Charleroi Lock and Dam

Charleroi Lock and Dam - Credit: Wikimedia Commons

Charleroi Locks & Dam, officially known as Locks & Dam 4 by the US Army Corps of Engineers, is one of nine navigational structures on the Monongahela River between Pittsburgh, Pennsylvania and Fairmont, West Virginia. Maintained and built by the U.S. Army Corps of Engineers, the gated dam forms an upstream pool that is for 19.7 miles to the Maxwell Lock & Dam. Read more on Wikipedia

type: dam
date from: 1932

Source: en.wikipedia.org