Figure 5: Number of Highway Bridges Categorized as Structurally Deficient, 1992-2006

Figure 5: Number of Highway Bridges Categorized as Structurally Deficient, 1992-2006

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NOTE: Bridges that are both structurally deficient and functionally obsolete are classified as structurally deficient. Numbers include the 50 U.S. states, the District of Columbia, and Puerto Rico.

SOURCES: U.S. Department of Transportation, Federal Highway Administration, National Bridge Inventory, Deficient Bridges by State and Highway System, various years, available at http://www.fhwa.dot.gov/bridge/britab.htm as of Aug. 14, 2007.