Alaska Governor Mike Dunleavy has declared a state disaster for Juneau as a glacially-dammed lake threatens to unleash catastrophic flooding that could surpass last year’s record devastation.
Story Highlights
- State disaster declaration activates emergency operations for an imminent glacial lake outburst flood from Suicide Basin.
- Catastrophic flooding could equal or exceed the 2024 record event, which damaged hundreds of homes.
- The National Weather Service warns the basin has reached full capacity with release possible at any moment.
- A proactive coordinated response includes state, local, and tribal emergency declarations.
Governor Issues Preemptive Disaster Declaration
Governor Mike Dunleavy issued a state disaster declaration for Juneau due to the imminent threat of a glacial lake outburst flood from Suicide Basin near Mendenhall Glacier.
The Alaska Division of Homeland Security & Emergency Management activated the State Emergency Operations Center to coordinate interagency actions, emergency permitting, and public messaging.
This declaration followed preemptive local disaster declarations issued by the City and Borough of Juneau and the Central Council of Tlingit & Haida on August 8.
Suicide Basin Reaches Critical Capacity
The National Weather Service projected that Suicide Basin would reach full capacity by August 11, 2025, with a release possible at any time. The basin’s current water volume equals or exceeds levels from previous years that produced record-breaking floods.
Suicide Basin, a glacially-dammed lake adjacent to Mendenhall Glacier, has produced annual outburst floods since 2011 as changing glacier dynamics periodically release impounded water into Mendenhall Lake and River.
Record-Breaking Flood History Raises Stakes
The August 2024 flood damaged hundreds of homes in Juneau’s Mendenhall Valley, establishing a devastating precedent for the current threat. Record-breaking outburst floods also occurred in August 2023, highlighting an escalating pattern of severe glacial lake releases.
The Mendenhall Valley contains dense residential areas and critical infrastructure along the Mendenhall River, where rapid water rises from glacial outburst floods pose significant risks to property and public safety.
Emergency Response Coordination Mobilized
State emergency operations focus on coordinating protective actions, streamlining emergency permitting, and maintaining public communication as the flood threat develops.
Local and tribal authorities implemented frontline preparedness measures, while the National Weather Service provides ongoing basin monitoring and flood forecasting.
Residents received guidance to monitor Ready Alaska preparedness resources and Juneau flood help portals for real-time updates and protective action recommendations during this critical period.
Sources:
Governor issues preemptive disaster declaration for Juneau as Suicide Basin nears capacity
Governor Dunleavy Issues Disaster Declaration in Response to Imminent Glacial Flood Threat in Juneau
Alaska’s Juneau faces imminent threat of ‘catastrophic flooding’ from glacier lake outburst
Preemptive disaster declaration for Juneau as Suicide Basin overtops, Mendenhall Glacier, Alaska
Glacial lake outburst could produce ‘catastrophic flooding’ in Alaska’s capital
