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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Year Structurally Deficient (Thousands)
1992 118.70
1993 111.51
1994 107.48
1995 103.92
1996 101.52
1997 98.48
1998 93.08
1999 88.15
2000 86.69
2001 83.63
2002 81.44
2003 79.81
2004 77.76
2005 75.87
2006 73.76

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.