camping, biking, pets, fires, and off-trail excursions are all prohibited. On April 14, 2008, John Slemp, a snowmobiler from Damascus, Oregon, fell 1,500 feet into the crater after a snow cornice gave way beneath him on a trip to the volcano with his son. Despite his long fall, Slemp survived with minor injuries, and was able to walk after coming to a stop at the foot of the crater wall, where he was rescued by a mountain rescue helicopter. A visitor center run by the Washington State Parks is in Silver Lake, Washington, about west of Mount St. Helens. Exhibits include a large model of the volcano, a seismograph, a theater program, and an outdoor natural trail. See also List of volcanic eruptions by death toll References Notes Bibliography Further reading External links University of Washington Libraries: Digital Collections: The Royal Geography Society's Hidden Journeys project: (duration 6:29 min) St. Helens, Mount Saint Helens, Mount Gifford Pinchot National Forest Saint Helens, Mount Saint Helens, Mount Locations in Native American mythology Religious places of the indigenous peoples of North America 19th-century volcanic events 20th-century volcanic events 21st-century volcanic events National Register of Historic Places in Skamania County, Washington Natural features on the National Register of Historic Places in Washington (state) Saint Helens, Mount Saint Helens, Mount Saint Helens, Mount Articles containing video clips National Register of Historic Places in Cowlitz County, Washington Saint Helens, Mount