2000 California Hydrologic Data Report
a Elevation, in feet, at end of month.
b Change in contents, in acre-feet.
11231000 LAKE THOMAS A. EDISON NEAR BIG CREEK, CA.
LOCATION - Lat 37°22'09", long 118°59'17", unsurveyed, T.6 1/2 S., R.27 E., Fresno County, Hydrologic
Unit 18040006, Sierra National Forest, in outlet works of Vermillion Valley Dam, on Mono Creek,
and 18.1 mi northeast of town of Big Creek.
DRAINAGE AREA - 90.0 mi".
PERIOD OF RECORD - October 1954 to current year. Prior to 1960, maximum and minimum daily contents were
published.
GAGE - Water-stage recorder. Datum of gage is sea level (levels by Southern California Edison Co.).
REMARKS - Lake is formed by earthfill dam; dam completed and storage began Oct. 12, 1954. Usable capacity,
125,035 acre-ft, between elevations, 7,508.9 ft, invert of outlet works, and 7,642.50 ft, top
of gates in service spillway. Water is diverted at times into lake from Warm Creek (station 11231700).
Water is released for diversion to Ward Tunnel via Mono Creek Conduit (station 11231550). Records,
including extremes, represent contents at 2400 hours. See schematic diagram of upper San Joaquin River
Basin.
COOPERATION - Records were collected by Southern California Edison Co., under general supervision of
the U.S. Geological Survey, in connection with a Federal Energy Regulatory Commission project. Contents
not rounded to U.S. Geological Survey standards.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 125,983 acre-ft, Sept. 26, 1982, elevation, 7,643.55
ft; minimum since appreciable storage was attained, 4,553 acre-ft, Dec. 27, 1987, elevation, 7,552.07
ft.
EXTREMES FOR CURRENT YEAR - Maximum contents, 116,289 acre-ft, July 5, 6, elevation, 7,637.74 ft; minimum,
41,803 acre-ft, Apr. 6, elevation, 7,591.06 ft. Capacity table (elevation, in feet, and contents,
in acre-feet) (Based on table provided by Southern California Edison Co., dated July 22, 1955) 7,550
3,567 7,580 28,515 7,620 85,006 7,555 6,147 7,590 40,454 7,630 102,367 7,560 9,521 7,600 53,769
7,640 120,424 7,570 18,137 7,610 68,616 7,644 127,820
RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 71837 70737 60259 49931 49672 51740 e43128 48767 83754 114759 108652 89035
2 71837 70737 60185 49931 49672 51809 e42857 49658 85174 115196 108005 88829
3 71837 70721 60141 49917 49672 51850 e42600 50722 86503 115633 107467 88726
4 71837 70705 60126 49904 49713 51891 e42330 51712 87938 115961 107145 88520
5 71837 70689 60111 49877 49726 51960 e42073 52793 89585 116289 106823 88212
6 71837 70673 59905 49863 49740 52029 41803 53630 91033 116289 106179 87596
7 71837 70657 59317 49849 49767 51629 41880 54813 92277 116052 105643 87083
8 71837 70689 58749 49836 49795 51285 42112 55836 93420 115943 104983 86367
9 71837 70386 58195 49836 49836 50831 42343 56867 94254 115834 104251 86857
10 71837 69848 57602 49836 49972 50381 42497 57818 94984 115706 103504 85346
11 71837 69611 57054 49822 50013 49958 42728 58516 95716 115506 102758 84837
12 71837 69090 56507 49822 50095 49564 42960 59128 96677 115506 102013 84431
13 71885 68585 55965 49863 50463 49118 43271 59743 97307 115269 101270 84126
14 71869 68069 55423 49863 50559 48727 43582 60273 99204 115269 100526 83720
15 71869 67569 54870 49877 50599 48335 43660 60804 100686 115269 99786 83314
16 71853 67069 54319 49958 50736 47947 43816 61160 102172 115269 98940 82708
17 71614 66605 53783 50013 50777 47572 43972 61607 103558 115087 98308 82203
18 71359 66203 53225 50245 50831 47211 43816 62174 104733 114686 97570 81497
19 71327 65771 52667 50245 50900 46865 44049 62804 105910 114542 96520 80795
20 71279 65279 52222 50286 50981 46494 44127 63800 106877 114215 95786 80193
21 71247 64775 51988 50286 51050 46083 44049 64546 107898 113779 95158 79893
22 71215 64256 51657 50286 51119 e45819 44049 66373 108760 113452 94532 79693
23 71183 63906 51409 50408 51243 e45541 44153 68053 109514 112908 94532 79594
24 71135 63453 51147 50559 51285 e45266 44702 69784 110271 112365 93385 79594
25 71056 62985 50872 50627 51326 e45004 45174 71502 111136 111352 92762 79594
26 70992 62517 50599 50613 51381 e44729 45568 73140 111786 111136 92138 79594
27 70944 62040 50340 50395 51547 e44466 46123 74888 112438 110703 91412 79395
28 70928 61562 50054 50190 51602 e44192 46759 76850 113089 110271 90687 79395
29 70880 61011 49972 49972 51712 e43933 47318 78930 113779 109947 89963 79395
30 70833 60509 49972 49877 --- e43660 47960 80427 114324 109406 89276 79395
31 70785 --- 49958 49754 --- e43387 --- 82035 --- 108867 89139 ---
MAX 71885 70737 60259 50627 51712 52029 47960 82035 114324 116289 108652 89035
MIN 70785 60509 49958 49754 49672 43387 41803 48767 83754 108867 89139 79395
a 7611.37 7604.68 7597.24 7597.09 7598.52 7595.76 7618.24 7636.66 7633.64 7622.42 7616.66
b -1052 -10276 -10551 -204 +1958 -8325 +4573 +34075 +32289 -5457 -19728 -9744
CAL YR 1999 b -26809
WTR YR 2000 b +7558
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