Federal officials finalize Colorado River cuts for 2027 and 2028

The Interior Department has finalized new operating rules for the Colorado River, reducing Lower Basin water deliveries in 2027 and 2028 as Lake Powell and Lake Mead reach historically low levels.

Interior Secretary Doug Burgum signed the 2027-2028 Colorado River Operating Guidelines and an accompanying Record of Decision on August 21, 2026. The action came after the seven Colorado River Basin states failed to reach consensus on how to manage the strained river system.

The rules take effect with the 2027 operating year, which begins October 1, 2026. They are final agency action for those two years, but they are not a permanent settlement of the broader dispute over the river’s future.

What the new rules change

Lower Basin consumptive-use deliveries will be limited to 6.25 million acre-feet in each of calendar years 2027 and 2028. That is a reduction of 1.25 million acre-feet from the 7.5 million acre-feet apportioned under normal conditions.

Under the anticipated Lower Basin implementing agreement, the annual reduction would be distributed as 760,000 acre-feet for Arizona, 440,000 for California and 50,000 for Nevada. Those figures are not separate state laws enacted independently by each state. If the necessary implementing agreements are not fully executed, the Secretary of the Interior will determine the quantities and apportionment under applicable law.

The guidelines also call for Lower Basin contractors to conserve and store an additional 700,000 acre-feet of system-conservation water in total during 2026, 2027 and 2028 through voluntary agreements. That cumulative conservation target is separate from the 1.25 million acre-feet annual delivery reduction.

Why the federal government acted

The Colorado River supplies water to cities, farms, tribes and industries across seven Western states. It also supports hydropower generation at Glen Canyon Dam and Hoover Dam. Existing operating arrangements were nearing expiration, while negotiations over a longer-term agreement remained unresolved.

The Record of Decision says combined contents in Lake Powell and Lake Mead were about 12.5 million acre-feet when the decision was adopted. The document says that was the lowest combined storage since before Lake Powell began filling after Glen Canyon Dam closed in 1963. The Associated Press separately reported record-low elevations at both major reservoirs during August.

Low levels at Lake Powell create operational concerns for Glen Canyon Dam, including the reliability and flexibility of water releases and hydropower production. The federal documents describe risks that the new operating measures are intended to manage; they do not say that Glen Canyon Dam or Hoover Dam is failing.

For the 2027 water year, Reclamation’s August 24-Month Study placed Lake Powell in the lower-elevation infrastructure-protection range, with an expected release between 6.0 million and 7.0 million acre-feet. Reclamation said the release will be adjusted as needed to try to keep the reservoir at or above elevation 3,510 feet.

The rules extend beyond 2028

The federal action also establishes a 2027-2036 Decision Framework for future two-year operating guidelines. The framework sets broad operating parameters and preserves room for continued negotiations among the states, tribes, water contractors, federal agencies and Mexico.

Future releases and reservoir operations will remain subject to changing hydrology, Reclamation’s 24-Month Study and annual operating decisions. A later consensus agreement could replace or modify portions of the two-year rules within the framework.

What water users should watch

Arizona, California and Nevada water users are the most directly exposed to the Lower Basin reductions. The effects will vary by state, water contractor, city, farm, tribe and conservation agreement, so the federal action does not translate into one fixed immediate cut for every household or farm.

The broader consequences extend across the basin. Lower reservoir levels affect municipal and agricultural supplies, hydropower, recreation and river ecosystems. Federal environmental documents also address threats to native fish and critical habitat, warmer releases and low-flow conditions.

The next major milestones include any Lower Basin implementation agreements, the October 1, 2026 start of new operations, Reclamation’s 2027 annual operating decisions and the next guideline-development process, which must begin no later than October 1, 2027. The federal framework also leaves open the possibility of additional changes if hydrology or operational risks worsen.

Sources

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