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Glen Canyon Dam, Arizona. Completed in 1964, this 583 ft. high, concrete arch dam backs up the waters of the Colorado River to form Lake Powell. Beyond the dam is Glen Canyon Bridge, highest steel arch bridge in the world at 700 feet above the river.

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Glen Canyon Dam, Arizona. Completed in 1964, this 583 ft. high, concrete arch dam backs up the waters of the Colorado River to form Lake Powell. Beyond the dam is Glen Canyon Bridge, highest steel arch bridge in the world at 700 feet above the river.