DETROIT (AP) -- Michigan has at least 28 bridges that are classified as needing close observation and future upgrades.
The Associated Press analyzed data on bridges nationwide. At least 28 in Michigan are considered "structurally deficient" and "fracture critical," key terms bridge inspectors use.
Officials say that doesn't mean the bridges are unsafe for travel. If so, they'd be closed.
Major bridges include the Davison access to Interstate 75 in Detroit, the span over the Saginaw River's east channel in Bay City, and the M-20/Tittabawassee River bridge in Midland. The Midland bridge could be rebuilt in 2018.
A bridge is structurally deficient if at least one major component has significant deterioration. A bridge is fracture critical if the failure of a vital component could cause a collapse.