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GAO-16-72R 1 (2015-10-29)

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GAO U.S. GOVERNMENT ACCOUNTABILITY OFFICE
441 G St. N.W.
Washington, DC 20548


October 29, 2015

The Honorable Bill Shuster
Chairman
The Honorable Peter A. DeFazio
Ranking Member
Committee on Transportation and Infrastructure
House of Representatives

The Honorable Sam Graves
Chairman
The Honorable Eleanor Holmes Norton
Ranking Member
Subcommittee on Highways and Transit
Committee on Transportation and Infrastructure
House of Representatives

Transportation Infrastructure: Information on Bridge Conditions

Bridge safety remains a high-priority issue for our transportation system. Despite recent
progress in improving bridge conditions, 10 percent of the nation's 610,000 bridges
were considered structurally deficient as of December 2014, according to the Federal
Highway Administration's (FHWA) National Bridge Inventory (NBI).

FHWA, within the federal Department of Transportation (DOT), provides funding for the
design, construction, maintenance, inspection, evaluation, protection, and preservation
of the nation's bridges and oversees the implementation of the National Bridge
Inspection Standards, among other duties. State-level DOTs are responsible for
ensuring bridge inspections are completed and for inventorying bridges within their
states according to federal standards. The Moving Ahead for Progress in the 21 st
Century Act (MAP-21)1 made some substantial changes in how bridge projects can be
managed, funded, and prioritized by states.2 You asked us to determine what available
federal bridge data indicate about the condition of bridges throughout the United States.
This report examines the current conditions of the nation's bridges, as well as changes
in bridge conditions that have occurred over the last 10 years. On September 22, 2015,
we briefed committee staff on our preliminary findings, and this report transmits a final
version of those briefing slides (see enclosure I for briefing slides).

To conduct this work, we reviewed applicable laws, including MAP-21, and relevant
FHWA program guidance and documents. We reviewed and analyzed FHWA's NBI data

1Pub. L. No. 112-141, § 1106,126 Stat. 405,432 (2012).
2MAP-21 authorizes funding, through the National Highway Performance Program and the Surface Transportation
Program, to assist states in replacing and rehabilitating bridges.


GAO-16-72R Highway Bridge Conditions


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