Arizona joins Nevada in court fight over Colorado River cuts

What This is

• Arizona filed to intervene in Nevada’s federal lawsuit to block the Interior Department’s adopted Colorado River water-cut plan.
• The federal plan could cut deliveries to Arizona, California, and Nevada by about 20% over the next two years, with large reductions assigned to Arizona.
• Arizona officials cite a required 760,000 acre-foot cut under the plan, and federal scenarios have floated even deeper cuts for the state.
• The fight is tied to extremely low reservoir levels at Lake Mead and Lake Powell after years of drought, climate-driven declines, and long-term overuse of the river.
• Arizona officials warn the reductions could severely limit the Central Arizona Project canal system that delivers Colorado River water to much of central and southern Arizona.
• The federal plan followed unsuccessful negotiations among the seven Colorado River states over how to share a shrinking supply.

Why This Matters

• The case could clarify how the federal government can force water cuts when states cannot agree.
• Reduced river deliveries could increase pressure on groundwater reserves and alternative water supplies.
• Big cuts would test how cities and farms in the Southwest adapt to a drier climate and less reliable snowmelt.
• A prolonged court fight could slow planning and investment needed to conserve water and manage future shortages.