USGS Water-Year Summary 2018
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.
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.
REVISED RECORDS - WSP 1929: Drainage area.
GAGE - Water-stage recorder, crest-stage gage, and concrete control. Elevation of gage is 2,000 ft above NGVD of 1929, from topographic map. Prior to Nov. 2, 1933, nonrecording gage at same site and datum.
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.