}} Copalis Beach State Airport is the only airport in the United States that is located on an ocean beach. This airport is located on the beach near Copalis Beach, Washington, elevation 1. It is only available during low tide. The runway is the 4500 foot stretch of ocean beach from the Copalis River on the south to the rocks a mile north. The clam digging is excellent, and resting or watching the great Pacific Ocean from here is fantastic. You can surf, fish, hunt for glass fishing balls, or find interesting pieces of driftwood. No camping is allowed at the airport. Since the runway is the beach itself, there are some things to watch out for. First, land only on the damp sand; the dry sand is very, very soft and dangerous. The airport is generally unusable at high tide since the runway is under water. The available parking area will also be under water, so remaining overnight can cause definite problems to an aircraft. Usage