JUSTICE WHITE delivered the opinion of the Court.
The problem of irrigating the arid lands of the Colorado River Basin has been confronted by the peoples of that region
I
The Colorado River Compact of 1922 divided the waters of the Colorado River between the Upper- and Lower-Basin States, but fell short of apportioning the respective shares among the individual States. Nor did the Boulder Canyon Project Act of 1928, 45 Stat. 1057, as amended, 43 U. S. C. § 617 et seq. (1976 ed. and Supp. V) (Project Act), a vast federal effort to harness and put to use the waters of the lower Colorado River, expressly effect such an apportionment. The principal dispute that became increasingly pressing over the years concerned the respective shares of the Lower-Basin States, particularly the shares of California and Arizona.
This litigation began in 1952 when Arizona, to settle this dispute, invoked our original jurisdiction, U. S. Const., Art. III, § 2, cl. 2, by filing a motion for leave to file a bill of complaint against California and seven public agencies of the State.
After lengthy proceedings, Special Master Simon Rifkind filed a report recommending a certain division of the Colorado River waters among California, Arizona, and Nevada. The parties' respective exceptions to the Master's report were extensively briefed and the case was twice argued. The Court for the most part agreed with the Special Master, 373 U.S. 546 (1963), and our views were carried forward in the decree found at 376 U.S. 340 (1964).
The long and rich story of the efforts on behalf of the States involved to arrive at a mutually satisfactory plan of apportionment is set forth in the Special Master's report and the Court's opinion and need not be repeated here. We agreed with the Special Master that the allocation of Colorado River water was to be governed by the standards set forth in the Project Act rather than by the principles of equitable apportionment which in the absence of statutory directive this Court has applied to disputes between States over entitlement to water from interstate streams. Nor was the local law of prior appropriation necessarily controlling. The Project Act itself was held to have created a comprehensive scheme for the apportionment among California, Nevada, and Arizona of the Lower Basin's share of the mainstream waters of the Colorado River, leaving each State its tributaries. Congress had decided that a fair division of the first 7.5 million acre-feet of such mainstream waters would give 4.4 million acre-feet to California, 2.8 million acre-feet to Arizona, and 300,000 acre-feet to Nevada. Arizona and California would share equally in any surplus. 373 U. S., at 565.
Over strong objection, we also agreed with the Special Master that the United States had reserved water rights for the Indian reservations, effective as of the time of their creation. Id., at 598-600. See Winters v. United States, 207 U.S. 564 (1908). These water rights, having vested before
Not all aspects of the case were finally resolved in the 1964 decree. First, in the course of determining irrigable acreage on the reservations, the Master resolved a dispute between the United States and the States with respect to the boundaries of the Colorado River and Fort Mojave Indian Reservations, generally finding that the reservations were smaller than the United States claimed them to be. Although we based the water rights decreed to these two reservations on the irrigable acreage within the boundaries determined by the Special Master, we found that it had been "unnecessary" for the Special Master finally to have determined these
On January 9, 1979, we entered a supplemental decree identifying the present perfected rights to the use of the mainstream water in each State and their priority dates as agreed to by the parties. 439 U.S. 419. We also decreed that, in the event of shortage, the Secretary of the Interior shall, before providing for the satisfaction of these present perfected rights, first provide for the satisfaction in full of the Indian water rights set forth in the 1964 decree for the five reservations. We expressly noted that these quantities, fixed in paragraphs 1 through 5 of Article II(D) of the 1964 decree "shall continue to be subject to appropriate adjustment by agreement or decree of this Court in the event that the boundaries of the respective reservations are finally determined." 439 U. S., at 421. The 1979 decree thus resolved outstanding issues in the litigation. But before that decree was entered new questions arose: The five Indian Tribes, ultimately joined by the United States, made claims for additional water rights to reservation lands.
Initially, both the state parties and the United States opposed intervention. Subsequently, the United States dropped its opposition to the Tribes' intervention. Still later, on December 22, 1978, the United States joined the Indians in moving for a supplemental decree to grant additional water rights to the reservations. In our 1979 decree, we denied the motion of the Fort Mojave, Chemehuevi, and Quechan Tribes to intervene insofar as they sought to oppose entry of the supplemental decree. Other matters raised by their motion, as well as that of the United States' and the other two Tribes, were not resolved. We appointed Senior Judge Elbert P. Tuttle Special Master and referred these motions to him. 439 U. S., at 436-437.
II
After conducting hearings, the Special Master issued a preliminary report on August 28, 1979, granting the Indian Tribes leave to intervene in subsequent hearings on the
On February 22, 1982, the Special Master issued his final report. The Special Master's findings were almost entirely consistent with the position of the United States and the Indian Tribes. Rejecting the States' strong objections to reopening the question of whether more practicable irrigable acreage actually existed than the United States claimed, Special Master Rifkind found, and our 1963 opinion and 1964 decree specified, the Special Master concluded that each of the Tribes was entitled to additional water rights based on land that he determined to be irrigable over and beyond that previously found. Furthermore, based on his earlier boundary determination, the Master determined that there was additional practicably irrigable acreage for which the Indians were entitled to further water rights. The States have filed exceptions to both of these determinations, as well as to various factual findings concerning the amount of practicably irrigable acreage.
III
The States have also refiled their exceptions to the Special Master's preliminary findings allowing the Indian Tribes to intervene in the action. We consider this matter first.
We agree with the Special Master that the Indian Tribes' motions to intervene should be granted. The States oppose
The States also oppose intervention on grounds that the presence of the United States insures adequate representation of the Tribes' interests. The States maintain that the prerequisites for intervention as of right set forth in Rule 24 of the Federal Rules of Civil Procedure are not satisfied. Aside from the fact that our own Rules make clear that the Federal Rules are only a guide to procedures in an original action, see this Court's Rule 9.2; Utah v. United States, 394 U.S. 89, 95 (1969), it is obvious that the Indian Tribes, at a minimum, satisfy the standards for permissive intervention
IV
We turn now to the first major question in the case: whether the determination of practicably irrigable acreage within recognized reservation boundaries should be reopened to consider claims for "omitted" lands for which water rights could have been sought in the litigation preceding the 1964 decree. The Special Master agreed with the United States and the Tribes that it is not too late in the day to modify the 1964 adjudication and decree, notwithstanding his own finding that "[t]he claim in the original case . . . embraced the totality of water rights for the Reservation lands." Tuttle Report, at 31. We disagree with the Special Master and sustain
Arizona v. California, unlike many other disputes over water rights that we have adjudicated, has been and continues to be governed mainly by statutory considerations. The primary issue in the case — the allocation of the waters of the Lower Colorado River Basin among the States — was resolved by the distribution of waters intended by Congress and written into the Project Act. The question of Indian water rights — an important but ancillary concern — was also decided by recourse to congressional policy rather than judicial equity. We held that the creation of the reservations by the Federal Government implied an allotment of water necessary to "make the reservation livable." 373 U. S., at 599-600. See Winters v. United States, 207 U.S. 564 (1908); Cappaert v. United States, 426 U.S. 128, 141 (1976). We rejected the argument, urged by the States, that equitable apportionment should govern the question. We were "not convinced by Arizona's argument that each reservation is so much like a State that its rights to water should be determined by the doctrine of equitable apportionment." 373 U. S., at 597. "Moreover, even were we to treat an Indian reservation like a State, equitable apportionment would still not control, since, under our view, the Indian claims here are governed by the statutes and Executive Orders creating the reservations." Ibid.
We went on to reject Arizona's further arguments that (1) the doctrine of Pollard's Lessee v. Hagan, 3 How. 212 (1845), and Shively v. Bowlby, 152 U.S. 1 (1894), prevented the Federal Government from reserving waters for federally reserved lands, 373 U. S., at 597; (2) water rights could not be reserved by Executive Order, id., at 598; and (3) there was insufficient evidence that the United States intended to reserve water for the Tribes, id., at 598-600.
The Tribes and the United States now claim that certain practicably irrigable acreage was "omitted" from those calculations.
We agree with the United States and the Tribes that this provision grants us power to correct certain errors, to determine reserved questions, and, if necessary, to make modifications in the decree. We differ in our understanding of the circumstances which make exercise of this power appropriate.
The Special Master believed that the decision whether to exercise that discretion should be governed by "law of the case" principles. Unlike the more precise requirements of res judicata, law of the case is an amorphous concept. As most commonly defined, the doctrine posits that when a court decides upon a rule of law, that decision should continue to govern the same issues in subsequent stages in the same case. See 1 B. J. Moore & T. Currier, Moore's Federal Practice ¶ 0.404 (1982) (hereinafter Moore).
For the following reasons, we hold that Article IX must be given a narrower reading and should be subject to the general principles of finality and repose, absent changed circumstances or unforeseen issues not previously litigated.
First, while the the technical rules of preclusion are not strictly applicable, the principles upon which these rules are founded should inform our decision. It is clear that res judicata and collateral estoppel do not apply if a party moves the rendering court in the same proceeding to correct or modify its judgment. 1B Moore ¶ 0.407, pp. 931-935; R. Field, B. Kaplan, & K. Clermont, Materials on Civil Procedure 860 (4th ed. 1978). Nevertheless, a fundamental precept of common-law adjudication is that an issue once determined by a competent court is conclusive. Montana v. United States, 440 U.S. 147, 153 (1979); Federated Department Stores, Inc. v. Moitie, 452 U.S. 394, 398 (1981); Cromwell v. County of Sac, 94 U.S. 351, 352-353 (1877). "To preclude parties from contesting matters that they have had a full and fair opportunity to litigate protects their adversaries from the expense and vexation attending multiple lawsuits, conserves judicial resources, and fosters reliance on judicial action by minimizing the possibility of inconsistent decisions." Montana v. United States, supra, at 153-154.
Recalculating the amount of practicably irrigable acreage runs directly counter to the strong interest in finality in this case. A major purpose of this litigation, from its inception to the present day, has been to provide the necessary assurance to States of the Southwest and to various private interests, of the amount of water they can anticipate to receive from the Colorado River system. "In the arid parts of the West . . . claims to water for use on federal reservations inescapably
Article IX did not contemplate a departure from these fundamental principles so as to permit retrial of factual or legal issues that were fully and fairly litigated 20 years ago. The Article does not explicate the conditions under which changes in the decree are appropriate. Very little discussion surrounded the Article, which was included in Master Rifkind's
This reading is supported by the proceedings before Master Rifkind. The record demonstrates that it was the understanding of the parties and Master Rifkind's intention that the calculation of practicably irrigable acreage be final.
This interpretation of Article IX is consistent with our action in prior original cases. Our long history of resolving disputes over boundaries and water rights reveals a simple fact: This Court does not reopen an adjudication in an original action to reconsider whether initial factual determinations were
We note that our cases with similar reservations of jurisdiction involved equitable apportionment where our latitude to correct inequitable allocations injustices is at its broadest. If even there our retention of jurisdiction was limited to the consideration of new issues and changed circumstances, rather than to permit the relitigation of factual determinations on which a decree has been based, a fortiori the reservation of jurisdiction in this case, not governed by equitable apportionment, is no broader.
We also fear that the urge to relitigate, once loosed, will not be easily cabined. The States have already indicated, if the issue were reopened, that the irrigable-acreage standard itself should be reconsidered in light of our decisions in United States v. New Mexico, 438 U.S. 696 (1978), and Washington v. Washington Commercial Passenger Fishing Vessel Assn., 443 U.S. 658 (1979), and we are not persuaded that a defensible line can be drawn between the reasons for reopening this litigation advanced by the Tribes and the United States on the one hand and the States on the other. It would be counter to the interests of all parties to this case to open what may become a Pandora's Box, upsetting the certainty of all aspects of the decree. These considerations, combined with the practice in our original cases and the
Because we have determined that the principles of res judicata advise against reopening the calculation of the amount of practicably irrigable acreage, and that Article IX does not demand that we do so, it is unnecessary to resolve the bitterly contested question of the extent to which the States have detrimentally relied on the 1964 decree. Detrimental reliance is certainly relevant in a balancing of the equities when determining whether changed circumstances justify modification of a decree. We believe that a certain manner of reliance has occurred, supra, at 621, but even the absence of detrimental reliance cannot open an otherwise final determination of a fully litigated issue. Finality principles would become meaningless if an adversarially determined issue were final only if the equities were against revising it.
Similarly, it is hardly determinative that the changes requested by the United States and the Indian Tribes do not involve reallocations of as much water as was involved in the initial litigation. Aside from the fact that the requested increases of between 15 and 22 percent in the amount of irrigable acreage determined in the initial decree hardly constitute "relatively minor adjustments," the magnitude of the adjustment requested is relevant only after it is established that the underlying legal issue is one which should be redetermined.
Finally, the absence of the Indian Tribes in the prior proceedings in this case does not dictate or authorize relitigation of their reserved rights. As a fiduciary, the United States had full authority to bring the Winters rights claims for the
Accordingly, we sustain the States' exceptions to this aspect of the Special Master's report.
V
We now address the dispute over reservation boundaries, which first arose during the hearing before Special Master Rifkind.
A
In the course of the proof by the United States as to the extent of the irrigable acreage of the Colorado River and Fort Mojave Reservations, California disputed the location of
California maintained its position before this Court that the Master should not have determined the disputed boundary of the Colorado River Reservation. California contended that it would be unfair to prejudice any of the parties in future litigation over land titles or political jurisdiction by approving findings on a tangential issue never pleaded by the United States. The State also observed that postponing determination of the boundary dispute would not materially affect the priority of the water right to which the disputed land was entitled, since both the Indians and the Palo Verde Irrigation District, in which California would place the disputed land, had high priorities.
The United States responded that the Master acted properly by resolving the boundary disputes:
The United States did not file any exceptions to the boundary determinations of the Special Master.
We did not accept the Master's resolution of the boundary disputes:
The decree that we entered limited the water rights of the two reservations to those awarded by the Master, based on the irrigable acreage within the boundaries as he had found them, but with respect to the boundary disputes, as stipulated by the parties,
B
The disputes about the boundaries of the Colorado River and the Fort Mojave Reservations are still with us. And
We describe first the Colorado River Reservation boundary dispute. Master Rifkind agreed with California that the disputed portion of the western boundary of the reservation ran along the west bank of the Colorado River as it moved from time to time, subject to the ordinary rules of accretion, erosion, and avulsion. The Master rejected the United States' claim that the boundary was fixed at the point where the west bank of the river existed on May 15, 1876, the date of the relevant Executive Order revising the boundaries of the reservation. Because we found it unnecessary to resolve the question, this dispute remained open for later settlement.
On January 17, 1969, the Secretary of the Interior, relying on an opinion of the Department's Solicitor, issued an order directing that approximately the northerly two-thirds of the disputed boundary was to follow the meander lines of 1879 and 1874 and was not to follow the changing west bank of the Colorado River. This order, issued unilaterally and without a hearing, added some 4,400 acres to the reservation. Later, the United States, on behalf of the Tribes, obtained final judgment in title disputes with private parties quieting title in the Tribes to various parcels in the area added to the reservation. Also, in the course of establishing the western boundary, the Secretary corrected what he deemed to be an error in an old survey. He approved the corrected plat adding 450 acres to the reservation on December 18, 1978.
Second is the dispute as to the boundary of the Fort Mojave Reservation, specifically, the location of the westerly boundary of the so-called Hay and Wood Reserve portion of
Third, a post-1964 secretarial order substantially enlarging the Fort Yuma Reservation has engendered controversy. The question that arose was whether some 25,000 acres of land, which in earlier proceedings in this case were not claimed by the United States to be part of the Fort Yuma Reservation, should now be deemed part of the reservation, thereby entitling the Tribe to appropriate additional water rights. A 1936 Interior Department Solicitor's opinion, based on an 1893 agreement with the Fort Yuma Tribes, had ruled that these lands were not part of the reservation. 1 Op. Solicitor of Dept. of Interior Relating to Indian Affairs 1917-1974, p. 596. In 1968 and 1977, Interior Department Solicitors reaffirmed the 1936 opinion. But on December 20, 1978, with no prior notice to parties who had participated in proceedings leading to the 1977 opinion, the Solicitor of the Interior Department overruled the three earlier Solicitor opinions and concluded that the 1893 agreement was invalid. 86 I. D. 3 (1978). The Secretary acted on that opinion,
The Chemeheuvi Indian Reservation boundaries have also been changed since 1964. Some 2,430 acres were "restored" to this reservation by secretarial order of August 15, 1974. This resulted from a secretarial determination that part of the land taken from the reservation for the construction of Parker Dam was not needed. However, neither the United States nor the Tribe claimed before the Special Master that there is any irrigable acreage within this addition.
There have been still other boundary developments in the years since our first decree in this case. In 1977, the Fort Mojave Tribe obtained a stipulated judgment in its favor against the assignees of a railroad patent grant. Nearly a section of land was thereby added to the reservation, 500 acres of which, it is claimed, are irrigable. Also, since 1964, there has been an accretion of some 883 acres along the west boundary of the Cocopah Indian Reservation, an accretion that the United States asserts has been confirmed as part of the reservation by a final court decree entered on May 12, 1975. Finally, in § 102(e) of the Colorado River Basin Salinity Control Act, Pub. L. 93-320 (June 24, 1974), 88 Stat. 269, Congress directed the Secretary to cede a tract of federal land to the Cocopah Indians as an addition to their reservation. This cession was intended to be considered full payment for a certain right-of-way across the Cocopah Reservation. See S. Rep. No. 93-906 (1974). Between the accretion and the congressional Act, the United States claims that 1,161 irrigable acres have been added to the Cocopah Reservation.
As we have recited, supra, at 630-632 and this page, all of the foregoing developments with respect to reservation boundaries took place long prior to the entry of our supplemental decree in 1979. We were apprised of them by the
The motions of the United States and the Tribes were referred to the Special Master. Id., at 436-437.
C
In its motion to amend the decree, the United States, with the support of the five Tribes, contended that the above-described events constituted "final determinations" of the boundaries within the meaning of our 1964 decree. The state parties and the California agencies objected that the secretarial orders and the quiet title judgments were not "final determinations" within the meaning of Article II(D)(5) of our decree, since they had not been given an opportunity to participate in any of these proceedings, and since the administrative orders were still susceptible to judicial review. They argued, however, that the boundary controversies were ripe for judicial review, and they urged the Special Master to receive evidence, hear legal arguments, and resolve each of the boundary disputes, but only for the limited purpose of establishing additional Indian water rights, if any.
The Master was unmoved by the state parties' argument that they did not receive their "day in court" before any administrative or judicial decisionmaker, since he was "aware of no claim to land in any of the disputed areas by any of the State Parties." Tuttle Report, at 74. Any remaining concerns could "be met by the inclusion in the final decree of the Court of a provision that would reduce the allotment now sought on behalf of the Tribes pro tanto for lands found to be practicably irrigable which subsequent litigation determines not to be Indian land." Id., at 75. Accordingly, the Master
D
We cannot agree with the Special Master that the reservation boundaries extended by secretarial order have been "finally determined" within the meaning of Article II(D)(5) of our 1964 decree. With respect to these boundary lines, we sustain the exceptions and decline to increase the Tribes' water rights at this time.
In our 1963 opinion, when we set aside Master Rifkind's boundary determinations as unnecessary and referred to possible future final settlement, we in no way intended that ex parte secretarial determinations of the boundary issues would constitute "final determinations" that could adversely affect the States, their agencies, or private water users holding priority rights. In the first place, Article II(D)(5) was a stipulated provision; it is implausible to suggest that the
Of course, we now intimate nothing as to the Secretary's power or authority to take the actions that he did or as to the soundness of his determinations on the merits. It must be remembered that while we did not accept Master Rifkind's boundary decisions, water allocations to the Tribes under our decree were limited to the irrigable lands within the reservation boundaries as the Master had determined them to be. Thus, up to the present the States have had the benefit of their victory before Master Rifkind on the boundary issues; and even if there were something they might have done to set in motion some judicial proceeding to resolve the disputes left open by our decree, they obviously had no great incentive to do so. The United States, on the other hand, the intervenor with the burden of proving reserved rights, might have instituted appropriate judicial proceedings in the District Courts, in which event the issues tried by the Special Master would presumably have been relitigated. Instead, the Secretary
While the California agencies have filed suit to set aside the secretarial orders extending reservation boundaries, the States have not yet sought to intervene in that litigation. They, along with the state agencies themselves, insist that Special Master Tuttle erred in refusing to adjudicate the boundary issues, that their exceptions in this respect should be sustained, and that appropriate action should be taken to resolve the disputes in this original action. In this respect, we disagree with the States. It is clear enough to us, and it should have been clear enough to others, that our 1963 opinion and 1964 decree anticipated that, if at all possible, the boundary disputes would be settled in other forums. At this juncture, we are unconvinced that the United States District Court for the Southern District of California, in which the challenge to the Secretary's actions has been filed, is not an available and suitable forum to settle these disputes. We note that the United States has moved to dismiss the action filed by the agencies based on lack of standing, the absence of indispensable parties, sovereign immunity, and the applicable statute of limitations.
This being so, these adjudications are final as a practical matter, and the only issue remaining concerning these parcels, which the States concede are Indian land, is the same issue that would remain if the Special Master had made the same boundary determinations and the States were content to accept them — namely, how much practicably irrigable acreage exists in each such parcel? That issue Special Master Tuttle determined as to each parcel involved in this litigation. Insofar as we can discern from the States' brief, id., at 117, Table 1, the States do not differ with the Master's determination of irrigable acreage in the areas added to the reservations by way of judicial decree, except perhaps to the extent of a few acres in the tract labeled FM-11 by the parties.
Therefore, we conclude that the decree should be amended by providing to the respective reservations appropriate water rights to service the irrigable acreage the Master found to be contained within the tracts adjudicated by court decree to be reservation lands.
There is no issue about the expansion of the Cocopah Reservation by congressional statute. The water right for that addition to the reservation could not be given and was not given a retroactive priority date. The right accorded dates from June 24, 1974, and hence will not disturb the prior rights of the States or the other parties to this case.
VI
Because of our disposition of the above issues, it is not necessary to resolve the other exceptions brought by the States and state agencies pertaining to the amount of irrigable acreage within the so-called omitted lands or within the boundaries that we have not recognized as finally determined at this time. It is similarly unnecessary for us to pass on the exceptions brought by the United States concerning the recommended decree. The parties are directed to submit, before September 19, 1983, a proposed decree to carry this opinion into effect.
It is so ordered.
I join Part III of the Court's opinion, granting the petitions to intervene in this action filed by the Fort Mojave, Colorado River, Chemehuevi, Cocopah, and Quechan Tribes (collectively, the Tribes). I also agree with the basic premise of Part IV of the Court's opinion that in Article IX of our 1964 decree, 376 U.S. 340, 353, we retained the power to reconsider our quantification of the Tribes' reserved water rights, as set out in Article II(D) of the 1964 decree, id., at 343-345. See ante, at 618. I part company with the Court, however, in its refusal to exercise that power, given the unique circumstances of this litigation and the timing of the Tribes' and United States' motions. In addition, I find inexplicable the Court's decision to sustain the exceptions of Arizona, California, and the California agencies (hereinafter States) to the Special Master's proposed solution to the boundary lands controversy.
I
The so-called "omitted" lands are irrigable areas, within the Tribes' reservations, which the United States failed to identify during the extensive proceedings before Special Master Rifkind that preceded our 1964 decree. The fact that irrigable lands were not called to the attention of the Master or the Court is significant because the Master and the Court held that the amount of water which the Tribes were entitled to divert from the mainstream of the Colorado depended on the number of "irrigable acres" within each reservation. 373 U.S. 546, 601 (1963); Report of Special Master Rifkind 263-265 (hereinafter Rifkind Report). Although the States vociferously dispute exactly how much of the omitted lands
There are strong arguments for correcting the quantifications of the Tribes' diversion rights in the 1964 decree, to include the amounts of water that could be used economically to irrigate the omitted lands. As this litigation now stands, the considerations of finality are not so strong, nor the interests of justice so weak, as the Court would have them. The system contemplated by our 1964 decree for allocating the waters of the Colorado River's Lower Basin has yet to become final, either as a formal or as a practical matter, and correction of the decree at this time would in no way compromise our continuing intention to effect a final allocation of the Lower Basin mainstream. Furthermore, awarding additional diversion rights to reflect the irrigable acreage not considered prior to the 1964 decree would correct a manifest injustice to the Tribes, who were not themselves before this Court in 1964, and it would do so with little, if any, prejudice to interests of other parties to this litigation.
A
The Court's opinion excessively extols the principle of "finality," but overlooks the caveat that "finality" means different things in different contexts, and that the law accords finality different weight depending on the context. First, the Court borrows support from formal, largely nondiscretionary doctrines such as res judicata. It admits, however, that res
A final judgment makes a difference. It marks a formal point at which considerations of economy, certainty, reliance, and comity take on more strength than they have before the judgment. A court's decision to reconsider a prior ruling before the case becomes final, however, is ultimately a matter of "good sense." Moore § 0.404[10], at 573. Concern for finality remains an important policy, even before final judgment. In the absence of some overriding reason, a court should be reluctant to reopen that which has been decided merely to correct an error, even though it has the power to do so. See Messenger v. Anderson, 225 U.S. 436, 444-445 (1912). Nevertheless, federal courts have traditionally thought that correcting a manifest injustice was reason enough to reconsider a prior ruling, see Moore ¶ 0.404[1], p. 408, and, although they may hold a party to its failure to litigate a claim when it had the opportunity, they have regarded finality concerns as less compelling when the question at issue has never actually been contested, see Hartford Life Ins. Co. v. Blincoe, 255 U.S. 129, 136 (1921).
Thus, although the Court stresses Special Master Rifkind's interest in a fixed and final decree, see ante, at 622-624, and n. 15, that interest is largely irrelevant to the question at hand. One can share Special Master Rifkind's interest in having a fixed decree, and even Abraham Lincoln's scorn for scoundrels in courthouse basements, and still think it desirable to correct the decree before it becomes fixed. Our interest in a fixed, reliable decree is well enough served if we make clear
The Court acknowledges that this litigation was far from final when the United States and the Tribes raised the claims now at issue, because the Court had not confirmed a list of the "present perfected rights," or rights to use Colorado River mainstream flows that vested before the effective date of the Boulder Canyon Project Act of 1928, 43 U. S. C. § 617. Ante, at 611. The allocation system for the Lower Basin could not become final until an authoritative list of "present perfected rights" and their priority dates had been established.
Furthermore, it has long been recognized that the primary object of this litigation was to establish a regimen for allocating the Lower Basin waters sufficiently reliable to permit Congress and Arizona to go forward with the Central Arizona Project, a massive public works effort to make Colorado River water available to agricultural interests in central Arizona. Tuttle Report 38-39; Meyers, The Colorado River, 19 Stan. L. Rev. 1, 73 (1966) (hereinafter Meyers). That purpose has been accomplished. The Central Arizona Project was authorized in 1968, and construction has now reached an advanced stage. But even at this late date the Project is still several years from completion. And until it is ready to begin diverting Colorado River water, the allocation system in our 1964 decree has little practical importance, because Arizona lacks the capacity to use most of the water rights allocated to it in the 1964 decree.
In sum, the interest in "finality" does not dispose of this case. Principles of judicial economy provide the sole basis for the Court's refusal to correct the 1964 decree. But no significant adjudicative resources were expended on the omitted lands claims in the proceedings prior to the 1964 decree, because they were not raised at all. And, although the United States' failure to identify the omitted irrigable lands 25 years ago should not be excused, I cannot join in depriving the Tribes permanently of significant rights to water on that basis alone, especially when I see little prejudice to the
B
The Tribes will suffer a manifest injustice if we fail to consider the omitted lands claims. Under the uncorrected 1964 decree, the Tribes stand to lose forever valuable rights to which they are entitled under the Court's construction of the Executive Orders creating their reservations, 373 U. S., at 595-601. This loss occurs entirely because the United States failed to perform its obligations as trustee and advocate to present evidence to the Court of all irrigable lands within the reservations, or at least to make a record of its justification for not presenting such evidence.
It is certainly not the case that the United States made a considered decision to waive the Tribes' claims to water for the omitted lands. Cf. ante, at 617-618, n. 7, and 622-623, n. 14 (suggesting otherwise). The existence of some omitted
Heckman v. United States, 224 U.S. 413 (1912), see ante, at 627, does not require us to make the Tribes bear the cost of the United States' error. The relevant question in Heckman, raised by non-Indian defendants, was whether individual Indians were necessary parties in a suit by the United States to set aside conveyances by those Indians of lands they were forbidden by statute to alienate, and over which the United States had significant trust responsibilities. 224 U. S., at 444. The Court held that the United States had power to enforce the statutory restrictions without the acquiescence of the Indians, and that by virtue of the restrictions the individual Indians had no interest in the subject matter of the suit. Id., at 445. In passing, the Court noted that representation of Indian interests by the United States "traces its source to the plenary control of Congress in legislating for the protection of the Indians under its care, and it recognizes no limitations that are inconsistent with the discharge of the national duty." Ibid.
There has often been reason to question the quality of that representation, especially when rights to scarce water in the West were at stake. In 1973, the National Water Commission reported: "In the history of the United States Government's treatment of Indian Tribes, its failure to protect Indian water rights for use on the Reservations it set aside for them is one of the sorrier chapters." National Water Comm'n, Water Policies for the Future — Final Report to the President and to the Congress of the United States 475. President Nixon admitted as much in a 1970 message to Congress:
The Court carefully explains that the United States had no "actual conflict of interest" with regard to Lower Basin water rights, by which it apparently means that the recognition of Indian water rights did not diminish other federally reserved water rights. See ante, at 627. I agree. Nevertheless, history discloses that the United States has not always taken such a narrow view of its interests in water rights controversies. On the Colorado River and elsewhere, it has constructed extensive water projects to serve nonfederal interests; congressional authorization of the Boulder Canyon Dam was the crucial event in the development of the Lower Basin, shaping this litigation from its inception. See 373 U. S., at 564-590. The United States has sometimes been slow to press Indian claims when they conflicted with those of politically influential non-Indian interests. See, e. g., Pyramid Lake Paiute Tribe v. Morton, 354 F.Supp. 252, 256-257 (DC 1973). See generally Federal Protection of Indian Resources: Hearings before the Subcommittee on Administrative Practice and Procedure of the Senate Committee on the Judiciary, 92d Cong., 1st Sess., 235-249, 907-914 (1971) (hereinafter Senate Hearings); F. Cohen, Handbook of Federal Indian Law 596-599 (1982) (hereinafter Cohen).
This case provides proof (if any is needed) that those with direct interests — economic, historical, spiritual — in the outcome of a case are their own best representatives. Upon entering this litigation, the Tribes swiftly exposed the extent of the United States' pre-1964 neglect. I would not hold that the United States had so violated the ordinary standards of attorney care as to be liable for "inadequate" representation of the Indian interests in this litigation, if that were the standard of liability, on the basis of the mere fact that it failed to claim water rights for some irrigable acreage. But I do not find in this record any justification for the United States' failure to present evidence on the omitted lands. Even if the United States did intend to waive the omitted lands claims, I see no good reason, before final judgment, to deny the Tribes a hearing on claims that have never been litigated. As a matter of justice, the Tribes deserve this chance to defend rights which should have been theirs.
C
In deciding whether to correct the 1964 decree, we should also consider any possible prejudice which the States might suffer as a result. Of course, the States would prefer that we not allocate additional water rights to the Tribes; at least at some point in the future, additional Indian rights may make the rights of junior state appropriators less certain. With regard to timeliness and finality, however, prejudice means prejudice from procedure rather than from the result. Hence, the important question is whether the States would
The Special Master considered this issue at length and determined that the States would not be significantly prejudiced by adjustments in the 1964 decree. Tuttle Report 38-46.
In addition, the Tribes are not currently able to use all the rights allocated to them under the 1964 decree.
In sum, correcting the 1964 decree to reflect additional irrigable acreage in the omitted lands would not harm the States more than they would have been harmed had the omitted lands been considered in framing the 1964 decree. In truth, Indian water rights are unlikely to affect state interests to any significant degree until well into the next generation,
II
Reasonable judges might differ over some aspects of this case, but I would not have thought the Special Master's solution to the boundary lands controversy was among them. The Court's failure to approve a decree that includes a quantification of the water rights appurtenant to the disputed boundary areas serves no discernible purpose, and it is profoundly inconsistent with its emphasis in Part IV of its opinion on the ideals of finality, judicial economy, and predictability of water rights. At no point does the Court explain its rejection of the Special Master's entirely reasonable proposal regarding the boundary lands.
In our 1963 opinion, we rejected Special Master Rifkind's de novo determination of boundary disputes concerning two of the reservations, 373 U. S., at 601, and our 1964 decree was left open to the extent of permitting an award of additional water rights should the boundaries be "finally determined," Art. II(D)(5), 376 U. S., at 345. The 1979 decree recognized that the actual boundaries of all five reservations are subject to dispute. 439 U. S., at 421-422. At the outset of the current phase of this litigation, all parties agreed that it was time to bring the maximum degree of certainty possible to the Lower Basin allocation system, a task requiring "final determination" of the disputed boundaries, at least for the purpose of quantifying the Tribes' entitlement to water. The United States and the Tribes urged before the Special Master that certain administrative determinations by
The Special Master chose a middle course, calculated to put an end to further litigation in this Court. He took evidence on and determined the amount of irrigable acreage within the boundaries recognized by the Secretary of the Interior, and he calculated the corresponding water rights for inclusion in the final decree. However, he also recommended that the final decree include the following proviso:
The effect of this proviso would be to grant the Indian Tribes the water rights appurtenant to the disputed boundary areas on a conditional basis. If the States succeeded in overturning any of the Secretary's boundary determinations in an appropriate forum, the corresponding water rights — precisely quantified for each area in the Special Master's Report, id., at 192-196, 239-277 — would automatically be subtracted from the Tribes' entitlements.
The Court disregards these virtues. Simply turning the clock back to 1964, it guarantees that the original jurisdiction litigation over Lower Basin water rights will proceed to another "round," and possibly still more "rounds" thereafter, as one-by-one the border questions are settled by litigation. If any of the Secretary's determinations are upheld, the Court will have to duplicate the efforts of the present Special Master. See ante, at 638.
For the reasons described in Part I-C, supra, awarding additional water rights to the Tribes works no immediate harm to state interests. The Court's preference for prolonging this litigation and its attendant uncertainty is at odds with the principles upon which it resolves the omitted lands issue. I would accept the Special Master's resolution of the boundary lands issue for purposes of framing a final decree in this action.
III
The Court's disposition of the omitted lands and boundary lands issues makes it unnecessary for it to reach the remaining issues in this case. Although my own views would require us to reach those issues, I do not think it worthwhile to discuss them at any length. The States have filed a number of highly specific exceptions to the Special Master's determinations regarding the irrigability of particular parcels. Although formal concepts of "plain error" and "abuse of discretion" do not apply to the recommendations of special masters in original jurisdiction litigation, the care with which the present Special Master has explained his conclusions on these technical issues demands respect, and I would overrule the States' exceptions. The United States has also filed four exceptions. The first asks that we recognize for purposes of our decree the Secretary of the Interior's resolution of an
FootNotes
Additional passages of similar import are collected in Appendix A to Brief for State Parties in Support of Exceptions (May 20, 1982). See also n. 15, infra.
"One possibility would be to adopt an open-end decree, simply stating that each Reservation may divert at any particular time all the water reasonably necessary for its agricultural and related uses as against those who appropriated water subsequent to its establishment. However, such a limitless claim would place all junior water rights in jeopardy of the uncertain and the unknowable. Financing of irrigation projects would be severely hampered if investors were faced with the possibility that expanding needs on an Indian Reservation might result in a reduction of the project's water supply." Rifkind Report, at 263-264.
For this reason, the Master concluded that "the most feasible decree" would be to establish a water right for each of the reservations in the amount necessary to irrigate all of the practicably irrigable acreage on the reservations and to satisfy related stock and domestic uses. This would "establish water rights of fixed magnitude and priority so as to provide certainty for both the United States and non-Indian users." Id., at 265.
In Wyoming v. Colorado, 259 U.S. 419 (1922), the Court corrected an inadvertent omission four months after the entry of a decree. 260 U.S. 1 (1922). See 2 R. Clark, Waters and Water Rights 338 (1967).
The dissent also observes, post, at 657-658, n. 10, that, under our holding, the States have no real incentive to bring the pending litigation to a prompt conclusion. If his approach were adopted, however, the United States and the Tribes would similarly lack incentive. At present, we have no reason to believe that the District Court will fail to ensure that the pending litigation will be promptly concluded.
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