A glacial lake outburst from the Mendenhall Glacier has resulted in unprecedented flooding in Juneau, causing river levels to rise to record highs. The Mendenhall River peaked at over 16.6 feet, prompting evacuation warnings for residents as the city prepared for the worst. Flood barriers successfully contained the surge, preventing a disaster despite the overwhelming floodwaters. The situation remains critical, with officials urging some residents to evacuate while others hunker down. Water levels are now receding, but the incident highlights the growing risks associated with glacial melts as climate changes continue to escalate.