Fort Casey

Fort Casey is a former military installation and state park on Whidbey Island in Washington, covering about 190 hectares with over three kilometers of shoreline along Puget Sound and Admiralty Inlet. The site includes concrete batteries, underground passages, a restored lighthouse, and open grass areas overlooking the waterway.

The fort was built in the 1890s as part of a defensive triangle with two other installations to guard Puget Sound against enemy ships. The army used the fortification until the end of World War Two, then moved the defense line farther outward.

The name Casey honors Thomas Lincoln Casey, a US Army engineer from the late 19th century. Visitors today see massive concrete bunkers and gun emplacements set into the coastal landscape, surrounded by grassy fields.

The park requires a ten-dollar day pass or a valid Discover Pass for entry. Walking trails lead through the grounds, and the shoreline is suitable for diving and beach activities.

Two original coastal guns remain on the grounds, though the fort never saw actual enemy contact. The cannons were brought back from the Philippines after World War Two and placed here as display pieces.

Location: Island County

GPS coordinates: 48.16444,-122.67806

Latest update: December 20, 2025 15:57