Sediment Retention Structure at Mount St. Helens
The sediment retention structure on the North Fork of the Toutle River was completed 1989 by the U.S. Army Corps of Engineers to retain some of the sediment in the Toutle River flowing down from the slopes of Mt. St. Helens. The dam is approximately 22 miles upriver from Castle Rock, Washington.

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Photo by: Bill Johnson |  VIRIN: 900101-A-ZZ999-0001.JPG