|Structurally deficient||Functionally obsolete||Total|
|Principal arterial - Interstate||1,108||3,193||27,579|
|Other principal arterial||1,964||3,565||35,652|
NOTES: Functionally obsolete refers to bridges that do not have the lane widths, shoulder widths, or vertical clearances adequate to serve traffic demand, or the bridge may not be able to handle occasional roadway flooding. Structurally deficient refers to bridges needing significant maintenance attention, rehabilitation, or replacement.
SOURCE: U.S. Department of Transportation, Federal Highway Administration, Office of Engineering, Bridge Division, National Bridge Inventory database, available at http://www.fhwa.dot.gov/bridge/britab.htm, as of December 2002.