The park is located 6 miles northeast of Gillham via County Road, close to dam. Located on the Cossatot River, a wild and scenic stream attracts the most adventurous recreationalist.
Visitors enjoy camping, hunting, fishing, canoeing and water recreation.
This park has a boat ramp, picnic shelter, swimming area, playground and an amphitheater. Cossatot Reefs has a spilt recreation season that offers different amenities to fit the needs of campers during the two seasons. From March 1-Oct. 31, the park is a Class A park with flush toilets, showers, trailer dump station, designated ten and trailer sites, trash containers and drinking water. From Nov. 1-Feb.