USBR - Water Levels At Glen Canyon Dam May Fall Low Enough To Stop Electricity Generation By December 2026 [View all]

Federal officials reported Tuesday that the water level in Lake Powell, one of the main water storage reservoirs for the Colorado River Basin, could fall low enough to stop hydropower generation at the reservoir by December 2026. The reservoir’s water levels have fallen as the Colorado River Basin, the water supply for 40 million people, has been overstressed by rising temperatures, prolonged drought and relentless demand. Upper Basin officials sounded the alarm in June, saying this year’s conditions echo the extreme conditions of 2021 and 2022, when Lake Powell and its sister reservoir, Lake Mead, dropped to historic lows.

The basin needs a different management approach, specifically one that is more closely tied to the actual water supply each year, the Upper Colorado River Commission’s statement said. The seven basin states, including Colorado, are in high-stakes negotiations over how to manage the basin’s water after 2026. One of the biggest impasses has been how to cut water use in the basin’s driest years.

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The Bureau of Reclamation’s July report, called a 24-month study, shows the potential for Lake Powell to decline below two critical elevations: 3,525 feet and 3,490 feet. It could drop below 3,525 feet in April 2026, which would prompt emergency drought response actions. That’s in the most probable scenario, but the federal agency also considers drier and wetter forecast scenarios. The dry forecast shows that the reservoir’s water levels would fall below this elevation as soon as January. Lake Powell would have to fall below 3,490 feet in order to halt power generation.

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Hydroelectric power generation takes a hit with lower water levels at Lake Powell and Lake Mead. Reclamation’s dry conditions forecast says Lake Powell could fall below 3,490 feet by December 2026, and Lake Mead’s water level could fall below a key elevation, 1,035 feet, by May 2027. At that point, Hoover Dam would have to turn off several turbines and its power production would be significantly reduced, said Eric Kuhn, a Colorado water expert. In more typical or unusually wet forecasts, neither reservoir would fall below these critical elevations in the next two years, according to the report.

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https://coloradosun.com/2025/07/17/lake-powell-colorado-hydropower-water-levels/