Hoover Dam on the Colorado River forms the largest reservoir in United States in maximum water capacity, Lake Mead. Previously much of the traffic from Arizona to Las Vegas, Nevada crossed the river on the road across the dam. But since the construction of the Mike O’Callaghan – Pat Tillman Memorial Bridge (Colorado River Bridge), traffic over the dam has been limited. The bridge is 900 feet over the river. In this panorama you can see the Bridge, the top of the Dam and down into the Black Canyon to the River below the Dam. The Dam is 726.4 feet from the rock foundation to the roadway. The towers over the dam rise another 40 feet. The Dam is 1,244 feet across the top and 660 feet thick at the base. The Dam featured prominently in the 2007 Transformers movie called simply “Transformers.” The Dam was constructed between 1931 and 1936.