The Siuslaw River (pronounced sigh-YOU-slaw) is a river, approximately 110 miles long, along the Pacific coast of Oregon in the United States. It drains an area of approximately 4500 sq. miles in the Central Oregon Coast Range southwest of the Willamette Valley and is a popular river for anglers. The tidal ebbs and flows have created an ideal habitat for fish. Locals claim Fall and Winter are the opportune times.
The headwaters of the Siuslaw mainstem, approximately 5 miles west of Cottage Grove, and Lake Creek both head in the Willamette Valley in the rain shadow of the OR Coast Range. It flows generally WNW through the mountains, past the small town Swisshome, entering the Pacific at Florence, OR. The valley of the river has been historically one of the productive timber regions in Oregon. The lower course of the river passes through Siuslaw National Forest.