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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
11251000 San Joaquin River below Friant, CA
LOCATION - Lat 36°59'04", long 119°43'24" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.07, T.11 S., R.21 E., Fresno County, CA, Hydrologic Unit 18040001, on left bank, 0.5 mi west of Friant, 1.5 mi downstream from Cottonwood Creek, and 2 mi downstream from Friant Dam at mile 268.1.
DRAINAGE AREA - 1,676 mi².
REVISIONS HISTORY - WSP 843: 1914 (instantaneous maximum discharge).
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1907 to current year. Published as "near Pollasky" October 1907 to December 1908, and as "near Friant" January 1909 to September 1938. Monthly discharge only for October 1907 to November 1908, published in WSP 1315-A.
GAGE - Water-stage recorder. Datum of gage is 294.00 ft above NGVD of 1929 and 296.55 ft above NAVD of 1988. Oct. 18, 1907, to Nov. 9, 1913, nonrecording gage at site 4.5 mi upstream at different datum. Nov. 10, 1913, to Sept. 30, 1938, water-stage recorder at site 2.5 mi upstream at different datum.
REMARKS - Flow regulated by Millerton Lake (station 11250100) beginning in 1941, and by nine powerplants and eight reservoirs with combined capacity of about 609,300 acre-ft. Diversion for irrigation to Madera and Friant-Kern Canals (stations 11249500 and 11250000) began in 1943 and 1949, respectively. See schematic diagram of lower San Joaquin River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 77,200 ft³/s, Dec. 11, 1937, gage height, 23.8 ft, site and datum then in use; minimum daily, 54 ft³/s, Sept. 15, 1924.
Maximum discharge since construction of Friant Dam in 1941, 60,300 ft³/s, Jan. 3, 1997, gage height, 22.97 ft (provided by U.S. Bureau of Reclamation); minimum daily, 11 ft³/s, Jan. 8, 1977.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years April 1951 to September 1966, October 1983 to September 1984.
SEDIMENT DATA: Water years January 2017.
CONTINUOUS WATER-QUALITY DATA:
SPECIFIC CONDUCTANCE: Water years May 2004 to current year.
WATER TEMPERATURE: Water years May 2004 to current year.
REMARKS - Interruptions in record due to sensor fouling.
Water Year 2016 and prior: Water temperature records rated good. Specific conductance rated good except summer low flow conditions which were sometimes rated poor.
Water Year 2017: The practice of assigning qualitative accuracy ratings to water-quality data was discontinued in WY2017.
Water Year 2016 and prior: Water temperature records rated good. Specific conductance rated good except summer low flow conditions which were sometimes rated poor.
Water Year 2017: The practice of assigning qualitative accuracy ratings to water-quality data was discontinued in WY2017.
