Figure 4: Percentage of Highway Bridges with Deficiencies,
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.
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