Highway Bridges: Federal Highway Administration Could Better Assist States with Information on Corrosion Practices, Report to Congressional Committees [open pdf - 4MB]
From the Highlights: "In 2021, U.S. bridges, including those on the NHS [National Highway System], were estimated to need billions of dollars in repairs, including efforts to mitigate the effects of corrosion. House Report 116-106 included a provision for GAO [Government Accountability Office] to review the status of states' bridge corrosion-control planning. This report examines: (1) trends in the condition of bridges on the NHS and what is known about how corrosion affects bridge condition, (2) practices states use to address corrosion on NHS bridges and how selected states prioritize efforts to address corrosion, and (3) how FHWA [Federal Highway Administration] assists states in addressing bridge corrosion. GAO reviewed applicable statutes, regulations, guidance, and studies related to corrosion prevention and management, and analyzed data on NHS bridges. GAO selected five states--Florida, Illinois, Kansas, Rhode Island, and Wyoming--based on factors, such as the percentage of bridge deck area in good and poor condition and geographic diversity. Finally, GAO interviewed FHWA, state transportation, and various association officials and assessed FHWA's actions against internal controls for using quality information."
Government Accountability Office: http://www.gao.gov/