutrient loads for unsampled “minor tributaries and immediate
drainage” (“ZZ” of U.S.G.S.) were estimated using the nutrient loads
at station C-i, in kg/km 2 /year, and multiplying by the ZZ area in km 2 .
The operator of the Lewellen wastewater treatment plant provided
monthly effluent samples and corresponding flow data. The operator
of the Oshkosh wastewater treatment plant provided monthly effluent
samples without flow estimates; nutrient loads from this source were
estimated at 1.134 kg P and 3.401 kg N/capita/year, and flows were esti-
mated at 0.3785 m 3 /capita/day. The results of the analyses of the
Oshkosh samples are included in Appendix E.
* See Working Paper No. 175.
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9
A. Waste Sources:
1. Known municipal* -
Pop. Mean Flow Receiving
Name Served Treatment [ m Jd) Water
Lewellen 376 act, sludge 333.5 North Platte
River
Oshkosh 1,067 act. sludge 403.9 North Platte
River
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
kgP/ %of
Source yr total
a. Tributaries (non-point load)
North Platte River 173,210 90.0
Clear Creek 875 0.5
b. Minor tributaries & immediate
drainage (non—point load) - 14,325 7.5
c, Known municipal STP’s -
Lewellen 265 0.1
Oshkosh 1,210 0.6
d. Septic tanks** - 45 <0.1
e. Known industrial - None - -
f. Direct precipitation*** - 2480 1.3
Total 192,410 100.0
2. Outputs -
Lake outlet - North Platte River 38,575
3. Net annual P accumulation - 153,835 kg.
* Treatment plant questionnaires,
** Estimate based on 113 shoreline dwellings, five campgrounds, and two parks;
see Working Paper No. 175.
See Working Paper No. 175.
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10
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kgN/ %of
Source yr total
a. Tributaries (non-point load) -
North Platte River 3,836,835 90.9
Clear Creek 13,260 0.3
b. Minor tributaries & immediate
drainage (non—point load) - 215,705 5.1
c. Known municipal SIP’s -
Lewellen 800 <0.1
Oshkosh 3,630 0.1
d. Septic tanks* - 1,625 <0.1
e. Known industrial - None - -
f. Direct precipitation** - 152,915 3.6
Total 4,224,770 100.0
2. Outputs -
Lake outlet - North Platte River 1,216,105
3. Net annual N accumulation - 3,008,665 kg.
D. Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km Jyr kg N/km 2 /yr
North Platte River 3 58
Clear Creek 17 256
E. Mean Nutrient Concentrations in Ungaged Stream:
Mean Total P Mean Total N
Tributary Conc. ( q/]j Conc. (mg/i )
Graf Canal 0.123 1.469
* Estimate based on 113 shoreline dwellings, five campgrounds, and two parks;
see Working Paper No. 175.
** See Working Paper No. 175.
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11
F. Yearly Loads:
In the following table, the existing phosphorus loadings
are compared to those proposed by Vollenweider (Vollenweider
and Dillon, 1974). Essentially, his “dangerous loading is
one at which the receiving water would become eutrophic or
remain eutrophic; his “permissible loading is that which
would result in the receiving water remaining oligotrophic
or becoming oligotrophic if morphometry permitted. A meso-
trophic loading would be considered one between “dangerous°
and “permissible”.
Note that Vollenweider’s model may not be applicable to
water bodies with short hydraulic retention times.
Total Phosphorus Total Nitrogen
Tot 1 Accumulated Total Accumulated
grams/m 2 /yr 1.36 1.09 29.8 21.2
Vollenweider phosphorus loadings
(g/m 2 /yr) based on mean depth and mean
hydraulic retention time of McConaughy Reservoir:
“Dangerous” (eutrophic loading) 0.56
“Permissible” (oligotrophic loading) 0.28
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12
V. LITERATURE REVIEWED
1-lartung, Ray, 1974. Personal comunication (reservoir mor-
phometry). NE Dept. of Env. Contr. Lincoln.
Vollenweider, R. A., and P. J. Dillon, 1974. The application of
the phosphorus loading concept to eutrophication research.
Natl. Res. Council of Canada Publ. No. 13690, Canada Centre
for Inland Waters, Burlington, Ontario.
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VI. APPENDICES
APPENDIX A
LAKE RANKINGS
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE MEDIAN M1 DIAN 500- MEAN 15- MEUIAN
CODE LAKE NAME TOTAL P INOPG N MEAN EC CHLO A MIN DO DISS O UMO ?
3101 BRANCpIEO OAK 0.044 0.070 456.44’. 17.033 9.’e00 0.013
3102 HARLAN COUNTY R€SE VO1M 0.112 0.365 476.111 27.822 12.200 0.061
3103 HARRY 0. STRUNK (MEOICIN 0.064 0.460 470.500 14.367 14.200 0.009
3104 HUC,M BUTLER (I ED wILLOw) 0.06) 0.090 468.d7 5 16.61? 14.400 0.0)’ .
3105 JOHNSON PESER OIR 0.075 .).3’.0 ‘.77.667 26.133 8.600 0.009
3106 LAKE MCCONAUGr4Y 0.027 0.585 409.5 5 8.644 11.400 0.004
3107 PAWNEE LAKE 0.060 0.175 4S3.000 15.367 8.800 0.020
3108 SHEP MAN COUNTY , ESERVOIR 0.067 0.090 451.167 6.717 11.800 0.050
3110 SwANSON PESERVOIN 0.067 0.090 466.J33 1 ’ .. 450 11.000 0.016
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P [ CENT OF LAKES ITi i H1Gp-4 [ VALUES (NUMBER OF LAKES WiTH H16(1E VALUES)
LA (E
CODt
LAKE NAME
MEDIAN
TOTAL
P
MEDIAN
LNO (G
N
500—
MEAN
SEC
MEAN
CHLONA
15—
MIN
J3O
MEUIAN
DISS ()rTrlO P
INUEX
Nt)
3101
BRANCHED OAi
88 (
7)
100 (
8)
63
(
5)
25 (
2)
75 (
6)
63
1 5)
41
3102
HARLAN COUNTY [ SERvoIM
0 (
0)
25 (
2)
13
(
1)
0 (
0)
25 1
)
0
( 0)
63
3103
MARRY D. STRUNK (MEDICIN
50 C
4)
13 (
1)
25
C
2)
75 1
6)
13 1
1)
81
1 6)
257
3104
HUGrI BUTLER (RED WILLoW)
63 C
5)
75 1
5)
38
(
3)
38 (
3)
0 (
0)
50
1 4)
264
3105
JOHNSON RESERVOIr
13 C
))
38 C
3)
0
(
0)
13 C
1)
100 C
8)
81
C 6)
245
3106
LAKL MCCONAUGHY
100 C
8)
0 (
0)
100
C
8)
88 C
7)
50 C
‘.)
100 C 8)
438
3107
PAWNEE LAKE
75 C
6)
50 C
4)
75
(
6)
50 C
4)
88 C
7)
25 C 2)
363
3108
SHERMAN COUNTY RESERvOIR
38 C
3)
75 C
5)
88
(
7)
100 1
8)
38 (
3)
13 I 1)
352
3110
SWANSON RESERVOIR
25 C
2)
75 (
5)
50
C
‘.)
63 C
5)
63 (
5)
38 ( 3)
314
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LAKES RANKED BY INOE NOS.
RANK LAKE CODE LAKE NAME INOEX NO
1 3106 LA cE MCCONAUGI-4Y 438
2 3101 BRANCHED OAK 414
3 3107 PAWNEE LAKE 363
‘. 310M SHERMAN COUNTY ESER OIR 352
5 3110 SwANSON kESERV(,L 314
6 31U4 HUGH BUTLER (RED WILLOW) 264
7 3103 HARRY 0. ST UN c (MEDICIN 257
8 3105 JOHNSON RESERVOIR 245
9 3102 HARLAN COUNTY RESERVOIR 63
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APPENDIX B
CONVERSION FACTORS
-------
CONVERSION FA(;TORS
Flectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
Cubic meters x 8.107 x = 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 = lbs/square mile
-------
APPENDIX C
TRIBUTARY FLOW DATA
-------
TRIBJTARY FLOW INFORMATION FOR NEBRASKA
12/23/75
NOTE 0*0 TOTAL ZZ OR.
MEAN MONTHLY FLOWS
TRIBUTARY MONTH YEAR
3106A1 8 74
9 74
10 74
11 74
12 74
1 75
2 75
3 75
4 75
5 75
6 75
7 75
3 106A2 8 74
9 74
10 74
11 74
12 74
1 75
2 75
3 75
4 75
5 75
6 75
7 75
TOTAL DRAINAGE AREA OF LAKE = 66821.9
SUM OF SUB-DRAINAGE AREAS = 66821.9
AREAS DIRECTLY CONTRIBUTING. 33300 SO. Ml. TOTAL AREA.
AND DAILY FLOWS(CMS)
MEAN FLOW DAY
77.42 24
52.56 15
15.57 6
12.23 24
30.55 8
19.77 19
13.76 8
11.92 16
18.66 13
29.19 18
34.01
104.97
24.58 24 22.09
48.08 15 52.39
56.49 6 59.47
44.71 24 43.04
42.39 8 45.87
43.07 19 50.97
39.96 8 33.98
34.55 16 34.83
44.74 13 43.61
37.69 18 39.36
36.90
27.50
LAKE CODE
3106 LAKE
MCCONAUGP4Y
TOTAL
DRAINAGE AREA
OF LAKE(S0 K14)
66821.9
TRIBUTARY
SUB—DRAINAGE
AREA(58 KM)
JAN FEB
MAR
APR
MAY
NORMALIZED FLOWS(CMS)
JUN JUL AUG
SEP
OCT
NOV
DEC
MEAN
3106A1
3106A2
310 6C1
31061Z
66821.9
65785.9
51.8
986.2
20.56 19.91
36.53 40.21
0.24 0.25
6.48 6.74
19.09
41.91
0.26
6.94
19.26
40.78
0.23
6.20
36.81
46.44
0.22
4.45
48.14 75.89 75.89
56.07 27.84 20.39
0.20 0.16 0.16
3.51 1.98 1.61
49.84
35.68
0.22
2.21
29.17
49.55
0.22
3.71
26.28
47.01
0.25
6.17
24.47
40.21
0.24
6.46
37.26
40.17
0.22
4.69
SUMMARY
541 • 71
445.28
TOTAL FLOW IN =
rOTAL FLOW OUT
FLOW
FLOW DAY
FLOW DAY
75.89
52.95
22.37
13.42
31.15
14.38
15.06
11.30
10.70
39.36
-------
TRIBUTARY FLOW INFORMATION FOR NEBRASKA 12/23/75
LAKE CODE 3106 LA MCCONAUGHY
MEAN MONTHLY FLOWS AND UAILY FLOwS(CMS)
TRIBUTARY MONTH YEAR MEAN FLOW DAY FLOW DAY FLOW DAY FLOW
310 6C1 8 74 0.12 24 0.10
9 74 0.16 15 0.15
10 74 0.22 6 0.23
11 74 0.29 24 0.27
12 74 0.30 8 0.28
1 75 0.30 19 0.34
2 75 0.28 8 0.34
3 75 0.28 16 0.30
4 75 0.31 13 0.21
5 75 0.27 18 0.28
6 75 0.20
7 75 0.11
3106 1Z 8 74 0.54 2’. 1.27
9 74 1.81 15 1.76
10 74 3.94 6 2.35
11 74 6.06 24 6.14
12 74 6.40 8 6.26
1 75 6.54 19 7.62
2 75 6.26 8 b.66
3 75 6.26 16 6.88
4 75 7.08 13 6.74
5 75 5.69 18 5.52
6 75 3.34
7 75 0.08
-------
APPENDIX 0
PHYSICAL and CHEMICAL DATA
-------
STORET RETRIEVAL DATE 7S/12/23
310601
41 12 45.0 101 40 50.0
LAKE MCCONAUGHY
31101 NEBRASKA
1 IEPALES 2111202
4 0117 FEET DEPTH
00010 00300 00077 00094 00400 00410 00610 00625 00630 00671
DATE TIME DEPTH WATER DO TRANSP CNDUCTVY PH T ALK NH3—N TOT KJEL NO2 NO3 PHOS—DIS
FROM OF TEMP SECCHI FIELD CACO3 TOTAL N N—TOTAL ORTPIO
TO DAY FEET CENT MG/L INCHES MICROMHO SU HG/L MG /L MG/L MG/L HG/L P
74/04/16 11 15 0000 6.4 36 509 8.40 202 0.040 0.600 0.540 0.007
U 15 0005 6.4 10.8 510 8.40 199 0.020 0.300 0.550 0.004
11 15 0015 6.3 10.8 505 8.45 199 0.020 0.200 0.550 0.004
11 15 0040 6.2 10.8 508 8.45 202 0.040 0.400 0.590 0.003
11 15 0075 6.2 11.0 504 8.40 203 0.030 0.200 0.560 0.003
11 15 0110 5.9 10.8 500 8.40 202 0.030 0.200 0.600 0.003
74/07/01 10 40 0000 20.3 7.6 300 721 8.20
10 40 0005 19.1 7.4 706 8.20
10 40 0020 18.7 7.2 700 8.20
10 40 0037 17.2 6.8 680 8.20
10 40 0055 14.0 6.4 634 8.10
10 40 0080 13.2 4.2 624 8.00
10 40 0102 12.9 3.6 622 8.00
74/09/27 11 15 0000 17.8 7.6 84 665 7.78 184 0.060 0.700 0.300 0.008
11 15 0005 17.7 7.8 665 7.77 183 0.040 0.500 0.300 0.005
11 15 0019 17.8 7.4 666 7.77 183 0.040 0.400 0.300 0.004
11 IS 0050 17.8 7.6 666 7.77 185 0.050 0.500 0.300 0.006
11 15 0085 17.7 7.2 664 7.78 185 0.060 0.400 0.300 0.005
00665 32217 00031
DATE TIME DEPTH P 1405—TOT CIILRPHYL INCDT LT
FROM OF A REMNING
TO DAY FEET MG/I P (JG/L PERCENT
74/04/16 11 15 0000 0.040 12.3
11 15 0005 0.027
11 IS 0015 0.027
11 15 0040 0.031
11 IS 0075 0.026
11 15 0110 0.019
74/07/01 10 40 0000 0.5
10 40 0007 50.0
10 40 0037 1.0
74/09/27 11 15 0000 0.032 12.4
11 15 0003 50.0
11 15 0005 0.026
11 15 0019 0.024 1.0
ii 15 0050 0.025
11 15 0085 0.027
-------
STORET RETRIEVAL DATE 75/12/23
310602
41 15 20.0 101 54 20.0
LAKE MCCONAUGHY
31101 NEBRASKA
LIEPALES 2111202
4 0065 FEET DEPTH
00010 00300 00077 00094 00400 00410 00610 00625 00630 00671
DATE TIME DEPTH WATER DO T ANSP CNDUCTVY PH T ALK NH3—N TOT KJEL N02&N03 PHOS—DIS
FROM OF TEMP SECCI41 FIELD CACO3 TOTAL N N—TOTAL ORTHO
TO DAY FEET CENT MG/L INCHES MICROUHO SU MG/I MG/L MG/L UG/L MG/L P
74/04/16 11 50 0000 5.6 72 492 8.40 203 0.040 0.300 0.640 0.004
11 50 0005 5.6 11.0 492 8.40 216 0.030 0.200 0.630 0.003
11 50 0015 5.5 11.0 492 8.45 212 0.050 0.200 0.670 0.003
11 50 0030 5.5 11.0 493 8.40 212 0.040 0.200 0.630 0.003
11 50 0060 5.4 11.0 491 8.40 204 0.040 0.200 0.630 0.003
74/07/01 11 15 0000 20.6 8.2 196 727 8.50
11 15 0005 20.6 7.6 729 8.50
11 15 0015 20.6 7.4 726 8.50
11 15 0033 20.3 7.6 722 8.40
11 15 0045 14.8 6.0 643 8.20
11 15 0068 14.0 5.2 636 8.20
74/09/27 12 10 0000 17.2 7.8 48 658 7.87 187 0.060 0.600 0.310 0.005
12 10 0005 17.2 7.8 658 7.86 190 0.060 0.500 0.310 0.004
12 10 0015 17.2 7.6 659 7.85 186 0.050 1.200 0.310 0.004
12 10 0035 17.2 7.6 659 7.86 187 0.050 0.600 0.310 0.004
12 10 0055 17.2 7.8 659 7.85 189 0.070 0.400 0.320 0.003
00665 32217 00031
DATE TIME DEPTH PHOS—TOT CPILRPHYL INCDT LT
FROM OF A PENNING
TO DAY FEET MG/L P UG/L PERCENT
74/04/16 11 50 0000 0.023 12.0
11 50 0005 0.021
11 50 0015 0.018
11 50 0030 0.021
11 50 0060 0.019
74/07/01 11 IS 0000 1.7
11 15 0004 50.0
74/09/27 12 10 0000 0.039 10.1
12 10 0005 0.037
12 10 0014 1.0
12 10 0015 0.037
12 10 0035 0.035
12 10 0055 0.041
-------
STORET RETRIEVAL DATE 75/12/23
310603
41 17 10.0 101 58 00.0
LAKE HCCONAUGHY
31101 NEBRASKA
11EPALES 2111202
4 0022 FEET DEPTH
00010 00300 00077 00094 00400 00410 00610 00625 00630 00671
DATE TIME DEPTH WATER 00 TRANSP CNDUCTVY PH T ALK NP$3—N TOT KJEL N02&N03 PrIOS—DIS
FROM OF TEMP SECCHI FIELD CACO3 TOTAL N N-TOTAL ORTI40
TO DAY FEET CENT MG/L INCHES MICROMHO SU MG/L MG/L MG/L MG/L MG/L P
74/04/16 12 20 0000 5.9 40 499 8.50 203 0.050 0.400 0.620 0.005
12 20 0005 5.9 11.4 495 8.50 202 0.020 0.200 0.590 0.002
12 20 0015 5.8 7.6 495 8.50 202 0.020 0.200 0.600 0.002
74/07/01 11 45 0000 22.9 6.8 24 750 8.40
11 45 0005 22.9 6.8 749 8.50
11 45 0015 22.5 6.2 742 8.50
11 45 0022 22.4 6.0 739 8.50
74/09/27 12 45 0000 16.0 7.6 14 665 7.95 232 0.110 0.900 0.600 0.006
12 45 0007 16.1 7.6 667 7.93 232 0.160 0.800 0.590 0.005
00665 32217 00031
DATE TIME DEPTH PHOS—TOT CHLRPHYI INCDT LT
FROM OF A REPINING
TO DAY FEET 14G/L P UG/L PERCENT
74/04/16 12 20 0000 0.038 13.3
12 20 0005 0.030
12 20 0015 0.027
74107/01 11 45 0000 3.1
11 45 0005 1.0
74/09/27 12 45 0000 0.104 12.4
12 45 0007 0.102
-------
APPENDIX E
TRIBUTARY and WASTEWATER
TREATMENT PLANT DATA
-------
STORET RETRIEVAL DATE 76/01/27
3106A1
41 12 42.0 101 40 03.0
NOkTH PLATTE RIVER
31047 7.5 OGALLALA
0/C w MCCONAuGHY LAKE
SANK SAMPLE AT KINGSLEY OAM SPILLWAY
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH N02&N03 TOT KJEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
74/08/24 17 10 0.208 0.600 0.185 0.052 0.060
74/09/15 14 47 0.248 0.700 0.100 0.010 0.025
74/blOb 13 30 0.336 0.600 0.190 0.025 0.030
74/11/24 15 05 0.540 0.500 0.024 0.016 0.030
74/12/OS 09 30 0.540 0.600 0.020 0.015 0.040
75/01/19 09 50 0.650 0.700 0.088 0.020 0.030
75/02/08 15 30 0.688 1.000 0.092 0.016 0.030
75/03/16 14 45 1.005 1.050 0.133 0.036 0.040
75/04/13 10 00 0.690 0.750 0.170 0.015 0.040
75/05/18 13 30 0.680 0.550 0.050 0.005 0.010
-------
STORET RETRIEVAL DATE 76/01/27
3106A2
45 19 05.0 102 08 35.0
NONTH PLATTE RIVER
31 7.5 LEWELLEN
T/C W MCCONAUGHY LAKE
Co ND HWY GROG 1 MI S OF LEWELLEN
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH N02&N03 TOT KJEL Nr$3—N PHOS—DIS PHOS—TOT
FROM OF N-TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P
74/08/24 15 20 1.380 0.300 0.015 0.010 0.015
74/09/15 13 16 1.680 1.500 0.060 0.035 0.250
74/10/06 12 05 2.000 1.000 0.030 0.035 0.200
74/11/24 14 00 1.100L 0.700 0.016 0.040 0.100
74/12/08 07 55 2.400 1.300 0.380 0.045 0.110
75/01/19 08 45 2.240 0.800 0.168 0.056 0.060
75/02/08 14 05 2.695 1.000 0.304 0.068 0.090
75/03/16 13 37 2.400 2.200 0.025 0.133 0.120
75/04/13 07 30 2.200 0.950 0.115 0.080 0.220
75/05/18 12 ?5 1.250 1.050 0.075 0.015 0.180
L ACTUAL VALUE tS KNOWN TO dt
REAEER THAN VALUE i1VL
-------
STORET RETRIEVAL DATE 76/01/27
3l06 U
41 18 30.0 102 03 52.0
GP AF CANAL
31 7.5 RUTHTON
T/C W MCCONAUGHY LAKE
SEC kD B DG 4,4 M SE OF LEWELLEN
11EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH NO2 .NO3 TOT P JEL NH3—N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL URTHO
TO DAY FEET MG/L MG/L MC /L MG/L P MG/L P
74/08/24 16 00 0,528 0.575 0.020 0.125 0.210
74/09/15 13 ss 0.720 0.400 0.015 0.100 0.130
74/10/06 1? 45 0.690 1.100 0.050 0.110 0.210
74/11/24 12 30 0.416 1.100 0.064 0.024 0.060
74/12/08 08 25 0.768 1.200 0.050 0.045 0.110
75/03/16 14 05 0,371 1.450 0.015 0.033 0.050
75/04/13 08 10 0.062 0.900 0.100 0.030 0.090
-------
STORET I ETRIEVAL DATE 76/01/27
310bC1
41 19 21.0 102 02 23.0
CLEAR CREEK
31 7.5 UTHTON
T/C W MCCONAUGHY LAKE
NE HWY 92 8RDG 5.9 MI E OF LEWELLEN
1 1EPALES 2111204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665
DATE TIME DEPTH N02&N03 TOT KJEL NH3-N PHOS—DIS PHOS—TOT
FROM OF N—TOTAL N TOTAL ORTHO
TO DAY FEET MG/L MG/I MG/L HG/L P MG/I P
74/08/24 15 40 1.260 0.300 0.030 0.080 0.115
74/09/15 13 40 1.360 0.200 0.020 0.080 0.100
74/10/06 12 25 1.480 0.500 0.047 0.085 0.110
74/11/24 14 15 1.100L 0.500 0.064 0.104 0.160
74/12/08 08 10 1.680 0.700 0.040 0.100 0.130
75/01/19 09 00 1.600 0.800 0.032 0.112 0.120
75/02/08 14 30 1.690 0.500 0.082 0.112 0.140
75/03/16 13 50 1.510 0.775 0.062 0.113 0.140
75/04/13 07 55 1.450 0.450 0.037 0.100 0.120
75/05/18 12 35 1.050 0.550 0.075 0.116 0.140
L ACTUAL VALUE 1 s 4OwN To ti
u EMTtJ THAN VALUE GIVEN
-------
STORET RETRIEVAL DATE 76/01/27
3106AA AS31O6AA
‘.1 19 30.0 102 08 00.0
LEWELLEN
31047 GARDEN Co NE
T/C,w. MCCONAUGHY LAKE
NORTH PLATTE RIVER
1 1EPALES
P000 376
2141204
0000 FEET OEPTPI
00630
00625
00610
00671
006 5
50051
50053
DATE
TIME
DEPTH
N02&N03
TOT KJEL
NH3-N
PriOs—DIS
PHOS-TOT
FLOW
CONDUIT
FROM
OF
N—TOTAL
N
TOTAL
ORTHO
RATE
FLOw—MGI)
TO
DAY
FEET
MG/L
MG/L
HG/L
MG/L P
MG/L P
INST P4GD
MONTHLY
74/10/07
15
30
0.240
13.000
0.190
3.300
5.500
74/12/12
14
50
1.560
2.800
0.050K
2.200
3.000
75/01/07
15
25
2.000
7.400
0.050K
1.880
2.600
75/02/07
15
20
0.800
1.000K
0.050K
2.300
2.300
0.090
75/03/09
15
35
0.057
3.400
0.192
2.740
3.100
0.080
75/04/10
14
15
1.280
3.000
0.260
0.300
1.700
0.090
0.080
75/06/25
15
50
0.025
7.300
0.100
2.400
2.500
0.090
0.100
75/01/21
0
30
0.050
21.000
1.250
0.790
1.500
0.063
0.090
75/08/18
08
?0
0.050
6.000
0.025K
0.710
1.500
0.106
0.092
75/09/19
10
00
1.800
4.200
0.025K
2.000
2.800
0.063
0.085
K VALUE KNOWN TO E
LESS TH. N INDIC \TED
-------
STORET RETRIEVAL DATE lb/C 1/27
310 6A8 AS3106AB P001067
41 24 00.0 102 20 00.0
OS HK 0 S H
31 GARDEN Co NE
T/C.l. MCCONAUGHY LAKE
NORTH PLATTE RIVER
1IEPALES 2141204
4 0000 FEET DEPTH
00630 00625 00610 00671 00665 50051 50053
DATE TIME DEPTH NO2 NO3 TOT KJEL NI$3—N PHOS—DIS PHOS—TOT FLOW CONDUIT
FROM OF N—TOTAL N TOTAL ORTHO RATE FLOW—MGD
TO DAY FEET MG/L HG/L MG/I MG/I P MG/L P INST MGD MONTHLY
74/10/08 10 45
CPU)— 4.120 7.200 0.050K 2.800 10.000
74/10/08 17 00
74/11/14 10 00
CPU)— 10.600 2.600 0.190 6.900 7.200
74/11/14 15 30
74/12/12 10 00
CP(T)— 9.600 5.200 0.050K 6.600 7.700
74/12/12 16 00
75/01/11 10 00
CP(T)— 16.000 24.000 0.230 7.180 10.500
75/01/11 15 00
75/02/14 10 00
CP(T)— 13.400 7.000 0.080K 7.200 7.300
75/02/14 16 00
75/03/21 10 00
CP(T)— 1.520 4.400 3.700 7.100 7.100
75/03/21 15 30
75/04/09 10 00
CPU)— 0.640 19.000 0.240 8.600
75/04/09 15 30
75/05/12 10 00
CPU)— 0.100 22.000 6.200 5.600 8.400
75/05/12 16 00
75/06/10 10 00
CP(T)— 0.050 18.000 9.100 7.200 7.200
7S/06/10 15 45
75/07/08 09 45
CPU)— 0.050 14.000 2.600 5.300 6.400 0.100 0.105
75/07/08 16 30
75/08/16 09 30
CPU)— 1.100 11.000 0.218 6.000 6.875
75/08/16 14 30
75/09/08 10 45
CP(T)— 0.150 13.000 0.125 6.500 8.200
75/09/08 16 00
K VALUE KNOWN TO bE
LESS THAN INDICATED
-------
STORE! RETRIEVAL DATE 76/01/27
3106A8 AS31O6AB P001067
41 24 00.0 102 20 00.0
OSHKOSH
31 t,A. DEN CO NE
T/C.W. MCCONAUGHY LAKE
NORTH PLATTE lIVER
11EPALES 2141204
4 0000 FEET DEPTH
00630 00625 oo io 00671 00665 50051 50053
DATE TIME DEPTH N02&N03 TOT KJEL NH3-N PHOSDIS PHOS—TOT FLOW CONDUIT
FROM OF N-TOTAL N TOTAL ORTHO RATE FLOW—MGD
TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P INST MGD MONTHLY
75/10/07 10 00
CP(T)— 0.150 12.500 0.433 7.000 9.000
75/10/07 16 00
------- |