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Heyburn State Park is a public recreation area in the U.S. state of Idaho. It is located almost entirely in Benewah County, with a small portion extending into southern Kootenai County. The park was founded in 1908 and is the oldest state or provincial park in the Pacific Northwest. The park has 5,744 acres (2,325 ha) of land and 2,332 acres (944 ha) of water on three lakes: Benewah, Chatcolet, and Hidden. A dam constructed on the Spokane River in Post Falls in 1906 raised the level of Lake Coeur d'Alene, connecting it to the park's three lakes. The surface elevation of the lakes is 2,125 feet (648 m) above sea level. The park's year-round recreational opportunities include camping, boating, hiking, horseback riding, fishing, and picnicking.