Incredible Construction of Mike O'Callaghan Pat Tillman Memorial Bridge Against Massive Hoover Dam FaceWitness the absolutely breathtaking aerial construction footage of the Mike O'Callaghan Pat Tillman Memorial Bridge being built directly in front of the towering face of the iconic Hoover Dam, showing the incredible cable stay construction method used to advance the massive concrete arch spans out from both sides simultaneously over the deep Black Canyon gorge, with construction equipment, cran

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