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snohomish river in Lowell Washington
images by: David Tarsi


 The Skagit River 
 The Snohomish River 
 The Snoqualmie River 
 The Nooksack River 
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hydrologic drawing
Image used by permission of Professor Michael Pidwirny(Pidwirny)
Rivers usually get their water from rain, glaciers, melting snow, and surface water (Reflections on Water p5). However it is more complicated than that. For example the Snohomish river has water in it that comes from areas where runoff from rainwater can be influenced by substances from Agricultural/rural residential, Forestry, and even some unknown sources. The Skykomish andSnoqualmie rivers have a similar situation with the added complication of industrial or urbanized areas contributing substances to the river water. (The Trust for Public Land p.72 in the print). The upper Skagit river doesn't have as much industry or urbanization but there is a lot of forestry on its tributaries(The Trust for Public Land p.49 in the print).