“At issue is whether it’s fair to use century-old rules, created during an era of relative abundance, to ration water from the rapidly shriveling river now that the West is on the precipice of climate disaster. With California and its six neighbors locked in a dispute over two competing approaches to divvying up the cuts in water deliveries, whatever the administration decides will almost certainly end up in court.”
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“The current feud centers on California, a longtime Democratic stronghold, and Arizona, a newfound swing state that has proven crucial to the party’s control of the White House and Senate.
The 1,450-mile long Colorado River made much of the West inhabitable, and now supplies water to 40 million Americans from Wyoming to the border with Mexico, as well as an enormously productive agricultural industry. But climate change has shriveled its flows by 20 percent over the past two decades, and for each additional degree of warming, scientists predict the river will shrink another 9 percent.
Water levels at the system’s two main reservoirs are falling so fast, the Interior Department has said that water users must cut consumption by as much as a third of the river’s flows or risk a collapse that could cripple their ability to deliver water out of those dams. That would also cut off hydropower production that is crucial to the stability of the Western grid.
The states broadly agree that the vast majority of those immediate cuts must be made by the Lower Basin states of Arizona, California and Nevada, whose decades of overuse have accelerated the crisis. But the fight is over whether California, which holds strong legal rights to the lion’s share of the Lower Basin’s water, should have to share in those reductions.”
https://www.politico.com/news/2023/02/04/colorado-river-biden-climate-change-water-00080990