Siuslaw River

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Coordinates: 44°01′01″N 124°08′14″W / 44.01694°N 124.13722°W / 44.01694; -124.13722
Siuslaw River
Siuslaw River at Mapleton.jpg
Siuslaw River at Mapleton
Name origin: From a Yakonan name for a locality, tribe or chief[1]
Country United States
State Oregon
County Lane
Source Central Oregon Coast Range
 - location about 10 miles (16 km) west of Cottage Grove
 - coordinates 43°49′23″N 123°15′42″W / 43.82306°N 123.26167°W / 43.82306; -123.26167 [2]
Mouth Pacific Ocean
 - location Florence
 - elevation 0 ft (0 m) [2]
 - coordinates 44°01′01″N 124°08′14″W / 44.01694°N 124.13722°W / 44.01694; -124.13722 [2]
Length 110 mi (177 km) [3]
Basin 773 sq mi (2,002 km2) [4]
Discharge for near Mapleton, 23.7 miles (38.1 km) from the mouth
 - average 1,974 cu ft/s (56 m3/s) [5]
 - max 49,400 cu ft/s (1,399 m3/s)
 - min 45 cu ft/s (1 m3/s)
Location of the mouth of the Siuslaw River in Oregon
Wikimedia Commons: Siuslaw River

The Siuslaw River (/sˈjuːslɔː/ sy-YEW-slaw) is a river, approximately 110 mi (177 km) long, along the Pacific coast of Oregon in the United States.[3] It drains an area of approximately 773 square miles (2,000 km2) in the Central Oregon Coast Range southwest of the Willamette Valley and north of the watershed of the Umpqua River.[4]

It rises in the mountains of southwestern Lane County, about 10 miles (16 km) west of Cottage Grove.[6] It flows generally west-northwest through the mountains, past Swisshome, entering the Pacific at Florence.[6] The head of tide is 26 miles (42 km) upstream.[7]

The valley of the river has been historically one of the productive timber regions in Oregon. The lower course of the river passes through Siuslaw National Forest.

The Coos Bay branch of the Central Oregon and Pacific Railroad crosses many bridges as it follows the narrow, winding valley of the Siuslaw River to the swing bridge at Cushman.

The river has historically been a spawning ground for Chinook and Coho salmon. Although the Chinook population is substantial, Coho numbers have declined from an annual average of 209,000 fish between 1889 and 1896 to just over 3,000 fish between 1990 and 1995.[8] The estuary of the river is surrounded by extensive wetlands that are a significant habitat for migratory birds along the coast.[9] It is one of the very few Western Oregon rivers where all major forks are undammed.[8]

See also[edit]


  1. ^ McArthur, Lewis A.; Lewis L. McArthur (2003) [1928]. Oregon Geographic Names (7th ed.). Portland, Oregon: Oregon Historical Society Press. p. 883. ISBN 0-87595-277-1. 
  2. ^ a b c "Siuslaw River". Geographic Names Information System. United States Geological Survey (USGS). November 28, 1980. Retrieved August 16, 2010. 
  3. ^ a b United States Geological Survey (USGS). "United States Geological Survey Topographic Map". TopoQuest. Retrieved August 17, 2010.  Map quadrangles show river mileage from mouth to source.
  4. ^ a b Ame, John (2007). "Siuslaw Watershed". Oregon State University. Retrieved October 17, 2010. 
  5. ^ "Water-Data Report 2010: 14307620 Siuslaw River near Mapleton, OR" (PDF). United States Geological Survey. Retrieved October 19, 2011. 
  6. ^ a b Oregon Atlas & Gazetteer. Freeport, Maine: DeLorme Mapping. 1991. pp. 32, 40–41, 46. ISBN 0-89933-235-8. 
  7. ^ "Maintenance Dredging for the Siuslaw River Coastal Navigation Project (Draft Environmental Assessment)" (PDF). U.S. Army Corps of Engineers. April 2010. p. 9. Retrieved October 19, 2011. 
  8. ^ a b "A Watershed Assessment for the Siuslaw Basin". Ecotrust. 2002. Retrieved October 19, 2011. 
  9. ^ "Bringing Back the Tides to Estuary Wetlands". Currents (McKenzie River Trust) (Winter/Spring): 1. 2011. Retrieved October 19, 2011. 

External links[edit]