Sauk River

The Sauk River is a tributary of the Skagit River, approximately 45 miles long, in northwestern Washington in the United States. It drains an area of the high Cascade Range in the watershed of Puget Sound north of Seattle. The river is a popular destination for fly fishing.

Its two forks rise in the Cascades in eastern Snohomish County, in the Glacier Peak Wilderness and join to form the mainstem Sauk River at Bedal. From there the river flows northwest from there through a remote section of the Mount Baker-Snoqualmie National Forest to Darrington, then north to join the Skagit River from the south at Rockport.
The name "Sauk" comes from the Sah-kee-ma-hu (Sauk-Suiattle tribe), a group related to the Skagit tribes, not from the Sauk tribe of the Midwestern U.S.