Qualla: Mount St. Helens: The Mountain That Blew Its Top

Mount St. Helens: The Mountain That Blew Its Top: Introduction

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit Harry Glicken, Public domain. The mountain gave warning. For two months before May 18, 1980, earthquakes shook Mount St. Helens, steam vented from its crater, and a bulge grew on the north face at five feet per day. Scientists monitored; authorities restricted access; Harry Truman refused to leave his lodge. At 8:32 AM on that Sunday morning, an earthquake triggered the collapse of the bulge, releasing pressure that blasted sideways with the force of 500 Hiroshima bombs. The lateral blast, moving at 300 mph, devastated 230 square miles in seconds. Fifty-seven people died, including volcanologist David Johnston, whose last radio transmission was 'Vancouver! Vancouver! This is it!' The mountain that had been 9,677 feet tall was now 8,363 feet, its summit replaced by a horseshoe crater.

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Image: Harry Glicken | Public domain

Mount St. Helens: The Mountain That Blew Its Top: The Warning

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit U.S. Forest Service- Pacific Northwest Region, Public domain. Mount St. Helens had been dormant since 1857, but scientists knew the Cascades contained active volcanoes. Earthquakes began in mid-March 1980, increasing in frequency and magnitude. Steam explosions opened a crater at the summit. Most ominously, the north face began to bulge out...

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Image: U.S. Forest Service- Pacific Northwest Region | Public domain

Mount St. Helens: The Mountain That Blew Its Top: The Blast

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit Walter Siegmund (talk), CC BY-SA 3.0. At 8:32:17 AM on May 18, 1980, a magnitude 5.1 earthquake triggered the collapse of the north face. The largest landslide in recorded history - 0.7 cubic miles of rock - roared down the mountain. The sudden decompression released superheated gas and rock in a lateral blast that o...

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Image: Walter Siegmund (talk) | CC BY-SA 3.0

Mount St. Helens: The Mountain That Blew Its Top: The Aftermath

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit U.S. Forest Service- Pacific Northwest Region, Public domain. Fifty-seven people died. The economic damage reached $1 billion (1980 dollars). Ash fall disrupted transportation and business across Washington, Oregon, and Idaho. The Toutle River choked with debris, threatening downstream communities. The mountain's profile was transformed - t...

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Image: U.S. Forest Service- Pacific Northwest Region | Public domain

Mount St. Helens: The Mountain That Blew Its Top: The Return

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit Steve Schilling, USGS, Public domain. Life returned faster than expected. Within weeks, plants sprouted through ash. Pocket gophers, surviving underground, churned buried soil to the surface. Elk migrated into the blast zone within months. Scientists established monitoring plots and watched ecosystems rebuild. The pr...

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Image: Steve Schilling, USGS | Public domain

Mount St. Helens: The Mountain That Blew Its Top: Visiting Mount St. Helens

Mon, 12 Jan 2026 00:00:00 GMT

Photo credit Jim Nieland, Public domain. Mount St. Helens National Volcanic Monument is located in southwestern Washington, approximately 50 miles northeast of Portland via Interstate 5 and Highway 504. The Johnston Ridge Observatory, at the end of Highway 504, offers crater views and interpretive exhibits. The observat...

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Image: Jim Nieland | Public domain