|Total all bridges||572,205||589,674||601,396||603,259|
|Structurally deficient bridges, total||137,865||86,678||71,461||71,177|
|Functionally obsolete bridges, total||100,355||81,510||79,933||78,477|
Notes: Explanations 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 as of October 2010.
U.S. totals include the 50 states, the District of Columbia, and Puerto Rico. Data include: Rural-Interstate, principal arterial, minor arterial, major collector, minor collector and local roads; urban-interstate, other freeways or expressways, other principal arterial, minor arterial, collector, and local roads.
Data are as of Decemberfor 1990, 2008 and 2009 of those years and as of August for the year 2000.
Sources: 1990 and 2000: U.S. Department of Transportation, Federal Highway Administration, Office of Bridge Technology, National Bridge Inventory (NBI), personal communications, August 2001 and April 2008. 2008 and 2009: Ibid., Count, Area, Length of Bridges by Highway System, available at http://www.fhwa.dot.gov/bridge/britab.htm as of April 2010 as reported 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 October 2010.