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Arizona will again go without 18% of its total Colorado River allocation, while Mexico loses 5%. The reduction for Nevada — which receives far less water than Arizona, California or Mexico — will stay at 7%. California won't face any cuts because it has senior water rights and is the last to lose in times of shortage.

Decades of overuse and the effects of long-term drought worsened by climate change means there’s far more demand for water than what actually flows through the river. Low reservoir levels at Lake Mead have triggered mandatory cutbacks with the deepest cuts in 2023, which hit farmers in Arizona the hardest.

Meanwhile, the states are working to reach agreement by next year on new long-term rules to govern the river in dry years. The Trump administration gave a mid-November deadline for states to reach a preliminary agreement, or risk federal intervention. Negotiations have faced delays as states push back against how much water they should each give up.

The original was calculated based on an amount of water that doesn't exist in today's climate. That leaves the Upper Basin states of New Mexico, Colorado, Wyoming and Utah to share far less water after the required amount is sent to the to the “Lower Basin� states of Nevada, Arizona and California. Lots of water is also lost to evaporation and leaky infrastructure.

Fairly splitting the river's water in the era of climate change has been vexing for years, with all of the major users hesitant to give anything up as they anticipate a drier future. There has to be enough water in the reservoirs to reach the tunnels that usher water downstream, and ideally, even more water for hydropower generation. Key infrastructure like the Hoover Dam rely on certain water levels in Lake Mead to generate electricity.

Mandatory cuts and emergency water releases are “reactive," said John Berggren, a regional policy manager at Western Resource Advocates, a nonprofit focused on climate change.

“If we are going to be able to have a sustainable Colorado River and not just be responding to crisis after crisis, we need large amounts of flexibility built into this new set of guidelines," he said.

“We can and must do better. Nature isn’t waiting for us,� said Becky Mitchell, Colorado’s commissioner in the Upper Colorado River Commission.

States are considering a so-called natural flow approach to managing the river — where the Lower Basin would receive a certain percentage of the average natural flow from the prior few years.

The Lower Basin states have helped stave off deeper cuts by coming up with voluntary conservation plans.

“Absent all of those measures, the river would be in a very bad place,� said J.B. Hamby, chairman of the Colorado River Board of California and a board member for the Imperial Irrigation District, the largest user of the river's water. Still, he knows California, like others, will likely have to give up more in the negotiations.

Dozens of conservation projects along for Upper Basin states and tribes are in limbo. President Donald Trump froze yet-to-be-distributed Inflation Reduction Act funds on his first day in office, which included nearly $400 million for those projects. The entire Colorado congressional delegation signed a letter earlier this month urging the release their portion of those funds.

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This story has been corrected to remove a reference to the third year of cuts in the headline. The cuts announced Friday are set for 2026, which will be the fifth year. ___

Associated Press journalists Amy Taxin in Tustin, California, and Mead Gruver in Fort Collins, Colorado, contributed to this report.

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