USGS Water-Year Summary 2021
11254000 San Joaquin River near Mendota, CA
LOCATION - Lat 36°48'38", long 120°22'38" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 sec.07, T.13 S., R.15 E., Fresno County, CA, Hydrologic Unit 18040001, 2.5 mi below Mendota Dam, and 3.5 mi north of Mendota.
DRAINAGE AREA - 3,940 mi².
- WDR CA-00-3: Drainage area.
PERIOD OF RECORD - October 1939 to September 1954, December 1999 to current year.
GAGE - Water-stage recorder. Datum of gage is 133.35 ft above NAVD of 1988. Datum subject to change due to subsidence. Prior to Nov. 3, 1947, at site 200 ft downstream. Prior to Nov. 4, 1953, at datum 2.00 ft higher.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 11,700 ft³/s, June 20, 1941, gage height, 13.75 ft, site and datum then in use, maximum gage height, 16.60 ft, Apr. 22, 2006; no flow at times.
PERIOD OF RECORD
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years October 1953 to September 1966, October 1979 to September 1980.
SEDIMENT DATA: Water years March 2010 to May 2013.
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years January 2013 to current year.
SPECIFIC CONDUCTANCE: Water years January 2013 to current year.