RANDALL, Circuit Judge:
This appeal presents two questions that have been frequently litigated in this Circuit: (1) what constitutes a “vessel” for Jones Act purposes and (2) under what circumstances can the issue of a structure’s status as a Jones Act vessel be removed from the trier of fact and decided as a matter of law? Robert Bernard (Bernard) sued his employer, Binnings Construction Company, Inc. (Binnings), under the Jones Act, 46 U.S.C. § 688, for injuries to his back allegedly sustained while Bernard was engaged in pile driving activities along the New Basin Canal near Lake Pontchartrain, Louisiana. At the time of the accident, Bernard was working from a small raft or “work punt” stationed alongside a piling that was being driven near the shore of the canal. The district court granted summary judgment dismissing Bernard’s suit on the ground that Bernard is not a Jones Act seaman, finding as a matter of law that the work punt upon which Bernard was working at the time of his injuries is not a vessel. The sole issue raised in this appeal is whether the district court erred in concluding that, as a matter of law, the work punt is not a Jones Act vessel. Finding no error in the district court’s conclusion, we affirm.
1. Factual Background.
The underlying facts are not in dispute.
At the time of Bernard’s injuries, Binnings was engaged in driving “sheet pilings”
for a condominium project located on the New Basin Canal. The New Basin Canal is a small canal used primarily by recreational
craft and is not large enough for commercial vessels. Bernard’s job consisted of guiding sheet pilings into place as they were lowered into position by men working from the shore. Bernard was sometimes required to break cement from around existing pilings in order to clear the way for new sheet pilings, a task he accomplished by swinging a flat-headed maul. He performed his duties from the water side of the pilings, while standing on a small raft or work punt.
Bernard maneuvered himself into the proper position to accomplish his work by paddling the work punt around the pilings.
At the time of his injuries, Bernard had been employed in this capacity for approximately three weeks and worked exclusively on the work punt during that period.
The work punt is a flat, iron platform measuring sixteen feet long by four feet wide, square at both ends, with a tank at each end and in the middle for buoyancy. It is eighteen inches deep and has no deck or crew quarters, no navigational lights and no means of self-propulsion other than the paddle that Bernard kept on board. The parties have stipulated that “ ‘[t]he work punt’ was used solely as a small platform from which to break the cement and guide the sheet pilings.” (Statement of Uncontested Material Facts No. 11).
Bernard injured his back when he fell while swinging a maul to clear cement from around an old piling. At the time of the fall, he was standing with one foot on the work punt and one foot on a brace connecting two pilings to which he was “tied.”
II. Contentions of the Parties.
Binnings moved for summary judgment on these undisputed facts, claiming that Bernard was not a seaman at the time of his injuries. Binnings’ position is premised on the proposition that, as a matter of law, the work punt is not a Jones Act vessel. The district court granted the motion for summary judgment and dismissed the case.
On appeal, Bernard relies on the familiar rule that Jones Act seaman status is generally determined by the trier of fact and that even marginal Jones Act claims should be submitted to the jury. Binnings, on the other hand, argues that the work punt’s primary function is to provide a work platform and that it therefore falls within that class of structures, analogous to floating dry docks, that we have held are not vessels as a matter of law.
III. The Applicable Law.
A. Is Summary Judgment Available on Seaman Status?
The benefits of the Jones Act
are available only if the claimant qualifies as a seaman. The burden of establishing seaman status is, of course, on the party claiming the benefits to be derived therefrom.
See, e.g., Billings v. Chevron, U.S.A., Inc.,
618 F.2d 1108, 1109 (5th Cir. 1980) (“In order to establish Jones Act .jurisdiction, plaintiff must show that at the time of his injury he was a seaman on a vessel____”). Although the Jones Act itself does not define the term seaman, the test of seaman status is firmly established by our decisions. Although the test has been phrased with slight variations from case to case,
it is clear that, in order to qualify for coverage under the Jones Act, a worker claiming seaman status must satisfy the following criteria:
(1) he must have a more or less permanent connection with (2) a vessel in navigation and (3) the capacity in which he is employed or the duties which he performs must contribute to the function of the vessel, the accomplishment of its mission or its operation or welfare in terms of its maintenance during its movement or during anchorage for its future trips.
Barrios v. Engine & Gas Compressor Services, Inc.,
669 F.2d 350, 352 (5th Cir.1982).
See also Watkins v. Pentzien, Inc.,
660 F.2d 604, 606 (5th Cir. 1981),
cert, denied,
456 U.S. 944,102 S.Ct. 2010, 72 L.Ed.2d 467 (1982).
Seaman status is ordinarily a question for the trier of fact.
Longmire v. Sea Drilling Corp.,
610 F.2d 1342, 1345 (5th Cir.1980).
As We said in
Offshore Co. v. Robison,
266 F.2d 769 (5th Cir.1959):
Even where the facts are largely undisputed, the question at issue [of seaman status] is not solely a question of law when, because of conflicting inferences that may lead to different conclusions among reasonable men, a trial judge cannot state an unvarying rule of law that fits the facts.
Id.
at 780. Therefore, we have long held that the question of seaman status should only be removed from the trier of fact (by summary judgment or directed verdict) in rare circumstances and that even marginal Jones Act claims should be submitted to the jury.
See, e.g., Leonard v. Exxon Corp.,
581 F.2d 522, 524 (5th Cir.1978),
cert, denied,
441 U.S. 923, 99 S.Ct. 2032, 60 L.Ed.2d 397 (1979) (“[Submission of
Jones Act claims to a jury requires a very low evidentiary threshold; even marginal claims are properly left for jury determination.”).
It is equally clear from our decisions, however, that the concern of
Robison
and its progeny, that seaman claims should ordinarily be decided by the trier of fact, does not automatically preclude summary judgment on the issue of Jones Act jurisdiction.
See, e.g., Thibodeaux v. J. Ray McDermott & Co.,
276 F.2d 42, 46 (5th Cir. 1960)
(Robison
does
not
“perforce make every case [of seaman status] one of fact for jury decision.”).
Summary judgment is proper on the question of seaman status where the underlying facts are undisputed and the record reveals no evidence from which reasonable persons might draw conflicting inferences on any of the elements of the seaman test.
Ardoin v. J. Ray McDermott & Co.,
641 F.2d at 280;
Stanley v. Guy Scroggins Construction Co.,
297 F.2d 374, 376 (5th Cir.1961). In other words, summary judgment on seaman status is proper “where the only rational inference to be drawn from the evidence is that the worker is not a seaman.”
Beard v. Shell Oil Co.,
606 F.2d 515, 517 (5th Cir.1979).
See also Owens v. Diamond M Drilling Co.,
487 F.2d 74, 76 (5th Cir.1973).
Where the facts upon which summary judgment on seaman status is based are, as here, undisputed, our job is to “review them to determine whether reasonable persons might draw conflicting inferences.”
Bertrand v. International Mooring & Marine, Inc.,
700 F.2d 240, 244 (5th Cir.1983),
cert, denied,
— U.S. -, 104 S.Ct. 974, 79 L.Ed.2d 212 (1984).
B. What is a Jones Act Vessel?
The existence of a vessel, as a fundamental prerequisite to Jones Act jurisdiction, is central to the test of seaman status. The term vessel has generally been defined broadly
and, in its traditional sense, refers to structures designed or utilized for
“transportation of passengers, cargo or equipment from place to place across navigable waters.”
Cook v. Belden Concrete Products, Inc.,
472 F.2d 999, 1002 (5th Cir.),
cert, denied,
414 U.S. 868, 94 S.Ct. 175, 38 L.Ed.2d 116 (1973).
See also
A. Sann, IB Benedict on Admiralty § 11a (7th ed. 1983) (“structure which carries cargo or passengers across the water”). We have been careful to note, however, that the term vessel is not capable of precise definition.
We have, for example, upheld determinations that a variety of special purpose structures, far removed from the conventional notion of ships and seagoing barges, are Jones Act vessels.
In evaluating a structure’s status, we consider “the purpose for which the craft is constructed and the business in which it is engaged.”
Blanchard v. Engine & Gas Compressor Services Inc.,
575 F.2d 1140, 1142 (5th Cir. 1978) (citing
The Robert W. Parsons,
191 U.S. 17, 30, 24 S.Ct. 8, 12, 48 L.Ed. 73 (1903)).
See also Hicks v. Ocean Drilling & Exploration,
512 F.2d at 817.
We note at the outset that the size of the structure,
its ability to float,
the permanence of its fixation to the shore or bottom,
and the fact of its movement or its capability of movement across navigable waters
are not conclusive of vessel status.
We note also that a structure whose purpose or primary business is
not
navigation or commerce across navigable waters may nonetheless satisfy the Jones Act’s vessel requirement if, at the time of the worker’s injury, the structure was actually engaged in navigation.
See, e.g., Blanchard v. Engine & Gas Compressor Services,
575 F.2d at 1143 n. 5 (building mounted on submerged barge not vessel as a matter of law, but “[o]ur holding might be different if Blanchard had been injured while the structures were being floated into position”);
Cook v. Belden Concrete Products,
472 F.2d at 1002 (“Although the floating construction platform was not designed for the purpose of navigation, the structure might be classified ás a vessel ... if at the time of appellant’s injury it had actually been engaged in navigation.”).
From these established principles of law, it appears that the district court’s summary judgment in this case was proper only if reasonable persons could not have concluded from the undisputed facts before the court that the work punt was designed or used primarily for the transportation of cargo, equipment or persons across navigable waters or was, at the time of Bernard’s injuries, engaged in navigation.
IV. The Work Punt’s Status.
Binnings argues that, except for its size, the work punt is indistinguishable
from the larger dry docks and work platforms we have previously found unqualified for Jones Act treatment. Bernard, on the other hand, argues that the work punt at least presents a marginal case for vessel status and that its character should be determined by the jury. Our decisions establish that dry docks and analagous structures whose primary purpose is to provide a work platform, even if the structures are afloat, are not Jones Act vessels as a matter of law.
We have not previously been called upon to apply these decisions to a small, raft-like structure, like the work punt involved in this appeal, that, although frequently moved around a work area, functions primarily as a work platform.
In
Atkins v. Greenville Shipbuilding,
411 F.2d at 279, we held that, for purposes of the maritime warranty of seaworthiness attaching to vessels in navigation,
a floating dry dock is not a vessel as a matter of law. Atkins was injured when a ladder slipped, causing him to fall to the dry dock’s floor. The dry dock was a “large flat surface,” floating on, but permanently affixed to the shore of, Lake Ferguson, Mississippi. It had no motive power and could only be moved by towing or by the application of other external force.
Id.
at 280. In affirming the district court’s summary judgment that the dry dock was not a vessel, we held that:
Mere flotation on water does not constitute a structure a “vessel” for purposes of salvage nor warranty of seaworthiness. The element of risk and exposure to the hazards of the sea, necessary for the operation of and common to both principles, is absent upon floating dry-docks.
Id.
at 283 (citing
Cope v. Vallette Dry-Dock Co.,
119 U.S. 625, 7 S.Ct. 336, 30 L.Ed. 501 (1887) (dry dock not a vessel for salvage purposes)).
See also Chahoc v. Hunt Shipyard,
431 F.2d 576, 577 (5th Cir.1970),
cert, denied,
401 U.S. 982, 91 S.Ct. 1198, 28 L.Ed.2d 333 (1971) (“[A] floating dry dock [is] not a ‘vessel’ while moored to the bank and operated as a dry dock.”). In
Keller v. Dravo Corp.,
441 F.2d 1239 (5th Cir.1971),
cert, denied,
404 U.S. 1017, 92 S.Ct. 679, 30 L.Ed.2d 665 (1972), we affirmed summary judgment that a floating dry dock
“moored and in use as a dry dock
” (emphasis in original) is not a vessel, in the face of conflicting affidavit evidence regarding whether the dock was equipped with navigational aids and the frequency with which it was moved across navigable waters.
Id.
at 1244. In a line of cases beginning with
Cook v. Bel-den Concrete Products,
472 F.2d at 999, we have extended that rationale, by analogy, to structures that lack the permanency of fixation to shore or the bottom that is common to dry docks, but nonetheless are used primarily as work platforms. The analogy to dry docks has been found suffi
ciently close to support determination of vessel status as a matter of law even in cases where the structures were moved across navigable waters on a fairly regular basis, but where their transportation function was purely incidental to their purpose of providing a work platform. For example, in
Cook
we affirmed a summary judgment dismissing Cook’s Jones Act suit against his employer for injuries sustained while working on a floating construction platform moored alongside the employer’s concrete yard. We found the construction platform “legally indistinguishable from a floating dry dock” and held that, as a matter of law, it was not a Jones Act vessel.
Id.
at 1000. The construction platform consisted of a flat-deck barge (180 feet long by 54 feet wide) secured to a dock by ropes. It lacked motive power and was moved, when necessary, by tug boats or land-based cranes. The platform was utilized as a station for the construction of concrete barges. Unlike a dry dock, however, it was “occasionally ... moved to different positions alongside the defendant’s dock to pick up materials” and was regularly towed a short distance into deeper water to launch completed barges that had been constructed upon its work surface.
Id.
We concluded, however, that as a matter of law the construction platform was not a Jones Act vessel.
Since
Cook
we have, despite our reluctance to take Jones Act claims from the trier of fact, affirmed findings that, as a matter of law, other floating work platforms are not vessels. A review of these decisions indicates three factors common to them: (1) the structures involved were constructed and used primarily as work platforms; (2) they were moored or otherwise secured at the time of the accident; and (3) although they were capable of movement and were sometime moved across navigable waters in the course of normal operations, any transportation function they performed was merely incidental to their primary purpose of serving as work platforms. For example, in
Leonard v.
Exxon, 581 F.2d at 522, we affirmed summary judgment denying seaman status to a worker injured on a floating construction platform moored to the bank of the Mississippi River and used for the construction of an underwater pipeline. The platform consisted of four barges, three of which were positioned end to end with the fourth located between the other three and the shore. The fourth barge was used as a crane platform and, in order for the crane to reach its work on the other barges, the three-barge platform was occasionally untied and moved forward or backward until properly positioned. In addition, the barges were utilized to transport pipelines constructed upon their work surface a short distance across navigable waters to- their proposed locations.
Id.
at 525 (Godbold, J., dissenting). The platform was not self-propelled and was moved by the application of external force. We found, over Judge Godbold’s dissent arguing that the barges were utilized for a function performed by traditional vessels— the transportation of cargo (the completed pipeline) over navigable waters — that the barges’ status was controlled by
Cook
and that the transportation function of the barges was incidental to their primary purpose.
See also Smith v. Massman Construction,
607 F.2d at 87 (“caisson” or large topless steel box, 200 feet by 84 feet, secured by cables to bank, designed to become part of bridge pier and also used for incidental transport of men and equipment across navigable waters);
Fox v. Taylor Diving & Salvage,
694 F.2d at 1349 (non-navigable chamber used to create air-tight environment for underwater welding);
Blanchard v. Engine & Gas Compressor Services,
575 F.2d at 1140 (compressor building mounted on submersible barges).
We have no difficulty concluding that the work punt’s status is controlled by
Cook’s
analogy to floating dry docks. The undisputed evidence supports only one rational inference: the work punt was not designed for navigation,
was not engaged in the business of navigation, and was not actually in navigation at the time of Bernard’s injuries. The work punt lacks all indicia of a structure designed for navigation; it has no raked bow, no means of self-propulsion, and no crew quarters or navigational lights.
The parties have stipulated that the work punt was used solely as “a small work platform.”
In short, we find no evidence from which a trier of fact could reasonably have concluded that the work punt’s primary purpose, design or business was other than to provide a work platform.
The record does not reveal the full details of the work punt’s movement around the New Basin Canal.
For example, we do not know how far the work punt actually travelled or whether it was tied to the shore during its movement. Having concluded, however, that the work punt’s primary purpose and business was to provide a work platform, these unanswered questions do not prevent us from affirming the district court's summary, judgment. The parties’ stipulation that the work punt was used solely as small work platform strongly suggests that Bernard’s use of the work punt as a means of transportation, if any, was minimal. At any rate, our decisions make clear that a structure whose primary function is to serve as a work platform does not become a vessel even if it sometimes moves significant distances across navigable waters in the normal course of operations.
We have no difficulty in concluding that the record could not support an inference that the work punt’s transportation function, if any, was sufficient to make it a Jones Act vessel. The stipulation that the work punt was used solely as a work platform negates any inference that it was also used for significant transportation functions. The transportation of Bernard around his work stations does not approach the regular delivery activities we found in
Cook
and
Leonard
to be “incidental” as a matter of law.
The record likewise could not support an inference that the work punt was actually engaged in navigation at the time of Bernard’s injuries. Bernard testified that he was “tied” to two pilings at the time of the accident and that he had one foot on a brace connecting the pilings.
We find that the work punt is analogous to a floating dry dock. Its primary function is to serve as a work platform and any transportation function it may have performed is incidental to that purpose. Moreover, it was secured to pilings and not actually engaged in navigation at the time of the accident.
Therefore, the work punt is not a Jones Act vessel as a matter of law.
We note that other courts considering the status of structures similar to the work punt have reached the same conclusion, For example, in
Powers v. Bethelhem Steel,
477 F.2d at 643, the First Circuit affirmed judgment notwithstanding the verdict that a work float is not a Jones Act vessel. Powers was injured while standing on a work float used as a platform from which workers cleaned and poured concrete around the piles of shipyard’s pier. The work float consisted of a raft, twenty-five feet long by five feet wide, constructed of timbers bonded together. It was attached to the pier by ropes. Workers descended to the float by ladder and “move[d] the raft under the pier to the piles by poling or pulling on lines attached to the pier.”
Id.
at 645. During the process of moving the float from pile to pile, it may have become unattached and free-floating for short periods.
Id.
at 645 n. 1. Citing our decision in
Cook,
the First Circuit found that, since the work float’s primary purpose was to provide a work platform and its movement was incidental to its intended use, it was . indistinguishable from a permanent floating dock.
Id.
at 647.
We also have no difficulty distinguishing the ease
sub judice
from those marginal cases that we have sent to the trier of fact, In
Brunet v. Boh Brothers Construction,
715 F.2d 196 (5th Cir.1983), for example, Brunet was injured aboard a pile-driving barge consisting of several “interlocking flexi-float platforms.” It carried a 150 ton crane and was designed and regularly used to transport the crane “across navigable waters to job sites that cannot be reached by land-based pile-drivers.”
Id.
at 198. Although moored at the time of the accident, it had been moved to four different job sites within the Gulf Coast area in the six months preceding the accident. In
Brunet,
we reversed summary judgment denying seaman status to the injured worker, refusing to characterize the barge’s transportation function as incidental as a matter of law. We remanded the case, holding that “the question whether the barge is a Jones Act vessel was integral to the jury question of seaman status.”
Id.
at 199.
We find
Brunet's
pile-driving barge distinguishable from the work punt. The parties in the instant case have stipulated that the work punt was used “solely” as a work piatform. In
Brunet,
on the other hand, the summary judgment evidence indicated that the barge was used as a work plat form and was both designed and used on a “fairly regular basis” to transport the crane around the Gulf of Mexico. Therefore, the
Brunet
record, like that in other “special use” cases, could have supported the inference that the barge was designed or used primarily for navigation.
A simi
lar inference can not be drawn from the instant facts. The work punt’s function “is that of a tool, not a vessel.”
Fox v. Taylor Diving & Salvage,
694 F.2d at 1354.
V. Conclusion.
We find no error in the district court’s conclusion that the record in this case could not support a finding that the work punt was a Jones Act vessel. Accordingly, we affirm the summary judgment below.
AFFIRMED.