Robbin Weaver, a slot machine attendant, was injured on a riverboat casino owned by Hollywood Casino-Aurora Inc. (“Hollywood”). She sued for relief under general maritime jurisdiction, 28 U.S.C. § 1333, and the Jones Act, 46 U.S.C.App. § 688. The district court held a bench trial, and awarded Weaver $20,000 under the Jones Act for pain and suffering, but found that there was no causal connection between the injury and some of Weaver’s physical complaints. The district court also denied maintenance and cure, as well as attorneys’ fees. Weaver appeals the causation ruling, the denial of maintenance and cure, and the denial of attorneys’ fees. Because the record is insufficient to determine whether jurisdiction existed in the district court over Weaver’s suit, we remand for further proceedings.
I.
On May 15, 1995, Weaver was employed as a slot machine attendant on the City Lights I, a riverboat casino owned by Hollywood. 1 A movable chest of drawers con- *381 taming coins and tokens, known as a “bank,” fell on another employee. These banks are quite heavy, weighing between 1,000 and 1,500 pounds, and Weaver injured her left wrist while helping to push the bank off the other employee’s foot. This was the second time in two days that a bank had fallen over, so Hollywood apparently knew they were unstable.
Weaver filed suit in federal district court under general maritime jurisdiction and the Jones Act, seeking damages for injuries arising from the incident. The district court held a bench trial. Hollywood argued that the district court lacked jurisdiction under the Jones Act because a boat whose primary purpose is gaming is not a Jones Act vessel. In an effort to resolve this issue, the parties orally stipulated that the boat had navigational equipment, engines, a crew, and a raked bow. At the behest of Weaver’s counsel, Hollywood also stipulated that the boat “cruises on a navigable waterway.” Moments later, however, in response to a question from the court, Hollywood’s counsel stated that the City Lights I can only travel “[t]hree hundred yards, because there is a dam on the one side and a bridge on the other side.” The parties also stipulated that the purpose of the boat was gambling.
The district court subsequently rejected Hollywood’s jurisdictional argument, concluding that a gaming ship “can be a Jones Act vessel,” and holding that “[bjecause the defendants have not come forward with any evidence of special circumstances that would defeat Ms. Weaver’s jurisdictional showing,” Jones Act jurisdiction existed.
Weaver,
II.
While Hollywood did not appeal the district court’s holding that it had jurisdiction under the Jones Act, and the issue of general maritime jurisdiction was not even discussed below, “[n]o court may decide a case without subject matter jurisdiction, and neither the parties nor their lawyers may stipulate to jurisdiction or waive arguments that the court lacks jurisdiction.”
United States v. Tittjung,
We review
de novo
the district court’s legal determination of whether subject matter jurisdiction exists,
CCC Inform. Services, Inc. v. Amer. Salvage Pool
Assoc.,
A. Maritime Jurisdiction 2
The Constitution extends to Article III courts the power to hear “all Cases of *382 admiralty and maritime Jurisdiction.” U.S. Const, art. III, § 2. That power was codified at 28 U.S.C. § 1383(1), which provides for “original jurisdiction ... of ... [a]ny civil case of admiralty or maritime jurisdiction.... ”
Historically, the only question in determining whether admiralty or maritime tort jurisdiction existed was whether the tort occurred on navigable waters.
See Jerome B. Grubart, Inc. v. Great Lakes Dredge & Dock Co.,
There is thus a two-prong test for jurisdiction. The locality test reflects the traditional requirement that a tort occur on navigable waters. The requirement of a connection with maritime activity, also known as the nexus test, raises two issues. The court must first determine whether the incident involved has “a potentially disruptive effect on maritime commerce,” and second, whether “ ‘the general character’ of the ‘activity giving rise to the incident’ shows a ‘substantial relationship to traditional maritime activity.’ ”
See Grubart,
1. Location on navigable luaters.
As the Supreme Court has explained, “[a] court applying the location test must determine whether the tort occurred on navigable water.”
See id.
The seminal case on navigable rivers is
The Daniel Ball,
Those rivers must be regarded as public navigable rivers in law which are navigable in fact. And they are navigable in fact when they are used, or are susceptible of being used, in their ordinary condition, as highways for commerce, over which trade and travel are or may be conducted in the customary modes of trade and travel on water. And they constitute navigable waters of the United States within the meaning of the acts of Congress, in contradistinction from the navigable waters of the States, when they form in their ordinary condition by themselves, or by uniting with other waters, a continued highway over which commerce is or may be carried on with other States or foreign countries in the customary modes in which such commerce is conducted by water.
Id.
at 563.
See also Grubart,
*383
The suitability of a river for interstate commerce, i.e., navigability in fact, is thus crucial to general maritime jurisdiction. As we have noted previously, “[t]he logic of requiring commercial activity is evident. The purpose behind the grant of admiralty jurisdiction was the protection and promotion of the maritime shipping industry through the development and application, by neutral federal courts, of a uniform and specialized body of federal law.”
Chapman,
In this case, the parties stipulated that the Fox River (on which the riverboat casino was located) is navigable. 4 Weaver claims that this is a factual concession that the river is navigable in fact. Accordingly, she urges this court to find that the location test is satisfied.
If this stipulation were all the record had to offer, Weaver might be correct. But Hollywood contends that the statement that the Fox River was navigable was a reference to the river generally, not to the portion of the river where the tort occurred, and cites for support its statement to the district court that the boat was confined within a small portion of the river. Weaver has never questioned Hollywood’s testimony that the riverboat casino could only move “[tjhree hundred yards, because there is a dam on the one side and a bridge on the other side.” Hollywood thus argues that the river cannot be navigated at the point where the City Lights I was located.
Indeed, the fact that a river as a whole is navigable is not dispositive for purposes of maritime law.
See, e.g., LeBlanc v. Cleveland,
For example, the Second Circuit recently held that there was no admiralty jurisdiction in a case involving an accident between a kayak and a recreational motor boat on the Hudson River.
See LeBlanc,
The case before us presents a similar factual scenario. Based on the stipulations in this case, it is probable that the waters in which the City Lights I made its 300- *384 yard trips are not “navigable in fact.” The dam and bridge which obstructed the City Lights I indicate — at this location — a river which cannot be used as a highway for maritime commerce. A dam and bridge which prevent a riverboat casino from traveling over 300 yards are presumably not susceptible to commercial shipping, and thus fail the test set forth in The Daniel Ball.
In addition, if the enclosed portion of the Fox River at issue here is not navigable upstream or downstream for commercial shipping, it is also impossible to engage in interstate travel from this location. This part of the river, located in Aurora, Illinois, is entirely intrastate. “Those cases in which circuit courts have found dammed waterways navigable for jurisdictional purposes are easily distinguished by the fact that the waterway in question formed the border between two states, thereby rendering it capable of supporting interstate commerce despite the existence of artificial dams blocking downstream flow.”
Le-Blanc,
Even so, it is theoretically possible that although the river is impassable for the City Lights I (a boat whose dimensions might differ significantly from the dimensions of other craft), this part of the river could still serve as a continuous highway for other vessels designed for commercial shipping. While the record is silent on this question, outside sources indicate that the Fox River is very likely not navigable. A detailed map reveals that the Fox River is riddled with dams, both within the confines of the city of Aurora and within a short distance upstream and downstream of the city. 6
Despite these apparent obstructions to navigation, it appears from the record that no consideration was given to the possibility that the evidence precluded the river from meeting the legal test for navigability. There was certainly no reference to navigability in the district court opinion. Although Hollywood argues strenuously in its supplemental brief that the absence of navigable waters precluded jurisdiction, this is the first time this claim has been raised. 7 Indeed, Hollywood’s counsel only noted that the dam and bridge were impassable in response to a question from the district court about how the City Lights I navigates, a question which was not aimed at the location test.
In this context the parties’ stipulations could be read to concede that the Fox River is navigable in fact. In many cases uncontested factual stipulations can resolve a jurisdictional question.
Cf. Workman v. United Parcel Service, Inc.,
However, “[t]he rule against obtaining federal jurisdiction by consent ... would be ineffectual if parties by stipulating to jurisdictional facts could remove them entirely from judicial scrutiny.”
Id.
at 135 (citations omitted). “[I]f ... facts brought out in pretrial discovery or at trial, fairly shriek that there is no federal jurisdiction, the district judge must conduct whatever supplementary factual proceedings are necessary to resolve the doubt.”
Kanzelberger v. Kanzelberger,
In this case, the record makes it unlikely that jurisdiction existed, and the district court has made no inquiry into the navigability of the Fox River where the
City Lights I
was located. A remand is appropriate in these circumstances so the district court may determine whether subject matter jurisdiction exists.
See Freeman v. Northwest Acceptance Corp.,
2. Connection with maritime activity.
Hollywood also argues that the second requirement for general maritime jurisdiction, a “connection with maritime activity,” was not met by the facts in the record. First, Hollywood argues that Weaver’s injury does not have the required potential effect on maritime commerce. In determining whether this requirement is met, a court must consider the incident giving rise to the claim at an “intermediate level of generality.”
See Grubart,
Weaver claims the appropriate description of the incident would be “an injury occurring during rescue efforts on a vessel on navigable waters.” Hollywood counters that the better description would be “an injury to a slot machine attendant on a floating casino that cannot move beyond a confined area of water.” Hollywood thus argues that the events giving rise to Weaver’s injury could not possibly affect maritime commerce.
Hollywood’s description of the incident in this case is too narrow and specific.
Cf. Grubart,
The next step is to determine what the potentiality for the disruption of maritime commerce is, based on the general features of the incident. The key is not whether the incident affected maritime commerce, but whether it could do so. In Sisson, for example, the Supreme Court thought it relevant that a fire on board a recreational boat at a marina could impact other ships engaged in maritime commerce, even though the boat involved was not engaged in commerce.
Courts have used differing standards to determine the potential for disruption of maritime commerce.
Compare H20 Houseboat Vacations, Inc. v. Hernandez,
This case does not require us to speculate, however. The
City Lights I
was a commercial boat engaged in the transport of passengers for profit (even if its ultimate end was gambling), and without doubt an injury to one of its crew disrupts its participation in maritime commerce.
Cf. Great Lakes Dredge & Dock Co. v. City of Chicago,
If the district court finds on remand that the river is navigable, then the substantial relationship to traditional maritime activities requirement is easily met in this case. The Supreme Court has held that even noncommercial vessels when navigating in navigable waters have a substantial relationship to traditional maritime activities.
See Foremost Ins. Co. v. Richardson,
B. The Jones Act
Weaver alleged another basis of jurisdiction, one on which the district court relied, namely the Jones Act. The Jones Act provides jurisdiction for a “seaman” who suffers personal injury in the course of his employment. 46 U.S.C.App. § 688. To qualify as a seaman under the Jones Act, “an employee’s duties must ‘contribut[e] to the function of the vessel or to the accomplishment of its mission.’ ”
McDermott Int’l Inc. v. Wilander,
Weaver argues that “[i]n contrast to general maritime law, there is no locality requirement for the Jones Act....” While Weaver is correct that the Jones Act does not focus on the location of the vessel at the time of the injury, Jones Act jurisdiction still requires a relationship to navigable waters. This is because jurisdiction under the Jones Act “depends ‘not on the place where the injury is inflicted ... but on the nature of the seaman’s service, his status as a member of the vessel, and his relationship ... to the vessel and its operation in
navigable loaters.’
”
Chandris,
The Third Circuit’s recent decision in
Reeves v. Mobile Dredging & Pumping Co., Inc.,
26
F.3d
1247 (3rd Cir.1994), confirms this conclusion. As the
Reeves
court explained, “[a]lthough the requirement is not expressly stated in the [Jones Act], the Supreme Court has long required that the injury occur through the employee’s relationship to a vessel on a
navigable
body of water.”
See id.
at 1253 (citing
Swanson, 328
U.S. at 6,
If the water at issue in this case is similarly locked between a bridge and a dam (or is impassable to commercial shipping because of adjacent dams both upstream and downstream), as in Reeves the Jones Act would not provide jurisdiction. But as noted above, the record sheds insufficient light on this question. Therefore, the district court must determine on remand whether Weaver was employed on a boat with the requisite relationship to navigable waters for purposes of the Jones Act.
Hollywood also contests the district court’s holding that the
City Lights I
is a “vessel” for Jones Act purposes. As noted by the Fifth Circuit, the term “vessel” has not been precisely defined in this context.
See Gremillion v. Gulf Coast Catering Co.,
If the riverboat casino were a traditional craft navigating in navigable waters, it would presumably be a vessel and the Jones Act would apply.
See Gremillion,
Weaver does not agree that the City Lights I is an unconventional craft. Weaver also contends that the Davis case is bad law, and that Supreme Court precedent requires us to consider the activity of the City Lights I not as gambling, but as navigation.
We conclude based on the stipulations regarding the boat’s engines, crew, and other traditional vessel characteristics that the
City Lights I
is or at least was a traditional vessel.
Cf Gremillion,
III.
The stipulations before the district court raise serious questions whether the district court possessed subject matter jurisdiction over Weaver’s claims, under both federal maritime law and the Jones Act. Because the record is not sufficiently developed for us to determine whether jurisdiction exists, this case is Remanded for proceedings in accord with this opinion.
Notes
. In light of our jurisdictional holding, we present only a brief overview of the background events leading to Weaver's suit, which for the most part are not relevant to our decision below. For a more in-depth discussion of the events giving rise to this case,
see Weaver v. Hollywood Casino-Aurora, Inc.,
. The terms "admiralty” and “maritime” are used interchangeably for purposes of this opinion as the precedents discussed below use both terms. As noted by a leading treatise, *382 "[i]nsofar as the reference is to substantive law, the terms 'admiralty’ and 'maritime law’ are virtually synonymous in this country today, though the first derives from the connection of our modern law with the system administered in a single English court, while the second makes a wider and more descriptive reference." Grant Gilmore and Charles L. Black, Jr., The Law of Admiralty § 1-1 (2d ed„ 1975).
. The definition of "navigable waters" in one context does not necessarily apply in other contexts.
See Kaiser Aetna v. United States,
. The Fox River discussed herein should not be confused with Wisconsin's Fox River, the navigability of which is analyzed at length in
The Montello, 20
Wall. 430,
. It may seem strange for a boat with crew, engines, etc., to be placed in such a location. At the time of Weaver's injury, Illinois required gambling facilities to travel on water. The statute was subsequently amended to eliminate the requirement. See 230 ILCS % (1).
. In fact, a regional website devoted to paddle-boating offers detailed instructions and Census Bureau coordinates so that recreational parties may portage around Aurora's several dams. See http://www.chicagopad-dling.org.
.Before the district court, Hollywood's counsel stated that the question of whether the floating casino was engaged in a traditional maritime activity was the only issue raised ("I’m not contesting that she was working aboard the vessel, that the vessel was in navigation, all the other factors that would be considered.”). R.43 at 66.
. Hollywood also argues that there is no substantial relationship to traditional maritime activities because the riverboat casino is not a "vessel” under maritime law. However, for these purposes "a craft is a 'vessel' if its purpose is to some reasonable degree 'the transportation of passengers, cargo, or equipment from place to place across navigable waters.’ ”
Great Lakes Dredge & Dock Co.,
. The fact that the casino “navigates” the Fox River is of course not relevant to a determination whether the river is legally a “navigable water.’ A craft could navigate a swimming pool without the pool qualifying as navigable in the sense required for jurisdiction.
