Arizona, California and Nevada on Monday proposed a plan to significantly reduce their water use from the drought-stricken Colorado River over the next three years, a potential breakthrough in a year-long stalemate that pitted Western states against one another.

The plan would conserve an additional 3 million acre-feet of water through 2026, when current guidelines for how the river is shared expire. About half the cuts would come by the end of 2024. That's less than what federal officials said last year would be needed to stave off crisis in the river but still marks a notable step in long and difficult negotiations between the three states.

The 1,450-mile river provides water to 40 million people in seven U.S. states, parts of Mexico and more than two dozen Native American tribes. It produces hydropower and supplies water to farms that grow most of the nation's winter vegetables.

In exchange for temporarily using less water, cities, irrigation districts and Native American tribes in the three states will receive federal funding, though officials did not say how much they expected to receive.

Though adoption of the plan isn't certain, U.S. Bureau of Reclamation Commissioner Camille Touton called it an "important step forward." She said the bureau will pull back its proposal from last month that could have resulted in sidestepping the existing water priority system to force cuts while it analyzes the three-state plan. The bureau's earlier proposal, if adopted, could have led to a messy legal battle.

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"At least they’re still talking. But money helps you keep talking," said Terry Fulp, former regional director of the U.S. Bureau of Reclamation’s Lower Colorado Basin region. He noted the agreement is a "short-term, three-year deal" and that because the Upper Basin states of Colorado, New Mexico, Utah, and Wyoming didn’t face immediate cuts, they were not part of the pact.

"The goal was so the government didn’t have to issue a mandate" based on priority rights, he said. "It looks like that’s what’s going to happen."

The three Lower Basin states are entitled to 7.5 million acre-feet of water altogether from the river. An acre-foot of water is roughly enough to serve two to three U.S. households annually.

California gets the most, based on a century-old water rights priority system. Most of that goes to farmers in the Imperial Irrigation District, though some also goes to smaller water districts and cities across Southern California. Arizona and Nevada have already faced cuts in recent years as key reservoir levels dropped based on prior agreements. But California has been spared.

Under the new proposal, California would give up about 1.6 million acre-feet of water through 2026 — a little more than half of the total. That's roughly the same amount the state first offered six months ago. It wasn't clear why the other states agreed to a deal now when California didn't offer further cuts. Leaders in Arizona and Nevada didn't immediately say how they'd divide the other 1.4 million acre feet.

The Imperial Irrigation District would account for more than half of California’s cuts. J.B. Hamby, chairman of the Colorado River Board of California, said the district has already taken measures to improve water efficiency and will need to do more. He said the district is working on a pilot summer idling program where farmers would sign up to turn off their water for 60 days for forage crops. During that time of year, yields are already down and more water is required, he said.

Tom Buschatzke, director of the Arizona Department of Water Resources, stressed that the announcement is not a final deal.

"We agreed to a proposal. This is not an agreement," Buschatzke said during a conference call with reporters. Buschatzke said the proposal still needs analysis and approval from the federal government, which will determine how much funding will be allocated for entities that give up water.

Arizona Gov. Katie Hobbs said the deal provided a way to "build our reservoirs back up in the near-term," but added that work remained to address long-term effects of climate change and overallocation. Govs. Gavin Newsom of California and Joe Lombardo of Nevada also praised the agreement.

Becky Mitchell, director of the Colorado Water Conservation Board, said on Monday that Upper Basin states didn’t have a chance to analyze Arizona, Nevada and California’s plan in detail. The plan doesn’t change how much water the Upper Basin states of Colorado, New Mexico, Utah or Wyoming will receive.

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"The wet winter has given us a bit of space to negotiate, but we must not squander this gift from Mother Nature," Mitchell said. She said Colorado and other basin states urged federal officials to return to longer-term discussions about how to preserve water levels at Lakes Mead and Powell beyond 2026.

The Colorado River has been in crisis for years due to a multi-decade drought in the West intensified by climate change, rising demand and overuse. Water levels at key reservoirs dipped to unprecedented lows, though they have rebounded somewhat thanks to heavy precipitation this winter.

In recent years the federal government has cut some water allocations and offered billions of dollars to pay farmers, cities and others to cut back. But key water officials didn't see those efforts as enough to prevent the system from collapsing.

Last summer, the U.S. Bureau of Reclamation called for the seven basin states to figure out how to cut their collective use of Colorado River water by about 2 to 4 million acre feet in 2023 alone — roughly 15% to 30% of their annual use — but states blew past that deadline and an agreement remained elusive for several more months.

In April, the U.S. Bureau of Reclamation released a plan that considered two ways to force cuts for Arizona, Nevada and California. One contemplated using a decades-old water priority system that would have benefited California and some Native American tribes with senior water rights. The other would have been a percentage cut across the board.

Michael Cohen, a senior researcher at the Pacific Institute focused on the Colorado River, called the amount of cuts the three states have proposed a "huge, huge lift" and a significant step forward.

"It does buy us a little additional time," he said. But if more dry years are ahead, "this agreement will not solve that problem."