Hoover Dam and Lake Mead, spanning the Arizona-Nevada state line, are located in the Black Canyon of the Colorado River in Mohave County, Arizona. Mohave County is in the northwest corner of Arizona. The dam is about 35 miles southeast of Las Vegas, Nevada.

The dam is a concrete thick-arch structure, 726.4 feet high and 1,244 feet long. The dam contains 3.25 million cubic yards of concrete; total concrete in the dam and appurtenant works is 4.4 million cubic yards.