National Bridge Inventory (NBI)

The National Bridge Inventory (NBI) is a detailed database maintained by the U.S. Department of Transportation that gathers information on all public bridges in the country. It includes data on each bridge’s location, size, type, construction material, condition, and how well it can handle traffic. Engineers and policymakers use this information to assess bridge safety, prioritize repairs, and plan improvements. The NBI helps ensure that bridges are maintained properly, preventing accidents and infrastructure failures, and supports transportation planning across the nation.