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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
11372000 Clear Creek near Igo, CA
LOCATION - Lat 40°30'48", long 122°31'23" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.27, T.31 N., R.6 W., Shasta County, CA, Hydrologic Unit 18020154, on left bank, at old highway bridge on Redding-Igo Road, 0.3 mi downstream from South Fork Clear Creek, 1.0 mi northeast of Igo, 7.0 mi downstream from Whiskeytown Dam, 8.3 mi southwest of Redding, and 10.4 mi upstream from mouth.
DRAINAGE AREA - 228 mi².
REVISIONS HISTORY - WSP 1345: Drainage area. WSP 1395: 1941 (instantaneous maximum discharge). WRD CA-03-04: 1983 (peaks above base).
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1940 to current year.
CHEMICAL DATA: Water years 1958-79.
WATER TEMPERATURE: Water years 1965-79.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 672.99 ft above NGVD of 1929 and 675.79 ft above NAVD of 1988.
REMARKS - Low flow completely regulated by Whiskeytown Lake (station 11371700) since May 1963. Transbasin diversion from Trinity River through Judge Francis Carr Powerplant (station 11525430) to Whiskeytown Lake began in April 1963. Diversions from Whiskeytown Lake to Spring Creek Powerplant (station 11371600) began in December 1963. See schematic diagrams of the upper Sacramento River Basin, Pit River and McCloud River Basins, and Klamath River and Trinity River Basins available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 24,500 ft³/s, Dec. 21, 1955, gage height, 13.75 ft; minimum daily, 9.0 ft³/s, Sept. 4-7, 1950.
Since completion of Whiskeytown Dam in 1963, maximum discharge, 18,400 ft³/s, Mar. 3, 1983, gage height, 12.73 ft, from rating curve extended above 12,000 ft³/s, on basis of slope-area measurement of peak flow; minimum daily, 30 ft³/s, Oct. 10, 11, 1977.
