Elizabeth Locks & Dam is one of nine navigational structures on the Monongahela River

Monongahela River

The Monongahela River is a river on the Allegheny Plateau in north-central West Virginia and southwestern Pennsylvania in the United States...

 between Pittsburgh

Pittsburgh, Pennsylvania

Pittsburgh is the second-largest city in the US Commonwealth of Pennsylvania and the county seat of Allegheny County. Regionally, it anchors the largest urban area of Appalachia and the Ohio River Valley, and nationally, it is the 22nd-largest urban area in the United States...

, Pennsylvania

Pennsylvania

The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...

 and Fairmont

Fairmont, West Virginia

Fairmont is a city in Marion County, West Virginia, United States. Nicknamed "The Friendly City". The population was 18,704 at the 2010 census...

, West Virginia

West Virginia

West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...

. Maintained and built by the U.S. Army Corps of Engineers, the gated dam forms an upstream pool that is for 23.8 miles, stretching to Charleroi, Pennsylvania

Charleroi, Pennsylvania

Charleroi is a borough in Washington County, Pennsylvania, along the Monongahela River, 25 miles south of Pittsburgh. Charleroi was settled in 1890 and incorporated in 1891. The population in 1900 stood at 5,930; in 1910, 9,615; in 1920, 11,516, and in 1940, 10,784...

.

The bridge is located at mile 23.8 of the river; it was modernized during a major reconstruction project in 1979-80.