Today, fascinating trails explore the dramatic effects of this epic geologic event. These include the Hummocks and South Coldwater trails on the north side of the Mount St. Helens National Volcanic Monument, and the Ape Canyon Trail on the east side. You also can experience previous eruptions by taking the Trail of Two Forests on the mountain's south side and the Lava Canyon Trail on the southeast side.
Today, fascinating trails explore the dramatic effects of this epic geologic event. These include the Hummocks and South Coldwater trails on the north side of the Mount St. Helens National Volcanic Monument, and the Ape Canyon Trail on the east side. You also can experience previous eruptions by taking the Trail of Two Forests on the mountain's south side and the Lava Canyon Trail on the southeast side.
Even more remarkable is that the scour marks are on the opposite side of Johnston Ridge from the mountain. The debris avalanche was so powerful it was able to shove its way more than 1,200 feet up and over the ridge at one point (you can see where that happened when you reach the visitor center).
"The avalanche was going over 100 mph and it had a lot of energy behind it," Frenzen said. "This is one of the very few places on Earth were a mountain has gone over another mountain."
http://seattlepi.nwsource.com/getaways/73385_sthelenshikes06.shtml
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