Lake Mead is a man-made lake that lies on the Colorado River, about 24 mi (39 km) from the Las Vegas Strip, southeast of the city of Las Vegas, Nevada, in the states of Nevada and Arizona. It is the largest reservoir in the United States in terms of water capacity. Formed by the Hoover Dam on September 30, 1935, the reservoir serves water to the states of Arizona, California, and Nevada, as well as some of Mexico, providing sustenance to nearly 20 million people and large areas of farmland.
At maximum capacity, Lake Mead is 112 miles (180 km) long, 532 feet (162 m) at its greatest depth, has a surface elevation of 1,221.4 feet (372.3 m) above sea level and 247 square miles (640 km2) of surface area, and contains 26.12 million acre feet (3.222×1013 L) of water.
The lake has remained below full capacity since 1983 due to drought and increased water demand. As of July 2019, Lake Mead was at approximately 40% of full capacity with 10.4 million acre feet (1.28×1013 L) of held water. It has been smaller than Lake Powell (the second largest US reservoir when both are full) since 2013.
Post-Flash Lake Mead has had it's fair share of occupants, Most notably the barge with the Rad-X Mutants not aggressive towards humans. As well as the unknown occupants of the cave on Getaway Island that lays on Lake Mead. The Highway that stretches over the Lake to the other side has since collapsed and everything valuable has been looted from left-over vehicles on the bridge.