Allegheny Lift Lock No. 4 & Weigh Lock, North shore of Allegheny River, 0.25 mile Northeast of Ninth Street Bridge, Pittsburgh, Allegheny County, PA
Significance: The Allegheny Locks were among the few canal-related structures surviving in Pittsburgh. The locks are near the western terminus of the Pennsylvania Canal which has been determined to be of national significance by the Pennsylvania Historic and Museum Commission for its role in the history of American transportation.
Unprocessed Field note material exists for this structure: N576
Survey number: HAER PA-106
Building/structure dates: 1829 Initial Construction
Building/structure dates: 1861 Subsequent Work