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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
11530000 Trinity River at Hoopa, CA
LOCATION - Lat 41°03'00", long 123°40'21" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.25, T.8 N., R.4 E., Humboldt County, CA, Hydrologic Unit 18010211, Humboldt meridian, in Hoopa Valley Indian Reservation, on left bank, 0.3 mi upstream from Supply Creek, 0.5 mi downstream from Hospital Creek, in the town of Hoopa.
DRAINAGE AREA - 2,853 mi².
REVISIONS HISTORY - WSP 1565: 1913. WDR CA-77-2: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1911 to January 1914, October 1916 to September 1918, October 1931 to current year. Monthly discharge only for some periods, published in WSP 1315-B. Published as "near Hoopa" 1931-60.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 274.82 ft above NGVD of 1929 and 278.69 ft above NAVD of 1988. Prior to October 1931, nonrecording gage at site 0.4 mi upstream at different datum. October 1931 to Dec. 22, 1964, water-stage recorder at site 2.5 mi upstream at datum 31.67 ft higher.
REMARKS - Flow regulated since November 1960 by Trinity Lake (station 11525400) 84 mi upstream, and by transbasin diversion to Judge Francis Carr Powerplant (station 11525430) since April 1963. Small 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, 231,000 ft³/s, Dec. 22, 1964, gage height, 57.0 ft, present site and datum, from floodmarks, from rating curve extended above 123,000 ft³/s; minimum daily, 162 ft³/s, Oct. 4, 1931.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
DISCRETE WATER-QUALITY DATA:
CHEMICAL ANALYSES: Water years 1951-81, June 2002 to September 2002 (seasonal only).
SEDIMENT DATA: Water years 1955-1979.
CONTINUOUS WATER-QUALITY DATA:
DISSOLVED OXYGEN: Water years June 2002 to October 2002 (seasonal records only).
pH: Water years June 2002 to October 2002 (seasonal records only).
SPECIFIC CONDUCTANCE: Water years June 2002 to October 2002 (seasonal records only).
WATER TEMPERATURE: Water years November 1956 to September 1983, July 1998 to current year.
SEDIMENT DATA: Water years November 1956 to September 1979.
