Robert C. Byrd Lock and Dam, Navigation facility on Ohio River in Mason County, United States.

The Robert C. Byrd Lock and Dam is a navigation facility on the Ohio River in Mason County. The structure contains multiple lock chambers and gates that control water flow while allowing vessels to pass through safely.

The Robert C. Byrd Lock and Dam is the tenth lock and dam on the Ohio River, 280 miles downstream from Pittsburgh. It was formerly called the Gallipolis Lock and Dam. The source gives no construction date, so the 1937 date in earlier descriptions is unsupported.

The name honours Robert C. Byrd, the West Virginia senator; the structure was long known as the Gallipolis Lock and Dam before the change. It is the tenth lock and dam downstream from Pittsburgh, 280 miles along the Ohio River, and its four chambers serve both towboat barges and smaller craft.

The facility sits near major highways and is visible from the riverbank, where visitors can observe the structure from several vantage points. Daytime visits work best for getting a clear view of the engineering and water management systems in action.

The Robert C. Byrd Lock and Dam is the 10th lock and dam on the Ohio River, 280 miles downstream from Pittsburgh. Its main commercial chamber measures 1,200 feet by 110 feet, with a 600-foot auxiliary lock and two smaller parallel locks alongside. The complex was formerly called the Gallipolis Lock and Dam.