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On August 6th, 2024, the Mendenhall River rose nearly 16 feet over the course of 12 hours, and caused the flooding of over 300 homes as an estimated 16 billion gallons of water trapped under the glacier was released in less than a 48-hour period. The huge volume of water came rushing down the restrictive canyon of the Mendenhall River which has been carved out by thousands of years of glacial activity. Along the way, the torrent of water caused huge evergreen trees that stood over 200’ tall to fall down as the soil below them was eroded and lost to the river.
To combat this happening again HESCO flood barriers were installed along the Mendenhall River May 2025 to protect the residents of the City and Borough of Juneau.