Overview
- The Interior Department finalized a 10‑year framework and on Aug. 21 ordered mandatory cuts that require Arizona, California and Nevada to trim Lower Basin use by 1.25 million acre‑feet in 2027–2028 and obligate Mexico to cut 250,000 acre‑feet under the binational treaty.
- The plan allocates the deepest share to Arizona (about 760,000 acre‑feet), California about 440,000 acre‑feet, and Nevada about 50,000 acre‑feet, with contingency language that allows larger reductions if reservoir levels keep falling.
- Lake Mead and Lake Powell are at record low storage and are close to elevations that would force turbines offline and sharply reduce Hoover and Glen Canyon hydropower generation, raising the prospect of a 'deadpool' that would halt outflows through the dams.
- The cuts have prompted immediate legal and political pushback, including a Nevada lawsuit and ongoing seven‑state negotiations, and they heighten economic and social strain on farmers, cities and dozens of Native American tribes that rely on the river.
- Longer‑term risks remain unresolved because the October expiration of current operating rules, the short‑term nature of the framework, delayed infrastructure fixes such as new Hoover turbines not due until late 2028, and national‑security concerns over military water supplies and groundwater‑driven infrastructure damage.