Sources: Infrastructure Data Solutions, Regina, Saskatchewan; CP staff
Twenty-five years of sustained funding, plus advanced construction and engineering practices, have led to a steady improvement of the condition of U.S. bridges. Infrastructure Data Solutions’ (IDS) analysis of the Federal Highway Administration’s latest National Bridge Inventory data reveals a 12-point decline in the number of bridges deemed structurally deficient over a quarter century.
The latest Federal Highway Administration National Bridge Inventory (NBI) data show a total of 25 percent of the nation’s bridges 20 ft. or longer are either structurally deficient or functionally obsolete. Eleven percent of the 600,000-plus NBI crossings are structurally deficient, indicating significant deterioration of the deck, supports or other major components. Structurally deficient crossings may be posted for lower weight limits or closed if their condition warrants.