At 107 feet (33 m), Grays Harbor Lighthouse, dedicated in 1898, is the tallest lighthouse in Washington and the third tallest on the West Coast. It marks the entrance to Grays Harbor, which is one of Washington's few outer-coast harbors. The base of the lighthouse rests on a 12-foot (3.7 m)-thick foundation of sandstone. The lighthouse walls, which are four feet thick at the base, are made of brick with a coating of cement on the exterior. There are 135 metal stairs bolted to the wall lead to the lantern room.