Emsworth Locks and Dam, Navigation system on Ohio River in Pittsburgh, United States.

Emsworth Locks and Dam is a navigation facility on the Ohio River west of Pittsburgh consisting of two locks of different sizes and a gravity dam. The larger lock chamber is designed for cargo vessels while the smaller chamber accommodates smaller and private boats, with the dam extending on both sides of Neville Island.

Construction of the original facility began in 1919 and was completed in 1922, making it the oldest navigation project on the Ohio River. The structure was later expanded and modernized to meet growing demands of river traffic and regional commerce.

The facility connects regional industries and enables the transport of raw materials like coal and grain from the interior to downstream ports and power plants. Visitors can watch from observation points as large barges and occasionally recreational boats enter and exit the lock chambers.

The best vantage points for watching boats are from public observation areas along the river bank where you have a clear view of the locking process. Visit during daytime operating hours when boat traffic is regular and the facility is most active.

The dam has two gated sections, one on each side of Neville Island, and the site holds two separate lock chambers rather than one. The commercial lock measures 600 by 110 feet (180 by 34 metres); the auxiliary recreational lock measures 360 by 56 feet (110 by 17 metres).