11395020  LITTLE GRASS VALLEY RESERVOIR NEAR LA PORTE, CA

LOCATION.--Lat 39°43'25", long 121°01'10", in SE 1/4 NW 1/4 sec.31, T.22 N., R.9 E., Plumas County, Hydrologic
   Unit 18020123, Plumas National Forest, on right bank 300 ft upstream from dam on South Fork Feather River,
   3.3 mi northwest of La Porte.

DRAINAGE AREA.--25.8 mi2.

PERIOD OF RECORD.--October 1961 to current year.  Monthend elevation and contents only, October 1961 to October
   1962.

GAGE.--Water-stage recorder.  Datum of gage is sea level (levels by Oroville-Wyandotte Irrigation District).
   Prior to Nov. 1, 1962, in valve chamber in dam at same datum.

REMARKS.--Reservoir is formed by rockfill dam.  Storage began in October 1961.  Total capacity, 94,700 acre-ft
   between elevations 4,876 ft, invert of release valve, and 5,047 ft, top of spillway gates, all of which is
   available for release.  Water is released down South Fork Feather River for power development and irrigation.
   See schematic diagram of South Fork Feather River basin.  Records represent total contents at 2400 hours.

COOPERATION.--Records provided by Oroville-Wyandotte Irrigation District, under general supervision of the
   U.S. Geological Survey, in connection with a Federal Energy Regulatory Commission project.

EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 98,000 acre-ft, May 1, 1995, and May 17, 1996, elevation,
   5,049.0 ft; minimum since reservoir first filled, 30,300 acre-ft, many days during 1977, elevation, 4,994.8
   ft.

EXTREMES FOR CURRENT YEAR.--Maximum contents, 98,000 acre-ft, May 17, elevation, 5,049.0 ft; minimum,
   49,400 acre-ft, Nov. 25, elevation, 5,014.3 ft.

                         Capacity table (elevation, in feet, and contents, in acre-feet)
                             (Based on survey by Pacific Gas & Electric Co. in 1963)

                                    4,990      26,300          5,030       68,900
                                    5,000      34,600          5,040       83,500
                                    5,010      44,400          5,048       96,300
                                    5,020      55,900          5,049       98,000

                    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     59700    52900    49500    54800    62600    74600    82000    93500    95200    89600    82500    75000
  2     59700    52700    49500    55000    62800    74300    82500    94000    95000    89500    82200    74700
  3     59500    52600    49500    55100    63000    74100    82900    94500    94700    89200    81900    74400
  4     59300    52300    49600    55200    65500    74100    83300    95000    94700    89000    81600    74100
  5     59100    52100    49700    55200    68400    74300    83800    95300    94500    88700    81400    74000
  6     58900    51900    49700    55300    69900    74400    84100    95500    94300    88500    81100    73700
  7     58700    51600    49700    55400    70800    74600    84600    95600    94200    88400    81000    73400
  8     58500    51400    49700    55400    71400    74900    85100    95600    94000    88100    80700    73300
  9     58200    51200    49700    55500    71500    75000    85700    95800    93800    87900    80400    73000
 10     58000    51000    49700    55700    71500    75200    86200    95800    93700    87600    80300    72700

 11     57700    50700    50400    55800    71700    75500    86600    95800    93500    87400    80000    72400
 12     57400    50500    52400    55800    71700    75600    87100    95800    93300    87100    79800    72200
 13     57200    50400    52900    55900    71700    75700    87400    95800    93200    87000    79500    72000
 14     56900    50200    53100    55900    71700    75700    87700    96000    93000    86600    79400    71700
 15     56700    49900    53500    56100    71700    75900    88400    96500    92800    86300    79100    71700
 16     56500    49700    53600    57300    72000    76200    89300    97100    92500    86200    78800    71400
 17     56300    49600    53600    57700    73300    76500    90100    97800    92400    85800    78500    71200
 18     56000    49600    53700    58500    75200    76600    90400    95600    92200    85500    78400    70900
 19     55800    49600    53800    58900    77100    76900    90300    95500    91900    85400    78100    70600
 20     55500    49500    53800    59300    77600    77200    90300    96100    91700    85200    77900    70500

 21     55300    49500    53800    59500    77500    77600    90100    96600    91500    84900    77600    70200
 22     55100    49500    54000    59900    76900    78100    89800    96600    91400    84700    77400    69900
 23     54800    49500    54000    60200    76500    78400    89600    96500    91200    84400    77200    69800
 24     54600    49500    54000    60800    76000    78700    89600    96300    90900    84300    76900    69500
 25     54400    49500    54000    61000    75700    79000    90100    96300    90700    84000    76600    69300
 26     54300    49500    54000    61200    75500    79100    90700    96100    90600    83800    76500    69000
 27     54000    49500    54000    61700    75200    79700    91200    96000    90400    83500    76200    68800
 28     53800    49500    54200    62000    75000    80100    91700    95800    90300    83300    75900    68500
 29     53600    49500    54300    62100    74900    80400    92400    95600    90100    83000    75700    68400
 30     53400    49500    54500    62300      ---    80700    92800    95500    89800    82900    75500    68100
 31     53100      ---    54700    62500      ---    81000      ---    95300      ---    82600    75200      ---

MAX     59700    52900    54700    62500    77600    81000    92800    97800    95200    89600    82500    75000
MIN     53100    49500    49500    54800    62600    74100    82000    93500    89800    82600    75200    68100
 a     5017.6   5014.4   5019.0   5025.1   5034.1   5038.3   5045.9   5047.4   5044.0   5039.4   5034.3   5029.4
 b      -6700    -3600    +5200    +7800   +12400    +6100   +11800    +2500    -5500    -7200    -7400    -7100

CAL YR 1995  b +8500
WTR YR 1996  b +8300

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