Filters: Tags: CVO-A Cascades Volcano Observatory Collection (X)
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Index card: Oblique aerial view looking downstream on Muddy River at a point immediately downstream from where Muddy River plunged through the canyon. Note the trees left in the middle of the mudflow, and note in particular a rock (see also slide no. 13ct (cvoa0013_ct)) downstream from a clump of trees in the center of the slide. Skamania County, Washington. May 19, 1980.
Index card: A small plane made a successful forced landing near Mount St. Helens. Skamania County, Washington. 1980.
Index card: "Injured man" trapped in ash along east shore of Spirit Lake. Two men had hiked in from the east and were later rescued. Skamania County, Washington. 1980.
Index card: Worms in water along Muddy River, as life comes back to the area. Skamania County, Washington. 1980.
Index card: Oblique aerial view of secondary steam fumarole near Spirit Lake. Fumarole is 300 feet in diameter. Eruptions occurred hourly and continued for two months after May 18, 1980. Skamania County, Washington. 1980.
Index card: View of the mudflow beginning to move downstream from the blast material deposited in the North Fork Toutle valley. This mudflow took nine hours to build in size sufficient to reach through the blasted material and move downstream to the Cowlitz River valley. The mudflow on the South Fork Toutle River arrived at Castle Rock three hours after the eruption of Mount St. Helens and that from the North Fork by 12 hours. Cowlitz County, Washington. May 18, 1980. (Photo by Harry Glicken, USGS/CVO).
Index card: Nearer view of two large rocks deposited on roadway of remaining abutment on right side of Pine Creek channel near its mouth. This suggests that these large rocks were riding very high in the mudflow and were pushed laterally and deposited away from the mudflow. Geologists for scale. Skamania County, Washington. 1980. (Photo by R.R. Adsit, USGS/WRD).
Index card: Cleanup of ash in Yakima. Yakima County, Washington. 1980. (Photo by U.S. Soil Conservation Service).
Index card: This graph shows the elevation of the thalweg Cowlitz River from the Lewis County line to the Columbia River. Note its position prior to the May 18, 1980 mudflow shown by the brown cross-hatch. The bed of the river was raised 12 to 15 feet throughout its entire length. Cowlitz County, Washington. 1980.
Index card: Oblique aerial view of bridge displaced in the North Fork Toutle River valley. Note the battering of the superstructure by logs and rocks from the mudflow. Cowlitz County, Washington. 1980. (Same as MSH-PP 1249 no. 35ct (msh_1249_00035_ct)). Published as Figure 31-D in U.S. Geological Survey. Professional Paper 1249. 1982.
Index card: Oblique aerial view of mudflow deposits at Camp Baker, a logging camp located about 17 miles downstream in the North Fork Toutle River valley. Note the fully loaded logging train at the right of the picture, and the overturned logging equipment. Cowlitz County, Washington. 1980.
Index card: Blast crossed divide and reached into South Fork Toutle River valley here. Note standing trees killed by the blast - seven miles downstream from the mountain. Cowlitz County, Washington. 1980.
Index card (50ct-52ct): Oblique aerial views showing devastation to the topography of the Toutle River valley. All pictures show damaged buildings/houses. Cowlitz County, Washington. 1980.
Index card: Oblique aerial view looking downstream on the Cowlitz River mud deposits on the overbanks ranging in depth to 15 feet. Cowlitz County, Washington. 1980.
Index card: View looking upstream at the Smith Creek drainage basin. Smith Creek, a tributary to Muddy River, was inundated by several feet of mud, and phreatic eruptions can be seen occurring through the mudflow. Note the trees stripped from the hills and fires burning on the hills; also the deposit of trees on and through the mudflow. On the left of the slide you can see water beginning to flow over the surface of the newly deposited mudflow. Skamania County, Washington. May 19, 1980.
Index card: Oblique aerial view of North Fork Toutle River valley, one can see the topography of the blast material, large gullies cut by the subsequent mudflows, deposits of mud splashed on the hummocks of the blast material, and subsequent slumping of material into the gullies, creating natural barriers to flow. Cowlitz County, Washington. May 19, 1980.
Keyhole shaped crater in floor of the crater of Mount St. Helens. Skamania County, Washington. 1980.
Index card: Oblique aerial view of a keyhole-shaped crater in floor of the crater of Mount St. Helens. The notch at the upper left is the remains of Shoestring Glacier. Skamania County, Washington. 1980.
Index card: A nearer view of tree torn from base on Harry's Ridge, five miles north of Mount St. Helens crater. Skamania County, Washington. 1980.
Index card: Most of the pumice is baseball to basketball sized stones - geologist for scale. Note how flow follows topography. Skamania or Cowlitz County, Washington. 1980.
Index card: Oblique aerial view of mud deposited in the North Fork Toutle River valley, which rose to an elevation of only 15 feet below the Interstate 5 bridge, near center of view. Note mud being pushed upstream (to the right) on the Cowlitz River. Cowlitz County, Washington. 1980.
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