The Colorado River, one of North America’s major waterways, is edging closer to a breaking point. After years of failed negotiations between the seven states that depend on its basin, the US federal government has decided to intervene directly with a new emergency plan that could lead to drastic water cuts for cities, agriculture and businesses, especially in Arizona.
The announcement comes after Arizona, California, Nevada, Colorado, Utah, Wyoming and New Mexico failed to agree on management of the river beyond 2026, when the current operating rules for the large reservoirs of Lake Mead and Lake Powell expire.
For more than 40 million people, the Colorado River is a vital source of drinking water, irrigation and hydroelectric power. But decades of overexploitation, urban growth, intensive agriculture and the climate crisis have progressively dried up the system.
Over the past twenty years the basin has been hit by an unprecedented “megadrought”, aggravated by rising temperatures and decreasing snowfall in the Rocky Mountains, on which much of the river’s flow depends. Levels at Lake Mead and Lake Powell – the system’s two main reservoirs – remain near critical thresholds.
According to a note from the Bureau of Reclamation, the federal agency that manages Colorado’s water system, the inflow to Lake Powell has decreased by about 1.5 million acre-feet alone since the beginning of 2026. A situation that puts at risk not only water supplies but also hydroelectric energy production.
The federal plan
In the face of political stalemate, Washington is working on a new 10-year operational plan that calls for mandatory cuts to water supplies, to be reassessed every two years based on basin levels.
According to initial reports, the reductions could be up to 40% of current supplies for the Lower Basin states — Arizona, California and Nevada — with an overall cut of up to 3 million acre-feet per year, enough to supply between 6 and 9 million homes. Arizona risks being the hardest hit state. The Central Arizona Project (CAP), the giant canal that brings Colorado water to Phoenix and Tucson, could see reductions so severe that it will wipe out some supplies in the worst years.
The conflict mainly concerns the division of responsibilities. The Lower Basin states accuse those in the upper basin – Colorado, Utah, Wyoming and New Mexico – of not wanting to contribute enough to the cuts. The Upper Basin states, however, argue that California, Arizona and Nevada have for decades consumed more water than is actually available.
A few weeks ago, Arizona, California and Nevada presented an alternative proposal based on voluntary cuts through 2028, with an estimated savings of more than 3.2 million acre-feet. But it’s unclear whether the federal government will accept this solution or proceed with a more stringent stand-alone plan.
The Colorado River crisis is now considered one of the clearest examples of how the climate crisis is putting pressure on global water systems. According to many experts, the problem is no longer just temporary drought, but a structural process of “aridification” in the South-West of the United States: higher temperatures in fact mean greater evaporation, less accumulated snow and therefore less water available in the summer months.
And as states continue to argue over quotas, time is running out. The Bureau of Reclamation is expected to announce its next steps by the summer, but one thing is now clear: the water management model built over the last century is no longer sustainable in a changing climate.
