The National Transportation Safety Board (NTSB) has revealed that the March 2024 collapse of Baltimore’s Francis Scott Key Bridge was caused by an improperly installed wire label. This mistake triggered electrical failures aboard the containership Dali as it neared the bridge, leading to the tragic loss of six highway workers. The NTSB’s final report, released after a recent board meeting, identifies the incident’s root cause as a blackout due to a loose signal wire connection, resulting in the vessel losing propulsion and steering just before the collision.
The 984-foot Dali struck Pier 17, collapsing a significant part of the bridge onto its bow and cargo area. The damage to the ship was estimated at over $18 million, while costs to replace the bridge are projected between $4.3 billion and $5.2 billion, with completion not anticipated until late 2030. In addition to the lost lives, one worker sustained serious injuries, and an inspector escaped unharmed. The NTSB noted that the crew’s response time was limited due to the Dali’s proximity to the bridge at the time of the incident.
Investigators also highlighted significant infrastructure vulnerabilities and communication breakdowns that exacerbated the tragedy. They called for urgent safety recommendations, urging various federal agencies to collaborate on minimizing vessel collision risks for bridges. Furthermore, the Coast Guard was prompted to assess redundant systems for large vessels and improve safety management standards. As a result of the bridge collapse, over 34,000 vehicles daily are rerouted, causing considerable economic disruption for the Port of Baltimore and the surrounding area. This incident serves as a sobering reminder of how minor mechanical issues can lead to devastating outcomes when infrastructure lacks proper safeguards.
