Course of the Colorado River into the Virgin River, which ran southward through what is now Overton Arm to join the Colorado River near the now-ghost town of St. Thomas, Nevada. At Hoover Dam, the Colorado turns due south through Black Canyon, a direction it will follow for the remainder of its course to the Gulf of California. It passes under the Mike O'Callaghan–Pat Tillman Memorial Bridge (Hoover Dam Bypass), the highest concrete arch bridge in the world, carrying U.S. Route 93 at a height of above the Colorado River. At the end of Black Canyon the Colorado widens into Lake Mohave, created by the
Attack on the Sui-ho Dam void in power generation. The Sui-ho Dam (now Supung Dam or sometimes Shuifeng Dam) on the Yalu River (), at the time the fourth largest in the world, had been constructed in 1941 by Japan. The concrete dam was 2,800 feet (853 m) in length, 300 feet (97 m) thick at the base, 60 feet (18 m) wide at the crest, and 525 feet (160 m) in height. Its reservoir storage capacity was more than 20 billion cubic meters, and the Japanese had built six turbine generators each with a capacity of 100,000 kilowatts. The dam's generating facilities provided power