The Pepacton Reservoir, also known as the Downsville Reservoir or the Downsville Dam, is a reservoir in Delaware County, New York that was formed by impounding over ¼ of the East Branch of the Delaware River. New York City purchased the valley in 1942, displacing 974 people, destroying four towns (Arena, Pepacton, Shavertown and Union Grove), and submerging nearly ½ of the Delaware and Northern Railroad in the process. The dam, located at Downsville, was finished in 1954, and the flooding was completed in 1955. Peapackton is a Lenape Native American term meaning "marriage of the waters".