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Lake Powell Projected to Fall to Minimum Power Pool, Threatening Glen Canyon Hydropower

Federal modeling and independent scientists say record-low inflows driven by a warming, drier West make hydropower loss and wider system strain likely next year.

Overview

  • The Bureau of Reclamation's mid-June 24-month study, released June 15, projects Lake Powell will reach its "minimum power pool" by next spring if current low inflows continue.
  • Lake Powell is at a record low for the summer at roughly 23% capacity, and federal managers have started emergency transfers from upstream reservoirs such as Wyoming’s Flaming Gorge to slow the decline.
  • If the reservoir drops below minimum power pool, water can no longer flow through Glen Canyon Dam’s turbines and generators would stop producing electricity, with knock-on risks for Lake Mead and Hoover Dam downstream.
  • The crisis has heightened political clashes between Upper and Lower Basin states, complicated by the absence of a long-term basin-wide cuts plan and a still-unconfirmed Bureau of Reclamation leadership nominee.
  • Researchers warn that another dry year would likely push the system to "run-of-the-river" operations with severe impacts on irrigation, municipal supply, recreation and regional jobs, and that only sustained use reductions or big investments would offer more than a temporary reprieve.