Transcript
When the Dali containership struck the Francis Scott Key Bridge in Baltimore, the deadly collapse triggered an NTSB investigation into U.S. infrastructure. The safety agency wanted to see if other bridges could be susceptible to similar strikes.
About two weeks ago, the NTSB identified 68 bridges across 19 states that should conduct a vulnerability assessment.
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After the Key Bridge collapsed, an NTSB investigation found that it was nearly 30 times above the acceptable risk threshold for critical or essential bridges, a metric set by the American Association of State Highway and Transportation Officials (AASHTO).
The 68 bridges NTSB flagged were designed before AASHTO guidance was established and don't have a current vulnerability assessment.
The NTSB isn't saying that these bridges will collapse; it merely wants the 30 bridge owners to evaluate whether they are above acceptable risk levels. If the risk level is high, the NTSB asks the owners to develop and implement a comprehensive risk reduction plan.
AASHTO created the vulnerability assessment calculation for new bridges in 1991 in response to the Sunshine Skyway Bridge collapse in Florida.
Since 1994, the Federal Highway Administration (FHWA) has required new bridges to minimize the risk of a catastrophic bridge collapse from a vessel collision.
The NTSB found that if the Maryland Transportation Authority had conducted a vulnerability assessment on the Key Bridge, it could have been proactive in reducing the bridge's risk of collapse.
Neither the FHWA nor AASHTO can require a bridge owner to complete a vulnerability assessment for a bridge designed before the release of the 1991 guidelines.
The list (included below) has some pretty notable structures, including the Golden Gate Bridge in California, built in 1937; the Sunshine Skyway Bridge in Florida, built in 1986; the Talmadge Bridge in Georgia, built in 1991; Leo Frigo Bridge in Green Bay, Wisconsin built 1979 and Chicago's Skyway bridge built in 1958.
New York topped the list with 13 bridges, including the Brooklyn Bridge, which was built in 1883, as well as the Manhattan and Williamsburg bridges. Louisiana had the second most bridges with eight and seven bridges were flagged in California.
The NTSB has recommended that an interdisciplinary team of experts be established to provide guidance and help bridge owners evaluate and reduce risk, which could mean infrastructure improvements or operational changes.
A list of U.S. bridges with unknown levels of collapse risk from a vessel collision:
California
- Richmond-San Rafael Bridge
- Carquinez Bridge
- Benicia-Martinez Bridge
- Antioch Bridge Bay
- San Mateo-Hayward Bridge
- Coronado Bridge
- Golden Gate Bridge Golden Gate Bridge
Delaware
- Summit Bridge
- Saint Georges Bridge
- Reedy Point Bridge
Florida
- Sunshine Skyway Bridge
- Napoleon Bonaparte Broward Bridge (Dames Point Bridge)
Georgia
- Talmadge Bridge
Illinois
- Chicago Skyway Calumet River Bridge
Louisiana
- Huey P. Long Bridge
- Greater New Orleans Bridge
- Israel LaFleur Bridge
- Crescent City Connection Bridge
- Hale Boggs (Luling) Bridge
- Horace Wilkinson Bridge
- Gramercy (Veterans Memorial) Bridge
- Sunshine Bridge
Maryland
- William Preston Lane Jr. (Bay) Bridge (eastbound)
- William Preston Lane Jr. (Bay) Bridge (westbound)
- Chesapeake City Bridge
Massachusetts
- Tobin Bridge (southbound upper)
- Tobin Bridge (northbound lower)
- Bourne Bridge
- Sagamore Bridge
Michigan
- Mackinac Bridge
New Hampshire
- Memorial Bridge
New Jersey
- Commodore Barry Bridge
- Vincent R. Casciano (Newark Bay) Bridge
New York
- Verrazano Narrows Bridge (eastbound)
- Verrazano Narrows Bridge (westbound)
- Brooklyn Bridge
- Manhattan Bridge
- Williamsburg Bridge
- Newburgh-Beacon Bridge (eastbound)
- Newburgh-Beacon Bridge (westbound)
- Rip Van Winkle Bridge
- Ogdensburg-Prescott International Bridge
- George Washington Bridge
- Outerbridge Crossing Bridge
- Seaway International Bridge
- Thousand Islands Bridge
Ohio
- CUY-00490-0010 (I-490) Bridge
- CUY-00002-1441 (Main Avenue) Bridge
- CUY-00006-1456 (Detroit Avenue) Bridge
- CUY-00010-1613 (Carnegie Avenue) Bridge
- LUC-01W02-0002 (Dr. Martin Luther King Jr. Memorial) Bridge
- LUC-00002-1862 (Anthony Wayne) Bridge
Oregon
- Astoria-Megler Bridge
- St. Johns Bridge
Pennsylvania
- Walt Whitman Bridge
- Benjamin Franklin Bridge
- Betsy Ross Bridge
- Delaware River Turnpike Bridge
Rhode Island
- Claiborne Pell Newport Bridge
Texas
- Buffalo Bayou Toll Bridge
- Sidney Sherman Bridge
- Rainbow Bridge
- Veterans Memorial Bridge
- Hartman Bridge (eastbound)
- Hartman Bridge (westbound)
- GulfGate Bridge
Washington
- Lewis and Clark Bridge
Wisconsin
- Leo Frigo Bridge
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WEBVTT
X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:0
00:00.330 --> 00:04.199
When the Day container ship struck the Francis
Scott Key Bridge in Baltimore,
00:04.369 --> 00:09.239
the deadly collapse triggered an NTSB
investigation into US infrastructure.
00:09.600 --> 00:14.739
The safety agency wanted to see if other
bridges could be susceptible to similar strikes.
00:14.899 --> 00:21.819
About 2 weeks ago, the NTSB identified 68
bridges across 19 states that should conduct a
00:21.819 --> 00:23.250
vulnerability assessment.
00:23.459 --> 00:28.680
After the Key bridge collapsed, an NTSB
investigation found that it was nearly 30 times
00:28.680 --> 00:33.330
above the acceptable risk threshold for
critical or essential bridges,
00:33.419 --> 00:37.459
a metric that was set by.
The American Association of State Highway and
00:37.459 --> 00:42.029
Transportation Officials.
The 68 bridges NTSB flagged were designed
00:42.029 --> 00:47.709
before AS2 guidance was established and don't
have a current vulnerability assessment.
00:47.950 --> 00:51.659
Now the NTSB isn't saying that these bridges
will collapse,
00:51.869 --> 00:57.590
it merely wants the 30 bridge owners to
evaluate whether they are above acceptable risk
00:57.590 --> 00:59.790
levels.
If the risk level is high.
01:00.220 --> 01:05.480
The NTSB wants the owners to develop and
implement a comprehensive risk reduction plan.
01:05.690 --> 01:11.169
AS2 created vulnerability assessment
calculations for new bridges in 1991 in
01:11.169 --> 01:14.480
response to the Sunshine Skyway bridge collapse
in Florida.
01:14.839 --> 01:19.970
Since 1994, the Federal Highway Administration
has required new bridges to be designed to
01:19.970 --> 01:24.050
minimize the risk of a catastrophic bridge
collapse from a vessel collision.
01:24.529 --> 01:29.510
The NTSB found that had the Maryland
Transportation Authority conducted a
01:29.510 --> 01:34.910
vulnerability assessment on the Key Bridge, it
could have been proactive in reducing the
01:34.910 --> 01:36.739
bridge's risk of collapse.
01:37.029 --> 01:41.949
Neither the FHWA nor Ash to can require a
bridge owner to complete a vulnerability
01:41.949 --> 01:46.319
assessment for a bridge designed before the
release of the 1991 guidelines.
01:46.510 --> 01:50.150
The full list included below has some pretty
notable structures,
01:50.430 --> 01:53.150
including the Golden Gate Bridge in California
built in 19.
01:53.273 --> 01:57.443
37, the Sunshine Skyway Bridge in Florida,
built in 1986.
01:57.612 --> 02:02.513
The Talmadge Bridge in Georgia built in 191.
The Leo Frego Bridge in Green Bay,
02:02.532 --> 02:08.042
Wisconsin built in 1979 in Chicago's Skyway
Bridge built in 1958.
02:08.263 --> 02:11.533
New York topped the list with 13 bridges,
including the Brooklyn Bridge,
02:11.542 --> 02:16.035
which was built in 1883, as well as the.
Manhattan and Williamsburg bridges.
02:16.195 --> 02:20.615
Louisiana had the 2nd most with 8 and 7 bridges
were flagged in California.
02:20.785 --> 02:25.425
The NTSB has recommended that an
interdisciplinary team of experts be
02:25.425 --> 02:29.945
established to provide guidance and assistance
to bridge owners on evaluating and reducing the
02:29.945 --> 02:35.175
risk, which could mean infrastructure
improvements or operational changes.
02:35.466 --> 02:37.945
I'm David Manti.
This is manufacturing now.
