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Mount Saint Helens

Active Stratovolcano Cratered by Its Massive 1980 Eruption

Stratovolcano in Mt. St. Helens National Volcanic Monument, Gifford Pinchot NF, Cascade Range, Mount St. Helens Crater Area near Cougar Park, WA

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Mount St. Helens or Louwala-Clough (known as Lawetlat'la to the indigenous Cowlitz people, and Loowit to the Klickitat) is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles (154 km) south of Seattle, Washington, and 50 miles (80 km) northeast of Portland, Oregon. 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. The volcano 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. This volcano is well known for its ash explosions and pyroclastic flows. Mount St. Helens is most notorious for…

Classified As

Stratovolcano

Geologic Formation

Pleistocene-Recent volcanic rocks (WAQv;0)

Geologic Formation