15 Jan 2026

USACE awards $35.9M contract for Mount St. Helens sediment dam improvement

In an effort to manage flood risk for downstream communities, the U.S. Army Corps of Engineers will raise the dam that captures some of the sediment that continues to flow from Mount St. Helen after its 1980 eruption. USACE awarded a $35.9 million contract to Anvil Builders, Inc., to raise the 184-foot-tall Mount St. Helens Sediment Retention Structure (SRS) by 10 feet.

8 Aug 2018

Final supplemental environmental impact statement for sediment management at Mount St. Helens available for review

The U.S. Army Corps of Engineers has completed the final supplemental environmental impact statement (EIS) for its long-term sediment management plan for Mount St. Helens. It is available for review and comment until Sept 10.

25 Sep 2017

Plan for future of flood fight at Mount St. Helens open for comment

The Corps is seeking public comments on proposed updates to its decades-old long-term sediment management plan for Mount St. Helens. It has been fighting erosion at the volcano since 1980, when a catastrophic eruption dropped more than three billion cubic yards of sediment into the Toutle River, threatening neighboring communities.