Lock & Dam 8, Allegheny River

Aerial view of Lock & Dam 8, Allegheny River1107 State Route 1033

Templeton, PA 16259-2209

724-548-5119 (unmanned)

Mailing address/contact:

830 River Road

Freeport, PA 16229-2031


Current Status

Allegheny River Lock and Dam 8 is in a caretaker status (IMTS Level 6). It will remain closed indefinitely except for commercial appointment lockages.


Lock and Dam 8 is located at river mile 52.6 near Mosgrove, PA in Armstrong County.


Lock and Dam 8 was built from 1928-31 and opened in 1931.

Project Information

Lock and Dam 8, like all navigation facilities on the Allegheny River, consists of a single lock chamber and a fixed crest dam. This type of dam is basically a concrete weir or wall across the river which keeps the river channel upriver of the project deep enough for navigation -- about 9 feet or more. Water which flows over this type of dam cannot be controlled locally. Consequently, it cannot provide any control over flood waters. An incidental benefit derived from the pool formed by the dam is the availability of a source of municipal and industrial water.