The US government has unveiled its long-anticipated strategy to manage the deepening Colorado River crisis, proposing significant water supply reductions for the key southwestern states of California, Arizona, and Nevada.

Under the new federal proposal, these so-called lower basin states face potential cuts of up to 3 million acre-feet (3.7 billion kilolitres) of water each year. This volume represents approximately 40% of their combined annual allocation and is sufficient to supply more than 25 million people.

The drastic measures, announced on Friday, come as the Colorado River system continues to suffer from decades of severe drought and over-allocation, pushing its major reservoirs to critically low levels. Officials described the plan as a necessary, though likely temporary, fix for the escalating environmental and economic challenge.

Lower Basin States Face Significant Reductions

California, Arizona, and Nevada are the primary states affected by these proposed cutbacks. The Colorado River Compact, established in 1922, divides the river's water among seven US states and Mexico.

While the lower basin states confront substantial reductions, the plan also acknowledges the challenges faced by the upper basin states — Colorado, Utah, Wyoming, and New Mexico — which have also experienced diminished flows.

The government's proposal follows years of negotiations and increasing pressure for a sustainable solution to secure water resources for millions of residents and vast agricultural operations across the region.

Colorado River drought affected landscape

Temporary Fix Amid Long-Term Crisis

The federal plan aims to stabilise the critical river system in the near term, but it does not offer a permanent solution to the fundamental imbalance between water supply and demand. Experts warn that the underlying issues of climate change-driven drought and historical over-allocation persist.

The effectiveness of these proposed cuts will depend on their implementation and the willingness of all basin states to collaborate on a more comprehensive, long-term strategy. Future hydrological conditions, particularly annual snowfall in the Rocky Mountains which feeds the river, will also play a crucial role.

The US government has unveiled its long-anticipated strategy to manage the deepening Colorado River crisis, proposing significant water supply reductions for the key southwestern states of California, Arizona, and Nevada.

Discussions are expected to continue among state and federal officials as they work towards finalising agreements that balance the competing demands of urban populations, agriculture, industry, and the river's ecological health.