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Mount St. Helens and the industrial waterfront area of North Portla...
December 30, 2012

Mount St. Helens and the industrial waterfront area of North Portla...

Mount St. Helens and the industrial waterfront area of North Portland, Oregon along the Willamette River in the foreground. Excess sediment from volcanoes can significantly impact river traffic.

Logs Floating in Spirit Lake, Mount St. Helens in the background....
November 27, 2012

Logs Floating in Spirit Lake, Mount St. Helens in the background.

Logs float in Spirit Lake near the Spirit Lake gaging station and outflow tunnel. View is to the south with Mount St. Helens in the background.

North Fork Toutle River Above the Sediment Retention Structure, Mou...
November 27, 2012

North Fork Toutle River, Sediment Retention Struct., Mount St. Helens

The May 18, 1980 eruption of Mount St. Helens had a dramatic impact on the North Fork Toutle River. The debris avalanche, lateral blast and ashfall produced a substantial amount of sediment, which continues to be washed into the river and transported downstream. A Sediment Retention Structure was constructed (out of view) to minimize the amount of sediment flowing

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Mapping the North Fork Toutle River using a terrestrial laser scann...
August 14, 2012

Mapping the North Fork Toutle River using a terrestrial laser scann...

The USGS, in collaboration with UNAVCO and the University of Colorado, uses these data to measure channel erosion and deposition in the reach.

Water depth measurements at Spirit Lake, Mount St. Helens, using ac...
July 11, 2012

Water depth measurements at Spirit Lake, Mount St. Helens, using ac...

Back at the USGS Cascades Volcano Observatory office, these data are merged with airborne LiDAR data to calculate lake volume.

December 31, 2011

Time-series of dome & glacier growth at Mount St. Helens, WA

The video shows time-lapse changes in the lava dome and Crater Glacier from 2004-2012. The images were created from 1:12,000 scale vertical aerial photographs combined with ground control points from campaign GPS and targets. Photogrammetry software was used to collect a 3-D point cloud and combined to make a digital elevation model (DEM). Information regarding volume and

Gas sampling with a CO2 Infrared Spectrometer at Mount St. Helens' ...
July 6, 2011

Gas sampling with CO2 Infrared Spectrometer at Mount St. Helens

Gas sampling with a CO2 Infrared Spectrometer at Mount St. Helens' September Lobe lava dome, Washington.

Mt. St. Helens at sunset
June 30, 2011

Mt. St. Helens viewed at sunset

View of Mt. St. Helens at sunset, taken sometime after the crater forming eruption in 1980.

Suspended sediment sample collection from the North Fork Toutle Riv...
December 16, 2010

Suspended sediment sample collection from the North Fork Toutle Riv...

Suspended sediment sample collection from the North Fork Toutle River above the Sediment Retention Structure, downstream from Mount St. Helens.