Last March, a container ship struck the Francis Scott Key Bridge in Maryland, leading to its disastrous collapse. Could the Golden Gate Bridge be at risk, too?

In a report released this week, the National Transportation Safety Board said owners of 68 bridges across the United States are due for a risk assessment to determine whether a similar vessel collision could take them down, too. Six of the bridges were in the Bay Area:

— Richmond-San Rafael Bridge (Contra Costa/Marin County)
— Carquinez Bridge (Contra Costa County)
— Benicia-Martinez Bridge (Solano County)
— Antioch Bridge (Contra Costa County)
— San Mateo-Hayward Bridge (San Mateo/Alameda County)
— Golden Gate Bridge (San Francisco/Marin County)

Had the Maryland Transportation Authority conducted this kind of assessment, they could “have known the risk and could have taken action to safeguard the Key Bridge,” NTSB Chair Jennifer Homendy said Thursday.

“Had they done that, the collapse could have been prevented,” she said.

The board said that bridges included on its list have not been assessed for risk of collapse in recent years, despite heavy traffic of containerships and cargo ships that pass beneath them.

All of the Bay Area bridges on the list were built before 1990, when highway safety officials began issuing guidance that all bridge owners conduct regular assessments to calculate the risk of a catastrophic collapse in the event of a vessel collision.

The Bay Bridge, which was originally built in 1936 and had its eastern span rebuilt in 2013, was the only local bridge not to appear on the NTSB list.