Archived: Deficient Bridges by Highway System
Changes to STRUCTURALLY DEFICIENT (SD): Effective with the 2018 data, the definition of this term has changed as described on https://www.fhwa.dot.gov/bridge/britab.cfm. Please refer to https://www.fhwa.dot.gov/bridge/nbi/condition.cfm for Bridge Condition by Highway System.
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Archived Data. These are prior data that apply a cancelled agency policy known as the 10-year rule. When applied, the '10-year rule' excluded bridges built or reconstructed within the prior 10 years since they were not generally eligible for Highway Bridge Program funding.