Decades after Mount St. Helens' eruption sent almost 90 billion cubic feet of debris into the upper Toutle Valley, sediment ...

San Miguel Corp. (SMC), through its Better Rivers PH initiative, has removed nearly 88,000 tons of silt and solid waste from ...

The sediment retention dam in Toutle has become less and less effective as it fills, switching from catching about 80% of passing sediment to allowing 80% to pass, according to ...

The last Cache River clean out was in 2013, since then, there has been a large amount of logs, silt and other debris on the river.

So to find out how much sediment had moved, they inspected the river using a detector (similar to a metal detector): "When the device detects a code, it informs us which stone it is and gives us ...

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.