Snohomish River

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Coordinates: 48°1′16″N 122°12′30″W / 48.02111°N 122.20833°W / 48.02111; -122.20833
Snohomish River
River seen from downtown Snohomish.jpg
Snohomish River at Snohomish
Country United States
State Washington
Source Confluence of the Skykomish River and the Snoqualmie River
 - location Monroe
 - coordinates 47°49′48″N 122°2′47″W / 47.83000°N 122.04639°W / 47.83000; -122.04639 [1]
Mouth Puget Sound
 - location Port Gardner
 - elevation 0 m (0 ft)
 - coordinates 48°1′16″N 122°12′30″W / 48.02111°N 122.20833°W / 48.02111; -122.20833 [1]
Length 20 mi (32 km) [2]
Basin 1,856 sq mi (4,807 km2) [3]
Discharge for Near Monroe
 - average 9,511 cu ft/s (269 m3/s) [4]
 - max 150,000 cu ft/s (4,248 m3/s)
 - min 763 cu ft/s (22 m3/s)
Map of the Snohomish River and tributaries
Mouth of the Snohomish River in Washington

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.

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 ft³/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).[5]

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