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Water-Year Summary for Site 11254000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00010 Temperature, water(Mean,Max.,Min.,Med.)  
00060 Discharge(Mean)  
00095 Specific cond at 25C(Mean,Max.,Min.,Med.)  

Water year 2024: 2024-10-01 to 2025-09-30
 
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USGS Water-Year Summary 2024
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.
REVISIONS HISTORY - WDR CA-00-3: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1939 to September 1954, December 1999 to current year (starting December 9, 2021 records furnished by U.S. Bureau of Reclamation (USBR)).
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.
COOPERATION - Records provided by U.S. Bureau of Reclamation (USBR), under the general supervision of the U.S. Geological Survey.
REMARKS - All flow regulated by Mendota Dam. Water delivered to the Mendota Pool primarily by the Delta-Mendota Canal, at certain times Mendota Pool storage may be supplemented by inflow from the San Joaquin River and/or James Bypass (Fresno Slough) . Many diversions above station for irrigation.
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.
WATER-QUALITY RECORDS
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.