A new report reveals that several Bay Area bridges have an “unknown level of risk” for collapse and should be evaluated. The report, released by the National Transportation Safety Board last week, recommends that 68 bridges across the United States conduct a “vulnerability assessment” to determine the risk of a ship collision.

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