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Storing Sediment and Freeing Fish

by Bruce McCracker, U.S. Army Corps of Engineers, Portland District, Portland, OR 97208,


Serial Information: Civil Engineering—ASCE, 1989, Vol. 59, Issue 9, Pg. 58-60


Document Type: Feature article

Abstract:

When Mount St. Helens erupted in May 1980, it sent a river of pyroclastic ash and other debris into Washington's North Fork Toutle River Valley. The resulting debris pile has been choking the river system since then, necessitating a rehab that includes construction of a sediment retention structure that will trap and store sediment eroding from the debris pile. The project has also included a temporary diversion of the North Fork Toutle River, as well as the construction of a fish collection facility that will enable salmon and steelhead to continue their migration up- and downstream.

Subject Headings: Sediment | Rivers and streams | Debris | Steel construction | Piles | Fish and fishery management | Retaining structures

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