The eruption of Mount St. Helens and subsequent lahars poured vast amounts of sediment into the Toutle . The United States Army Corps of Engineers dredged sediment from the river and built the $ 65 million Toutle River Sediment Retention Structure on the North Fork Toutle River to prevent debris from continuing downstream
eruption of Mount St. Helens
1980 eruption of Mount St. Helens
Toutle River