what's the largest dam in the united states
List of tallest dams in the United States Most of the U.S.'s taller dams are located in the west because of the steeper and more rugged topography. The tallest is Oroville Dam in northern California, a 770.5-foot (234.8 m) embankment dam completed in 1968. Five of the ten highest dams in the U.S. are located in California. The Colorado, Columbia and Sacramento–San Joaquin river systems contain the greatest number of high dams. In the eastern U.S., tall dams are less common because of the lesser vertical relief. The tallest dam in the eastern U.S. is 480-foot (150 m) Fontana Dam in North Carolina, which ranks 20th in height among all U.S. dams.
Hoover Dam Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on September 30, 1935, by President Franklin D. Roosevelt. Its construction was the result of a massive effort involving thousands of workers, and cost over one hundred lives. Originally known as Boulder Dam from 1933, it was officially renamed Hoover Dam by a joint resolution of Congress in 1947. The dam was named after President Herbert Hoover.