U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
FHWA requires inspections of all bridges carrying traffic on public roads to insure their safety and reliability. This program was initially mandated in the Federal-aid Highway Act of 1968, which led to the National Bridge Inspection Standards established in the Federal Register in 1971.
The NBIS (23 CFR 650, Subpart C) require States to:
In Washington State there are 7,717 bridges carrying public roads that are subject to the Federal inspection requirements. 3159 of those structures are State owned, with 3906 bridges owned by local agencies, and 651 owned by other agencies (Federal, Tribal, Parks, etc.).
Other key statistics: