United States: Amid heightened concerns over structural integrity, Michigan’s Mackinac Bridge finds itself among an assemblage of 68 bridges across the nation flagged by the National Transportation Safety Board (NTSB) for comprehensive risk evaluations. These assessments are intended to ascertain their susceptibility to catastrophic failure in the event of maritime impact.
The NTSB’s advisory follows the devastating collapse of Baltimore’s Francis Scott Key Bridge last year, a tragedy that underscored the latent dangers posed to crucial infrastructures. In response, the agency has compiled an extensive registry of bridges necessitating a rigorous “vulnerability assessment” to determine their resilience against vessel collisions, according to CBS News.
Within this index, the 68 bridges are bifurcated into two classifications: “critical/essential” and “typical.” Structures designated as “critical/essential” fulfill an indispensable role in regional connectivity, akin to the Francis Scott Key Bridge, which had been classified under this category.
The popular Mackinac Bridge connecting the lower and upper peninsulas of Michigan is among the dozens of bridges the NTSB recommends be evaluated to assess its risk of collapse. https://t.co/soBkeNI2Ka
— CBS Detroit (@CBSDetroit) March 21, 2025
However, the NTSB has explicitly stated that inclusion in this list does not equate to an imminent risk of collapse. Instead, the agency urges bridge custodians to undertake exhaustive evaluations to ensure their structures align with the safety thresholds stipulated by the American Association of State Highway and Transportation Officials (AASHTO).
Among the bridges identified for scrutiny alongside the Mackinac Bridge are iconic landmarks such as California’s Golden Gate Bridge, New York’s Brooklyn Bridge, and the Chicago Skyway, each of which serves as a vital artery for transportation, as per reports by CBS News.
Commissioned in 1957, the Mackinac Bridge is a crucial conduit linking Michigan’s lower and upper peninsulas. Spanning an impressive five miles, it ranks as the seventh-longest suspension bridge globally, further amplifying its infrastructural significance.
In an unrelated development, the Mackinac Bridge Authority sanctioned the imposition of credit card convenience fees for toll transactions last year, a decision reflecting evolving financial policies in bridge operations.