landslide stuff, mud into that river. to get the columbia river back open again to get the other smaller rivers that were just inundated and buried under all of this ash and sand and mud, the army corps of engineers started dredging that stuff out almost immediately. that dredging process went on for years after mt. st. helen s erupted in 19 0. the seattle times looks back today and says that the amount of stuff that they dredged out of the rivers after mt. empty st. helen s erupted was enough material to build a 12-lane highway from new york city to san francisco. 12 lanes. they dredged all that stuff to keep the rivers going. and they piled it up on banks next to the rivers. in the little town of castle rock washington the dredge piles were dozens and dozens of acres. it basically created this moon scape of this dredged up ash and
Detailed text transcripts for TV channel - CNN - 20100217:01:01:00
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Detailed text transcripts for TV channel - CNN - 20100217:06:55:15
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