(Vancouver, WA)  --  The eruption that blew 13-hundred feet off the top of Mount St. Helens happened 40 years ago today.  The eruption sent super-heated pyroclastic flows down the flanks of the mountain and killed 57 people.  Flooding destroyed bridges, roads, a railroad line, logging camps and houses.  The ash plume covered eastern Washington with several inches of ash.  Seismologists say there are no signs of an imminent eruption in the near future, but it is likely to erupt again.