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
Mohale Dam of the LHWP, is designed to divert about per second of storage to the Katse Dam reservoir. The water supply meets the needs of the Gauteng region which encompasses the mining and industrial cities of Johannesburg and Pretoria. The regulated flow from the reservoir is per second which is transferred as gravity flow through the interconnecting concrete lined tunnel of length with an internal diameter of . Mohale Dam is categorized as a high dam, and at in height it is said to be the highest rock-fill concrete-face dam (CFRD) in Africa. It is built as an embankment dam with