Missouri Department of Conservation Rock Bridge Memorial State Park was established in 1945 and was the largest state park dedicated to a natural resource until the establishment of Ozark National Scenic Riverways in 1961. Rock Bridge Memorial State Park is in the vicinity of Hannibal and has received many European immigrants who settled in the region, including the Hoop brothers. During the Civil War, the Confederate Army crossed Rock Bridge and camped there for a time. The bridge is a 240-foot-long (73 m) natural limestone arch spanning an 11-acre (4.9 ha) limestone gorge.
Activities at Rock Bridge Memorial State Park include hiking, camping, picnicking, hunting, fishing, swimming, boating, and birding. Hiking trails are open for hiking, running, and mountain biking. Campsites are available on a first-come, first-served basis or in a season-based reservation system. Hiking and camping are allowed only from March 1 to November 30, though hunting is allowed from November 16 to April 15.