USGS Water-Year Summary for Site 11370500

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

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USGS Water-Year Summary 2023

11370500 Sacramento River at Keswick, CA

LOCATION - Lat 40°36'04", long 122°26'36" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 sec.28, T.32 N., R.5 W., Shasta County, CA, Hydrologic Unit 18020154, on right bank, 0.4 mi upstream from Middle Creek, 0.8 mi downstream from Keswick Dam, 1.6 mi downstream from Keswick, and 10 mi downstream from Shasta Dam.

DRAINAGE AREA - 6,468 mi². excluding Goose Lake Basin.

REVISIONS HISTORY - WSP 1931: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1938 to current year. Monthly discharge only for some periods, published in WSP 1315-A. CHEMICAL DATA: Water years 1951-94. Published as "near Keswick" in 1951 and 1953, and as "at Keswick Dam, near Keswick" in 1968-69. BIOLOGICAL DATA: Water years 1979-81. SPECIFIC CONDUCTANCE: Water years 1978-94. WATER TEMPERATURE: Water years 1978-94. SEDIMENT DATA: Water years 1978-94.

GAGE - Water-stage recorder. Datum of gage is 479.81 ft above NGVD of 1929 and 482.83 ft above NAVD of 1988. Prior to Oct. 1, 1939, at site 1.5 mi upstream at datum 20.2 ft higher and Oct. 1, 1939, to Apr. 30, 1942, at site 1.5 mi upstream at datum 15.2 ft higher. Aug. 20, 1960, to July 3, 1973, auxiliary water-stage recorder at city of Redding pumping plant 2.1 mi downstream.

REMARKS - Flow completely regulated by Shasta Lake (station 11370000) beginning Dec. 30, 1943. Minor regulation by Keswick Reservoir since 1950, total capacity, 23,800 acre-ft, operational capacity, 4,170 acre-ft, between normal operating elevations of 579.0 ft and 586.0 ft. No diversion between Shasta Dam and station at Keswick. Since December 1963, water is released from Whiskeytown Lake (station 11371700), through a tunnel to Spring Creek Powerplant (station 11371600), and then into Keswick Reservoir. See schematic diagrams of upper Sacramento River Basin, and Pit River and McCloud River Basins available from the California Water Science Center.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 186,000 ft³/s, Feb. 23, 1940, gage height, 47.2 ft, site and datum then in use, from rating curve extended above 75,000 ft³/s, on basis of peak discharge at Kennet, plus 4,000 ft³/s estimated inflow; minimum observed, 2,730 ft³/s, Aug. 22, 1939. Since regulation by Shasta Dam in 1943, maximum discharge, 83,000 ft³/s, Feb. 14, 2017, gage height, 33.28 ft; minimum daily, 2,360 ft³/s, Mar. 15, 1950.