Negotiations among seven U.S. states over Colorado River water allocations have stalled, missing key deadlines as reservoirs hit record lows after the driest winter in decades. The Trump administration may impose unilateral cuts if no agreement is reached by September, potentially disrupting economies in Arizona and beyond. Tensions persist between Upper and Lower Basin states over sharing reductions in the river's shrinking flow.
The Colorado River, vital for 40 million people and $1.4 trillion in annual economic activity across seven states and Mexico, faces severe strain from a 20 percent decline in flow over the past century due to climate change. A century-old legal framework allocates more water than available, sparking disputes between the Upper Basin states—Colorado, Utah, Wyoming, and New Mexico, home to hay farmers and cities like Denver—and the Lower Basin states, which support winter vegetable production and megacities such as Los Angeles and Phoenix.
By the end of September, the states must agree on rules for dividing water during dry years, but talks have broken down. Negotiators missed deadlines in November and February, with Colorado's representative stating the Upper Basin is “being asked to solve a problem we didn’t create with water we don’t have,” while Arizona's side noted it had “offered numerous, good-faith compromises” that were rejected.
A nearly snow-free winter has pushed reservoirs like Lake Powell and Lake Mead toward historic lows, risking a halt in hydropower production at Lake Powell this year. Without a deal, Interior Secretary Doug Burgum's department plans to allocate water by historical priority, sparing senior rights holders but cutting nearly all supply to junior users in the Phoenix area—over 1 million acre-feet—threatening farms, development, and groundwater.
The core disagreement centers on cuts: Lower Basin states demand mandatory reductions from the Upper Basin, which relies on variable snowmelt and claims automatic “hydrologic shortages” suffice. Brad Udall, a water researcher at Colorado State University, described this as the key issue, noting the Upper Basin uses about 4.5 million acre-feet annually with little variation. Arizona's Tom Buschatzke said, “We have offered to do more, but we simply cannot take on the task of saving this precious river system on our own.” Upper Basin farmer Steve Pope called mandatory cuts “ridiculous” amid existing uncertainties.
The Biden administration averted crisis in 2022 through emergency Lower Basin deals and 2023 snowpack relief, but current talks seek 20-year rules. Nevada's John Entsminger remains optimistic for a short-term pact based on “natural flow” measurements to adapt to climate variability. Preparations include Arizona's desalination plans, Las Vegas lawn removals, and Utah farmer incentives. Litigation looms regardless, as Ted Cooke, former Central Arizona Project manager, highlighted federal timidity in regulating Upper Basin use. John Berggren of Western Resource Advocates warned that court battles risk all users.
