68 U.S. Bridges Lack Risk Assessment

Staff
By Staff
3 Min Read

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When the Day container ship struck the Francis
Scott Key Bridge in Baltimore,

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the deadly collapse triggered an NTSB
investigation into US infrastructure.

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The safety agency wanted to see if other
bridges could be susceptible to similar strikes.

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About 2 weeks ago, the NTSB identified 68
bridges across 19 states that should conduct a

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vulnerability assessment.

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After the Key bridge collapsed, an NTSB
investigation found that it was nearly 30 times

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above the acceptable risk threshold for
critical or essential bridges,

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a metric that was set by.
The American Association of State Highway and

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Transportation Officials.
The 68 bridges NTSB flagged were designed

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before AS2 guidance was established and don’t
have a current vulnerability assessment.

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Now the NTSB isn’t saying that these bridges
will collapse,

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it merely wants the 30 bridge owners to
evaluate whether they are above acceptable risk

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levels.
If the risk level is high.

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The NTSB wants the owners to develop and
implement a comprehensive risk reduction plan.

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AS2 created vulnerability assessment
calculations for new bridges in 1991 in

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response to the Sunshine Skyway bridge collapse
in Florida.

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Since 1994, the Federal Highway Administration
has required new bridges to be designed to

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minimize the risk of a catastrophic bridge
collapse from a vessel collision.

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The NTSB found that had the Maryland
Transportation Authority conducted a

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vulnerability assessment on the Key Bridge, it
could have been proactive in reducing the

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bridge’s risk of collapse.

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Neither the FHWA nor Ash to can require a
bridge owner to complete a vulnerability

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assessment for a bridge designed before the
release of the 1991 guidelines.

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The full list included below has some pretty
notable structures,

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including the Golden Gate Bridge in California
built in 19.

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37, the Sunshine Skyway Bridge in Florida,
built in 1986.

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The Talmadge Bridge in Georgia built in 191.
The Leo Frego Bridge in Green Bay,

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Wisconsin built in 1979 in Chicago’s Skyway
Bridge built in 1958.

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New York topped the list with 13 bridges,
including the Brooklyn Bridge,

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which was built in 1883, as well as the.
Manhattan and Williamsburg bridges.

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Louisiana had the 2nd most with 8 and 7 bridges
were flagged in California.

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The NTSB has recommended that an
interdisciplinary team of experts be

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established to provide guidance and assistance
to bridge owners on evaluating and reducing the

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risk, which could mean infrastructure
improvements or operational changes.

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I’m David Manti.
This is manufacturing now.

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