2017 Bridge Report

There are 185 million daily crossings on nearly 56,000 structurally deficient U.S. bridges.
About 1,900 of those bridges are on the Interstate Highway System.

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0-4.9% of bridges structurally deficient 5-8.9% of bridges structurally deficient 9% or higher bridges structurally deficient
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Source: Bridge data is from the 2016 National Bridge Inventory ASCII files, released by the Federal Highway Administration in January 2017. Note that specific conditions on bridges may have changed as a result of recent work.