Posey Island State Park

Posey Island State Park is a small, one-acre marine camping park with 1,000-feet of shoreline. It is located a quarter mile north of Pearl Island, near Roche Harbor, San Juan Island. Posey Island is part of the Cascadia Marine Trail. All onshore campsites are for the exclusive use of boaters arriving by human- or wind-powered watercraft.
  1. Activities
  2. Boating
  3. Camping
  4. History

Picnic & Day-Use Facilities
Visitors arriving by vessels with motorboats are not permitted to camp at the park, but may use the island for day-use. There is no potable water or garbage service to the island. Visitors must pack-out what they pack-in. There is one composting toilet.