Hoover Dam
726.4 feet high (221m)
1,244 feet wide (379 m)
660 feet (203 m) thick at the base
45 feet (13 m) thick at the top
$165 million dollars to build
4.5 years to build
4.4 million yards of concrete used for construction
March 1931 building began
September 30, 1935 President Franklin D. Roosevelt dedicated the completed dam

Powerhouse
17 generators
4+ billion kilowatt hours produced each year
10 acres of floor space

Power used by:
56% California
25% Nevada
19% Arizona

Lake Mead
6.5 years to fill (A slow filling process was required to lessen the pressure change on the dam and to help prevent small earthquakes due to land settlement.)
589 feet (181 m) at the deepest point
247 square miles in size
110 miles (176 km) long
Named after Dr. Elwood Mead, Commissioner of the Bureau of Reclamation (1924 - 1936)
Largest manmade reservoir in the United States 

Hoover Dam and Intake Towers just after construction

Hoover Dam and Intake Towers Today