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USGS Water-Year Summary 2024
11517500 Shasta River near Yreka, CA
LOCATION - Lat 41°49'23", long 122°35'40" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.24, T.46 N., R.7 W., Siskiyou County, CA, Hydrologic Unit 18010207, on right bank, 0.5 mi upstream from mouth, 7 mi north of Yreka, and 24 mi downstream from Lake Shastina.
DRAINAGE AREA - 793 mi².
REVISIONS HISTORY - WSP 1929: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1933 to December 1941, December 1944 to current year.
CHEMICAL DATA: Water years 1959-79, 2002-03 (seasonal records only).
DISSOLVED OXYGEN: Water years 2002-04 (seasonal records only).
pH: Water years 2002-04 (seasonal records only).
SPECIFIC CONDUCTANCE: Water years 2002-04 (seasonal records only).
WATER TEMPERATURE: Water years 1965-79, 2002-04 (seasonal records only).
SEDIMENT DATA: Water years 1955-56, 1958-62.
CHEMICAL DATA: Water years 1959-79, 2002-03 (seasonal records only).
DISSOLVED OXYGEN: Water years 2002-04 (seasonal records only).
pH: Water years 2002-04 (seasonal records only).
SPECIFIC CONDUCTANCE: Water years 2002-04 (seasonal records only).
WATER TEMPERATURE: Water years 1965-79, 2002-04 (seasonal records only).
SEDIMENT DATA: Water years 1955-56, 1958-62.
GAGE - Water-stage recorder, crest-stage gage, and concrete control. Datum of gage is 2036.93 ft above NAVD of 1988. Prior to Nov. 2, 1933, nonrecording gage at same site and datum.
REMARKS - Low flow completely regulated by Lake Shastina (formerly Lake Dwinnell) beginning in 1928; storage limited to 50,000 acre-ft. Small powerplant, 5.6 mi upstream, has operated intermittently since summer of 1987. Many diversions upstream from station for irrigation. See schematic diagram of Klamath River and Trinity River Basins available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 21,500 ft³/s, Dec. 22, 1964, gage height, 12.92 ft, in gage well, 13.85 ft, from floodmarks, from rating curve extended above 4,100 ft³/s, on basis of slope-area measurement of peak flow; minimum daily, 1.5 ft³/s, Aug. 24, 1981, July 17, 1985.
