Flat Rock Dam (Pennsylvania)
The 928th tallest dam in the world
The Flat Rock Dam is an earthen dam which stretches across the Schuylkill River. It is part of the Flat Rock Park maintained by Lower Merion Township, Montgomery County, Pennsylvania, and is located off the Schuylkill Expressway in Gladwyne.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).