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Water-Year Summary for Site 11470000

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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
11470000 Lake Pillsbury near Potter Valley, CA
LOCATION - Lat 39°24'30", long 122°57'30" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.14, T.18 N., R.10 W., Lake County, CA, Hydrologic Unit 18010103, Mt Diablo meridian, 10.2 mi northeast of town of Potter Valley.
DRAINAGE AREA - 289 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1922 to September 1928 (daily gage heights only), October 1928 to current year. Monthend contents only for some periods, published in WSP 1315-B. Prior to October 1953, published as "at Hullville." WATER TEMPERATURE: Water years 1966-68.
GAGE - Water-stage recorder. Datum of gage is 81.7 ft below NGVD of 1929 (river-profile survey). Prior to Jan. 26, 1950, nonrecording gage at same site and datum.
COOPERATION - Records collected by Pacific Gas and Electric Company, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 77.
REMARKS - Reservoir is formed by concrete overflow-type dam; storage began in December 1921. Beginning Oct. 1, 2005, capacity based on 2005 resurvey. Usable capacity, 74,960 acre-ft, between gage heights 1,822.4 ft, sill of outlet gate, and 1,910.0 ft, top of spillway gates; dead storage, 33 acre-ft. Current capacity table was put into use Oct. 1, 2005. Water is released to Van Arsdale Reservoir where it is released to Eel River below Van Arsdale Reservoir (station 11471500) or is diverted through tunnel to Potter Valley Powerplant (station 1147100); part is then used for irrigation and remainder flows into East Fork Russian River. Records given, including extremes, represent total contents at 2400 hours. See schematic diagram of Eel River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 95,600 acre-ft, May 13, 16, 1925, gage height, 1,910.8 ft, maximum gage height, 1,911.84 ft, Dec. 22, 1964, from floodmarks; minimum contents, 10 acre-ft, Dec. 9, 10, 1931, gage height, 1,822.5 ft.