near Tidewater, Oregon, 21 miles (34 km) from mouth[6][7]
• average
1,459 cu ft/s (41.3 m3/s)[6][7]
• minimum
45 cu ft/s (1.3 m3/s)
• maximum
41,800 cu ft/s (1,180 m3/s)
The Alsea River flows 48.5 miles (78.1 km) from Alsea, an unincorporated community in the coastal mountains of the U.S. state of Oregon, to the Pacific Ocean near the city of Waldport. It begins at the confluence of the North Fork Alsea River and the South Fork Alsea River and ends in Alsea Bay, a wide estuary at Waldport.[4] The river flows generally west-northwest in a winding course through the mountains of southern Benton and Lincoln counties, passing near the unincorporated community of Tidewater and through the Siuslaw National Forest. Its drainage basin extends into Lane County, along the headwaters of the South Fork Alsea River.
The Alsea River supports runs of chinook and coho salmon, as well as steelhead and coastal cutthroat trout. The Alsea River Fish Hatchery is along one of its tributaries, the North Fork Alsea River.
^ abc"Alsea River". Geographic Names Information System (GNIS). United States Geological Survey (USGS). November 28, 1980. Retrieved July 31, 2008.
^Bright, William (2004). Native American Placenames of the United States. Norman, Oklahoma: University of Oklahoma Press. p. 34. ISBN 0-8061-3576-X.
^Source elevation derived from Google Earth search using GNIS source coordinates.
^ ab"United States Geological Survey Topographic Map, Alsea, Oregon quadrant". TopoQuest. Retrieved August 9, 2010. The map quadrants include river mile (RM) markers for the river's entire length.
^"Alsea River". MidCoast Watersheds Council. 2006. Archived from the original on May 7, 2008. Retrieved August 9, 2010.
^ ab"Water-Data Report 2013: 14306500 Alsea River near Tidewater, OR" (PDF). United States Geological Survey (USGS). 2014. Retrieved November 16, 2014.
^ abThe average is from annual discharge rates from water year 1940 to water year 2013.
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