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Water-Year Summary for Site 11395020

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Available Parameters
00054 Reservoir storage(Obs.)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11395020 Little Grass Valley Reservoir near La Porte, CA
LOCATION - Lat 39°43'25", long 121°01'10" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.31, T.22 N., R.9 E., Plumas County, CA, Hydrologic Unit 18020123, in 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 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1961 to current year. Month end elevation and contents only, October 1961 to October 1962.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by Oroville-Wyandotte Irrigation District). Prior to Nov. 1, 1962, in valve chamber in dam at same datum.
COOPERATION - Records provided by South Feather Water and Power Agency, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2088.
REMARKS - Reservoir is formed by rock-fill dam. Storage began in October 1961. Contents based on capacity table furnished by South Feather Water and Power Agency, September 2004. Total capacity, 89,800 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. Records, excluding extremes, represent total contents at 2400 hours. See schematic diagram of South Fork Feather River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 98,000 acre-ft, May 1, 1995, 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.