Located in San Juan County.
N 48.40' 32" W 123.11' 56"
The park is reachable only by boat. The nearest access is four miles southeast at Roche Harbor Resort on San Juan Island. The entrance to Reid Harbor is partially blocked by two small islands. Boaters should keep these islands to their starboard when entering the harbor.
The entrance to Prevost Harbor is gained by passing around either end of Satellite Island.
Unless you are arriving by kayak, do not attempt to enter the harbor at the east end. This entrance is full of rocks and reefs. The only safe entrance is at the west end of Satellite Island. Stay in the middle of the channel and harbor until you are adjacent to the park dock. Consult your charts before you arrive. Once inside Prevost Harbor there are plenty of deep water anchorages available if the park buoys and dock are full.
List of all downloadable Washington State Park maps