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Glen Canyon Dam and Powerhouse, Arizona. Completed in 1964, this 580 ft. high concrete arch dam is backing up the waters of the Colorado River to form the 186 mile-long Lake Powell. Glen Canyon Bridge, the highest steel arch bridge in the world is 700 ft.

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Glen Canyon Dam and Powerhouse, Arizona. Completed in 1964, this 580 ft. high concrete arch dam is backing up the waters of the Colorado River to form the 186 mile-long Lake Powell. Glen Canyon Bridge, the highest steel arch bridge in the world is 700 ft.