September 19, 2011 7:14 AM

Ohio River bridge put spotlight on nation's aging infrastructure

President Barack Obama is using a crumbling Kentucky bridge over the Ohio River as a prime example of the need to rebuild the nation's aging infrastructure. One in four of the nation's 599,766 bridges are rated "structurally deficient" (in need of reconstruction) or "functionally obsolete" (too small for modern traffic loads), according to a 2008 report by the American Association of State Highway and Transportation Officials.

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