The Chesapeake and Ohio Canal National Historical Park is a United States National Historical Park located in the District of Columbia and the states of Maryland and West Virginia. The park was established as a National Monument in 1961 by President Dwight D. Eisenhower in order to preserve the neglected remains of the Chesapeake and Ohio Canal along the Potomac River along with many of the original canal structures. The canal and towpath trail extends from Georgetown, Washington, D.C. to Cumberland, Maryland, a distance of 184.5 miles (296.9 km).
The abandoned canal was purchased in 1938 by the United States Government and placed under the care of the National Park Service, which planned to restore it as a recreation area. Although the bottom 22 miles (35 km) of the canal were repaired and rewatered, the project was halted when the United States entered World War II and resources were needed elsewhere. After the war, Congress expressed interest in developing the canal and towpath as a parkway.