In 1955, New York's Tappan Zee bridge cost the modern-dollar equivalent of just $640 million to build -- but it's evolved into a multibillion-dollar headache for the current generation of city planners. The bridge is growing functionally obsolete, and officials say they may have to strike a deal with the private sector to raise funds for either expensive repair work or a full-scale replacement. "Unless things change very favorably rather quickly, it's unlikely that either the federal or state government will be able to finance the changes they're talking about," notes one local lawmaker.

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