File:Mudline from 1980 St Helens lahars next to Muddy River.jpg
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| Description | Mount St. Helens Mudline. Nearly 135 miles (220 kilometers) of river channels surrounding the volcano were affected by the lahars of May 18. A mudline left behind on trees shows depths reached by the mud. A scientist (middle right) gives scale. This view is along the Muddy River, southeast of Mount St. Helens. (October 23,1980, by Lyn Topinka, USGS/CVO) |
| Date | 23 October 1980 |
| Source | USGS image from |
| Author | Lyn Topinka, USGS/CVO |
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