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
Belver Dam Belver Dam Belver Dam () is a concrete gravity dam on the Tagus, where the river forms the border line between the Portuguese districts of Portalegre and Santarém. It is located in the municipality Gavião, in Portalegre District. Construction of the dam began in 1945. The dam was completed in 1952. It is owned by "HIDROTEJO". Belver Dam is a (height above foundation) and gravity dam with a crest altitude of . The volume of the dam is 90,000 m³. The spillway is part of the dam body (10 roller gates with a maximum discharge capacity of 18,000 m³/s). At