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, 84,702 acre-ft, June 30, elevation, 7,619.82 ft; minimum, 
39,459 acre-ft, Mar. 23, elevation, 7,589.21 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 7,570 18,137 7,600 53,769 7,630 102,367 7,555 6,147 7,580 28,515 7,610 68,616 7,640 120,424 
7,560 9,521 7,590 40,454 7,620 85,006 7,644 127,820

              RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001

                                               DAILY OBSERVATION AT 2400 HOURS

DAY      OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

1      79294    78831    78432    58224    46097    40733    41281    48889    77228    84599    77969    55594
2      79195    78831    78432    57443    45620    40658    41510    49781    78019    84396    77607    54743
3      79195    78831    78432    57097    45227    40581    41739    50272    78315    84092    76816    53981
4      79195    78831    78432    56321    44990    40963    41971    50763    78714    83788    76031    53225
5      79195    78831    78233    55551    44754    40963    42124    51340    79012    83889    75246    52806

6      79294    78730    78035    54870    44361    40810    42356    52084    79411    83889    74564    52640
7      79294    78730    77640    54108    44049    40733    42510    53002    79810    84092    74078    52472
8      79294    78730    77048    53434    43737    40658    42587    54009    79909    84193    73301    52472
9      79294    78730    76555    52680    43427    40581    42741    55110    80310    84295    72529    52222
10     79294    78730    75769    52016    43192    40505    42895    56307    80511    84295    71949    51974

11     79294    78730    74986    51519    42959    40429    42972    57515    80811    84193    71183    51808
12     79294    78631    74111    51271    42496    40278    43050    58647    81598    83889    70418    51561
13     79294    78631    73333    50940    42266    40202    43206    59434    81900    83585    69563    51395
14     79247    78631    72561    50613    42189    40202    43206    60140    82103    83281    68924    51229
15     79123    78831    71789    50204    42035    40127    43439    60936    82203    83179    68294    50982

16     79046    78730    71023    50040    41957    40051    43517    62099    82305    82675    67667    50818
17     79046    78730    70164    50040    41802    39976    43751    63362    82505    82675    67039   e48156
18     79046    78730    69405    49959    41650    39976    43907    64454    82809    82675    66419   e47776
19     79046    78730    68647    49876    41573    39899    44140    65371    83112    82472    65799   e47396
20     79046    78730    67709    49712    41497    39976    44296    66389    83314    82170    65156    46984

21     79046    78730    66961    49631    41420    39976    44532    67506    83415    81968    64333    46904
22     78946    78730    66127    49388    41420    39534    44689    68631    83517    81766    63422    46825
23     78946    78730    65386    49064    41268    39459    45004    69674    83991    81464    62607    46745
24     78946    78730    64561    48822    41268    39534    45240    70721    84092    81063    61801    46745
25     78946    78631    63739    48497    41192    39534    45555    71773    84193    80762    60996    46666

26     79046    78531    63016    48174    41039    39686    46030    72737    84295    80460    60199    46587
27     79046    78432    62204    47853    40963    39762    46507    73607    84396    80160    59404    46587
28     79046    78432    61309    47452    40810    39988    46904    74288    84499    79560    58617    46507
29     79046    78432    60598    47212      ---    40214    47465    75067    84599    79062    57832    46441
30     79046    78432    59802    46891      ---    40594    48026    75754    84702    78664    57053    46361

31     78831      ---    59011    46414      ---    40899      ---    76537      ---    78365    56364      ---
MAX    79294    78831    78432    58224    46097    40963    48026    76537    84702    84599    77969    55594
MIN    78831    78432    59011    46414    40810    39459    41281    48889    77228    78365    56364    46361
a    7616.32  7616.08  7603.66  7594.60  7590.28  7590.35  7595.81  7614.81  7617.82  7616.04  7601.89  7594.56
b       -564     -399   -19421   -12597    -5604      +89    +7127   +28511    +8165    -6337   -22001   -10003
CAL YR 2000 b +9053
WTR YR 2001 b -33034