The Kinzua Dam, in the Allegheny National Forest in Warren County, Pennsylvania, is one of the largest dams in the United States east of the Mississippi River.

The dam is located 6 miles (10 km) east of Warren, Pennsylvania, along Route 59, within the 500,000-acre (200,000 ha) Allegheny National Forest. A boat marina and beach are located within the dam boundaries. In addition to providing flood control and power generation, the dam created Pennsylvania’s deepest lake, the Allegheny Reservoir.

http://en.wikipedia.org/wiki/Kinzua_Dam
http://www.theallegheny.com/Kinzua_Dam