[3][4] 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.

[4] Copalis State Airport covers an area of 16 acres (6 ha) at an elevation of 1 feet (0.3 m) above mean sea level.

[1] The runway is a stretch of ocean beach from the Copalis River on the south to the rocks a mile north.

Due to river migration and beach erosion, the runway length has been reduced by approximately 1,100 feet (335 m).

[4] For the 12-month period ending May 31, 2011, the airport had 200 general aviation aircraft operations, an average of 16 per month.