What Causes Flooding in Juneau
Two distinct drivers cause flooding here. The first is heavy regional rainfall — 62 to 90-plus inches a year, worst from August through October — which causes general urban and creek flooding. The second is the Mendenhall Glacier’s Suicide Basin, which has produced annual glacial lake outburst floods since 2011, a pattern that has damaged hundreds of Mendenhall Valley homes, with the Mendenhall River rising to a record 16.65-foot flood stage in 2025.
What a Glacial Lake Outburst Flood Is
A glacial lake outburst flood is a sudden release of water dammed by glacial ice — specific to the Mendenhall Glacier’s Suicide Basin in Juneau’s case. The City and Borough of Juneau and partner agencies monitor conditions and issue alerts ahead of these releases, but professional cleanup after the water recedes is a separate, necessary step that public agencies don’t handle.
Our Flood Cleanup Process
The sequence: safety assessment, water extraction, removal of contaminated materials (floodwater is often gray or black water category), structural drying and dehumidification, sanitizing, moisture verification, and documentation for insurance.
Mendenhall Valley and Beyond
Mendenhall Valley carries the highest exposure given its proximity to the Mendenhall River and Mendenhall Glacier and Lake. Auke Bay and Lemon Creek see additional flooding from heavy rainfall runoff. Downtown Juneau, Douglas, Twin Lakes, and West Juneau are also served for general storm and rain-driven flooding beyond the glacial flood risk specific to Mendenhall Valley.
Insurance and FEMA Assistance
Flood damage coverage depends on your policy type — standard homeowners policies often exclude flood damage, which may require separate flood insurance. FEMA or state disaster assistance may be available after a declared disaster; confirm directly with FEMA or state resources for your specific situation. We document damage thoroughly to support your claim but don’t provide legal or insurance advice.