The Sultan River originates at Crested Buttes. It flows northwest, then southwest into Spada Lake. Spada Lake, held back by the
Culmback Dam, is the main source of drinking water for people in
Everett. The South Fork Sultan River joins the main river by flowing into a large arm of the lake’s south shore. The Sultan River exits the lake and flows west, then south to its confluence with the Skykomish River. The river’s largest tributaries are Elk Creek, which joins just above where the river flows into Spada Lake, and Williamson Creek, which flows from remote Copper Lake and enters the lake just below where the river enters it. ==South Fork==