The National Transportation Safety Board lists four Delaware River bridges as possibly vulnerable to ship collisions and collapse. Here's the list.

An ominous report identifies 20 bridges nationwide at serious risk of ship collisions, potentially resulting in a collapse like the one that brought down the Francis Scott Key Bridge in Baltimore. A group of engineers from Johns Hopkins University in Baltimore analyzed the likelihood of ship/bridge collisions across the country,

It’s too late for the Francis Scott Key Bridge, but not for its longer and more heavily trafficked sibling span over the Chesapeake Bay. The National Transportation Safety Board criticized Maryland on Thursday for failing to assess the risk of a ship striking and collapsing the Key bridge,