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The Snohomish River is a river in the U.S. state of Washington, formed by the confluence of the Skykomish and Snoqualmie rivers near Monroe. It flows northwest entering Port Gardner Bay, part of Puget Sound, between Everett and Marysville. The Pilchuck River is its main tributary and joins the river at Snohomish. The river system drains the west side of the Cascade Mountains from Snoqualmie Pass to north of Stevens Pass.

Snohomish River
River seen from downtown Snohomish.jpg
Snohomish River at Snohomish
Map of the Snohomish River and tributaries
Snohomish River is located in Washington (state)
Snohomish River
Mouth of the Snohomish River in Washington
Snohomish River is located in the United States
Snohomish River
Snohomish River (the United States)
CountryUnited States
Physical characteristics
SourceConfluence of the Skykomish River and the Snoqualmie River
 ⁃ locationMonroe
 ⁃ coordinates47°49′48″N 122°2′47″W / 47.83000°N 122.04639°W / 47.83000; -122.04639[1]
MouthPuget Sound
 ⁃ location
Port Gardner
 ⁃ coordinates
48°1′16″N 122°12′30″W / 48.02111°N 122.20833°W / 48.02111; -122.20833Coordinates: 48°1′16″N 122°12′30″W / 48.02111°N 122.20833°W / 48.02111; -122.20833[1]
 ⁃ elevation
0 m (0 ft)
Length20 mi (32 km)[2]
Basin size1,856 sq mi (4,810 km2)[5]
 ⁃ locationNear Monroe[3]
 ⁃ average9,511 cu ft/s (269.3 m3/s)[4]
 ⁃ minimum763 cu ft/s (21.6 m3/s)
 ⁃ maximum150,000 cu ft/s (4,200 m3/s)
Debris in the November 2006 flood is swept under the Route 9 Bridge.

Measured at Monroe, the Snohomish River has an average annual flow of 9,500 cubic feet per second (270 m3/s).[2] In comparison, the Columbia River, Washington's largest river, has an average flow of about 265,000 cubic feet per second (7,500 m3/s).[6]

See alsoEdit


  1. ^ a b U.S. Geological Survey Geographic Names Information System: Snohomish River
  2. ^ a b Snohomish River Watershed Draft Initial Assessment Archived 2006-10-04 at the Wayback Machine
  3. ^ USGS Snohomish River gauge near Monroe
  4. ^ USGS Snohomish River gauge near Monroe
  5. ^ Surface Water Management Division: Snohomish River Salmon Recovery
  6. ^ Kammerer, J.C. (May 1990). "Largest Rivers in the United States". U.S. Geological Survey. Retrieved 2008-04-01.

External linksEdit