USGS Water-Year Summary 2019
11469000 Mattole River near Petrolia, CA
LOCATION - Lat 40°18'48", long 124°16'56" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.10, T.2 S., R.2 W., Humboldt County, CA, Hydrologic Unit 18010107, in Humboldt meridian, on downstream side of bridge, on left bank, 0.2 mi downstream from Mill Creek, 0.5 mi southeast from Petrolia Post Office, 0.6 mi upstream from North Fork, 0.8 mi south of Petrolia, and 20.6 mi south of town of Fernbridge.
DRAINAGE AREA - 245 mi².
- WSP 1285: 1912-13. WSP 1929: Drainage area.
PERIOD OF RECORD - October 1911 to December 1913, October 1950 to current year. Monthly discharge only for some periods, published in WSP 1315-B.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 49.41 ft above NGVD of 1929. November 1911 to December 1913, nonrecording gages at several sites within 0.3 mi upstream at various datums. Dec. 11, 1950, to July 14, 1955, at site 0.3 mi upstream at datum 7.48 ft higher. July 15, 1955, to Oct. 26, 1967, at site 0.4 mi downstream at different datum. Oct. 27, 1967, to Oct. 30, 1996, at site 1.1 mi upstream at datum 7.00 ft higher.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 90,400 ft³/s, Dec. 22, 1955, gage height, 36.60 ft, site and datum then in use, from rating curve extended above 26,000 ft³/s, on basis of slope-area measurement of peak flow; minimum daily, 11 ft³/s, Sept. 5-13 2008.
PERIOD OF RECORD
DISCRETE WATER-QUALITY DATA:
CHEMICAL ANALYSES: Water years 1959-79.
CONTINUOUS WATER-QUALITY DATA:
SEDIMENT DATA: Water years 2001-03 (storm season only).
WATER TEMPERATURE: Water years 1966-78, 2001-03 (storm season only).