Drought pushes Lake Mead to a record low

America's biggest reservoirs are running low. Lake Mead and Lake Powell, the two largest in the country, both hit record-low levels in 2026. A years-long drought in the Colorado River basin is why. These reservoirs don't just hold drinking water. They also feed Hoover Dam and Glen Canyon Dam, two of the country's biggest hydropower plants.

Hydropower is usually one of the most reliable kinds of clean energy. Rain and snow fall, rivers fill, dams spin turbines. It doesn't depend on sunny days or windy nights the way solar and wind do. But it does depend on water actually being there. The Colorado River basin has been drying out for years. In 2026, that pushed both Lake Mead and Lake Powell to their lowest points ever recorded. The federal government's own energy data expects hydropower output nationwide to recover once the snow drought eases.

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How much lower can these reservoirs go before dams stop working? Hoover Dam and Glen Canyon Dam both need a minimum water level just to keep generating power at all. The Bureau of Reclamation has already taken steps to protect that minimum, like releasing less water downstream. This isn't a crisis with a fast fix. Rain and snow patterns take years to shift. So the dams will likely keep running with less power for a long time to come.