Decatur Island is in the San Juan Islands of Washington State.
Decatur Island is located just east of Lopez Island across Lopez Sound and just south of Blakely Island across Thatcher Pass. Named by the Wilkes Expedition in 1841 for naval officer Stephen Decatur, it is 3.524 square miles (9.127 km²) in area.
There are no public facilities other than one public boat ramp on the north side of the island.
There is no Washington State Ferries service to Decatur; access is by private boat or plane. The airport on Decatur Island is private, for residents of the Decatur Shores community only. All other persons wishing to use the airport must obtain prior permission from the community.
By water taxi
- James Island State Park. is just to the east of the island this 113-acre marine camping and moorage park with 12,335 feet of saltwater shoreline on Rosario Strait. The park features a beautiful western view of the San Juan islands from a high bluff along the loop trail. The Wilkes Expedition named the island in 1841 to honor the earlier heroism of an American sailor, Reuben James. The federal government acquired the island and transferred it to the Washington State Parks and Recreation Commission in 1964. James Island has 13 campsites at three locations on the island. The Water Trail Site is on a hill above a pocket cove of the West Cove and has three campsites (sites 11-13) and a pit toilet. These campsites are part of the Cascadia Marine Trail and are strictly reserved for use by boats arriving by human- or wind-powered watercraft. The Saddle Area spans from the West Cove shoreline across the island to the East Cove. There are six campsites (sites 5-10), a picnic shelter and two picnic sites, composting toilet facilities, pay station and moorage dock. A trail leads to the East Cove where there are four offshore mooring buoys. The loop trail system starts and ends here. The bottom structure at the West Cove is rocky and steeply sloped. It is not a good anchorage site. The East Cove campground is a short walk from the Saddle area and has four campsites (sites 1-4), one pit toilet, bulletin board and pay station. From here, the loop trail leads southwest to the Water Trail campsites on the southwest side of the West Cove. Boaters moored in the East Cove are exposed to wakes from boat traffic in Rosario Strait. -There is no potable water on the island and no garbage service. Visitors need to pack-out what they pack-in. Boats may not use dinghies to reserve moorage space on the dock or buoys. Campers and boaters must self register and pay fees at the bulletin board/pay station.
- Decatur has a nine hole rustic golf course. The golf course is private but welcomes all players, furnishing clubs and balls for your use. A donation is suggested to help defray operating costs.
- Decatur Island Farmers Market. From Memorial Day to Labor Day there is a Farmer's Market each Saturday on the school grounds.