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Water-Year Summary for Site 11238600

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Available Parameters
00060 Discharge(Mean)  

Water year 2021: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2021
11238600 San Joaquin River above Stevenson Creek, near Big Creek, CA
LOCATION - Lat 37°12'28", long 119°19'44" referenced to North American Datum of 1927, Fresno County, CA, Hydrologic Unit 18040006, unsurveyed, in Sierra National Forest, in intake structure near left bank, 300 ft upstream from Dam No. 6, 3.5 mi upstream from Stevenson Creek, and 4.4 mi west of town of Big Creek.
DRAINAGE AREA - 1,197 mi².
PERIOD OF RECORD - October 1986 to September 1987, October 1992 to September 1994, October 1995 to current year. Records for water years 1951 to 1972 in files of Southern California Edison Co. Records for water years 1974 to 1986 in files of the U.S. Geological Survey.
GAGE - Acoustic-velocity meter and water-stage recorder on Dam 6 since Oct. 1, 1992. Water-stage recorders at various sites downstream prior to 1992. Elevation of gage is 2,200 ft above NGVD of 1929, from topographic map.
COOPERATION - Records, including monthly diversion to Big Creek Powerplant No. 3 (station 11241800), provided by the Southern California Edison Co., under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 120.
REMARKS - Record consists of computed flow over spillway at Dam 6 and flow through fish-water release valve. At times the sluice valve leaks and this flow bypasses the station. Flow regulated by Mammoth Pool Reservoir and Huntington Lake (stations 11234700 and 11236000) and diversions for power development in Big Creek powerplants. Most of the water is diverted past this station to Big Creek Powerplant No. 3. See schematic diagram of lower San Joaquin River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 72,500 ft³/s, Jan. 2, 1997; minimum daily, 3.0 ft³/s, at times in several years.