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
Puclaro Dam 3,800 m³/s). The upstream concrete face varies in thickness from 0.45 m to 0.30 m. Puclaro dam is founded on very pervious alluvial foundations more than 100 m deep. Puclaro Dam Puclaro is an artificial lake created by a dam on the Elqui River, 40 km east of the city of La Serena, Coquimbo Region and 500 km north of Santiago. Regular strong winds make the lake a popular place for kitesurfing. Its purpose is to improve the irrigation of 21,000 ha of farmland in the Elqui valley. Puclaro Dam is an 83 m tall and 640 m long concrete