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Water-Year Summary for Site 11214540

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Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11214540 Helms Powerplant near Wishon Reservoir, CA
LOCATION - Lat 37°02'22", long 118°57'16" referenced to North American Datum of 1927, Fresno County, CA, Hydrologic Unit 18030010, unsurveyed, in Sierra National Forest, underground facility, 2.4 mi north of Wishon Dam, and 2.8 mi south of Courtright Dam.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1989 to current year.
GAGE - Acoustic-velocity meter in penstock. Elevation of powerplant, approximately 1,000 ft below land surface, is 6,286 ft above NGVD of 1929 (levels by Pacific Gas and Electric Co.).
COOPERATION - Records were provided by Pacific Gas and Electric Co., under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2735.
REMARKS - Flow is diverted from Courtright Reservoir (station 11214550) through a tunnel to powerplant which generates electricity during peak power demand, then to Wishon Reservoir (station 11214800). During periods of low power demand, reversible turbines pump water from Wishon Reservoir to Courtright Reservoir. Turbines draft up to 9,000 ft³/s and pump up to 7,200 ft³/s. Figures shown represent the net daily flow from Courtright Reservoir to Wishon Reservoir. Negative values represent net flow pumped to Courtright Reservoir. See schematic diagram of Kings River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 5,440 ft³/s, Dec. 22, 1998, maximum daily pumpage, 6,860 ft³/s, Jan. 5, 1997.