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Road Bridge Condition
Some discrepancies exist between the total number of bridges reported in tables 1-5, 1-6, and 1-7 because of bridges not identified in one or more of the categories and other anomalies. Definitions of the terms Structurally Deficient and Functionally Obsolete can be found in the Federal Highway Administration 2013 Conditions and Performance Report at http://www.fhwa.dot.gov/policy/2013cpr/.
U.S. Department of Transportation, Federal Highway Administration, Office of Bridge Technology, National Bridge Inventory, Functional Classification of Bridges by Highway System, available at www.fhwa.dot.gov/bridge/nbi.cfm as of June 2015.