Hebgen Dam - Credit: Wikimedia Commons
Hebgen Dam is a concrete-core earthen embankment dam in the western United States, located on the Madison River in southwestern Montana. The dam is tall and in length; its purpose is to store and regulate water for other downstream reservoirs and hydroelectric power plants. Montana Power Company originally built the dam, PPL Corporation purchased it in 1997 and sold it to NorthWestern Corporation in 2014. Read more on Wikipedia
Source: en.wikipedia.org