View Report Sources

ASCE analysis of U.S. Department of Transportation, Federal Highway Administration. National Bridge Inventory ASCII files.

U.S. Department of Transportation, Federal Highway Administration. 2015 Status of the Nation’s Highways, Bridges and Transit: Conditions and Performance. January 2017.

U.S. Government Accountability Office. Report to Congressional Committees: Highway Bridges—Linking Funding to Conditions May Help Demonstrate Impact of Federal Investment. September 2016.