|Total all bridges||572,205||589,674||597,340||599,766|
|Structurally deficient bridges, total||137,865||86,678||73,784||72,520|
|Functionally obsolete bridges, total||100,355||81,510||80,317||79,804|
Key: R = revised.
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 November 2008.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 are as of December of that year; data for 2000 are as of August of that year; data for 2006 are as of July of that year; data for 2007 are as of December of that year.
Sources: Federal Highway Administration, Office of Bridge Technology, National Bridge Inventory Database, Count of Bridges by Highway System, available at http://www.fhwa.dot.gov/bridge/britab.htm, as of March 2008 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 November 2008.