where is this dam located?
Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona.
Introduction
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.
who was president when the hoover dam was built Franklin D. Roosevelt.
In the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona In the Black Canyon of the Colorado River It is located in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona.
Hoover Dam Hoover Dam Hoover Dam
Introduction Introduction Introduction
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. 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 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. 
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Hoover Dam [SEP] Introduction
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 for President Herbert Hoover by a joint resolution of Congress in 1947. Since about 1900, the Black Canyon and nearby Boulder Canyon had been investigated for their potential to support a dam that would control floods, provide irrigation water and produce hydroelectric power.