Alaska Declares Disaster as Suicide Basin Overtops, Posing Flood Risks to Juneau
- On August 3, 2025, HESCO flood barriers were erected along the Mendenhall River to protect nearby homes from potential flooding caused by a glacial outburst.
- This event comes after two years in which the Mendenhall Glacier functioned as an ice dam, periodically releasing enormous volumes of water that flooded areas further along the river.
- Authorities issued evacuation alerts for residents in the 17-foot inundation zone and coordinated the installation of about 10,000 four-foot barriers and a temporary levee to guard over 460 properties.
- Officials warned that the outburst could discharge as much as 15 billion gallons of water—comparable to nearly 23,000 Olympic-sized swimming pools—and that flooding this year may approach near-record levels, with the crest expected around midweek.
- The disaster declaration and preparedness measures aim to reduce impacts and preserve safety during what may be another historic GLOF, which may continue as long as the glacier seals the basin over the next 25 to 60 years.
138 Articles
138 Articles
Disaster declared in Alaska’s capital due to ‘catastrophic flooding’ threat from glacial lake outburst
Alaska Gov. Mike Dunleavy issued a disaster declaration Sunday in response to an "imminent threat of catastrophic flooding" from a glacial lake outburst flood (GLOF) linked to a side basin of the Mendenhall Glacier.
Parts of Juneau brace for flooding from water slipping past Alaska's Mendenhall Glacier
Sections of Alaska’s capital city are bracing for the arrival of what could be record floodwaters due to rainwater and snowmelt flowing downstream from a basin dammed by the Mendenhall Glacier. Some Juneau residents in the flood zone have evacuated, heeding warnings. On Tuesday morning, authorities confirmed water had started escaping the ice dam, with flooding expected into Wednesday. The Mendenhall Glacier is about 12 miles (19 kilometers) fro…
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