When the Dali containership struck Baltimore's Francis Scott Key Bridge on 26 March 2024, the consequences were immediate and devastating.
The bridge collapsed within seconds, six construction workers lost their lives and access to one of the United States' most significant ports was disrupted.
For the insurance and reinsurance industry, another question quickly emerged: how large would the resulting loss become?
Initial estimates varied considerably. More than two years later, the development of the Baltimore Bridge loss provides a much clearer picture – and an important case study in how a single event can create exposures across multiple insurance classes, organisations and layers of reinsurance.
How large was the Baltimore Bridge insurance loss?
Early market estimates suggested insured losses from the Baltimore Bridge collapse could reach approximately $1.5 billion.
As claims developed and the wider liabilities associated with the incident became clearer, however, estimates increased significantly.
By 2026, market disclosures indicated an insured loss exceeding $2.8 billion, incorporating areas such as bridge reconstruction, wreck removal, pollution, lost toll revenues and other liabilities arising from the incident.
At that level, the collapse could surpass the estimated $1.6 billion loss associated with the Costa Concordia disaster in 2012, making Baltimore the largest individual marine insurance loss on record.
The development demonstrates one of the challenges facing insurers and reinsurers following complex events: the ultimate cost of a loss may only become apparent as individual exposures, liabilities and claims emerge over time.
A marine loss with much wider consequences
Although the incident originated with a containership, its insurance implications extended considerably further than damage to the vessel itself.
The collapse created potential exposures spanning:
- Marine liability
- Property and infrastructure damage
- Wreck and debris removal
- Cargo
- Pollution and clean-up
- Business interruption
- Port operations
- Supply-chain disruption
- Casualty and liability claims
- Government expenditure
Baltimore therefore provides a powerful example of how modern marine risks can extend far beyond the vessel itself.
Increasing vessel sizes, highly connected supply chains and the interaction between maritime operations and critical infrastructure can create concentrations of risk that cross traditional insurance boundaries.
These changing dynamics are explored further in our Marine Hull whitepaper, which examines the evolving marine risk landscape and how technology and automation are changing the way insurers and reinsurers respond.
How did the loss reach the reinsurance market?
The Dali was entered with Britannia P&I Club, one of the members of the International Group of P&I Clubs.
The International Group enables its member clubs to pool major shipping liabilities before transferring higher layers of exposure into the global reinsurance market.
For a loss on the scale of Baltimore, this structure became particularly significant.
By 2026, the estimated $2.8 billion insured loss represented close to 93% of the International Group's $3 billion general excess-of-loss reinsurance tower, according to Howden Re.
The result was that an incident involving one vessel and one bridge ultimately became a substantial global reinsurance event.
It also demonstrates the fundamental purpose of reinsurance: distributing extremely large and potentially volatile losses across a broader pool of capital rather than allowing the financial impact to remain concentrated with a single insurer.
What happened after the Baltimore Bridge collapse?
The insurance story continued developing long after the Port of Baltimore reopened.
In October 2024, the US government reached a settlement of almost $102 million with the owner and operator of the Dali to recover costs associated with clearing the shipping channel and restoring access to the port.
Importantly, that settlement did not include the cost of reconstructing the Francis Scott Key Bridge.
Further claims followed.
In May 2026, the State of Maryland announced a $2.25 billion settlement with Grace Ocean Private Limited and Synergy Marine, the vessel's owner and operator, resolving the state's claims arising from the collapse.
Additional litigation and settlements involving businesses, insurers and the families of those killed have demonstrated the potentially long claims tail associated with a major marine casualty.
For insurers and reinsurers, this creates another challenge: understanding an event is not simply about assessing its immediate physical damage. Claims can continue developing months or even years afterwards.
What caused the Dali to hit the bridge?
The investigation has also provided greater clarity around the circumstances leading to the collision.
In November 2025, the US National Transportation Safety Board concluded that the probable cause of the Dali striking the Francis Scott Key Bridge was a loss of electrical power caused by a loose signal wire connection.
The resulting power failure caused the vessel to lose propulsion and steering at a critical point in its journey.
The NTSB also identified the vulnerability of the bridge to impact from a large ocean-going vessel as a contributing factor in the scale of the disaster.
The findings prompted a much wider examination of US infrastructure.
As part of its investigation, the NTSB recommended vulnerability assessments for 68 bridges across 19 states, highlighting how lessons from one major loss can influence risk management far beyond the original incident.
Baltimore and the challenge of accumulation risk
Perhaps one of the most important lessons from Baltimore for the reinsurance industry is the issue of accumulation risk.
One physical incident generated potential claims across marine, property, liability, casualty, infrastructure and business interruption – while also affecting supply chains, government bodies and commercial organisations.
For an insurer or reinsurer operating across several of those areas, seemingly separate policies can therefore become connected through a single event.
Identifying those relationships becomes particularly important when organisations are managing large and increasingly complex portfolios.
Baltimore also highlights a wider challenge around protection gaps. Not every financial consequence created by a major event necessarily falls neatly within traditional insurance structures, particularly where indirect losses and wider disruption are involved.
As the risk landscape changes, alternative approaches to risk transfer are attracting greater attention, including parametric and other non-traditional structures designed to respond differently to conventional indemnity insurance.
Our Parametric & Non-Traditional Risk whitepaper explores how these models are developing and the role they could play within increasingly sophisticated risk-transfer strategies.
Why data matters after a major insurance event
Baltimore also demonstrates the importance of data when managing complex losses.
Following a major event, insurers and reinsurers may need to determine which policies are affected, understand the relationships between different exposures, establish where liabilities sit and monitor how claims develop.
When information exists across disconnected systems, spreadsheets or manual processes, building that picture can become significantly more difficult.
Modern reinsurance technology can provide organisations with greater visibility across underwriting, claims, exposures and financial information, helping teams understand how an event affects their portfolio as it develops.
For large and interconnected losses, the ability to access reliable information quickly can become particularly valuable.
What can insurers and reinsurers learn from Baltimore?
Baltimore was an exceptional event, but the issues it exposed are increasingly familiar.
Global trade depends on interconnected infrastructure. Ships continue to grow larger. Supply chains cross multiple jurisdictions. Individual risks can interact with seemingly unrelated insurance classes.
For insurers and reinsurers, understanding these relationships is becoming an increasingly important part of managing exposure.
The Baltimore Bridge collapse ultimately developed from an individual marine casualty into an insured loss exceeding $2.8 billion and a significant test of the international marine reinsurance system.
More than two years later, its legacy extends beyond the final claims bill.
It provides a powerful reminder that the scale of a major insurance loss is not necessarily determined by the initial event, but by the network of exposures connected to it.
As risk becomes increasingly interconnected, having the data, technology and operational visibility to understand those connections will be critical to preparing for whatever comes next.
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