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Water-Year Summary for Site 11234760

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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
11234760 San Joaquin River above Shakeflat Creek, near Big Creek, CA
LOCATION - Lat 37°19'00", long 119°19'43" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.15, T.7 S., R.24 E., Madera County, CA, Hydrologic Unit 18040006, in Sierra National Forest, on right bank, 1,500 ft upstream from Shakeflat Creek, 4,900 ft downstream from Mammoth Pool Dam, and 9.0 mi northwest of town of Big Creek.
DRAINAGE AREA - 1,003 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1959 to current year.
GAGE - Water-stage recorder. Datum of gage is 2,865.50 ft above NGVD of 1929 (levels by Southern California Edison Co.). Auxiliary gage, Mammoth Pool Fishwater Turbine nr Big Creek (station 11234750), with water stage recorder, 1961 until 2004, after, with acoustic velocity meter and water stage recorder backup, and sharp-crested weir at different datum at outlet of dam 4,900 ft upstream, used for low flows of 60 ft³/s or less.
COOPERATION - Records, including diversion to Mammoth Pool Powerplant (station 11235100), were collected by Southern California Edison Co., under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2085.
REMARKS - Flow regulated by Mammoth Pool Reservoir (station 11234700) 4,900 ft upstream. Diversions upstream through Ward Tunnel (see stations 11229500 and 11235500). Since March 1960, most of the water is diverted past this station to Mammoth Pool Powerplant. See schematic diagram of lower San Joaquin River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 80,000 ft³/s, Jan. 2, 1997, gage height, 32.00 ft, from floodmarks, from rating curve extended above 20,300 ft³/s; minimum daily, 0.3 ft³/s, Oct. 14, Dec. 5, 1959.