Mount Rainier's Lahar Risk Poses Threat to 60,000 Residents in Washington
Mount Rainier, a 14,000-foot (4,267-meter) volcano in Washington, is considered the most dangerous in the U.S. due to its potential to trigger devastating lahars. These fast-moving mudflows, composed of rocky debris, mud, and meltwater, can travel over 100 mph and reach distances of 50 miles. The volcano’s 25 glaciers hold five times more snow and ice than all other Cascade volcanoes combined, making it highly susceptible to lahars triggered by minor thaws, heavy rainfall, or dam failures. While there is no immediate eruption threat, the risk of a 'no-notice' lahar remains significant, particularly for Pierce County, which lies in the forecast path.