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gated dam forms an upstream pool that is 11.2 mi long, stretching to the base of the Point Marion Lock and Dam. It is located at river mile 82.

There is one lock chamber on the right descending bank of the river at the dam. The reservoir formed by the dam is also a municipal and industrial water supply. The structure is the third on the site. Originally, an 1880s stone masonry structure sat in this location; it was replaced in 1923 by a modern dam.