2000 California Hydrologic Data Report
a Elevation, in feet, at end of month.
b Change in contents, in acre-feet.
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, and 3.3 mi northwest of La Porte.
DRAINAGE AREA - 25.8 mi".
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. Records represent total contents at 2400 hours. See schematic diagram of South
Fork Feather River Basin.
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, 94,700 acre-ft, May 7.9, elevation, 5,047.0 ft; minimum,
44,000 acre-ft, several days in January, elevation, 5,009.6 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 1999 TO SEPTEMBER 2000
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 62000 49900 48600 e44100 55200 71500 80100 94200 90600 80100 73100 65800
2 61900 49500 48600 e44000 55300 71800 80400 94200 90400 79800 73000 65500
3 61600 49000 48600 e44000 55500 72100 80900 94300 90100 79700 72800 65400
4 61300 48600 48600 e44000 55800 72200 81400 94300 89600 79400 72400 65100
5 61100 48100 48600 44000 56100 72700 82000 94300 89300 79100 72100 64900
6 61000 47600 48600 44000 56400 73000 82600 94500 89000 79000 72000 64700
7 60700 47300 48400 44000 56700 73300 83200 94700 88700 78800 71700 64500
8 60600 47400 48100 44000 56900 73700 84000 94700 88400 78500 71500 64200
9 60600 47400 47800 44000 57200 74100 84400 94700 88100 78200 71100 64100
10 60600 47400 47300 44000 57700 74300 85100 94500 87700 78100 70800 63800
11 60400 47400 46800 44400 58400 74600 85700 94300 87300 77900 70600 63600
12 60300 47400 46500 44400 58900 74700 86200 94200 87000 77600 70300 63300
13 59900 47400 46000 44600 59900 74900 87600 93800 86500 77500 70100 63200
14 59400 47400 45700 44700 62600 75000 88500 93500 86200 77200 69900 62900
15 58700 47400 e45200 45000 63900 75300 89300 93300 85800 77100 69600 62800
16 58200 47600 e44900 45500 64900 75500 90300 93200 85400 76800 69500 62500
17 57600 47600 e44600 45700 65500 75700 91400 93000 84900 76500 69000 62400
18 57100 47600 e44400 46500 66000 75900 92400 92800 84400 76300 68900 62100
19 56400 47900 e44400 47600 66400 76200 92800 92800 84100 76000 68600 61900
20 55900 48000 e44300 48300 66800 76500 93000 92700 83600 75900 68400 61600
21 55400 48100 e44300 48900 67200 76600 93200 92700 83200 75600 68100 61300
22 54800 48100 e44300 49200 67800 76900 93300 92700 82900 75300 68000 61100
23 54400 48100 e44300 49900 68200 77200 93300 92700 82500 75200 67700 60800
24 53800 48100 e44200 51300 68400 77500 93500 92500 82000 74900 67500 60700
25 53400 48200 e44200 52400 68600 77800 93500 92500 81700 74700 67300 60400
26 52800 48200 e44200 53100 69300 78100 93700 92400 81300 74400 67100 60200
27 52700 48300 e44200 53600 70200 78400 93700 92000 81100 74100 66800 59900
28 52100 48300 e44100 53900 70600 78800 93800 91900 80900 74000 66700 59800
29 51600 48300 e44100 54300 71200 79100 94000 91500 80600 73700 66400 59500
30 51100 48600 e44100 54600 --- 79400 94000 91200 80400 73600 66200 59300
31 50600 --- e44100 54800 --- 79800 --- 90900 --- 73400 65900 ---
MAX 62000 49900 48600 54800 71200 79800 94000 94700 90600 80100 73100 65800
MIN 50600 47300 44100 44000 55200 71500 80100 90900 80400 73400 65900 59300
a 5015.4 5013.6 5009.7 5019.1 5031.6 5037.5 5046.6 5044.7 5037.9 5033.1 5027.7 5022.6
b -11700 -2000 -4500 +10700 +16400 +8600 +14200 -3100 -10500 -7000 -7500 -6600
CAL YR 1999 b -17000
WTR YR 2000 b -3000
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