2025年1月19日 · Lake Mead, reservoir of Hoover Dam, one of the largest constructed lakes in the world, on the Arizona-Nevada border 25 miles (40 km) east of Las Vegas, Nevada, U.S. Formed by the damming of the Colorado River, Lake Mead extends 115 miles (185 km) upstream, is from 1 to 10 miles (1.6 to 16 km) wide, and has a capacity of 31,047,000 acre-feet ...