Unified Interior Regions

Region 9: Columbia-Pacific Northwest

Regions L2 Landing Page Tabs

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Worm Complex on the southeast flank of Mount St. Helens—Middle Kala...
September 28, 1979

Worm Complex on the SE flank of Mount St. Helens—Middle Kalama lava...

Worm Complex on the southeast flank of Mount St. Helens—Middle Kalama lava flows in center of image. Photo from September 28, 1979. Click to view larger image.

Goat Rocks age eruptive deposits (Mount St. Helens), Floating Islan...
September 28, 1979

Goat Rocks age eruptive deposits (Mount St. Helens), Floating Islan...

Studebaker Ridge formed during the Tertiary geologic time period (65 million to 2.6 million years ago). The pyroclastic surge from the May 18, 1980 eruption destroyed the trees on the ridge.

Aerial photo of Mount St. Helens volcano, pre-1980 eruption
September 28, 1979

Aerial photo of Mount St. Helens volcano, pre-1980 eruption

Before the eruption of May 18, 1980, Mount St. Helens' elevation was 2,950 m (9,677 ft). View from the west, Mount Adams in distance. S. Fork Toutle River is valley in center of photo.

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

Measuring sturgeon length
January 1, 0000

Researcher measuring sturgeon length

Researcher measuring sturgeon length. Bottom trawl for young-of-year (YOY) indexing. Columbia River.

Interactive before/after image of barred owl sightings

Use the green slider tool in the center to view locations of barred owl sightings recorded during 2015 and 2020 owl monitoring activities at the Oregon Coast Range study area. Barred owls were lethally removed from the areas highlighted in pink. Preliminary results indicate that removals have significantly increased the site-level extinction probability of barred owls and

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Digital Elevation Map of Mount St. Helens with annotation of pre-19...

Digital Elevation Map of Mount St. Helens with annotation of pre-19...

This shaded relief image was produced from LIDAR data. LIDAR is an acronym for Light Detection and Ranging, a modern remote sensing technique used to map topography very accurately—more so than is possible with older techniques. The crater is 1.2 miles (1.9 km) wide east-west. Elsewhere the scale varies owing to the oblique viewing angle. The landslide deposit includes

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Digital Elevation Model for Newberry Volcano and vicinity....

Digital Elevation Model for Newberry Volcano and vicinity.

High-resolution digital elevation dataset for Newberry Volcano and vicinity, Oregon, based on lidar survey of August-September, 2010 and bathymetric survey of June, 2001.

Image: Salmon River, Shoup, Idaho

Salmon River, Shoup, Idaho

Middle fork of the Salmon River near Shoup, Idaho.

Image: Ice flow at Enaville, Idaho

Ice flow at Enaville, Idaho

Ice flow at Sta. 12413000 NF Coeur d’ Alene River at Enaville, ID.