boulderdam Structure renamed for a president in 1947 Project for giant beavers? Part of the Arizona/Nevada border Now Hoover Mountain mama? It was renamed for Hoover in 1947 Colorado River construction, briefly Barrier later renamed for Herbert Hoover Colorado River landmark dedicated by F.D.R. Officially, the Hoover Colorado River site Former name of a Colorado River site Former name of a Colorado River barrier It formed Lake Mead It was renamed for Herbert Hoover Lake Mead holder, originally