Posey Island State Park, Marine state park in San Juan County, United States
Posey Island spans one acre of land with 1,000 feet of saltwater shoreline, located a quarter mile north of Pearl Island near Roche Harbor.
The Washington State Parks and Recreation Commission established this marine park in 1960 through a lease agreement with the U.S. Bureau of Land Management.
The island functions as a strategic point along the Cascadia Marine Trail, supporting regional water-based recreational activities and environmental preservation efforts.
Two primitive campsites on the island remain reserved exclusively for visitors arriving by non-motorized watercraft, with access to one composting toilet facility.
The island rises 13 feet above sea level and provides opportunities to observe porpoises and marine life while maintaining strict environmental protection measures.
Location: San Juan County
Website: https://parks.wa.gov/567/Posey-Island
GPS coordinates: 48.61843,-123.16769
Latest update: March 24, 2025 17:00
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