Buck Creek State Park is a 4,016-acre (1,625 ha) Ohio state park in Clark County, Ohio in the United States. The park is leased by the state of Ohio from the U.S. Army Corps of Engineers. It includes C. J. Brown Reservoir and Dam, a flood control dam and reservoir built by the USACE as part of a flood control system in the Ohio River drainage basin. Buck Creek State Park is open for year-round recreation including camping, boating, hunting, fishing, swimming, picnicking and hiking.