Spring Hollow Reservoir
Virginia, United States
Spring Hollow Reservoir is a 158-acre (0.64 km2), 3.3-billion-US-gallon (12, 000, 000 m3) off-stream reservoir in Roanoke County, Virginia with the largest roller-compacted concrete dam east of the Mississippi having commenced operation in 1996, it is now the main source of water for residents of Roanoke County.
Reservoir data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).