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 18.1 mi northeast of
   town of Big Creek.

DRAINAGE AREA.--90.0 mi2.

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).  See schematic diagram of upper San
   Joaquin River basin.  Records, including extremes, represent contents at 2400 hours.
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, 125,239 acre-ft, July 1, elevation, 7,642.61 ft; minimum,
   64,164 acre-ft, Apr. 26, elevation, 7,607.12 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 1995 TO SEPTEMBER 1996
                                        DAILY OBSERVATION AT 2400 HOURS

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

  1    112329   110235   107898   108562   111859    95821    74710    66281    95856   125239   124646   124516
  2    111406   110199   107862   108544   111895    95071    74240    66929    97412   124979   124516   124553
  3    110829   110163   107862   109730   111967    94341    73608    67631    99222   124720   124313   124572
  4    110307   110145   107934   109730   111859    93576    72947    67975   101128   124905   124128   124591
  5    110073   110109   107951   109514   111859    92242    72255    68085   103540   124942   123961   124591

  6    110091   109965   107969   109550   111931    91464    71582    68335   104982   124868   123961   124591
  7    110109   109766   108005   109568   111352    91464    70976    68948   105054   124831   123924   124609
  8    110145   109173   108005   109874   110595    90739    70466    69579   110451   124739   123887   124628
  9    110181   108257   108023   110073   109820    90032    70116    70227   112637   124591   123869   124646
 10    110217   107754   108023   110091   108975    89310    69863    71056   114433   124387   123869   124665

 11    110217   107754   108347   110127   108167    88606    69595    71982   115925   124424   123869   124665
 12    110235   107772   108670   110181   107611    87972    69311    72963   117330   124683   123998   124628
 13    110271   107808   108796   110199   106841    87288    68963    74305   119013   124702   124072   124609
 14    110289   107808   108867   110235   106071    86537    68600    75247   120810   124387   124128   124146
 15    110289   107826   108041   110307   105411    85771    68288    79195   122485   124646   124165   123315

 16    110289   107844   108975   110307   104679    84989    67960    81213   124054   124924   124183   122448
 17    110289   107844   109029   110541   103931    84228    67897    83619   124794   124887   124165   121601
 18    110289   107862   109047   110685   103256    83517    67600    85125   124831   124776   124109   120755
 19    110289   107862   109083   110775   103024    82893    67131    86622   124868   124794   124054   120021
 20    110289   107862   109119   110829   102332    82304    66605    87853   124813   124831   124017   119196

 21    110289   107862   109119   110920   101694    81715    66049    89018   124776   124887   124165   118317
 22    110235   107844   109173   110938   100880    81163    65477    90083   124609   124850   124091   117458
 23    110199   107898   109245   110974   100068    80594    64928    91015   124442   124850   124146   116581
 24    110181   107898   109263   111100    99416    79992    64485    91861   124368   124850   124183   115706
 25    110181   107916   109298   111244    98711    79378    64241    92000   124442   124794   124220   114850

 26    110199   107916   109334   111298    97921    78764    64164    92069   124479   124813   124220   114033
 27    110217   107916   109370   111443    97219    78118    64424    92121   124591   124850   124220   113179
 28    110217   107898   109406   111515    96537    77476    64806    92259   124591   124850   124257   112329
 29    110235   107898   109514   111587    96537    76850    65187    92588   124702   124887   124331   111515
 30    110217   107898   109604   111678      ---    76145    65693    93437   124702   124665   124405   110721
 31    110181      ---   109676   111786      ---    75410      ---    93889      ---   124609   124479      ---

MAX    112329   110235   109676   111786   111967    95821    74710    93889   124868   125239   124646   124665
MIN    110073   107754   107862   108544    96537    75410    64164    66281    95856   124387   123869   110721
 a    7634.37  7633.10  7634.09  7635.26  7626.29  7614.24  7608.12  7625.17  7642.32  7642.27  7642.20  7634.67
 b      -2745    -2283    +1778    +2110   -15249   -21127    -9717   +28196   +30813      -93     -130   -13758

CAL YR 1995  b +78256
WTR YR 1996  b  -2205

  a Elevation, in feet, at end of month.
  b Change in contents, in acre-feet.