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Mount St. Helens Crater Glacier...

Mount St. Helens Crater Glacier

Map of Mount St. Helens Crater Glacier created from LiDAR data acquired September 2009.

Topographic map, Mount St. Helens, C.E. 1919 annotated with locatio...

Topographic map, Mount St. Helens, C.E. 1919 annotated with locatio...

Due to the cataclysmic eruption of May 18, 1980, many of the locations annotated on this map are now either covered or no longer visible.

Mount St. Helens prior to the catastrophic eruption of May 18, 1980...

Mount St. Helens prior to catastrophic eruption of May 18, 1980. St...

Mount St. Helens prior to the catastrophic eruption of May 18, 1980. Streams and lava flows also visible. View is looking southerly from oblique aerial view. Mount Hood in distance.

Mount St. Helens before the May 18, 1980 eruption. View from the no...

Mount St. Helens before May 18, 1980 eruption

Before the devastating May 18, 1980 eruption, Mount St. Helens was considered to be one of the most beautiful and most frequently-climbed peaks in the Cascade Range. Spirit Lake was a vacation area offering hiking, camping, boating, and fishing.

Testing bathymetric equipment at Coldwater Lake, Mount St. Helens...

Testing bathymetric equipment at Coldwater Lake, Mount St. Helens

Adam Mosbrucker tests equipment (Acoustic Doppler Current Profiler, survey-grade RTK-GPS and a map-grade GPS) in preparation for a lake bottom survey.

Dome building episode from 2004-2008 at Mount St. Helens can be obs...

Dome building episode from 2004-2008 at Mount St. Helens can be obs...

Dome building episode from 2004-2008 at Mount St. Helens can be observed and measured with these two digital elevation models (DEMs) developed before and after the eruptive episode.

Researchers generate a bathymetric contour map of Castle Lake, near...

A bathymetric contour map of Castle Lake, Mount St. Helens.

Researchers map the bottom of Castle Lake, near Mount St. Helens. For three days, researchers ran a small boat over the lake surface equipped with an acoustic Doppler current profiler (ADCP). The ADCP bounces an acoustic wave off the bottom that is reflected back to a mobile receiver in the boat. The frequencies of the send-receive pairs are used to calculate depth. More

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Before the eruption of May 18, 1980, Mount St. Helens' elevation wa...

Before the eruption of May 18, 1980, Mount St. Helens' elevation wa...

Mount Adams elevation is 3,745 m (12, 286 ft). Mount St. Helens was the smallest of five major volcanic peaks in Washington State.