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Main Menu > Mount Rainier National Park > Also Nearby Mount St. Helens National Volcanic Monument Amboy, Washington This Excursion Comes From ... National Geographic's Guide to the Lewis and Clark Trail For more National Geographic travel guides—from Europe to Antarctica and everywhere in between—visit National Geographic Books >> This monument owes its existence to the day in May 1980 when Mount St. Helens erupted, laying waste to the surrounding forest. Visitors witness the rebirth of a forest through interpretive programs and tours. 110,000 acres [44,515.4 hectares]. Facilities: hiking, bicycling, climbing (reservations required), fishing, hunting, picnic areas, scenic drives, winter sports, handicapped access. Open year-round, but winter snows close many roads. Within Gifford Pinchot NF. Four visitor centers east of Castle Rock on Washington Hwy. 504. Many viewpoints and trails accessed from the north via Washington Hwy. 12 at Randle and from the south via Washington Hwy. 503 at Woodland. +1 360 274 2100. More Recommendations for Mount Rainier National Park