Castle Rock in Cowlitz County, Washington — The American West (Northwest)
Mount St. Helens - You Are Edge of the Blast Zone
The eruption of Mount St. Helens on May 18, 1980 triggered a huge landslide causing a powerful, laterally directed blast. A pyroclastic flow consisting of rock fragments, highly charged gas and super heated steam, devastated almost 150,000 acres of private, state and federal forests.
In 1982 Congress established the 110,000 acre Mount St. Helens National Volcanic Monument. Inside the monument no salvage and no tree planting were permitted.
Erected by Wyerhaeuser.
Location. 46° 19.776′ N, 122° 26.239′ W. Marker is in Castle Rock, Washington, in Cowlitz County. Marker is on Spirit Lake Highway (Washington Route 504), on the right when traveling east. Click for map. This road is open seasonally so check ahead. Marker is in this post office area: Castle Rock WA 98611, United States of America.
Categories. • Disasters • Environment • Horticulture & Forestry •
Credits. This page originally submitted on , by Lora Mueller of Silver Spring, Maryland. This page has been viewed 662 times since then and 81 times this year. Photos: 1, 2, 3, 4. submitted on , by Lora Mueller of Silver Spring, Maryland. • Syd Whittle was the editor who published this page. This page was last revised on June 16, 2016.
Editor’s want-list for this marker. Wide area view of the marker and its surroundings. • Photos of the area showing effects of the eruption and forest restoration. • Can you help?