The Hoover Dam is a key project for the comprehensive development of the Colorado River water resources in the United States. It is located at the Black Gorge at the junction of Nevada and Arizona. It has comprehensive benefits such as flood control, irrigation, power generation, shipping and water supply. The dam is a concrete gravity arch dam, the height of the dam is 221.4m, the reservoir formed by the dam is called Lake Meade, the total reservoir capacity is 348.5 billion cubic meters, the installed capacity of the hydropower station was originally 1.34 million kW, and it has been expanded to 2.08 million kW, and it is planned to reach 245.2 million kW. Construction began in April 1931, completed in March 1936, and the first unit was officially generated in October 1936. Overlooking the Hoover Dam in northwest Arizona, on Interstate 93, at the junction of Nevada and northwestern Arizona, there is an hour difference between Arizona and Nevada, so there are clocks at each end of the dam to facilitate the time travel. From Las Vegas, about 40 kilometers southeast. The project is huge and plays a huge role in the development of industry and agriculture. So it occupies an important position in the world's water conservancy engineering. The construction of the Hoover Dam cost a lot of money, mobilized a lot of manpower, completed and put into use in 1936. It is an arch-type gravity artificial concrete dam. It is 220 meters high, 200 meters wide, 14 meters wide, and 377 meters long. Such a huge dam is rare in the world. The Colorado River under the dam, once the deepest and most rapid river in the United States, is now slowly moving like a tame beast.