Snohomish River

Snohomish River
Snohomish River in Snohomish, Washington
Map of the Snohomish River and tributaries
Mouth of the Snohomish River in Washington Show map of Washington (state) Snohomish River (the United States) Show map of the United States
Location
Country	United States
State	Washington
County	Snohomish
Physical characteristics
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
• coordinates	48°1′16″N 122°12′30″W / 48.02111°N 122.20833°W / 48.02111; -122.20833[1]
• elevation	0 m (0 ft)
Length	20 mi (32 km)[2]
Basin size	1,856 sq mi (4,810 km2)[3]
Discharge
• location	Near Monroe[4]
• average	9,511 cu ft/s (269.3 m3/s)[4]
• minimum	763 cu ft/s (21.6 m3/s)
• maximum	150,000 cu ft/s (4,200 m3/s)

The Snohomish River is a river in Snohomish County, 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.

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).^[5]