Brocks Gap Dam
The 928th tallest dam in the world
Brocks Gap Dam was a never-built proposal for a water storage dam on the North Fork of the Shenandoah River at Brocks Gap in northwest Virginia. The proposal by the U.S. Army Corps of Engineers encountered opposition from local residents and was withdrawn in 1967.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).