State of Arizona v. State of California Bill of Complaint

Background

The case involves the Quechan (Fort Yuma) Tribe, the United States acting for the Tribe, and state and municipal water interests in Arizona and California fighting over who may claim water from the Colorado River for lands at the edge of the Fort Yuma Reservation. The dispute traces to an 1893 agreement about 25,000 acres, a 1936 Margold Opinion saying the Tribe ceded the lands, a 1978 Secretarial Order recognizing tribal title, and a 1983 Claims Court settlement that paid the Tribe $15 million in Docket No. 320.

Reasoning

The core question was whether earlier rulings or the 1983 consent judgment bar the United States and the Tribe from seeking extra water tied to the disputed lands. The Court held that Arizona I’s finality principle cannot be wielded now because the State parties failed to raise that defense earlier. The Court also ruled the Claims Court settlement does not clearly decide ownership issues and thus cannot preclude the Tribe’s or the United States’ water claims. The Court overruled the Special Master on those preclusion points, remanded Fort Yuma boundary-based water claims for merits review, and approved proposed settlements for the Fort Mojave and Colorado River reservations.

Real world impact

The ruling lets the Fort Yuma water claims proceed on the merits, so tribal, state, and municipal water allocations could change depending on the Special Master’s further findings. The decision implements agreed settlements that allocate specific additional acre-feet to Fort Mojave and Colorado River reservations now. The Fort Yuma outcome is not final and could change after further proceedings.

Dissents or concurrances

Chief Justice Rehnquist, joined by two Justices, disagreed and would have held the Fort Yuma claims barred by res judicata, opposing the remand and preferring final resolution now.