Summit Natural Gas of Missouri Inc. has worked hard to maintain our rates while bringing natural gasâa cleaner, lower cost energy sourceâto you and your region. In order to continue to provide you with the [...]
Hoover Dam. Hoover Dam, formerly called Boulder Dam, dam in Black Canyon on the Colorado River, at the Arizona-Nevada border, U.S. Constructed between 1930 and 1936, it is the highest concrete arch dam in the United States. It impounds Lake Mead, which extends for 115 miles (185 km) upstream and is one of the largest manmade lakes in the world.
Amazingly, they completed the dam in less than five years -- ahead of schedule and under budget. The Hoover Dam is a curved gravity dam. Lake Mead pushes against the dam, creating compressive forces that travel along the great curved wall. The canyon walls push back, counteracting these forces. This action squeezes the concrete in the arch together, making the dam very rigid.