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
Portugués Dam is filled and the dam tested, it is expected to be operational in early 2015. The Portugués Dam is a high and long single-centered roller-compacted concrete thick arch. Containing of roller-compacted concrete, it is thick at its base and thick at its crest. The dam has an uncontrolled spillway center-left side, over the river bed; below the dams crest of above sea level. The center of the dam straddles an intake and outlet structure which will draw water from behind the dam and discharge it into the river valley. During excavation, a Pre-Columbian era ceremonial plaza ("batey" or ball court)