Arizona v. California,
530 U.S. 392 (2000)

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No.8, Orig. Argued April 25, 2000-Decided June 19, 2000

This litigation began in 1952 when Arizona invoked this Court's original jurisdiction to settle a dispute with California over the extent of each State's right to use water from the Colorado River system. The United States intervened, seeking water rights on behalf of, among others, five Indian reservations, including the Fort Yuma (Quechan) Indian Reservation, the Colorado River Indian Reservation, and the Fort Mojave Indian Reservation. The first round of the litigation culminated in Arizona v. California, 373 U. S. 546 (Arizona I), in which the Court held that the United States had reserved water rights for the five reservations, id., at 565, 599-601; that those rights must be considered present perfected rights and given priority because they were effective as of the time each reservation was created, id., at 600; and that those rights should be based on the amount of each reservation's practicably irrigable acreage as determined by the Special Master, ibid. In its 1964 decree, the Court specified the quantities and priorities of the water entitlements for the parties and the Tribes, Arizona v. California, 376 U. S. 340, but held that the water rights for the Fort Mojave and Colorado River Reservations would be subject to appropriate adjustment by future agreement or decree in the event the respective reservations' disputed boundaries were finally determined, id., at 345. The Court's 1979 supplemental decree again deferred resolution of reservation boundary disputes and allied water rights claims. Arizona v. California, 439 U. S. 419, 421 (per curiam). In Arizona v. California, 460 U. S. 605 (Arizona II), the Court concluded, among other things, that various administrative actions taken by the Secretary of the Interior, including his 1978 order recognizing the entitlement of the Quechan Tribe (Tribe) to the disputed boundary lands of the Fort Yuma Reservation did not constitute final determinations of reservation boundaries for purposes of the 1964 decree. Id., at 636-638. The Court also held in Arizona II that certain lands within undisputed reservation boundaries, for which the United States had not sought water rights in Arizona I-the so-called "omitted lands"-were not entitled to water under res judicata principles. 460 U. S., at 626. The Court's 1984 supplemental decree again declared that water rights for all five reservations would be subject to appropriate adjustments if the reservations' boundaries were finally determined. Arizona v. California, 466 U. S.


144, 145. In 1987, the Ninth Circuit dismissed, on grounds of the United States' sovereign immunity, a suit by California state agencies that could have finally determined the reservations' boundaries. This Court affirmed the Ninth Circuit's judgment by an equally divided vote.

The present phase of the litigation concerns claims by the Tribe and the United States on the Tribe's behalf for increased water rights for the Fort Yuma Reservation. These claims rest on the contention that the Fort Yuma Reservation encompasses some 25,000 acres of disputed boundary lands not attributed to that reservation in earlier stages of the litigation. The land in question was purportedly ceded to the United States under an 1893 Agreement with the Tribe. In 1936, the Department of the Interior's Solicitor Margold issued an opinion stating that, under the 1893 Agreement, the Tribe had unconditionally ceded the lands. The Margold Opinion remained the Federal Government's position for 42 years. In 1946, Congress enacted the Indian Claims Commission Act, establishing a tribunal with power to decide tribes' claims against the Government. The Tribe brought before the Commission an action, which has come to be known as Docket No. 320, challenging the 1893 Agreement on two mutually exclusive grounds: (1) that it was void, in which case the United States owed the Tribe damages essentially for trespass, and (2) that it constituted an uncompensated taking of tribal lands. In 1976, the Commission transferred Docket No. 320 to the Court of Claims. In the meantime, the Tribe asked the Interior Department to reconsider the Margold Opinion. Ultimately, in a 1978 Secretarial Order, the Department changed its position and confirmed the Tribe's entitlement to most of the disputed lands. A few months after this Court decided in Arizona II that the 1978 Secretarial Order did not constitute a final determination of reservation boundaries, the United States and the Tribe entered into a settlement of Docket No. 320, which the Court of Claims approved and entered as its final judgment. Under the settlement, the United States agreed to pay the Tribe $15 million in full satisfaction of the Tribe's Docket No. 320 claims, and the Tribe agreed that it would not further assert those claims against the Government. In 1989, this Court granted the motion of Arizona, California, and two municipal water districts (State parties) to reopen the 1964 decree to determine whether the Fort Yuma, Colorado River, and Fort Mojave Reservations were entitled to claim additional boundary lands and, if so, additional water rights. The State parties assert here that the Fort Yuma claims of the Tribe and the United States are precluded by Arizona I and by the Claims Court consent judgment in Docket No. 320. The Special Master has prepared a report recommending that the Court reject the first ground for preclusion but accept the second. The State parties have filed exceptions to the Special Master's

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