The Chesapeake and Ohio Canal operated from 1831 until 1924 along the Potomac River from Washington, D.C., to Cumberland, Maryland. Construction on the 184.5-mile (296.9 km) course began in 1828 and ended in 1850 with the completion of a 50-mile stretch to Cumberland, rising and falling over an elevation change of 605 feet (184 meters) that required 74 locks. A planned section to Pittsburgh and the Ohio River was never built.