Portland Harbor boat fire damages Custom House Wharf waterfront businesses; investigators begin determining cause and losses

Crews battle three-alarm waterfront fire in Portland Harbor

Emergency crews responded to a significant boat-and-structure fire on Portland Harbor’s working waterfront on the evening of December 26, 2025, as flames spread along Custom House Wharf in the city’s Old Port area. The incident drew a third-alarm response and prompted public warnings to avoid the surrounding Commercial Street corridor while firefighters worked to contain the blaze.

Officials reported that the fire was visible from multiple vantage points across the harbor and that access challenges on the narrow, icy wharf complicated operations. Firefighters also faced water-supply constraints in freezing conditions, leading to the deployment of a fireboat to deliver sustained streams from the harbor side.

Damage to businesses and vessels; injuries reported

The fire caused extensive damage to several aging waterfront structures and affected multiple businesses located along Custom House Wharf, a cluster of commercial spaces that includes restaurants, shops, and maritime services. In the early damage assessments released in the days following the fire, several businesses were described as total losses, while others sustained smoke, fire, and structural damage, including reports of roof collapse in at least one area.

Multiple vessels moored alongside the wharf were impacted. Authorities confirmed that several boats were damaged and that at least one vessel sank during or after the fire. Fire officials also reported injuries among responders, described as minor, during the operation.

• Incident: Three-alarm fire at Custom House Wharf, Portland Harbor (Old Port waterfront)
• Timing: Evening of December 26, 2025; crews remained on scene into the following day
• Impacts: Multiple businesses damaged; at least one boat sank; minor firefighter injuries reported
• Operations: Fireboat used to support suppression from the water due to winter conditions and access limitations

Investigation underway; officials say cause not yet determined

Investigators began examining the scene the next day, with officials indicating the inquiry could take time given the extent of damage and the hazards typical of waterfront fire scenes, including compromised utilities and unstable structures. In preliminary statements, officials said they did not suspect foul play at that stage, while emphasizing that the cause had not been determined.

Fire officials described the response as logistically difficult due to access constraints on the wharf and winter conditions, and said harbor-based firefighting resources helped limit spread.

Why the harbor response mattered

Waterfront fires can escalate quickly when structures are closely spaced and when wind, cold-weather water-supply limitations, and restricted apparatus access converge. In this incident, crews relied on coordinated land-based and marine suppression to attack the fire from multiple angles, an approach officials said helped bring the blaze under control within hours and reduced the likelihood of further spread along the waterfront.

As the investigation continues, city agencies and business owners are expected to move from emergency response into damage documentation and recovery planning. Officials have not released a final estimate of losses or a definitive origin and cause determination.