Posey Island Marine 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.
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.
Orca whales are often seen in the waters near this island. There are no mooring buoys or docks. This is primarily a kayaking site. The site is heavily used by commercial kayak tours as a rest stop during whale watching tours in nearby waters.
Posey Island has two campsites that are part of the Cascadia Marine Trail. Campsites may be reserved, May 15 - September 30, with 14 days minimum notice. To reserve a campsite, call 360-378-2044 (Lime Kiln Point State Park). We begin accepting reservations on January 2 at 9 AM for each calendar year.
All campsites are for the exclusive use of boaters arriving by human or wind-powered watercraft. Each campsite can accommodate a maximum of eight campers. This maximum number of campers is strictly enforced due to the small size of the island. No exception. Paddlers and sailors must be prepared to seek other campsites if the campsites are at capacity.
Beginning January 1, 2015, the following reservation changes for Posey Island campsites go into effect:
Reservations for Friday or Saturday nights May 15-Sept. 30 are limited to one site and one night per reservation. Reservations are also limited to a total of any five Friday and /or Saturday one-night reservations per month.
Reservations for Sunday - Thursday nights May 15-Sept. 30 are limited to one site and a maximum of two nights per reservation. Reservations are also limited to a total of six one- or two-night weekday reservations per month.
Campsites are available on a first-come, first-served basis May 15-September 30 on nights when they have not been reserved. No reservations are needed Oct. 1- May 14.