Kopachuck State Park is a 109-acre marine and camping park with 5,600 feet of saltwater shoreline on Henderson Bay. One portion of the park, Cutts Island or Deadman's Island is a half mile from shore and reachable only by boat. The park provides scenic views of sunsets, the Olympic Mountains and Puget Sound. This beautiful park has a western exposure with spectacular sunsets, sandy beaches and a panoramic view of the snow-capped Olympic Mountains. Cutts Island, a portion of the park located half a mile from the park proper, is reachable only by private boat.

The name "Kopachuck" originated from "Chinook Jargon," the trade language of the Pacific Coastal Indians. Kopachuck is a merging of two words: "Kopa" meaning "at," and "chuck" meaning "water." This scenic park was once a seasonal fishing and clamming site of the Puyallup and Nisqually tribes.

Cutts Island, which sets in the water a half mile away from the park proper, is also known as "Deadman's Island." The latter name derives from the belief that the island was used by saltwater tribes who buried their dead in canoes placed in the forks of trees. It is unknown how the island acquired the name "Cutts Island." Prior to its current popular names, the place was called "Crow Island," for the large quantity of crows explorer Peter Puget discovered there in 1792, and later "Scotts Island," in honor of Thomas Scott, quartermaster of the 1841 Wilkes expedition.

A Discover Pass is required for vehicle access to Washington state parks for day use. For more information about the Discover Pass and exemptions, please visit the Discover Pass web page.

The main campground at Kopachuck has been closed since August of 2011 due to tree health issues. It is closed permanently. There are no hiker/bicycle sites available at the park. There is one Cascadia Marine Trail campsite available to campers arriving to the park in wind- and human-powered beachable watercrafts. Coordinates 47.3102 degrees N, 122.6865 degrees W

There is a shelter with two picnic tables and a BBQ grill. There is a grassy area, 17 feet by 17 feet, is suitable for a couple of tents. Water is available at the main day-use restroom. A portable toilet is available from April to September south of the campsite. The campsite is available on a first-come, first-served basis.