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.

The recommendations come as part of an ongoing investigation of the collapse of the Francis Scott Key Bridge in Baltimore last year.

A year after the collapse of the Francis Scott Key Bridge in Maryland, federal safety officials are urging bridge owners to conduct risk assessments to prevent another tragedy.