Francis Scott Key Bridge Collapse: Facts and Business Impact

The Francis Scott Key Bridge in Baltimore collapsed early on March 26, 2024, after the containership Dali lost power and struck a main support pier. Six highway workers died. The NTSB later traced the blackout to a loose wire connection. The shipping channel fully reopened in June 2024, and a replacement bridge is expected around late 2030.

Key takeaways

  • The Dali lost electrical power, propulsion and steering shortly before striking Pier 17.
  • Six members of a highway maintenance crew were killed; one worker survived with serious injuries.
  • The NTSB cited a loose signal wire, missing bridge protection and the lack of a fast warning system.
  • The Fort McHenry federal channel returned to full dimensions on June 10, 2024.

What happened to the Key Bridge?

According to the National Transportation Safety Board (NTSB), at about 1:29 a.m. local time on March 26, 2024, the Singapore-flagged containership Dali was leaving Baltimore Harbor when it lost electrical power, propulsion and steering. The vessel struck Pier 17, which supported the bridge's central span, and much of the bridge fell into the Patapsco River. Debris landed on the ship's bow and forward container bays.

Six highway workers on the bridge were killed. One highway worker survived with serious injuries, and a bridge inspector on the bridge was unharmed. One of the 23 people aboard the Dali suffered a minor injury. The NTSB reported damage to the vessel exceeding $18 million.

What did the NTSB investigation find?

The NTSB held a public board meeting on November 18, 2025, to determine probable cause and issued new safety recommendations, four of them urgent. The board found that the contact was caused by a blackout resulting from a loose signal wire connection to a terminal block, which was traced to improperly installed wire-label banding. That led to the loss of propulsion and steering close to the bridge, and the short distance left the crew little time to recover.

The NTSB also identified two factors that contributed to the collapse and loss of life:

  • The lack of bridge vulnerability countermeasures (such as pier protection), which a vulnerability assessment could have identified.
  • The lack of effective, immediate communication to warn highway workers on the bridge to evacuate.

How did the collapse affect the Port of Baltimore and supply chains?

The wreckage blocked the Fort McHenry federal channel, the main shipping route into the Port of Baltimore. The U.S. Army Corps of Engineers (USACE) and the U.S. Navy Supervisor of Salvage and Diving cleared about 50,000 tons of bridge wreckage. The Dali was moved on May 20, 2024, and a limited access channel was widened to 400 feet the next day. On June 10, 2024, USACE announced the channel had been restored to its original operational dimensions of 700 feet wide and 50 feet deep.

During the closure, shippers, importers and trucking firms rerouted cargo to other East Coast ports, and road traffic that used the bridge (part of Interstate 695) shifted to other crossings. Businesses dependent on the port faced delays, added transport costs and uncertain staffing for port-related jobs.

What is the current status of the rebuild?

The Maryland Transportation Authority (MDTA) is managing the replacement bridge under a progressive design-build contract. In November 2025, MDTA updates reported in the news placed the estimated cost between $4.3 billion and $5.2 billion, with opening expected in late 2030. Schedules and estimates for large infrastructure projects often change, so businesses planning around the crossing should check MDTA updates directly.

What does this mean for business decision makers?

The Key Bridge collapse is a reminder that a single physical asset can disrupt logistics, commuting and workforce plans across a region. Practical steps for employers:

AreaQuestion to askAction
Supply chainWhich suppliers or routes rely on a single port, bridge or tunnel?Identify alternates and build them into contracts
WorkforceHow would employees commute if a key crossing closed?Plan flexible shifts, remote options and transport support
Worker safetyCan we warn staff working near hazards within seconds?Test emergency alerting and evacuation for field crews
InsuranceDoes our policy cover business interruption from off-site events?Review contingent business interruption coverage
DataDo we have visibility into shipments in transit?Improve tracking and supplier reporting

The NTSB's finding on worker warnings is especially relevant to employers with crews on roads, sites or warehouses. Our guide to dealing with warehouse hazards covers hazard communication basics. For coverage questions, see what to check when buying or renewing insurance, and for shipment visibility, our piece on how big data analytics improves enterprise decisions.

Frequently Asked Questions

What caused the Francis Scott Key Bridge collapse?

The NTSB determined that the Dali suffered a blackout caused by a loose signal wire connection at a terminal block, linked to improperly installed wire-label banding. The ship lost propulsion and steering near the bridge and struck Pier 17. Missing pier protection and the lack of a fast warning to highway workers contributed to the collapse and deaths.

When did the Port of Baltimore shipping channel reopen?

The Fort McHenry federal channel was fully restored to 700 feet wide and 50 feet deep on June 10, 2024, according to the U.S. Army Corps of Engineers. Before that, limited access channels allowed some vessel traffic. Removal of steel below the riverbed continued afterward as routine maintenance to protect future dredging.

When will the new Key Bridge open?

As of reporting in November 2025, the Maryland Transportation Authority expected the replacement bridge to open in late 2030, with an estimated cost of $4.3 billion to $5.2 billion. Large infrastructure timelines often shift, so check the MDTA's Key Bridge rebuild updates for the latest schedule.

Next steps

  1. List single points of failure in your logistics and commuting routes.
  2. Test how quickly you can alert and evacuate field employees.
  3. Review business interruption and contingent coverage with your broker.
  4. Follow MDTA updates if your operations depend on the crossing.

Last reviewed: October 2026.

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