Lahars resulting from the May 18, 1980 eruption of Mount St. Helens...
![Lahars resulting from the May 18, 1980 eruption of Mount St. Helens...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/vhp_img529.jpg?itok=H8ZreWMq)
Detailed Description
Nearly 135 miles (220 kilometers) of river channels surrounding the volcano were affected by the lahars of May 18, 1980. A mudline left behind on trees shows depths reached by the mud.
Sources/Usage
Public Domain.