The Bureau of Reclamation published the Final Environmental Impact Statement for future Colorado River operations, establishing a 10-year framework for managing Lake Powell and Lake Mead that will govern water delivery for roughly 40 million people, on July 31.
The framework is designed to ensure reliable water operations through 2036 for seven Basin states — Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming — and the federal government, the bureau said.
The decision concludes a years-long renegotiation process for post-2026 Colorado River operating guidelines. The previous guidelines were set to expire, requiring a new agreement among the Basin states and federal agencies that manage the river system.
Lake Mead and Lake Powell, the two largest reservoirs in the United States, have been subject to historically low water levels in recent years due to a combination of prolonged drought and decades of overallocation. Water levels at both reservoirs have partially recovered but remain well below historical averages.
The new framework uses an adaptive decision-making approach, allowing operating rules to adjust as hydrological conditions change over the decade. The flexibility is intended to avoid the crisis-level negotiations that characterized prior drought responses.
The Colorado River supplies water to approximately 40 million people and irrigates 4 to 5 million acres of farmland across the American Southwest and northern Mexico. The river also generates hydroelectric power at Glen Canyon Dam and Hoover Dam.
Agricultural users, municipal water providers, Native American tribes and environmental groups all have stakes in the operating framework. The final EIS incorporates input from extensive public comment periods and intergovernmental negotiations.