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I have a feeling I'm not the only one that had no idea this was being built. Short story-construction started in 2005 and just last month they connected the two arches perfectly in the center. It will be a bypass around Hoover Dam which has multi-hour back ups daily right now. They used liquid nitrogen to cool the concrete! The arches were formed and poured in place. I pretty much get off on this kind of stuff. I'm sure if we had cable I would have seen a documentary on it.
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24 hours a day!
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Complete photo album here.