Federal agency wants Mackinac Bridge inspected. Why the NTSB is worried about ship strikes
Michigan's Mackinac Bridge is among 68 spans in the U.S. that should be evaluated for risk of collapse from a vessel ...
NTSB: Jacksonville's Dames Point Bridge has 'unknown' risk of collapse if hit by a vessel
Could the Dames Point Bridge collapse if struck by a vessel? The NTSB says the bridge is one of 68 needing further study to ...