Allegheny River Lock and Dam No. 3
 The Allegheny River Lock and Dam No. 3 (also known as C.W. Bill Young Lock and Dam) in Harmar Township Allegheny County Pennsylvania and Plum Pennsylvania is a lock that was built in 1932. The lock and dam were built by the U.S. Army Corps of Engineers as a part of an extensive system of locks and dams to improve navigation along the Allegheny River.