20th Century (29,078)
Allegheny County, Pennsylvania (282)
Allegheny River Navigation System MPS (8)
Army Corps of Engineers (118)
Built 1920 (568)
Built during 1920s (8,419)
Dam (150)
| Lock (51)
Lock and dam (22)
Modern Movement (2,586)
Moderne (741)
Natrona, Pennsylvania (2)
Owned by federal government (3,225)
Pennsylvania (4,380)
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