Arizona stares down federal Colorado River cuts as CAP exposure looms

Arizona is staring at federally directed Colorado River cuts after the Bureau of Reclamation finalized an "adaptive decision framework" that could trim Lower Basin withdrawals by up to 3 million acre-feet a year through 2036. Arizona, California and Nevada officials pushed back, but the plan would begin next year and be revisited every two years based on basin conditions.

The consequence lands fastest on Arizona's Central Arizona Project. Under the priority system, Arizona holds the weakest Lower Basin claim, and experts say reductions would likely fall on CAP deliveries to Maricopa, Pinal and Pima counties. A California official called the federal blueprint a guideline, not the final word, but the signal from Washington is unmistakable: plan for less water.

Gov. Katie Hobbs said she hopes the bureau follows a Lower Basin compromise for the first two years, which would mean far smaller reductions through 2028 than the federal maximums. "I'm not going to lie, the cuts will be painful, but certainly not as painful as what was proposed in the federal government's draft," Hobbs said. Hope is not certainty, and CAP users cannot budget on vibes.

Arizona Senate President Warren Petersen and President Pro Tem T.J. Shope, both Republicans, warned the framework would put Arizona at risk of shouldering a disproportionate share while requiring no reductions from the Upper Basin. Nevada Gov. Joe Lombardo, a Republican, called the potential impacts on his state "devastating." The opposition is broad because the exposure is real.

The Bureau's new framework replaces 2007 guidelines expiring at year's end, after state talks stalled. The river's basic math is brutal. "The flow of the river now is 20% less than it was at the start of the century," said Doug Kenney of the University of Colorado, citing drought, rising temperatures and shrinking snowpack.

On top of consumptive cuts, the bureau floated limiting releases from Lake Powell to as little as 5 million acre-feet, well below the 7.5 million acre-feet the Lower Basin typically relies on. That would tighten the vise on Lake Mead and cascade into deeper Lower Basin shortages if hydrology sours.

All three Lower Basin states have urged Washington to adopt their May deal to conserve 3.2 million acre-feet over two years, including 1.25 million acre-feet of binding reductions in both 2027 and 2028, plus at least 700,000 acre-feet of additional conservation. Sarah Porter of ASU's Kyl Center said she does not expect the bureau to impose the deepest cuts in the next two years and anticipates something along the Lower Basin lines initially.

Litigation is possible over the federal process under NEPA or the application of the 1922 Compact, with any state-on-state fight going straight to the U.S. Supreme Court. But Celene Hawkins of The Nature Conservancy warned that long lawsuits "can't actually create more water or solve problems in the short term for the basin."

Arizona needs nuts-and-bolts answers while the legal clouds gather. If CAP takes the hit first, how will cities sequence drought stages, and how will Pinal agriculture bridge multiple years of uncertainty. If Powell releases sag to 5 million acre-feet, are industrial and housing approvals prepared for a drier baseline. Hobbs' public stance leans on Washington to honor the Lower Basin deal for two years; that buys time only if state agencies and water users have a concrete intrastate playbook ready now.

Experts expect the near-term cuts to mirror the Lower Basin plan, but the framework reaches to 2036. If the river keeps shrinking, the federal ratchet tightens. For Arizona, that means treating these next two years as a narrow window to harden supplies, prioritize within CAP, and insulate growth from shortages that are no longer hypothetical.

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