A captain and barge company managers not identifying the crane they were towing was too high to pass under the Mackinac Bridge near Mackinaw City, Michigan, led to the crane hitting the bridge, the US National Transportation Safety Board (NTSB) has concluded.On May 7, 2023, the towing vessel Nickelena was transiting the Straits of Mackinac, while towing a deck barge transporting a crawler crane