When did mt st helen's last erupt?
After a relatively quiet 2007, on January 16, 2008, USGS geologist John S. Pallister spotted steam seeping from the lava dome in Mount St. Helens' crater. At approximately the same time, the Pacific Northwest Seismograph Network recorded a magnitude 2.9 earthquake, followed by a small tremor that lasted for nearly ninety minutes, and a magnitude 2.7 earthquake. But by the end of January, the lava dome growth had stopped. On July 10, 2008, it was determined that the eruption that began in 2004 had ended, after 6 months of inactivity.
When did mt st helen's last eruption end?
July 10, 2008
2004–08 volcanic activity of Mount St. Helens
On January 16, 2008, steam began seeping from a fracture on top of the lava dome. Associated seismic activity was the most noteworthy since 2004. Scientists suspended activities in the crater and the mountain flanks, but the risk of a major eruption was deemed low. By the end of January, the eruption paused; no more lava was being extruded from the lava dome. On July 10, 2008, it was determined that the eruption had ended, after more than six months of no volcanic activity.
When did mt st helen's last eruption begin?
January 16, 2008
Mount St. Helens
Mount St. Helens is most notorious for its major eruption on May 18, 1980, the deadliest and most economically destructive volcanic event in U.S. history. Fifty-seven people were killed; 250 homes, 47 bridges, of railways, and of highway were destroyed. A massive debris avalanche, triggered by an earthquake of magnitude 5.1, caused a lateral eruption that reduced the elevation of the mountain's summit from to , leaving a wide horseshoe-shaped crater. The debris avalanche was up to in volume. The Mount St. Helens National Volcanic Monument was created to preserve the volcano and allow for the eruption's aftermath to be scientifically studied.
When did mt st helen's last major eruption occur?
May 18, 1980
Mount St. Helens
2004–08 volcanic activity of Mount St. Helens
https://en.wikipedia.org/wiki/2004%E2%80%9308%20volcanic%20activity%20of%20Mount%20St.%20Helens
Mount St. Helens
https://en.wikipedia.org/wiki/Mount%20St.%20Helens
Mount St. Helens (known as Lawetlat'la to the Indigenous Cowlitz people, and Loowit or Louwala-Clough to the Klickitat) is an active stratovolcano located in Skamania County, Washington[1] in the Pacific Northwest region of the United States. 
Mount St. Helens
On January 16, 2008, steam began seeping from a fracture on top of the lava dome. Associated seismic activity was the most noteworthy since 2004. Scientists suspended activities in the crater and the mountain flanks, but the risk of a major eruption was deemed low.[42] By the end of January, the eruption paused; no more lava was being extruded from the lava dome. On July 10, 2008, it was determined that the eruption had ended, after more than six months of no volcanic activity
Mount St. Helens
On March 20, 1980, Mount St. Helens experienced a magnitude 4.2 earthquake;[4] and, on March 27, steam venting started.[31] By the end of April, the north side of the mountain had started to bulge.[32] On May 18, a second earthquake, of magnitude 5.1, triggered a massive collapse of the north face of the mountain. 
Mount St. Helens is an active stratovolcano located in Skamania County, Washington, which had its last major eruption on May 18, 1980 with a magnitude of 5.1 that triggered a massive collapse of the north face of the mountain. The most recent eruption of Mt. St. Helens began on January 16, 2008, when steam began seeping from a fracture on top of the lava dome and associated seismic activity was the most noteworthy since 2004. Scientists suspended activities in the crater and the mountain flanks, but the risk of a major eruption was deemed low and by the end of January, the eruption paused; no more lava was being extruded from the lava dome. On July 10, 2008, it was determined that the eruption had ended, after more than six months of no volcanic activity.