Spencer Island Restoration Project

Spencer Island is located in the Snohomish River estuary east of the City of Everett. The island is a flat, tidal wetland complex ringed with an old dike with several openings and bridges that serve as a trail. Steamboat Slough borders the property to the east and Union Slough borders the property to the west. Washington Department of Fish and Wildlife (WDFW) and Snohomish County purchased the property in 1989 under a joint acquisition and co-management agreement, with WDFW owning 174 acres on the north end and Snohomish County owning 240 acres on the south end of the island.

The WDFW portion of the island is managed as the Spencer Island Unit of Snoqualmie Wildlife Area.

In the early 1900s, the site was diked and developed for grazing and agriculture, resulting in the loss of tidally influenced wetlands and channels. In 1994, Snohomish County completed a restoration project that involved removing sections of dike that allowed tidal water and fish into the southern portion of the property.  In 2005, the dike failed on the northern WDFW portion of the site that allowed tides and fish into the entirety of the site. Although the entire site is now tidally inundated, remnant dikes and ditches still occur on the island that reduce habitat benefits for salmon and other species that rely on tidal wetlands.

WDFW is wrapping up 35% design of the Spencer Island Restoration Project and will be starting final design and implementation in spring 2025.