Copalis State Airport is a state owned, public use airport in Grays Harbor County, Washington, United States. Formerly known as Copalis Beach State Airport, it is located near Copalis Beach, Washington. The airstrip is located on an ocean beach near the mouth of the Copalis River, in the North Beach Seashore Conservation Area, adjacent to the Olympic Coast National Marine Sanctuary. It is the only airport in Washington State where landing on the beach is legal. Facilities and aircraft Copalis State Airport covers an area of 16 acres (6 ha) at an elevation of 1 feet (0.3 m) above mean sea level. It has one runway designated 14/32 with a sand surface measuring 4,500 by 150 feet (1,372 x 46 m). The runway is a stretch of ocean beach from the Copalis River on the south to the rocks a mile north. It is only available during low tide. Due to river migration and beach erosion, the runway length has been reduced by approximately . For the 12-month period ending May 31, 2011, the airport had 200 general aviation aircraft operations, an average of 16 per month. References External links Airports in Washington (state) Transportation buildings and structures in Grays Harbor County, Washington