Maryhill State Park is a 99-acre camping park with 4,700 feet of waterfront on the Columbia River in Klickitat County. The area is significant for its natural beauty, its access to the surrounding natural wonders and its cultural history. A full-scale model of Stonehenge stands near the park.

Maryhill State Park was acquired by lease from the U.S. Army Corps of Engineers in 1972 at no cost. Sam Hill, considered a local eccentric, built a "castle" for his daughter, Mary, on a hill, and named it "Maryhill." He designated the beautiful building, originally designed as a family home, as an art museum before the end of its construction. Mr. Hill built a full-scale partial replica of England's famous Stonehenge one mile from the state park. He also tried unsuccessfully to establish a Quaker colony in the community in the years preceding World War II. Both Stonehenge and the Maryhill Museum of Art are open to the public.

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 park has 20 standard campsites, 50 full-hookup sites, 2 primitive sites. Maximum site length is 60 feet may have limited availability. There are three restrooms, one ADA, and 6 showers, two ADA. There is one RV dump station.