- Federal officials may review Colorado River water cuts every two years.
- Arizona leaders warn some modeled shortages could heavily impact CAP deliveries.
- Lower Basin states have proposed major conservation measures through 2028.
Saturday, May 17, 2026 — According to The Arizona Republic,
federal water officials are now considering a new approach for managing the shrinking Colorado River that would rely on a 10-year framework with water-sharing rules reviewed every two years instead of locking in one long-term agreement. The shift comes as drought, declining Rocky Mountain snowpack, and ongoing disputes between the Upper Basin and Lower Basin states continue to complicate negotiations over the river’s future. Arizona officials say the shorter review periods could provide flexibility as conditions change, but they also create uncertainty for cities, tribes, farmers, and water agencies that depend heavily on Colorado River supplies. The Lower Basin states of Arizona, California, and Nevada recently submitted a proposal that would conserve more than 3 million acre-feet of water through 2028, an effort Arizona leaders believe could help stabilize deliveries through the Central Arizona Project Canal.
The Arizona Republic also reported that federal officials are modeling severe shortage scenarios that could reduce Lower Basin deliveries by as much as 40%, a possibility that Arizona officials described as alarming and potentially devastating. Such cuts could heavily impact Central Arizona Project water deliveries to Phoenix and Tucson, especially because some of those supplies hold lower legal priority under the river’s century-old allocation system. At the same time, tensions remain between the Upper Basin and Lower Basin states over who should bear the largest reductions as river flows continue to decline. Arizona has reportedly prepared for possible legal action if federal officials impose deeper cuts without requiring additional sacrifices from upstream states. Federal officials say the new two-year review structure would allow future adjustments as river conditions evolve and negotiations continue.
