Skip to main content
U.S. flag

An official website of the United States government

Plume of steam, gas, and ash viewed from Harry's Ridge (8 km/5 mi n...

Detailed Description

Plumes of steam, gas, and ash often occured at Mount St. Helens in the early 1980s. On clear days they could be seen from Portland, Oregon, 50 miles (81 kilometers) to the south.