Mount St. Helens
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Mount St. Helens 

Mount St. Helens in Washington is the most active volcano in the Cascade Range. Before renewed activity in the fall of 2004, its most recent series of eruptions had begun in 1980 when a large landslide and powerful explosive eruption created a large crater, and ended 6 years later after more than a dozen extrusions of lava built a dome in the crater. Larger, longer-lasting eruptions have occurred in the volcano's past and are likely to occur in the future. Scientists with the U.S. Geological Survey and University of Washington continue to closely monitor Mount St. Helens for signs of renewed activity. [Modified from U.S. Geological Survey Fact Sheet 036-00, Online Version 1.0

  • Take the Mount St. Helens 30th Anniversary Quiz.
  • See the slide shows on the 1980 eruption: Slide Set 1 (March–June 1980) and Slide Set 2 (May 18, 1980–May 13, 1981).
  • Watch the mountain through the U.S. Forest Service Mount St. Helens VolcanoCam, located at Johnston Ridge Observatory about 5 miles from the volcano. Images are updated about every 5 minutes.

An ash and gas emission from the Lava Dome at Mount St. Helens, April 16, 1983.


Roadside geology of Mount St. Helens National Volcanic Monument and vicinity
[PDF, 56.7 MB; PDF of Part 1, 28.0 MB;  PDF of Part 2, 28.6 MB]

Cascades volcanoes—Processes and hazards: A five day field trip, Mount Baker to Mount St. Helens [PDF, 10.3 MB]

Mount St. Helens ash—Properties and possible uses [PDF, 14 MB]

Postglacial influence of volcanism on the landscape and environmental history of the Puget Lowland, Washington
[PDF, 591 KB]

The 1980 eruption of Mount St. Helens, Washington [PDF, 1.0 MB]

Ash from the May 18, 1980, eruption of Mount St. Helens—maps showing bulk density, depth of uncompacted ash
[2 sheets], time of first ashfall, kilograms of ash per square meter, and depth of rain-compacted ash
[PDF, 19.1 MB]

Targeting geothermal exploration sites in the Mount St. Helens area using soil mercury survey [PDF, 8.3 MB]

Mount St. Helens—A bibliography of geoscience literature, 1882–1986 [author index, PDF, 26.4 MB;
subject index, PDF, 23.6 MB]

A pre-1980 eruption description of Mount St. Helens [PDF, 1.7 MB]

Newsletter Articles

Observations of glacial, geomorphic, biologic, and mineralogic developments in the crater of Mount St. Helens, Washington [PDF, 5.0 MB]

Field sketches of late-1840s eruptions of Mount St. Helens, Washington [PDF, 9.3 MB]

Mount St. Helens Anniversary Issue: Washington Geologic Newsletter [PDF, 9.5 MB]

Geologic guide to the Monitor Ridge climbing route, Mount St. Helens, Washington [PDF, 5.7 MB] 

MOUNT ST. HELENS ERUPTION ISSUE: Washington Geologic Newsletter [PDF, 7.2 MB]

There are many other articles.  To see them, go to the Online Catalog and search on Mount St. Helens.



Mount St. Helens Anaglyph

Mount St. Helens Anaglyph
Click below for full-size anaglyph:
175 dpi [305 Kb]
96 dpi [120 Kb]

This anaglyph, which can be seen in 3-D using red/green or red/blue glasses, was created by Terry Curtis, DNR's Photogrammetry Supervisor (360-902-1210) and prepared for the Internet by Pat Pringle. Please note that the red lens should be over the left eye.

The view is looking down into the crater with north to the right.

To compare the anaglyph to a topographic map of Mount St. Helens, visit TopoZone.

Sources of anaglyph glasses:
3-D Glasses Vendors, a list maintained by Jet Propulsion Laboratory

Metadata on original photos used:
DNR Project SW-H-96
Flown July 8, 1996, Lear Jet, at a height of 43,560 feet (~8 miles) above average ground elevation
Camera focal length: 8.25 inches nominal (214.034 mm calibrated)
Anaglyph created using Adobe Photoshop

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Geologic Hazards Group
Geology & Earth Resources Division
Washington State Department of Natural Resources
Fax 360-902-1785

Dave Norman
State Geologist and Oil & Gas Supervisor