Iowa ranks third in the nation in the number of structurally deficient bridges, though officials say they are inspected regularly and are safe.Data from the Federal Highway authority reveal 5,152 Iowa bridges --- most on rural county roads --- are structurally deficient, the same designation the collapsed bridge in Minneapolis received. The cause of the disaster has not been determined. A bridge is deemed structurally deficient if it needs significant maintenance, has weight restrictions or has been designated for replacement.
One of the reasons for Iowa's high ranking is the state rates fifth in the country in number of bridges, with 24,825.
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