Located near Castle Rock, Mount St. Helens was the site of a staggering volcanic eruption in 1980. The explosive eruption blew 1,312 ft/400 m off the top of Mount St. Helens. Rock, snow and ice produced an avalanche traveling down the mountain at 200 mph/322 kph. The avalanche poured into Spirit Lake, sending out water and flooding the lower areas around the lake. Other blasts wiped out nearly everything within 16 mi/27 km. Up to 3 in/8 cm of ash buildup blanketed areas up to 150 mi/241 km away ... Subscribe to travel42 to read the full Destination Guide.
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