ash, mud, sand, the army corps of engineers starred dredging that immediately after the eruption and that process went on for years after mount st. helen s erupted in 1980. the seattle times books back today saying the amount of stuff they dredged out of the rivers was enough material to build a 12-lane highway from new york city to san francisco.3รง 12 lanes. they dredged all of that stuff to keep the rivers going. and they piled it up on the banks. next to the rivers. and the little up to of causal rock, washington, the dredge piles where dozens and dozen of acres basically created this moonscape of this dredged-up ash and sand and sediment that nobody knew what to do with but they had to do the dredging to try to save the down. above castle rock is a lake called spirit lake and spirit lake took the brunt of this
river. p t put sediment and mudslide into the river. to get the columbia river open again. and smaller rivers buried under ash, mud, sand, the army corpse of engineers starred dredging that immediately after the eruption and that process went on for years after mount st. helen s erupted in 1980. the seattletimes books back today saying the amount of stuff they dredged out of the rivers was enough material to build a 12-lane highway from new york city to san francisco. next to the rivers. and the little up to of causal rock, washington, the dredge piles where dozens and dozen of acres basically created this moon skaip of this dredged-up ash and sand and sediment that nobody knew what to do with but