Washington Department of Fish and Wildlife (WDFW), in partnership with the U.S. Army Corps of Engineers (USACE), seeks to fully restore estuarine habitat located on Spencer Island--a tidally influenced tidal marsh island located in the Snohomish delta. Specific process-based restoration objectives to be achieved with project construction include: (1) tidal channel formation and maintenance; (2) tidal flow; (3) distributary channel migration; (4) erosion and accretion of sediments; and (5) exchange of aquatic organisms. The primary habitat to be restored is tidally-influenced estuary marsh that will support all juvenile salmonids, primarily ESA listed Chinook salmon.