CRIT warns federal Colorado River plan could threaten senior water rights

Colorado River Indian Tribes warned that the federal government’s next Colorado River operating plan could weaken the Tribe’s senior water rights on the Lower Colorado River, a move that would directly affect water control, allocation and future precedent in Parker and across La Paz County.

In formal comments dated Feb. 25, 2026, CRIT told the Bureau of Reclamation it wanted any alternative that would distribute shortages pro rata removed from the post-2026 environmental review. The Tribe said that approach would treat all users as if they held the same claim on the river, even though CRIT says its decreed right dates to 1865 and carries the first priority for 719,248 acre-feet a year.

That entitlement, according to federal and tribal materials, includes 662,402 acre-feet in Arizona and 56,846 acre-feet in California, enough to serve 107,903 acres of irrigable land. The water is delivered through the Colorado River Indian Irrigation Project, which supplies agricultural users on the reservation in Parker. CRIT argued that a pro-rata shortage formula would ignore the Arizona v. California decree, the Winters Doctrine, prior appropriation, the federal trust obligation and the Fifth Amendment.

The Tribe’s objection lands in the middle of a broader basin fight over who absorbs cuts as the current system runs out. Reclamation’s draft says the drought began in 2000 and that Lake Powell and Lake Mead have fallen to historically low elevations. The 2007 Interim Guidelines, the 2019 Drought Contingency Plans and key U.S.-Mexico agreements all expire in 2026, leaving the agency to design a new operating framework for one of the nation’s most stressed river systems.

CRIT said it raised these concerns in government-to-government consultation on Feb. 18, 2026, before submitting its written comments. The Tribe also thanked Reclamation for help with funding upgrades to the Colorado River Indian Irrigation Project and for designing a re-regulating reservoir to address inefficiencies in the system, which is operated with Bureau of Indian Affairs involvement.

The legal stakes are rooted in Arizona v. California, the Supreme Court case that began in 1952, when the United States intervened to protect reserved water rights for five Indian reservations, including the Colorado River Indian Reservation. The Court’s consolidated decree was entered on March 27, 2006. CRIT’s tribal government says the reservation is overseen by a nine-member Tribal Council, and Chairwoman Amelia Flores has been one of the Tribe’s most visible voices on river policy.

Reclamation released its draft plan on Jan. 9, 2026, held public meetings on Jan. 29 and Feb. 10, and closed the comment period on March 2 after receiving 18,127 submissions. For Parker, La Paz County and the farmers who depend on the river corridor, the fight is no longer abstract: it will help decide whether senior tribal rights stay intact, or whether future shortages get spread in a way CRIT says would rewrite settled law.