Mattole River

The Mattole River is a river on the north coast of California, that flows northerly, then westerly into the Pacific Ocean. The vast majority of its 62 miles (100 km) course is through southern Humboldt County, though a short section of the river flows through northern Mendocino County. Communities, from north to south, closely associated with the Mattole River include: Petrolia, Honeydew, Ettersburg, Thorn Junction, and Whitethorn. The river enters the ocean at the Mattole Estuary about 4 miles (6.4 km) west-southwest of Petrolia and 10 miles (16 km) south of Cape Mendocino.

Mattole River
Mattole River Estuary
Location of the mouth of Mattole River in California
Native nameMattóal (Mattole)
Location
CountryUnited States
StateCalifornia
RegionMendocino County, Humboldt County
CitiesPetrolia, Whitethorn, Honeydew
Physical characteristics
SourceKing Range
  location11 mi (18 km) southwest of Redway, California
  coordinates39°59′7″N 123°58′19″W
  elevation1,780 ft (540 m)
MouthPacific Ocean
  location
4 mi (6 km) west of Petrolia, California
  coordinates
40°18′8″N 124°21′14″W
  elevation
0 ft (0 m)
Length62 mi (100 km)
Basin size304 sq mi (790 km2)
Discharge 
  locationPetrolia
  average1,288 cu ft/s (36.5 m3/s)
  minimum11 cu ft/s (0.31 m3/s)
  maximum90,400 cu ft/s (2,560 m3/s)
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