answers: an active stratovolcano
context: later by National Guard helicopter pilots. Their film, "The Eruption of Mount St. Helens", later became a popular documentary. In 1982, President Ronald Reagan and the U.S. Congress established the Mount St. Helens National Volcanic Monument, a area around the mountain and within the Gifford Pinchot National Forest. Following the 1980 eruption, the area was left to gradually return to its natural state. In 1987, the U.S. Forest Service reopened the mountain to climbing. It remained open until 2004 when renewed activity caused the closure of the area around the mountain (see "Geological history" section above for more details). Most </s> river systems: the Toutle River on the north and northwest, the Kalama River on the west, and the Lewis River on the south and east. The streams are fed by abundant rain and snow. The average annual rainfall is , and the snow pack on the mountain's upper slopes can reach . The Lewis River is impounded by three dams for hydroelectric power generation. The southern and eastern sides of the volcano drain into an upstream impoundment, the Swift Reservoir, which is directly south of the volcano's peak. Although Mount St. Helens is in Skamania County, Washington, access routes to </s> Mount St. Helens 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 northeast of Portland, Oregon and south of Seattle, Washington. 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
question: why type of volcano is mount saint helens