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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
11477000 Eel River at Scotia, CA
LOCATION - Lat 40°29'30", long 124°05'55" referenced to North American Datum of 1927, in SW 1/4 sec.05, T.1 N., R.1 E., Humboldt County, CA, Hydrologic Unit 18010105, in Humboldt meridian, near center of span in left pier of Eagle Prairie Bridge (formerly A.S. Murphy Memorial Bridge) on State Highway 283, 0.5 mi north of Scotia, and 6 mi upstream from Van Duzen River.
DRAINAGE AREA - 3,113 mi².
REVISIONS HISTORY - WSP 931: 1938. WSP 1315-B: 1914-15 (instantaneous maximum discharge), 1917 (instantaneous maximum discharge), 1927-28 (instantaneous maximum discharge), 1936 (instantaneous maximum discharge), 1939 (instantaneous maximum discharge). WSP 1345: Drainage area. WSP 1715: 1959.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1910 to current year. Monthly discharge only for some periods and yearly estimates for 1915-16, published in WSP 1315-B.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 35.50 ft above NGVD of 1929 and 38.41 ft above NAVD of 1988. Prior to Dec. 12, 1940, nonrecording gage at same site and datum.
REMARKS - Low flow slightly regulated by Lake Pillsbury (station 11470000) 138 mi upstream since December 1921 and by diversion through Potter Valley Powerhouse Intake (station 11471000). See schematic diagram of Eel River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 752,000 ft³/s, Dec. 23, 1964, gage height, 72.0 ft, from floodmarks, from rating curve extended above 220,000 ft³/s, on basis of maximum flow at upstream stations; minimum observed, 12 ft³/s, Aug. 12-14, 1924.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 1952-75, 1977, 1979-95.
BIOLOGICAL DATA: Water years 1979-81.
SEDIMENT DATA: Water years 1955-95, 1998.
CONTINUOUS WATER-QUALITY DATA:
SPECIFIC CONDUCTANCE: Water years 1979-81.
WATER TEMPERATURE: Water years 1958-82.
SEDIMENT DATA: Water years 1960-80.
