REHNQUIST, J., delivered the opinion of the Court, in which BURGER, C. J., and BRENNAN, STEWART, MARSHALL, POWELL, and STEVENS, JJ., joined. BLACKMUN, J., filed a dissenting opinion, in which WHITE, J., joined, post, p. 259.

Harlon L. Dalton argued the cause for the United States. With him on the brief were Solicitor General McCree, Assistant Attorney General Moorman, Dirk Snel, and Carl Strass. Robert S. Pelcyger argued the cause for Bertha Mae Tabbytite, respondent under this Court's Rule 21 (4), in support of the United States. With him on the briefs was Vincent Vitale.

Richard Arthur Weinig argued the cause and filed a brief for respondents.

MR. JUSTICE REHNQUIST delivered the opinion of the Court.

We granted the petition for certiorari of the United States in this case, 444 U.S. 822, to decide the question "[w]hether 25 U.S.C. 357 authorizes a state or local government to `condemn' allotted Indian trust lands by physical occupation." Pet. for Cert. 2. That statute, in turn, provides in pertinent part:

"[L]ands allotted in severalty to Indians may be condemned for any public purpose under the laws of the State or Territory where located in the same manner as land owned in fee may be condemned, and the money awarded as damages shall be paid to the allottee." 31 Stat. 1084.

Both the factual and legal background of the case are complicated, but these complications lose their significance under our interpretation of 357. For it is conceded that neither the city of Glen Alps nor the city of Anchorage, both Alaska municipal corporations, ever brought an action to condemn the lands here in question in federal court as required by Minnesota v. United States, 305 U.S. 382 (1939). And since we hold that only in such a formal judicial proceeding may lands such as this be acquired, the complex factual and legal history of the dispute between the Government, respondents Glen M. Clarke et al., and respondent Bertha Mae Tabbytite need not be recited in detail. [FN 1]

[FN 1] Respondent Tabbytite lost in the Court of Appeals for the Ninth Circuit and did not petition for certiorari from that decision. She is therefore a respondent in this Court. This Court's Rule 21 (4). Her counsel has filed both a brief and reply brief adopting the statements of the case and the arguments set forth in the brief for the United States, but principally devoted to "matters not included in the Brief of the United States." Since we agree with the position advanced by the United States, we need not decide whether Tabbytite's arguments comply with this Court's Rule 40 (1) (d) (2). See also Rule 40 (3).

There are important legal and practical differences between an inverse condemnation suit and a condemnation proceeding. Although a landowner's action to recover just compensation for a taking by physical intrusion has come to be referred to as "inverse" or "reverse" condemnation, the simple terms "condemn" and "condemnation" are not commonly used to describe such an action. Rather, a "condemnation" proceeding is commonly understood to be an action brought by a condemning authority such as the Government in the exercise of its power of eminent domain. In United States v. Lynah, 188 U.S. 445 (1903), for example, which held that the Federal Government's permanent flooding of the plaintiff's land constituted a compensable "taking" under the Fifth Amendment, this Court consistently made separate reference to condemnation proceedings and to the landowner's cause of action to recover damages for the taking. Id., at 462, 467, 468. [FN 2]

[FN 2] The landowner's right to sue for damages was based on the theory that if a landowner were entitled to have governmental agents enjoined from taking his land without implementing condemnation proceedings, he also was entitled to waive that right and to demand just compensation as if the Government had taken his property under its sovereign right of eminent domain. 188 U.S., at 462. See also, e. g., United States v. Great Falls Manufacturing Co., 112 U.S. 645, 656 (1884). Cf. United States v. Lee, 106 U.S. 196 (1882) (holding that landowner could bring suit for ejectment against federal officials who took possession of land without bringing condemnation proceedings); Winslow v. Baltimore & Ohio R. Co., 188 U.S. 646, 660-661 (1903) (after declining to treat a suit for damages by a landowner as a condemnation action, the Court directed the lower court to enjoin temporarily proceedings brought by the landowner to dispossess the railroad company from the land "in order to enable [the railroad company] to condemn such land in proper proceedings for that purpose, which cannot be taken in the present suit").

[FN 3]Also, in United States v. Dow, 357 U.S. 17, 21 (1958), this Court stated:

"Broadly speaking, the United States may take property pursuant to its power of eminent domain in one of two ways: it can enter into physical possession of property without authority of a court order; or it can institute condemnation proceedings under various Acts of Congress providing authority for such takings. Under the first method -- physical seizure -- no condemnation proceedings are instituted, and the property owner is provided a remedy under the Tucker Act, 28 U.S.C. 1346 (a) (2) and 1491, to recover just compensation. See Hurley v. Kincaid, 285 U.S. 95, 104. Under the second procedure the Government may either employ statutes which require it to pay over the judicially determined compensation before it can enter upon the land, . . . or proceed under other statutes which enable it to take immediate possession upon order of court before the amount of just compensation has been ascertained."

There are also important practical differences between condemnation proceedings and actions by landowners to recover compensation for "inverse condemnation." Condemnation proceedings, depending on the applicable statute, require various affirmative action on the part of the condemning authority. To accomplish a taking by seizure, on the other hand, a condemning authority need only occupy the land in question. Such a taking thus shifts to the landowner the burden to discover the encroachment and to take affirmative action to recover just compensation. And in the case of Indian trust lands, which present the Government "`with an almost staggering problem in attempting to discharge its trust obligations with respect to thousands upon thousands of scattered Indian allotments,'" Poafpybitty v. Skelly Oil Co., 390 U.S. 365, 374 (1968), the United States may be placed at a significant disadvantage by this shifting of the initiative from the condemning authority to the condemnee.

Likewise, the choice of the condemning authority to take property by physical invasion rather than by a formal condemnation action may also have important monetary consequences. The value of property taken by a governmental body is to be ascertained as of the date of taking. United States v. Miller, 317 U.S. 369, 374 (1943). In a condemnation proceeding, the taking generally occurs sometime during the course of the proceeding, and thus compensation is based on a relatively current valuation of the land. See 1 L. Orgel, Valuation in Eminent Domain 21, n. 29 (2d ed. 1953). When a taking occurs by physical invasion, on the other hand, the usual rule is that the time of the invasion constitutes the act of taking, and "[i]t is that event which gives rise to the claim for compensation and fixes the date as of which the land is to be valued. . . ." United States v. Dow, 357 U.S. 17, 22 (1958).

Thus, even assuming that the term "inverse condemnation" were in use in 1901 to the same extent as it is today, there are sufficient legal and practical differences between "condemnation" and "inverse condemnation" to convince us that when 357 authorizes the condemnation of lands pursuant to the laws of a State or Territory, the term "condemned" refers not to an action by a landowner to recover compensation for a taking, but to a formal condemnation proceeding instituted by the condemning authority. [FN 4]

[FN 4] The legislative history of 357 does not provide any meaningful guidance as to the meaning of "condemned." The language eventually adopted as 357 was not part of the original bill. It was inserted, without comment or discussion, on the Senate floor. 34 Cong. Rec. 1448 (1901). And the House Report only briefly discussed 3 of the Act, to which 357 was added. It stated: "Fifth. Providing for the opening of highways through like lands under State and Territorial laws and upon the payment of compensation." H. R. Rep. No. 2064, 56th Cong., 2d Sess., 3 (1900).

Reversed.

MR. JUSTICE BLACKMUN, with whom MR. JUSTICE WHITE joins, dissenting.

Since the Court's opinion sets forth none of the facts of this case, it may be well to mention at least a few.

Bertha Mae Tabbytite, an American Indian, in 1954 settled on a 160-acre plot in the Chugach Mountains southeast of Anchorage, Alaska. She initially sought to perfect her claim to the land under the homestead laws and thereby to obtain an unrestricted fee title. Her applications for this were unsuccessful, however, and in 1966 Tabbytite agreed to accept a restricted trust patent to the land as an Indian allottee. As a result, the legal title remains in the United States, and Tabbytite's powers of alienation are restricted. See 25 U.S.C. 348.

Meanwhile, in 1958 Glen Clarke and his wife applied for a homestead patent on 80 acres adjoining the Tabbytite allotment. Two months later, without obtaining an easement, they constructed a road across that land. The Clarkes repeatedly contested Tabbytite's homestead application and prevented her from perfecting her patent. After securing their own patent in 1961, the Clarkes subdivided their property into 40 parcels, most of which were sold to others before this litigation began. That subdivision and surrounding lands were incorporated in June 1961 as a third-class city called Glen Alps. As a third-class city under Alaska law, Glen Alps did not possess the power of eminent domain.

In 1969, the United States filed the present action for damages and to enjoin the use of the road across the Tabbytite allotment. The District Court awarded damages for trespass but denied the injunction. The court concluded that the road was a "way of necessity," and that closing the road would cause "hardship" to the defendants. On the initial appeal to the United States Court of Appeals for the Ninth Circuit, that court reversed and did so on the grounds that upon entry in 1954 Tabbytite's title to the land was good against everyone except the United States Government, and that the Clarkes were not successors in interest to an easement implicitly retained by the Government. 529 F.2d 984 (1976).

That ruling, however, was not the end of the case. In September 1975, the municipality of Anchorage annexed Glen Alps and apparently took over maintenance of the roadway. On the remand to the District Court, the municipality entered the proceedings and opposed an injunction on the ground that it already had effectively exercised its power of eminent domain by "inverse condemnation." The United States took the position that the federal statute consenting to condemnation of allotted lands, 25 U.S.C. 357, does not authorize inverse condemnation. The District Court ruled that under the federal statute, state law determines the propriety of condemnation proceedings and that Alaska law, indeed, recognized "inverse condemnation." The court held, accordingly, that Tabbytite was entitled to just compensation, but that an injunction should not issue.

On appeal, the Ninth Circuit affirmed and remanded the case for further proceedings. 590 F.2d 765 (1979). It agreed with the District Court that 357 permits a State to take Indian land by paying compensation in an inverse condemnation action. It reasoned that "once the taking has been accomplished by the state it serves little purpose to interpret the statute to refuse to permit an inverse condemnation suit to be maintained on the grounds that the state should have filed an eminent domain action prior to the taking." 590 F.2d, at 767. It observed that "it seems a contradiction to deny Indian beneficial owners a cause of action for damages under the guise of protecting their rights." It predicted that its holding would encourage States and political subdivisions to act "with more circumspection, not less, when governmental activities conflict with ownership rights of Indian trust lands." Ibid.

I find the opinion of the Ninth Circuit persuasive. The present case is not a dispute about a right but about a remedy. There is, of course, no question that if 357 applies, Anchorage has the right to take Tabbytite's property through traditional eminent domain proceedings, and that Tabbytite has a right to just compensation if it does so. The case centers, however, in the fact that the municipality already has taken an interest in the property without a formal proceeding; the issue, then, is whether an after-the-fact award of just compensation is an adequate remedy. The dispute is in the measure of damages.

There is no question that inverse condemnation is recognized by Alaska law in circumstances similar to the present case. State of Alaska, Dept. of Highways v. Crosby, 410 P.2d 724 (Alaska 1966); City of Anchorage v. Nesbett, 530 P.2d 1324 (Alaska 1975). [FN *] As I read 357, it does not prohibit resort to inverse condemnation under state law. The statute explicitly refers to state law, and I read in the statute no specialized definition of the term "condemned" as a matter of federal law.

[FN *] It is not clear that Alaska law would permit deliberate resort to inverse condemnation as a means of avoiding initiation of formal condemnation proceedings. That issue is not before us, since Anchorage first assumed responsibility for the road under a claim of right under the first judgment of the District Court.

For these reasons, I would affirm the judgment of the Court of Appeals, and I respectfully dissent from the Court's reversal of that judgment.