A jack-up rig is a vessel — and that holds even when its legs are on the bottom.
A jack-up is towed or sails to location, then lifts its hull out of the water on legs planted in the seabed. It is still a vessel — which usually makes its crew Jones Act seamen, even elevated.
Is a jack-up rig a vessel, and am I a Jones Act seaman on it?
Generally yes. A jack-up rig is built to move between locations, and remains a vessel even when its legs are down on the seabed, which usually makes its crew Jones Act seamen. As a seaman you can sue your employer for negligence under the Jones Act, bring an unseaworthiness claim, and receive maintenance and cure.
Key takeaways
- A jack-up rig is generally treated as a vessel.
- That usually makes its crew Jones Act seamen.
- Seamen get Jones Act negligence, unseaworthiness, and maintenance and cure.
- The Jones Act needs only a light showing of fault; unseaworthiness needs none.
- Status can still be contested, so the specific assignment matters.
A rig that stands on its own legs.
A jack-up rig is a mobile offshore drilling unit with a floating hull and long lowerable legs. It is towed or self-propelled to location, then jacks the hull up the legs and out of the water, resting on footings (spudcans) planted on the seabed. Jack-ups work the continental shelf and shallower water worldwide.
The crew is the same mix as any MODU — marine crew, drilling crew, and contractors — and the same Jones Act analysis applies, because the unit remains a vessel.
The injuries this work produces.
Jack-ups carry signature failure modes that other units do not: leg failure and punch-through, where a leg suddenly drives into soft or uneven seabed and the hull lurches; jacking-system failures during raising or lowering; and, in the worst cases, collapse or toppling during installation, moves, or storms. Layered on top are the ordinary drill-floor, pipe-handling, falls, crush, and lifting hazards. A jacking or leg event can injure an entire crew at once.
A vessel — so the Jones Act applies.
Under Stewart v. Dutra Construction Co., 543 U.S. 481 (2005), any watercraft practically capable of moving on water is a “vessel” — and a jack-up rig qualifies. That status is the gateway to the strongest remedies in maritime law.
A worker assigned to the jack-up rig whose duties contribute to its mission, with a connection substantial in nature and duration (the Sanchez / Chandris test), is a Jones Act seaman — with a negligence claim against the employer.
That seaman also has a no-fault unseaworthiness claim if the vessel, its gear, or its crew was not reasonably fit for its purpose.
A service-company or contract worker aboard who is not a crew member can instead sue the vessel for negligence under § 905(b).
Defendants sometimes argue a jack-up is not “in navigation” while its legs are planted and the hull is elevated. Courts have generally continued to treat jack-ups as vessels, but the point is fact-specific and worth litigating carefully.
On a jack-up, the defense's argument is usually that it wasn't “in navigation” while elevated — a point that can be met.
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Text (713) 489-2297We've litigated the classification fight.
Doyle Dennis Avery tries the cases where the classification is the battle. In the Bermuda forum-maneuver case, a drillship mechanic's case was kept in Texas; in our seaman-status workboat case, a workboat injury was built across the Jones Act, § 905(b), and general maritime law; in our foreign-employer jurisdiction case, a contractor's fall offshore was pursued to recovery.
If you were hurt on this kind of unit, the first job is to establish what it is, who you were to it, and who else was responsible. That early work is what protects the value of the claim.
What the other side will argue — and how it’s met.
A jack-up is a vessel, but the defense will seize on its legs being down on the seabed to argue it was a fixed structure when you were hurt.
For floating, movable units the defense argues the structure is a fixed facility outside maritime law. Vessel status is a fact question — a structure practically capable of maritime transportation is a vessel — and winning it brings the Jones Act and unseaworthy doctrine to bear instead of a narrower premises regime.
On a vessel the fight is rarely whether it is a vessel — it is whether you were its crew. Seaman status turns on a connection to the vessel or fleet that is substantial in nature and duration (Chandris and Sanchez, roughly 30% of your time) and is provable through assignment and time records. Establishing it opens the full Jones Act and unseaworthy-vessel recovery.
The Jones Act uses pure comparative negligence, so a worker’s own fault reduces a recovery but never bars it — and the hazard is usually the company’s. In one case the firm tried, a jury found the injured worker zero percent at fault.
A worker does not need to prove unseaworthiness to win. Employer negligence under the Jones Act stands on its own — a jury can find negligence even where it does not find the vessel unseaworthy.
A jack-up case can turn on whether it was a vessel that day.
A jack-up floats, is towed, and jacks up on legs at the wellsite — so vessel status is usually clear but can be contested once it is elevated and working. The firm proves the unit’s vessel character and the worker’s connection to it, then reconstructs the jacking, drilling, or deck hazard with a marine-safety expert. If the Jones Act applies, the operator and the drilling contractor answer for negligence and unseaworthy; if a platform regime is argued, the firm litigates that line directly.
A jack-up does not stop being a vessel because its legs are down — but that is exactly the argument you should expect.
What to protect while it still exists.
The unit’s status, your role, and the hazard records are the case, and the defense will frame all three.
Preserve records of the unit’s operations and movement, your assignment and time history, and the equipment involved — they establish vessel status and the negligence claim alike.
Tell a supervisor and make sure a written incident report is created. For a serious injury the vessel must also file a Coast Guard marine-casualty report (Form CG‑2692); a missing report is itself evidence of a safety failure.
See a doctor promptly and describe exactly how the injury happened to every provider. An honest, contemporaneous record is the backbone of the case.
You are not required to give the insurer a recorded statement, and early “I’m okay” remarks get used against you. Assume you may be watched, and get advice before signing.
From our cases
Frequently asked questions about a jack-up rig injury claims
Is a jack-up rig a vessel?
Generally yes. A jack-up rig is built to move between locations, and remains a vessel even when its legs are down on the seabed, so courts usually treat it as a vessel for Jones Act purposes.
Am I a Jones Act seaman if I work on a jack-up rig?
Usually. If you have a substantial connection to a jack-up rig in both duration and nature, you are typically a Jones Act seaman, able to sue the employer for negligence and claim unseaworthiness and maintenance and cure.
What is the test for whether something is a vessel?
Courts ask whether the structure is practically capable of being used as a means of transportation on water. Something built to move, such as a drillship or supply vessel, usually qualifies; something fixed to the seabed or permanently moored in place usually does not.
Do I have to prove my employer was at fault?
Not entirely. Under the Jones Act you need only show the employer's negligence played some part, however slight, which is a very worker-friendly standard. An unseaworthiness claim requires no negligence at all, only that the vessel or its equipment was not reasonably fit. Maintenance and cure is owed to a seaman regardless of fault.
What can I recover after an injury on a jack-up rig?
Recovery is measured by category rather than a fixed amount: past and future medical care, lost wages and lost earning capacity, pain and suffering, and maintenance and cure for a seaman. The total depends on the facts, so no honest lawyer can promise a number up front.
What is maintenance and cure?
Maintenance and cure is a no-fault maritime benefit owed to an injured seaman: maintenance covers daily living expenses and cure covers medical care, until you reach maximum medical improvement, regardless of who was at fault.
What should you do after an injury on a jack-up rig?
Get medical care and make sure the injury is reported in writing. Preserve evidence early, including incident reports, photos, equipment, and witness names, and do not give a recorded statement or sign anything before talking to a lawyer.
What happens when you text us
Tell us what happened — in your own words, as much or as little as you want.
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Reach out even if…
- You think the accident was partly your fault — under the Jones Act, your own fault reduces a recovery but does not bar it.
- You already gave a statement or signed something — a release signed under pressure can be challenged.
- You still work for the company — talking to a lawyer is confidential, and retaliation for pursuing a claim can itself be actionable.
- You’re not sure your case is “big enough” — that’s exactly what a free review is for.
What you were working on shapes your claim.
Doyle Dennis Avery LLP represents offshore workers injured on drillships, semi-submersibles, jack-ups, FPSOs, platforms, and the supply, service, and construction vessels that serve them. Tell us what you were on and what happened — a case review costs nothing, and there is no obligation.
This page is general information, not legal advice, and does not create an attorney-client relationship. Whether a worker is a Jones Act seaman, an LHWCA harbor worker with a § 905(b) claim, or covered another way depends on the specific facts, including the structure involved and the worker’s connection to it. Vessel status and seaman status are fact-intensive questions. Prior results do not guarantee or predict a similar outcome. Doyle Dennis Avery LLP · Houston, Texas. This is attorney advertising.
