Hoover Dam, once known as Boulder Dam, is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the US states of Arizona and Nevada. It was constructed between 1931 and 1936 during the Great Depression
Ranked among the most beautiful in the world, Fontana Dam is the highest dam east of the Rocky Mountains. The Appalachian Trail crosses the top of the dam. Constructed in 1942-43, the dam is 480 ft. high and 2,365 ft. long. It is located in the Great Smokey Mountains near Cherokee, NC.
GRAND COULEE DAM Grand Coulee Dam is located on the Columbia River in the US state of Washington. It is a gravity dam which is built to produce hydroelectric power and provide irrigation. Grand Coulee Dam is the largest electric power-producing facility in the United States.