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.
(This is enough concrete to pave a 16 feet wide highway from San Francisco to New York City!) With the completion of the dam's main construction the diversion tunnels were closed to start filling Lake Mead. With the dam's building process complete, in 1935 Hoover Dam became the largest dam in the world.