Get an aerial view of one of America's tallest bridges, compliments of contributor Luiz Gerbase. The Navajo Bridge in the Southwestern USA state of Arizona is actually two separate spans over the Colorado River. The original bridge opened in 1929 and is 250 meters long (834 ft.). The second span, which is 23 meters (75 ft.) longer, opened in 1995 and now handles all vehicular traffic. With a height of about 142 meters (around 470 ft.), both rank amongst the country's ten tallest bridges.