Mount St. Helens erupted in southwestern Washington May 18, 1980. The Corps of Engineers constructed an outlet tunnel to allow Spirit Lake to again flow into the Toutle River after the eruption (Corps of Engineers photo) [When mountains move, humans can only watch and figure out how to work with the changes.]

Mount St. Helens erupted in southwestern Washington May 18, 1980. The Corps of Engineers constructed an outlet tunnel to allow Spirit Lake to again flow into the Toutle River after the eruption (Corps of Engineers photo)

Mount St. Helens erupted in southwestern Washington May 18, 1980. The Corps of Engineers constructed an outlet tunnel to allow Spirit Lake to again flow into the Toutle River after the eruption (Corps of Engineers photo)