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Images related to Cascades Volcano Observatory.

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Logs Floating in Spirit Lake, Mount St. Helens in the background....
Logs Floating in Spirit Lake, Mount St. Helens in the background.
Logs Floating in Spirit Lake, Mount St. Helens in the background.
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...
North Fork Toutle River, Sediment Retention Struct., Mount St. Helens
North Fork Toutle River, Sediment Retention Struct., Mount St. Helens
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.

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.

Mapping the North Fork Toutle River using a terrestrial laser scann...
Mapping the North Fork Toutle River using a terrestrial laser scann...
Mapping the North Fork Toutle River using a terrestrial laser scann...
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...
Water depth measurements at Spirit Lake, Mount St. Helens, using ac...
Water depth measurements at Spirit Lake, Mount St. Helens, using ac...
Map of the extent of Newberry lavas including approximate ages of s...
Extent of Newberry lavas including approximate ages of surficial flows
Extent of Newberry lavas including approximate ages of surficial flows
Extent of Newberry lavas including approximate ages of surficial flows

Extending approximately 75 miles north to south and 27 miles east to west, Newberry Volcano and its broad apron of lavas (light yellow shaded area) cover a total area of almost 1,200 square miles, making it the largest volcano of the Cascades volcanic chain. Its lavas stretch north beyond Smith Rock State Park, and south almost to Fort Rock State Natural Area.

Extending approximately 75 miles north to south and 27 miles east to west, Newberry Volcano and its broad apron of lavas (light yellow shaded area) cover a total area of almost 1,200 square miles, making it the largest volcano of the Cascades volcanic chain. Its lavas stretch north beyond Smith Rock State Park, and south almost to Fort Rock State Natural Area.

Mount Rainier rises above Tacoma, Washington and boat harbor, which...
Mount Rainier rises above Tacoma, WA and boat harbor, which may be ...
Mount Rainier rises above Tacoma, WA and boat harbor, which may be ...
Mount Rainier rises above Tacoma, WA and boat harbor, which may be ...

Mount Rainier rises above Tacoma, Washington and boat harbor, which may be impacted during the next eruption of the volcano.

Stream channel cross-section measurements—instrument that uses lase...
Stream channel cross-section measurements—instrument that uses lase...
Stream channel cross-section measurements—instrument that uses lase...
Stream channel cross-section measurements—instrument that uses lase...

Stream channel cross-section measurements—instrument that uses laser pulses to survey distance to a reflector operated by a second crew member, Mount St. Helens.

Global Positioning System receiver (called a GPS monument) at North...
Global Positioning System receiver (called a GPS monument) at North...
Global Positioning System receiver (called a GPS monument) at North...
Newberry caldera with Paulina Peak, Big Obsidian Flow and Paulina L...
Newberry caldera with Paulina Peak, Big Obsidian Flow and Paulina Lake
Newberry caldera with Paulina Peak, Big Obsidian Flow and Paulina Lake
Newberry caldera with Paulina Peak, Big Obsidian Flow and Paulina Lake

View looking south across Newberry caldera towards the Big Obsidian flow (left of center) and Paulina Peak, with Paulina Lake in foreground. Photo taken from the north rim of the caldera.

Aerial view of lakes and cinder cone at Newberry Volcano Caldera.
Aerial view of lakes and cinder cone at Newberry Volcano Caldera.
Aerial view of lakes and cinder cone at Newberry Volcano Caldera.
Aerial view of lakes and cinder cone at Newberry Volcano Caldera.

A view looking northeast across the central caldera of Newberry Volcano.  Paulina Lake is in the foreground and East Lake is in the distance.  The Central Pumice Cone lies between the two lakes. Near the bottom of the photo at the south edge of Paulina Lake, the two hills are named the Lakeshore Domes.

A view looking northeast across the central caldera of Newberry Volcano.  Paulina Lake is in the foreground and East Lake is in the distance.  The Central Pumice Cone lies between the two lakes. Near the bottom of the photo at the south edge of Paulina Lake, the two hills are named the Lakeshore Domes.

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

Lake elevation monitoring gage on Spirit Lake, Mount St. Helens. Do...
Lake elevation monitoring gage on Spirit Lake, Mount St. Helens. Do...
Lake elevation monitoring gage on Spirit Lake, Mount St. Helens. Do...
Lake elevation monitoring gage on Spirit Lake, Mount St. Helens. Do...

The USGS operates a real-time lake elevation monitoring gage on Spirit Lake to ensure water level does not exceed a safe limit. In 1985, the U.S.

Sun Creek Valley with Crater Lake in background, aerial view lookin...
Sun Creek Valley with Crater Lake in background, aerial view lookin...
Sun Creek Valley with Crater Lake in background, aerial view lookin...
Sun Creek Valley with Crater Lake in background, aerial view lookin...

Morning aerial view looking northwest up the valley of Sun Creek. Applegate Peak caps the prominent rock wall of the west side of Sun Notch at the caldera rim. Northwest caldera wall is visible on opposite side of Crater Lake through Sun Notch. Grayback Ridge in foreground is thick lava of pre-Mazama rhyodacite (410-460 ka).

Morning aerial view looking northwest up the valley of Sun Creek. Applegate Peak caps the prominent rock wall of the west side of Sun Notch at the caldera rim. Northwest caldera wall is visible on opposite side of Crater Lake through Sun Notch. Grayback Ridge in foreground is thick lava of pre-Mazama rhyodacite (410-460 ka).

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