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Mount St. Helens - Wikipedia, the free encyclopedia

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USGS Mount St. Helens

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map #26 USGS Mount St. Helens
Type #21 Active stratovolcano
Volcanic   arc / belt Cascade Volcanic Arc
Age of rock < #20 40,000 yrs
Last eruption #19 2004–2008 (ongoing)
First ascent #18 1853 by Thomas J. Dryer
Easiest route #17 Hike via south slope of volcano (closest area near eruption site)

#1 Mount St. Helens is an active stratovolcano located in Skamania County , Washington , in the Pacific Northwest region of the United States . #2 It is 96 miles (154   km) south of Seattle and 53 miles (85   km) northeast of Portland, Oregon . #12 Mount St. Helens takes its English name from the British diplomat Lord St Helens , a friend of explorer George Vancouver who made a survey of the area in the late 18th century. #3 The mountain is located in the Cascade Range and is part of the Cascade Volcanic Arc , a segment of the Pacific Ring of Fire that includes over 160 active volcanoes . #10 This volcano is well known for its ash explosions and pyroclastic flows .

#4 Mount St. Helens is most famous for its

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field,

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