Number of bridges
|Total all bridges||593,813||595,363||597,340||599,766||601,396||603,259|
|Structurally deficient bridges, total||77,752||75,923||73,784||72,520||71,461||71,177|
|Functionally obsolete bridges, total||80,567||80,412||80,317||79,804||79,933||78,477|
NOTES: Data for 200406 are as of July of those years; data for
200709 are as of December of those years.
Definitions for the terms Structurally deficient and Functionally obsolete can be found on pages 14 and 15 in Chapter 3 of the Federal Highway Administration's 2006 Conditions and Performance Report, available at http://www.fhwa.dot.gov/policy/2006cpr/pdfs/chap3.pdf. U.S. totals include the 50 states, the District of Columbia, and Puerto Rico. Table includes: rural-interstate, principal arterial, minor arterial, major collector, and local roads; urban-interstate, other freeways or expressways, other principal arterial, minor arterial, collector, and local roads.
SOURCE: U.S. Department of Transportation, Federal Highway Administration, Office of Bridge Technology, National Bridge Inventory (NBI), Count of Bridges by Highway System, available at http://www.fhwa.dot.gov/bridge/britab.htm as of Apr. 23, 2010 as cited in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 1-27, available at http://www.bts.gov/publications/national_transportation_statistics/ as of August 2010.