Image: Allegheny River Lock and Dam No.4

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Description: Lock and Dam Number 4 on the Allegheny River, Allegheny County, Pennsylvania, United States. Lock and Dam 4 was built from 1920-27, and opened in 1927.
Title: Allegheny River Lock and Dam No.4
Credit: U.S. Army Corps of Engineers Digital Visual Library Image page Image description page
Author: U.S. Army Corps of Engineers
Permission: This image or file is a work of a U.S. Army Corps of Engineers soldier or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain. English | italiano | Nederlands | русский | Türkçe | українська | +/−
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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