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Mount St. Helens Eruption, Corps of Engineers Restoration Efforts,
ARMY ENGINEER DISTRICT PORTLAND OREG
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On 18 May 1980, Mount St. Helens in Washington State experienced a large magnitude volcanic eruption, which severely impacted the surrounding area and the channels of major streams having their sources near the mountain. One of the more significant impacts was the filling in of the flood control and navigation channels of the Cowlitz and Columbia Rivers. Immediately thereafter, the Corps of Engineers undertook a massive program to restore both navigation and flood carrying capacity of these streams. This paper summarizes primarily the dredging efforts and briefly addresses the Corps of Engineers activities as well.
APPROVED FOR PUBLIC RELEASE