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. ------- 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 ------- 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. ------- 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 ------- 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). ------- 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 , ------- 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 ------- 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). ------- 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. ------- 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. ------- 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. ------- 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 ------- 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. ------- 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 ------- 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 ------- 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 ------- 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 ------- |