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The Spencer Island Wildlife Area is a 412-acre island located in Snohomish County in the Snohomish River delta. Washington Department of Fish and Wildlife owns 174 acres at the northern end of the island. Snohomish County purchased the remainder of the island. A memorandum of understanding is being developed between the department and Snohomish County Parks and Recreation Division to co-manage the land.

The island has a dike around the perimeter and drainage ditches in the interior. Evergreen blackberry is growing profusely along the dike. The land is very flat and supports about 50 acres of alder woods, while the rest of the acreage has relatively solid stands of reed canary grass. There are about 23 acres on the northern tip of the island that was only partially diked and is therefore tidally influenced. The outer dike on the southern tip is now breached in three places, creating about 50 additional acres of tidally-influenced wetlands for salmonid rearing. About 150 acres north of the cross levee are flooded. Water levels vary up to three feet deep. This makes it ideal for waterfowl, shorebirds, and a variety of songbirds.

This is a popular spot to view birds and other wildlife. A trail system on the dikes opens up much of the area to foot travel. Access is through the City of Everett's Sewage Treatment Plant on 4th Avenue.