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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
11389500 Sacramento River at Colusa, CA
LOCATION - Lat 39°12'51", long 121°59'57" referenced to North American Datum of 1927, Colusa County, CA, Hydrologic Unit 18020104, at northeast end of Jimeno Land Grant, on right bank, 60 ft downstream from bridge on River Road in Colusa, and at mile 89.4 upstream from Sacramento.
DRAINAGE AREA - 12,090 mi².
REVISIONS HISTORY - WSP 1345: 1952. WDR CA-77-4: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1921 to current year (prior to October 1940, low-water periods only).
CHEMICAL DATA: Water years 1959-66, 1996-2001.
SPECIFIC CONDUCTANCE: Water years 1995-98.
WATER TEMPERATURE: Water years 1975, 1977-80, 1995-98.
SEDIMENT DATA: Water years 1973-80, 1996-2000.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1.53 ft below NAVD of 1988. Prior to December 1930, water-stage recorder in center fender pier 50 ft upstream from bridge at same datum.
REMARKS - Natural flow of stream affected by storage reservoirs, including Shasta Lake (station 11370000) since 1943, power development, bypassing for flood control, diversions for irrigation, and return flow from irrigated areas. When discharge exceeds about 30,000 ft³/s, flow begins over Colusa Weir, 2.5 mi upstream on left bank, into Butte Sink and Sutter Bypass. See schematic diagram of lower Sacramento River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge (since water year 1941), 51,800 ft³/s, Mar. 4, 1983, gage height, 68.50 ft, maximum gage height, 69.20 ft, Feb. 18, 1942; minimum recorded, 820 ft³/s, July 25, 26, 1931, gage height, 34.79 ft.
