A prison barge is a vessel, either converted from an existing ship or purpose-built, that functions as a floating jail or detention facility. Governments deploy them when land-based prisons fill up and new construction cannot keep pace, mooring the vessel at a dock and housing inmates or detainees aboard. The most prominent modern example, New York City’s Vernon C. Bain Correctional Center, held up to 800 people in the East River for more than thirty years before it was decommissioned in 2023.
Why Governments Use Them
Every modern prison barge shares the same origin story: an overcrowding crisis and a need for beds faster than a building can be designed, permitted, and constructed. The Vernon C. Bain Center was towed to the Bronx in 1992 because Rikers Island was overflowing. The United Kingdom’s Bibby Stockholm was deployed in 2023 because the country’s asylum processing backlog had left thousands of people in expensive hotel accommodations. The Netherlands began housing asylum seekers on floating vessels in Rotterdam in 2005 during a surge in applications.
The appeal is speed and flexibility. A barge can be towed into position and begin receiving detainees sooner than a new facility can be built. In cities where land is scarce and every proposed jail site faces community opposition, a vessel moored offshore sidesteps the most contentious parts of the siting process. Barges also arrive with an implicit promise that they are temporary. The Vernon C. Bain Center’s 31-year run as a “temporary” facility is the clearest evidence of how that promise tends to play out.
How a Prison Barge Is Built
Modern prison barges bear little resemblance to the stripped-down warships (“hulks”) that Britain used as floating prisons in the late 1700s. At least one notable modern example, the Vernon C. Bain Center, was constructed specifically as a detention facility rather than converted from another vessel.
The internal layout resembles a compressed version of a land-based jail. The Vernon C. Bain Center included cell blocks, dormitory-style housing, medical facilities, kitchens, and recreation areas spread across multiple decks. Reinforced structures and limited external access points made escape effectively impossible, and the surrounding water acted as a natural perimeter that land-based facilities have to replicate with fences, walls, and buffer zones.
The confined nature of a ship forces design compromises. Outdoor recreation space is minimal compared to a jail on land. Ventilation systems have to work harder in enclosed metal structures. Plumbing and waste management are more complex because they operate on water rather than connecting to municipal infrastructure. These constraints create conditions that differ significantly from what inmates experience on land, and they are a persistent source of criticism.
How Prison Barges Operate
Running a correctional facility on water involves all the challenges of a regular jail plus a set of problems unique to maritime settings.
Security and Staffing
Perimeter security relies on the water itself as the primary barrier, supplemented by physical barriers, surveillance cameras, and electronic monitoring. Inmate movement is tightly controlled because corridors are narrower and common areas smaller than in land-based facilities, which means minor disruptions can escalate quickly.
Staffing typically includes both correctional officers and a maritime crew. The U.S. Coast Guard has issued guidance on inspection and compliance requirements for floating correctional facilities, and the vessel’s classification determines what crew certifications are needed. A barge that is permanently moored with no propulsion system faces different requirements than one capable of movement.
Logistics and Supply
Everything consumed or used aboard a prison barge arrives by boat or across a gangway, from food and medical supplies to clean linens and mail. Waste removal follows the same route in reverse. That creates a supply chain vulnerability land-based facilities do not have. Bad weather, mechanical failures on supply boats, or dock damage can disrupt operations in ways a jail connected to roads would never face.
Sanitation and Water Systems
Large vessels housing hundreds of people generate significant wastewater. Non-recreational vessels 79 feet and longer must comply with discharge requirements under the EPA’s Vessel General Permit program, which covers pollutant discharges incidental to normal vessel operation. Until new regulations under the Vessel Incidental Discharge Act become fully enforceable, the existing 2013 permit requirements remain in effect.
Complex plumbing on stationary vessels is also vulnerable to bacterial contamination when water sits stagnant in pipes, a problem the CDC has flagged specifically in its guidance for large vessels. The CDC recommends comprehensive water management programs, including regular flushing of all outlets, temperature monitoring, and cleaning protocols for any systems that have been idle or operating at reduced capacity.
Cost
Prison barges are expensive to run. The Vernon C. Bain Center reportedly cost around $24 million per year to operate for its 800-bed capacity, roughly $82 per bed per day in operating costs alone, before the capital cost of building the barge itself. Specialized maintenance including hull inspections, marine engineering, and dock fees adds expenses that land-based jails avoid entirely. The appeal has never been that barges are cheap. It is that they can be deployed faster than a new jail can be built.
Conditions Aboard
The track record on living conditions aboard modern prison barges is poor, and this is where the concept draws its heaviest criticism.
Waterborne Disease
Stagnant water in pipes creates conditions that promote Legionella growth by reducing water temperatures into the bacteria’s preferred range, encouraging biofilm, and lowering disinfectant levels. This is not a theoretical risk. When the UK placed asylum seekers aboard the Bibby Stockholm in August 2023, Legionella bacteria were detected in the onboard water system within days. All 39 residents were evacuated as a precaution. Testing confirmed the contamination was limited to the vessel’s internal plumbing rather than the incoming water supply, meaning the barge itself was the source.
Documented Complaints
Detainees on the Vernon C. Bain Center described sweltering heat in summer, bitter cold in winter, and mouse droppings found in food. Getting medical attention was a documented struggle. In at least one case, other inmates had to start a disturbance, including setting a small fire, before staff took a seriously ill detainee’s condition seriously. Conditions reportedly deteriorated as the facility aged.
Residents of the Bibby Stockholm reported similar themes despite the vessel being in better physical condition. They described the experience as feeling like prison, with security screenings required each time they wanted to access the small outdoor yard, which was enclosed by high fences. The interior felt cramped. One resident estimated the realistic capacity at around 120 people, well below the 400 to 500 the government placed aboard. Advocates documented significant deterioration in residents’ mental health, including severe anxiety.
Notable Modern Examples
Vernon C. Bain Correctional Center (New York City)
The Vernon C. Bain Center arrived in the Bronx in 1992 as a temporary measure to reduce overcrowding at Rikers Island. It held up to 800 detainees, most of them awaiting trial rather than serving sentences. It was believed to be the last operating prison ship in the United States when New York City decommissioned it in 2023. In 2025, the city announced plans to permanently remove the barge from its Hunts Point location as part of its broader commitment to closing Rikers Island, framing the removal as both a correctional reform and an environmental justice measure for a neighborhood that had long borne the burden of carceral infrastructure.
Bibby Stockholm (United Kingdom)
The Bibby Stockholm was a 93-meter accommodation barge the UK’s Conservative government deployed at Portland Port in Dorset in July 2023 to house asylum seekers. It was the first time the UK had used a barge for that purpose. The vessel accommodated around 400 people at a time, all single adult men between 18 and 65. The first residents boarded on August 7, 2023, and the final group departed on November 26, 2024, after the incoming Labour government decided not to renew the contract. The barge was handed back to its owner, Bibby Marine, in January 2025 for dismantling. The vessel had previously served as homeless accommodation in Hamburg, Germany, during the late 1990s.
The Netherlands
The Netherlands housed asylum seekers on floating vessels in Rotterdam starting in 2005. These detention barges developed a troubled reputation for poor healthcare and inadequate services, reportedly triggering hunger strikes and disturbances among detainees.
A Brief Historical Note
The idea of a floating prison is centuries old. Britain’s widespread use of prison ships began in the late 1700s, when the American Revolution closed off its ability to transport convicts to its North American colonies. Decommissioned warships and merchant vessels were stripped of their masts and anchored in harbors as overflow detention, where they became known as hulks. Parliament intended them as a temporary fix; they remained in use for nearly a century. Conditions were brutal, with roughly a third of prisoners dying in the early years from cholera, dysentery, and typhus. The term “prison barge” today usually refers to the modern facilities above rather than these historical hulks, but the underlying pattern is the same: governments reach for floating facilities when they have run out of room and run out of time.