Glen Canyon Dam Bridge
Glen Canyon Dam Bridge
Page, Arizona, United States
690 feet high / 210 meters high
1,028 foot span / 313 meter span
1959
At the time of its completion in 1959, the Glen Canyon Dam bridge was the highest arch bridge in the world and the second highest bridge of any type. 50 years later it seems hard to believe that it no longer ranks even among the top 25 with a height of 690 feet (210 mtrs). Crossing the Colorado river about 12 miles (20 km) east of Grand Canyon National Park, the bridge was a necessary component in the construction of the massive Glen Canyon Dam, a concrete gravity arch structure that is as large as the much more famous Hoover Dam near Las Vegas. Behind the Glen Canyon dam is Lake Powell, one of the largest reservoirs in the United States with a 1,900 mile (3,057 km) shoreline. Construction of the dam began in 1956 and ended in 1963.
The town of Page, Arizona was built to accommodate the huge influx of workers that were needed to build and maintain the dam. With Page located on the south side of the river, the crossing made it easy to transport men and materials to the more remote north side. Among arch bridges, Glen Canyon is the 8th highest in the world and the 3rd highest in North America after the Pat Tillman-Mike O’Callaghan Memorial / Hoover Dam Bypass bridge and the New River Gorge bridge. With a span of 1,082 feet (330 mtrs), it is also one of North America’s longer steel arches.
To construct the bridge, two cableway towers were built on either side of the canyon rim 1,540 feet (470 mtrs) apart. Sections of the bridge were lowered into place and then held back by steel tieback cables until the two sides of the arch could finally rest on each other high over the Colorado river. The bridge was dedicated on February 20, 1959 and was the last link on a new segment of highway 89. The total cost was just 5 million dollars.
During the dam’s 8 year construction period, a less known but equally spectacular suspension footbridge was built upstream of the construction site for workers to cross. With a span of 1,280 feet (390 meters) and a height of 640 feet (195 mtrs), it is the largest and highest traditional, tower supported suspension footbridge ever built. In 2006, the Kokonoe “Yume” Otsurihashi footbridge opened in Japan’s Oita Prefecture with a span of 1,280 feet (390 meters). A more accurate conversion puts the Japanese bridge at 1,279.5276 feet - about 6 inches short of the Arizona bridge!
Another interesting “arch” in the region is the Rainbow bridge, one of the 10 largest natural bridges on earth. Reachable by boat on Lake Powell or via a long hike with a permit, the massive sandstone structure is 290 feet (88 meters) high with a span of 234 feet (71 meters). There are several natural arches that are higher and several that are longer but few have the perfect mixture of both that make Rainbow one of the most photogenic of all. For those who want to know a lot more about the world’s greatest and highest natural bridges, be sure to check out the Natural Arch and Bridge Society’s web site at http://www.naturalarches.org/index.html.
Image by Eric Sakowski / HighestBridges.com
