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According to the Federal Highway Administration, the National Bridge Inventory has tracked the condition of every U.S. public highway bridge since 1968, when the program was created after the Silver Bridge collapse. It now spans more than 3,000 counties across all 50 states, the District of Columbia, and the territories, and each structure is re-inspected on a two-year cycle. Start with the alphabetical index below, or go straight to a state to see its county breakdowns, condition distribution, and the structures most in need of repair — every figure is reproduced exactly as the FHWA records it, as our methodology documents.