|Total all bridges||572,205||589,674||599,766||601,396|
|Structurally deficient bridges, total||137,865||86,678||72,520||71,461|
|Functionally obsolete bridges, total||100,355||81,510||79,804||79,933|
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, 2006 Conditions and Performance Report, available at http://www.fhwa.dot.gov/policy/2006cpr/pdfs/chap3.pdf as of September 2009.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 for 1990, 2007 and 2008 are as of December of those years and for 2000 as of August of that year.
Sources: Federal Highway Administration, Office of Bridge Technology, National Bridge Inventory Database, Count, Area, Length of Bridges by Highway System, available at http://www.fhwa.dot.gov/bridge/britab.htm as of March 2009 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 as of September 2009.