USGS Water-Year Summary 2020
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.
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.
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.
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 TEMPERATURE: Water years October 1985 to September 1989, October 1994 to current year.
INSTRUMENTATION - Water-temperature and specific conductance recorders through June 1997, water-quality monitor since July 1997.