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
Techi Dam released from Techi Dam also supports irrigation in the lower Daxia River valley, and reduces flood crests at the downstream Shihgang Dam by up to . Techi Dam Techi Dam () is a concrete thin arch dam on the Dajia River in Heping District, Taichung, Taiwan. Forming the Techi Reservoir, the dam is built in the Tachien Gorge in Heping District, providing hydroelectric power, irrigation water, and some flood control, and is operated by the Taiwan Power Company. At , it is the highest dam in Taiwan and one of the tallest dams in the world. The dam was completed