delivered the opinion of the Court.
This case concerns the adjudicatory authority of tribal courts over personal injury actions against defendants who are not tribal members. Specifically, we confront this question: When an accident occurs on a portion of a public highway maintained by the State under a federally granted right-of-way over Indian reservation land, may tribal courts entertain a civil action against an allegedly negligent driver and the driver’s employer, neither of whom is a member of the tribe?
Such cases, we hold, fall within state or federal regulatory and adjudicatory governance; tribal courts may not entertain claims against nonmembers arising out of accidents on state highways, absent a statute or treaty authorizing the tribe to govern the conduct of nonmembers on the highway in question. We express no view on the governing law or proper forum when an accident occurs on a tribal road within a reservation.
I
In November 1990, petitioner Gisela Fredericks and respondent Lyle Stockert were involved in a traffic accident on a portion of a North Dakota state highway running through the Fort Berthold Indian Reservation. The highway strip crossing the reservation is a 6.59-mile stretch of road, open to the public, affording access to a federal water resource project. North Dakota maintains the road under a right-of- *443 way granted by the United States to the State’s Highway Department; the right-of-way lies on land held by the United States in trust for the Three Affiliated Tribes (Mandan, Hidatsa, and Arikara) and their members.
The accident occurred when Fredericks’ automobile collided with a gravel truck driven by Stockert and owned by respondent A-l Contractors, Stockert’s employer. A-l Contractors, a non-Indian-owned enterprise with its principal place of business outside the reservation, was at the time under a subcontract with LCM Corporation, a corporation wholly owned by the Tribes, to do landscaping work related to the construction of a tribal community building. A-l Contractors performed all work under the subcontract within the boundaries of the reservation. 1 The record does not show whether Stockert was engaged in subcontract work at the time of the accident. Neither Stockert nor Freder-icks is a member of the Three Affiliated Tribes or an Indian. Fredericks, however, is the widow of a deceased member of the Tribes and has five adult children who are tribal members. 2
Fredericks sustained serious injuries in the accident and was hospitalized for 24 days. In May 1991, she sued respondents A-l Contractors and Stockert, as well as A-l Contractors’ insurer, in the Tribal Court for the Three Affiliated Tribes of the Fort Berthold Reservation. In the same lawsuit, Fredericks’ five adult children filed a loss-of-consortium *444 claim. Together, Fredericks and her children sought damages exceeding $13 million. App. 8-10.
Respondents and the insurer made a special appearance in the Tribal Court to contest that court’s personal and subject-matter jurisdiction. The Tribal Court ruled that it had authority to adjudicate Gisela Fredericks’ case, and therefore denied respondents’ motion to dismiss the action. Id., at 24-25. 3 Respondents appealed the Tribal Court’s jurisdictional ruling to the Northern Plains Intertribal Court of Appeals, which affirmed. Id., at 36. Thereafter, pursuant to the parties’ stipulation, the Tribal Court dismissed the insurer from the suit. See id., at 38-40.
Before Tribal Court proceedings resumed, respondents commenced this action in the United States District Court for the District of North Dakota. Naming as defendants Fredericks, her adult children, the Tribal Court, and Tribal Judge William Strate, respondents sought a declaratory judgment that, as a matter of federal law, the Tribal Court lacked jurisdiction to adjudicate Fredericks’ claims. The respondents also sought an injunction against further proceedings in the Tribal Court. See id., at 41-45.
Relying particularly on this Court’s decisions in
National Farmers Union Ins. Cos.
v.
Crow Tribe,
We granted certiorari,
II
Our case law establishes that, absent express authorization by federal statute or treaty, tribal jurisdiction over the conduct of nonmembers exists only in limited circumstances. In
Oliphant
v.
Suquamish Tribe,
“To be sure, Indian tribes retain inherent sovereign power to exercise some forms of civil jurisdiction over non-Indians on their reservations, even on non-Indian fee lands. A tribe may regulate, through taxation, licensing, or other means, the activities of nonmembers who enter consensual relationships with the tribe or its members, through commercial dealing, contracts, leases, or other arrangements. A tribe may also retain inherent power to exercise civil authority over the conduct of non-Indians on fee lands within its reservation when that conduct threatens or has some direct effect on the political integrity, the economic security, or the health or welfare of the tribe.” Id., at 565-566 (citations and footnote omitted).
The term “non-Indian fee lands,” as used in this passage and throughout the Montana opinion, refers to reservation land acquired in fee simple by non-Indian owners. See id., at 548.
Montana thus described a general rule that, absent a different congressional direction, Indian tribes lack civil authority over the conduct of nonmembers on non-Indian land within a reservation, subject to two exceptions: The first exception relates to nonmembers who enter consensual relationships with the tribe or its members; the second concerns activity that directly affects the tribe’s political integrity, economic security, health, or welfare. The Montana Court recognized that the Crow Tribe retained power to limit or forbid hunting or fishing by nonmembers on land still owned by or held in trust for the Tribe. Id., at 557. The Court held, however, that-the Tribe lacked authority to regulate hunting and fishing by non-Indians on land within the Tribe’s *447 reservation owned in fee simple by non-Indians. Id., at 564-567. 6
Petitioners and the United States as amicus curiae urge that Montana does not control this case. They maintain that the guiding precedents are National Farmers and Iowa Mutual, and that those decisions establish a rule converse to Montana’s. Whatever Montana may instruct regarding regulatory authority, they insist, tribal courts retain adjudicatory authority in disputes over occurrences inside a reservation, even when the episode-in-suit involves nonmembers, unless a treaty or federal statute directs otherwise. Petitioners, further supported by the United States, argue, alternately, that Montana does not cover lands owned by, or held *448 in trust for, a tribe or its members. Montana holds sway, petitioners say, only with respect to alienated reservation land owned in fee simple by non-Indians. We address these arguments in turn.
A
We begin with petitioners’ contention that
National Farmers
and
Iowa Mutual
broadly confirm tribal-court civil jurisdiction over claims against nonmembers arising from occurrences on any land within a reservation. We read our precedent differently.
National Farmers
and
Iowa Mutual,
we conclude, are not at odds with, and do not displace,
Montana.
Both decisions describe an exhaustion rule allowing tribal courts initially to respond to an invocation of their jurisdiction; neither establishes tribal-court adjudicatory authority, even over the lawsuits involved in those cases. Accord,
Brendale
v.
Confederated Tribes and Bands of Yakima Nation,
National Farmers
involved a federal-court challenge to a tribal court’s jurisdiction over a personal injury action initiated on behalf of a Crow Indian minor against a Montana school district. The accident-in-suit occurred when the minor was struck by a motorcycle in an elementary school parking lot. The school occupied land owned by the State within the Crow Indian Reservation. See
We reversed the Court of Appeals’ judgment and held that federal courts have authority to determine, as a matter “arising under” federal law, see 28 U. S. C.. § 1331, whether a tribal court has exceeded the limits of its jurisdiction. See
Petitioners underscore the principal reason we gave in
National Farmers
for the exhaustion requirement there stated. Tribal-court jurisdiction over non-Indians in criminal cases is categorically restricted under
Oliphant,
we observed, while in civil matters “the existence and extent of a tribal court’s jurisdiction will require a careful examination of tribal sovereignty, the extent to which that sovereignty has been altered, divested, or diminished, as well as a detailed study of relevant statutes, Executive Branch policy as embodied in treaties and elsewhere, and administrative or judicial decisions.”
The Court’s recognition in
National Farmers
that tribal courts have more extensive jurisdiction in civil cases than in criminal proceedings, and of the need to inspect relevant statutes, treaties, and other materials, does not limit
Montana’s
instruction. As the Court made plain in
Montana,
the general rule and exceptions there announced govern only in the absence of a delegation of tribal authority by treaty or statute. In
Montana
itself, the Court examined the treaties and legislation relied upon by the Tribe and explained
*450
why those measures did not aid the Tribe’s case. See
Iowa Mutual
involved an accident in which a member of the Blackfeet Indian Tribe was injured while driving a cattle truck within the boundaries of the reservation.
Thereafter, the insurer commenced a federal-court action against the driver, his wife, the Montana corporation, and the ranch owners. See
ibid.
Invoking federal jurisdiction based on the parties’ diverse citizenship, see 28 U. S. C. § 1332, the insurer alleged that it had no duty to defend or indemnify the Montana corporation or the ranch owners because the injuries asserted by the driver and his wife fell outside the coverage of the applicable insurance policies. See
*451
We reversed. Holding that the District Court had diversity-of-citizenship jurisdiction over the insurer’s complaint, we remanded, as in
National Farmers,
for a determination whether “the federal action should be stayed pending further Tribal Court proceedings or dismissed.”
“Tribal authority over the activities of non-Indians on reservation lands is an important part of tribal sovereignty. See Montana v. United States,450 U. S. 544 , 565-566 (1981); Washington v. Confederated Tribes of Colville Indian Reservation,447 U. S. 134 , 152-153 (1980); Fisher v. District Court [of Sixteenth Judicial Dist. of Mont.], 424 U. S. [382,] 387-389 [(1976)]. Civil jurisdiction over such activities presumptively lies in the tribal courts unless affirmatively limited by a specific treaty provision or federal statute. ... In the absence of any indication that Congress intended the diversity statute to limit the jurisdiction of the tribal courts, we decline petitioner’s invitation to hold that tribal sovereignty can be impaired in this fashion.” Id., at 18.
Petitioners and the United States fasten upon the Court’s statement that “[c]ivil jurisdiction over such activities presumptively lies in the tribal courts.” Read in context, however, this language scarcely supports the view that the *452 Montana rule does not bear on tribal-court adjudicatory authority in cases involving nonmember defendants.
The statement stressed by petitioners and the United States was made in refutation of the argument that “Congress intended the diversity statute to limit the jurisdiction of the tribal courts.”
In light of the citation of
Montana, Colville,
and
Fisher,
the
Iowa Mutual
statement emphasized by petitioners does not limit the
Montana
rule. In keeping with the precedent to which
Iowa Mutual
refers, the statement stands for nothing more than the unremarkable proposition that, where tribes possess authority to regulate the activities of nonmembers, “[civil jurisdiction over [disputes arising out of] such activities presumptively lies in the tribal courts.”
Recognizing that our precedent has been variously interpreted, we reiterate that
National Farmers
and
Iowa Mutual
enunciate only an exhaustion requirement, a “prudential rule,” see
Iowa Mutual,
*454 B
We consider next the argument that
Montana
does not govern this case because the land underlying the scene of the accident is held in trust for the Three Affiliated Tribes and their members. Petitioners and the United States point out that in
Montana,
as in later eases following
Montana’s instruction
— Brendale v.
Confederated Tribes and Bands of Yakima Nation,
Congress authorized grants of rights-of-way over Indian lands in 1948 legislation. Act of Feb. 5, 1948, ch. 45, 62 Stat. 17, 25 U. S. C. §§ 323-328. A grant over land belonging to a tribe requires “consent of the proper tribal officials,” §324, *455 and the payment of just compensation, §325. 10 The grant involved in this case was made, pursuant to the federal statute, in 1970. Its purpose was to facilitate public access to Lake Sakakawea, a federal water resource project under the control of the Army Corps of Engineers.
In the granting instrument, the United States conveyed to North Dakota “an easement for a right-of-way for the realignment and improvement of North Dakota State Highway No. 8 over, across and upon [specified] lands.” App. to Brief for Respondents 1. The grant provides that the State’s “easement is subject to any valid existing right or adverse claim and is without limitation as to tenure, so long as said easement shall be actually used for the purpose . . . specified.” Id., at 3. The granting instrument details only one specific reservation to Indian landowners:
“The right is reserved to the Indian land owners, their lessees, successors, and assigns to construct crossings of the right-of-way at all points reasonably necessary to the undisturbed use and occupan[cy] of the premises affected by the right-of-way; such crossings to be constructed and maintained by the owners or lawful occupants and users of said lands at their own risk and said occupants and users to assume full responsibility for avoiding, or repairing any damage to the right-of-way, which may be occasioned by such crossings.” Id., at 3-4.
Apart from this specification, the Three Affiliated Tribes expressly reserved no right to exercise dominion or control over the right-of-way.
Forming part of the State’s highway, the right-of-way is open to the public, and traffic on it is subject to the State’s
*456
control.
11
The Tribes have consented to, and received payment for, the State’s use of the 6.59-mile stretch for a public highway. They have retained no gatekeeping right. So long as the stretch is maintained as part of the State’s highway, the Tribes cannot assert a landowner’s right to occupy and exclude. Cf.
Bourland,
III
Petitioners and the United States refer to no treaty or statute authorizing the Three Affiliated Tribes to entertain highway-accident tort suits of the kind Fredericks commenced against A-l Contractors and Stockert. Rather, petitioners and the United States ground their defense of tribal-court jurisdiction exclusively on the concept of retained or inherent sovereignty. Montana, we have explained, is the controlling decision for this case. To prevail here, petitioners must show that Fredericks’ tribal-court action against nonmembers qualifies under one of Montana’s two exceptions.
The first exception to the
Montana
rule covers “activities of nonmembers who enter consensual relationships with the
*457
tribe or its members, through commercial dealing, contracts, leases, or other arrangements.”
Montana’s
list of cases fitting within the first exception, see
The second exception to
Montana’s
general rule concerns conduct that “threatens or has some direct effect on the political integrity, the economic security, or the health or welfare of the tribe.”
The Court’s statement of Montana’s second exceptional category is followed by citation of four cases, ibid.; each of those cases raised the question whether a State’s (or Territory’s) exercise of authority would trench unduly on tribal self-government. In two of the cases, the Court held that a State’s exercise of authority would so intrude, and in two, the Court saw no impermissible intrusion.
The Court referred first to the decision recognizing the exclusive competence of a tribal court over an adoption proceeding when all parties belonged to the Tribe and resided on its reservation. See
Fisher,
Read in isolation, the
Montana
rule’s second exception can be misperceived. Key to its proper application, however, is the Court’s preface: “Indian tribes retain their inherent power [to punish tribal offenders,] to determine tribal membership, to regulate domestic relations among members, and to prescribe rules of inheritance for members. . . . But [a tribe’s inherent power does not reach] beyond what is necessary to protect tribal self-government or to control internal relations.”
Gisela Fredericks may pursue her case against A-l Contractors and Stockert in the state forum open to all who sustain injuries on North Dakota’s highway.
12
Opening the Tribal Court for her optional use is not necessary to protect tribal self-government; and requiring A-l and Stockert to defend against this commonplace state highway accident claim in an unfamiliar court
13
is not crucial to “the political integrity, the economic security, or the health or welfare of the [Three Affiliated Tribes].”
Montana,
*460 * * *
For the reasons stated, the judgment of the Court of Appeals for the Eighth Circuit is
Affirmed.
Notes
Respondents state that the subcontract had forum-selection and choice-of-law provisions selecting Utah state courts and Utah law for dispute resolution. See Brief for Respondents 2. Petitioners do not contest this point, but the subcontract is not part of the record in this ease.
The Court of Appeals for the Eighth Circuit stated that petitioner Fredericks resides on the reservation. See
Satisfied that it could adjudicate Gisela Fredericks’ claims, the Tribal Court declined to address her adult children’s consortium claim, App. 25; thus, no ruling on that claim is here at issue.
Petitioner Fredericks has commenced a similar lawsuit in a North Dakota state court “to protect her rights against the running of the State’s six-year statute of limitations.” Reply Brief 6, n. 2. Respondents assert that they have answered the complaint and “are prepared to proceed in that forum.” Brief for Respondents 8, n. 6. Respondents also note, without contradiction, that the state forum “is physically much closer by road to the accident scene ... than [is] the tribal courthouse.” Ibid.
In
Duro
v.
Reina,
Montana’s
statement of the governing law figured prominently in
Brendale
v.
Confederated Tribes and Bands of Yakima Nation,
In
Bourland,
the Court considered whether the Cheyenne River Sioux Tribe could regulate hunting and fishing by non-Indians in an area within the Tribe’s reservation, but acquired by the United States for the operation of a dam and a reservoir. We determined, dominantly, that no treaty or statute reserved to the Tribe regulatory authority over the area, see
The Court indicated in National Farmers that exhaustion is not an unyielding requirement:
“We do not suggest that exhaustion would be required where an assertion of tribal jurisdiction ‘is motivated by a desire to harass or is conducted in bad faith,’ or where the action is patently violative of express jurisdictional prohibitions, or where exhaustion would be futile because of the lack of an adequate opportunity to challenge the court’s jurisdiction.”471 U. S., at 856, n. 21 (citation omitted).
Petitioners note in this regard the Court’s unqualified recognition in
Montana
that “the Tribe may prohibit nonmembers from hunting or fishing on land belonging to the Tribe or held by the United States in trust for the Tribe.”
For contextual treatment of rights-of-way over Indian land, compare 18 U. S. C. § 1151 (defining “Indian country” in criminal law chapter generally to include “rights-of-way running through [a] reservation”) with §§ 1154(e) and 1156 (term “Indian country,” as used in sections on dispensation and possession of intoxicants, “does not include . . . rights-of-way through Indian reservations”).
Rights-of-way granted over lands of individual Indians also require payment of compensation, 25 U. S. C. § 325, and ordinarily require consent of the individual owners, see §324 (describing circumstances in which rights-of-way may be granted without the consent of owners).
We do not here question the authority of tribal police to patrol roads within a reservation, including rights-of-way made part of a state highway, and to detain and turn over to state officers nonmembers stopped on the highway for conduct violating state law. Cf.
State
v.
Schmuck,
See supra, at 445, n. 4.
Within the federal system, when nonresidents are the sole defendants in a suit filed in state court, the defendants ordinarily may remove the ease to federal court. See 28 U. S. C. § 1441.
When, as in this case, it is plain that no federal grant provides for tribal governance of nonmembers’ conduct on land covered by
Montana’s
main rule, it will be equally evident that tribal courts lack adjudicatory authority over disputes arising from such conduct. As in criminal proceedings, state or federal courts will be the only forums competent to adjudicate those disputes. See
National Farmers Union Ins. Cos.
v.
Crow Tribe,
