Skip to main content
U.S. flag

An official website of the United States government

North Fork Toutle River, Sediment Retention Struct., Mount St. Helens

Detailed Description

The May 18, 1980 eruption of Mount St. Helens had a dramatic impact on the North Fork Toutle River. The debris avalanche, lateral blast and ashfall produced a substantial amount of sediment, which continues to be washed into the river and transported downstream. A Sediment Retention Structure was constructed (out of view) to minimize the amount of sediment flowing downstream. View is to the east with Mount St. Helens in the background.


Public Domain.