In 2021, there were 146,000 bridges in the US National Highway System. And as of that June, 44,000 of them were in “poor” condition.
The National Bridge Inventory ranks bridge quality as good, fair, or poor. The inventory assigns bridges numerical ratings for the conditions of a bridge's roadway and structural components. A rating of seven or higher means that part is “good;” a five or six is “fair;” and four or less is “poor.” The four lowest ratings determine the overall bridge quality.
