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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
11390500 Sacramento River below Wilkins Slough, near Grimes, CA
LOCATION - Lat 39°00'36", long 121°49'25" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 sec.02, T.13 N., R.1 E., Colusa County, CA, Hydrologic Unit 18020104, on right bank, 1,200 ft downstream from Wilkins Slough, 5.8 mi southeast of Grimes, and at mile 62.9 upstream from Sacramento.
DRAINAGE AREA - 12,915 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1931 to current year (prior to October 1938, low-water periods only). Monthly discharge only for some periods, published in WSP 1315-A. Prior to October 1965, published as "below Wilkins Slough."
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1.28 ft below NAVD of 1988. Datum is subject to change due to subsidence.
REMARKS - Natural flow of stream affected by storage reservoirs, power development, bypassing for flood control, diversions for irrigation, and return flow from irrigated areas. When discharge exceeds about 23,000 ft³/s, flow begins over Tisdale Weir, 1.0 mi upstream on left bank, into Sutter Bypass. Records tabulated below do not include flow over Tisdale Weir. 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 1939), 32,700 ft³/s, Feb. 20, 1986, gage height, 52.50 ft, maximum gage height, 52.75 ft, Mar. 1, 1940; minimum daily, 645 ft³/s, Aug. 9, 1939.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years October 1966 to current year (water years 1967-2023, daily).
INSTRUMENTATION - Water-temperature recorder since October 1966. Temperature recorder located at gaging station on right bank.
REMARKS - Water temperature is affected by regulation from dams upstream. Interruption in record due to malfunction of the recording instrument.
