U.S. Geological Survey staff check monitoring equipment in Suicide Basin in June 2025. By August, the basin had filled with meltwater.

Each summer in the mountains above Juneau, Alaska, meltwater from the massive Mendenhall Glacier flows into mountain lakes and into the Mendenhall River, which runs through town.

Since 2011, scientists and local officials have kept a close eye on one lake in particular: Suicide Basin, an ice-dammed bowl on an arm of the glacier. Glacier ice once covered this area, but as the ice retreated in recent decades, it left behind a large, deep depression.

Originally published on theconversation.com, part of the BLOX Digital Content Exchange.

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