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Hears the short answer Lake Mead. :)
Boulder City (Nevada).
Hoover dam impounds Lake Mead.
The lake near Las Vegas that helps the Hoover Dam generate electricity for the city is Lake Mead. It is America's biggest reservoir.
Nevada and Arizona; Lake Mead
The maximum depth of Lake Mead at Hoover Dam is nominally 500 feet when Lake Mead is filled to maximum pool elevation, based on the design of the dam. However, there has been extensive sedimentation throughout Lake Mead, and sediment now reaches depths of almost 100 feet at the bottom of Lake Mead near Hoover Dam. The current result is a maximum depth of about 400 feet when Lake Mead is at full pool elevation, and that maximum depth will continue to diminish over time.
Lake Mead is a reservoir near Las Vegas. It doesn't run anywhere.
There's only one lake near Las Vegas - Lake Mead.
The largest reservoir near Las Vegas is Lake Mead.
Lake Mead, the man-made lake formed behind Hoover Dam, is one of the largest artificially created bodies of water in the world. The dam is on the border of the states of Nevada and Arizona, situated in Black Canyon on the Colorado River, near Las Vegas, Nevada.
Perhaps the Colorado River on the Canyon floor, Lake Powell near the start of the Canyon or Lake Mead near the western end.
Lake Mohave is on the border between Nevada and Arizona, where the border follows the Colorado River south from Lake Mead to Fort Mohave, near Bullhead City.