A newly released engineering report has assessed whether the Golden Gate Bridge could withstand the same catastrophic circumstances that led to the collapse of the Francis Scott Key Bridge in Baltimore. The 206-page analysis, published on March 24, examined the durability of the iconic San Francisco landmark and found it to be remarkably secure, despite being nearly a century old.
Background of the Study
The report was commissioned following the devastating Baltimore bridge collapse on March 26, 2024, when a cargo ship suffered a power outage and crashed into one of the Key Bridge's support columns. The impact caused the entire structure to collapse, tragically killing six construction workers. In response, engineers modeled worst-case scenarios for the Golden Gate Bridge, including a vessel striking the bridge at speed and hitting its support systems.
Key Findings
The analysis, cited by the San Francisco Chronicle, revealed that the Golden Gate Bridge was designed with multiple defense mechanisms that make a collapse highly unlikely. The report estimates the odds of the bridge collapsing due to a ship strike are between 1 in 40,000 and 1 in 70,000 in a typical year. This probability is at least four times lower than the current standard for bridge safety.
Engineers noted that the bridge's weakest point is its north tower, which lacks a 28-foot-thick concrete fender that protects the stronger south tower. Additionally, the north tower sits in deeper water, while the south tower is in such shallow water that any large vessel would likely bottom out before reaching it. The report concluded that it would take an extremely rare scenario—a ship traveling off course through natural barriers with enough power—to bring the bridge down.
Comparison with Baltimore Bridge
An investigation by the National Transportation Safety Board (NTSB) found that the risk to the Francis Scott Key Bridge was about 30 times the industry-accepted level. The NTSB has since identified 68 bridges in the US that require risk assessments to determine if they meet acceptable criteria. Engineers explained to the Daily Mail in 2024 that the Baltimore bridge, while not inherently unsafe, had a 'flimsy' structure that made it prone to collapse if its supports were damaged.
Only about 25 ships large enough to cause damage pass under the Golden Gate Bridge daily, and they navigate a nearly mile-wide gap, rarely needing to squeeze past other vessels. This further reduces the likelihood of a collision.
Conclusion
The report underscores the Golden Gate Bridge's exceptional safety record, far exceeding modern standards. While no structure is entirely risk-free, the bridge's design and operational environment make a collapse scenario extremely improbable.
