68 U.S. Bridges Lack Risk Assessment
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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