Volcanic Sediment
The eruption of Mount St. Helens and subsequent lahars poured vast amounts of sediment into the Toutle. The United States Army Corps of Engineers dredged sediment from the river and built the $65 million Sediment Retention Structure on the North Fork Toutle River to prevent debris from continuing downstream. Part of the same engineering works is a tunnel to drain Spirit Lake, on the north side of the volcano, after the eruption blocked the lake's natural outlet.
Read more about this topic: Toutle River
Famous quotes containing the word volcanic:
“Each of us, even the lowliest and most insignificant among us, was uprooted from his innermost existence by the almost constant volcanic upheavals visited upon our European soil and, as one of countless human beings, I can’t claim any special place for myself except that, as an Austrian, a Jew, writer, humanist and pacifist, I have always been precisely in those places where the effects of the thrusts were most violent.”
—Stefan Zweig (18811942)