An 11.5-acre marine park with 1,661 feet of saltwater shoreline located just to the east of Harstine Island. It is situated in the beautiful South Puget Sound and features a pristine cove to set anchor. Visitors can enjoy the many hiking trails, viewing an active bald eagle nest and shellfish harvesting. The shellfish population is abundant and open to shellfish harvesters year round.
McMicken Island Marine State Park is a public recreation area in Case Inlet on the east flank of Harstine Island, South Puget Sound, Mason County, Washington. The state park's 222 acres (90 ha) include 11.5 acres (4.7 ha) of forested McMicken Island and 1,661 feet (506 m) of saltwater shoreline with a sheltered cove. A tombolo connects McMicken Island to Harstine Island at low tide. Park activities include hiking, boating, and harvesting shellfish. The park is administered as a satellite of Jarrell Cove State Park. It bears the name of William C. McMicken, who was Washington Surveyor General from 1873 to 1886.
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Harstine Island State Park is a day use park with beach access via a half-mile trail. It is a two mile drive from Jarrell Cove.