Potholes State Park is a public recreation area on the southern shore of Potholes Reservoir, located 13 mi south of Moses Lake and 13 mi northwest of Othello in Grant County, Washington. The state park was created following the completion of the O'Sullivan Dam in 1949. The park's 773 acre include 6000 ft of shoreline and facilities for camping, hiking, boating, swimming, fishing, and other water activities.