45 years after blast, Mount St. Helens sediment still causes problems
Decades after Mount St. Helens' eruption sent almost 90 billion cubic feet of debris into the upper Toutle Valley, sediment ...
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45 years after blast, Mount St. Helens’ sediment still causing costly problems
Nearly 45 years after Mount St. Helens’ eruption sent almost 90 billion cubic feet of debris into the upper Toutle Valley, millions of tons of sediment still pour into the Cowlitz River each year.