9. Hoover Dam Bypass (Mike O’Callaghan-Pat Tillman Memorial Bridge)
The Mike O’Callaghan-Pat Tillman Memorial Bridge, also known as the Hoover Dam Bypass, is a dramatic concrete arch bridge spanning the Colorado River between Nevada and Arizona. Opened in 2010, this engineering marvel stands as the second highest bridge in the United States, soaring 890 feet above the river below. Designed to relieve traffic congestion from the historic Hoover Dam, it represents a new era of American infrastructure—combining safety, efficiency, and breathtaking design.
