LONGVIEW, Wash. (AP) — The U.S. Army Corps of Engineers is trying something different next month to control massive sediment flow from Mount St. Helens.
The corps will be testing two types of structures in the north fork of the Toutle River to help slow the flow of millions of cubic yards of debris downstream.
One structure is a series of pile dikes stretching 800 feet across the valley. The other consists of 18 semicircular structures that work like logjams to divert silt.
The Daily News of Longview reports the storage area behind the 125-foot sediment retaining dam on the river is no longer trapping silt efficiently.
