New Cumberland Locks and Dam, Lock and gravity dam system in Hancock County, United States.

New Cumberland Locks and Dam is a lock and dam system on the Ohio River in Hancock County that manages water flow and vessel traffic. The structure includes a main lock for larger commercial vessels and an auxiliary lock for smaller boats, allowing navigation across the river's elevation changes.

The system was constructed during the mid-20th century to improve navigation on the Ohio River for regional commerce. Its completion created a more reliable shipping route that has supported inland waterway transportation.

The Pittsburgh District of the U.S. Army Corps of Engineers manages the site, while the Huntington and Louisville districts also hold responsibility for Ohio River navigation. The two locks handle about 320 commercial lockages and 120 recreational lockages each month, a rhythm visible from the riverbank.

The dam lies 54 miles downstream of Pittsburgh, in Hancock County, West Virginia, near Weirton. Two locks operate side by side: the 1,200-by-110-foot commercial lock and a 600-by-110-foot auxiliary lock for recreational craft. Commercial traffic averages about 320 lockages a month, the auxiliary lock about 120, so waiting is possible at busy periods.

The facility is part of a larger system of locks along the Ohio River that creates a major inland waterway network for cargo transport. This infrastructure allows barges to carry goods across multiple states through connected waterways.