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USGS Water-Year Summary 2024
11118500 Ventura River near Ventura, CA
LOCATION - Lat 34°21'08", long 119°18'27" referenced to North American Datum of 1927, Ventura County, CA, Hydrologic Unit 18070101, in southeast corner of Santa Ana Grant, on right bank, attached to downstream side of bridge on Casitas Pass Road at Foster Memorial Park, 0.2 mi downstream from Coyote Creek, and 5 mi north of Ventura.
DRAINAGE AREA - 188 mi².
REVISIONS HISTORY - WSP 1565: 1957. WSP 1928: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - September 1911 to January 1914, October 1929 to current year; combined records of river and diversion, October 1932 to September 2007.
GAGE - Water-stage recorder. Datum of gage is 203.77 ft above NAVD of 1988. See WSP 1315-B for history of changes prior to Nov. 2, 1949. Nov. 2, 1949, to June 12, 1969, at site 80 ft downstream, at datum 9.00 ft lower. June 13, 1969, to Dec. 22, 1986, at site 370 ft upstream, at datum 5.00 ft lower. October 1932 to September 2007, water-stage recorder and Parshall flume on diversion.
REMARKS - Flow partly regulated since March 1948 by Matilija Reservoir (station 11115000), usable capacity, 1,480 acre-ft, and since October 1959 by Lake Casitas (station 11108133), capacity, 323,700 acre-ft. Water diverted to Lake Casitas on Coyote Creek since January 1959. Diversion by City of Ventura for municipal supply began prior to 1911. For records of combined discharge of river and Ventura City Diversion (station 11118400), see station 11118501 (discontinued in 2007).
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 63,600 ft³/s, Feb. 10, 1978, gage height, 24.14 ft, from rating curve extended above 34,000 ft³/s, maximum gage height, 29.3 ft, Jan. 25, 1969, present datum, from floodmarks; no flow at times in many years.
Combined river and diversion (1933-2007): Maximum discharge, 63,600 ft³/s, Feb. 10, 1978; no flow Nov. 28, 29, 1977, Oct. 23-26, 1989, July 9-11, 1990, and many days during 1994.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1907-08, 1967 to current year.
CHEMICAL DATA: Water years 1907-08, water years 1967-79.
SEDIMENT DATA: Water years 1969-73, 1975 to 2015.
PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 1968 to September 1969, October 1970 to September 1973, October 1974 to September 1981, and October 1985 to September 1986.
SUSPENDED-SEDIMENT DISCHARGE: October 1968 to September 1973, October 1974 to September 1981, and October 1985 to September 1986.
