Buck Creek State Park is a 4,016-acre (1,625 ha) public recreation area in Clark County, Ohio, in the United States, that is leased by the state of Ohio from the U.S. Army Corps of Engineers. The state park's main feature is the C. J. Brown Reservoir, a flood control reservoir created by the USACE on Buck Creek (or Lagonda Creek) as part of a flood control system in the Ohio River drainage basin. The park offers year-round recreation including camping, boating, hunting, fishing, swimming, picnicking, and hiking.