Obayashi Corp. and P.S. Mitsubishi Construction Co. Ltd., a Tokyo-based joint venture, beat three other bids to win the contract for constructing the new centerpiece of the Federal Highway Administration's Hoover Dam Bridge project -- a bridge to be built a quarter-mile downstream from the dam. The companies' $114 million bid is for the 1,905-foot-long single-arch bridge, which will tower 890 feet above the Colorado River and will be North America's longest single concrete span.

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