The NTSB identified 68 bridges across the country, including both the east- and west-bound spans of the Bay Bridge and the Chesapeake City Bridge, with an  an “unknown level of risk of

Almost a year after the Francis Scott Key Bridge in Baltimore collapsed as a container ship slammed into it, the National Transportation Safety Board is urging the owners of 68 major bridges in 19 states to assess their vulnerability to such a disaster — including five in the Philadelphia region.