Lake Fort Smith State Park is a 260-acre Arkansas state park in Crawford County, Arkansas in the United States. Originally a Fort Smith city park in the 1930s and later the Works Progress Administration-built Mountainburg Recreational Facility, the lake nestled in the Boston Mountains was adopted into the state park system by the Arkansas Department of Parks and Tourism in 1967. Lake Fort Smith State Park was closed in 2002 to make way for a larger dam and spillway.