The Mackinac Bridge passed a safety review prompted by the Key Bridge collapse, but one risk calculation landed close to the national threshold.

The report is in response to a request from the NTSB to 30 owners of 68 spans in the U.S., recommending that each conduct a vulnerability assessment.

Testing requested by the National Transportation Safety Board shows the Mackinac Bridge is extremely unlikely to collapse in the event of a theoretical boat crash.

LANSING, Mich. (WLNS) — Engineers who examined the structural integrity of the Mackinac Bridge following the deadly crash-induced collapse of a bridge in Baltimore confirm it is at low risk of ...