no longer operates as a dam, but its solid concrete sweep is designed to stop the advance of mud and debris and allow only water to pass through culverts to open areas where the water percolates ...

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

He explained the Sierra Madre Dam is somewhat of an undersized dam in that area that they have been hauling debris from around the clock for the past several weeks. "We do expect that facility ...