Mount St. Helens Episode 3: The Sediment Retention Structure

After the eruption of Mount St. Helens, sediment charged down the Toutle, Cowlitz and Columbia rivers, posing the risk of flooding to thousands of people living downstream.
Join Tessa Rough, one of our park rangers at Bonneville Lock & Dam, to learn more about the long-term solution we engineered to help protect our communities.
This video is the third in a four-part series about the Mount St. Helens eruption on May 18, 1980, and our response efforts.