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Glacial lake flood hits Juneau, Alaska, reflecting a growing global risk as mountain glaciers melt

  • Written by Alton C. Byers, Faculty Research Scientist, Institute of Arctic and Alpine Research, University of Colorado Boulder
Glacial lake flood hits Juneau, Alaska, reflecting a growing global risk as mountain glaciers meltU.S. Geological Survey staff check monitoring equipment in Suicide Basin in June 2025. By August, the basin had filled with meltwater.Jeff Conaway/U.S. Geological Survey

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.

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