USGS Water-Year Summary for Site 11303000

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Mean,Max.,Min.)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

11303000 Stanislaus River at Ripon, CA

LOCATION - Lat 37°43'47", long 121°06'34" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.29, T.2 S., R.8 E., Stanislaus County, CA, Hydrologic Unit 18040010, on left bank, 15 ft downstream from Southern Pacific Railroad bridge, 1.1 mi southeast of Ripon, and 15 mi upstream from mouth.

DRAINAGE AREA - 1,075 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1940 to current year. April to September 1940 in reports of California Department of Water Resources.

GAGE - Water-stage recorder. Elevation of gage datum is 0.72 ft above NGVD of 1929. October 1940 to Nov. 17, 1953, at site 100 ft upstream at same datum.

REMARKS - Flow regulated by reservoirs and powerplants upstream from station. South San Joaquin and Oakdale Canals (stations 11300500 and 11301000) divert at Goodwin Dam 34 mi upstream for irrigation in the vicinity of Oakdale. See REMARKS for "Stanislaus River below Goodwin Dam, near Knights Ferry" (station 11302000).

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Feb. 12, 1938, reached a stage of 64.4 ft, from floodmarks.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 62,500 ft³/s, Dec. 24, 1955, gage height, 63.25 ft; minimum daily, 0.11 ft³/s, Aug. 4-6, 1977.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 1985-88, 1993-94.
SEDIMENT DATA: Water years 1985-88, 1993-94.

CONTINUOUS WATER-QUALITY DATA:
SPECIFIC CONDUCTANCE: Water years October 1985 to September 1989, July 1997 to current year. (water years 1986-1989, 1997-2023, daily).
WATER TEMPERATURE: Water years October 1985 to September 1989, October 1994 to current year. (water years 1986-1989, 1997-2023, daily).

INSTRUMENTATION - Water-temperature and specific conductance recorders through June 1997, water-quality monitor since July 1997.

REMARKS - Data for the period October 1985 to March 1987 are available in U.S. Geological Survey Open-File Report 88-479. Data for the period April 1987 to September 1988 are available in U.S. Geological Survey Open-File Report 91-74. Specific conductance and water temperature may be affected by upstream regulation. Rating of water quality records discontinued in 2017 water year.