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Glen Canyon Dam and Powerhouse, Ariz. A key structure on the upper Colorado River is 580 ft. above the river level and created 186 mil-long Lake Powell. The Diversion Tunnel discharges water for testing purposes only. Glen Canyon Bridge, highest steel arc

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Glen Canyon Dam and Powerhouse, Ariz. A key structure on the upper Colorado River is 580 ft. above the river level and created 186 mil-long Lake Powell. The Diversion Tunnel discharges water for testing purposes only. Glen Canyon Bridge, highest steel arc