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AP IMPACT: Tough route for fixing aging bridges
Cracked concrete exposes parts of reinforcement bars on the Frederick Douglass Memorial Bridge which spans the Anacostia River in Washington on Wednesday, Sept. 4, 2013. The bridge, which carries more than 70,000 vehicles a day, was designed to last 50 years. Itís now 13 years past its life expectancy. An Associated Press analysis of 607,380 bridges in the most recent federal National Bridge Inventory showed that 65,605 were classified as "structurally deficient" and 20,808 as "fracture critical," making them higher risk bridges. (AP Photo/Alex Brandon)

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