Filters: Tags: CVO-A Cascades Volcano Observatory Collection (X)
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Index card: Trees bent in the downstream direction were all sanded off to sharp needle points. Cowlitz County, Washington. 1980.
Index card: Closer oblique aerial view of the rampart and crater of Mount St. Helens. Note lava dome in center of slide. Skamania County, Washington. 1980.
Index card: Caked mudflow material on debris below Coldwater Lake. Mount St. Helens in background. Skamania County, Washington. 1980.
Index card: Oblique aerial view of Mount St. Helens, after the May 18 eruption, from the same point as photo 72ct (cvoa0072_ct). Forests are gone. Light-colored material is pumice from pyroclastic flows. Note material blasted over ridge into South Coldwater Creek. Skamania County, Washington. September 8, 1980. (Photo by Harry Glicken, USGS/CVO).
Index card: Oblique aerial view of the devastation at the Green River Fish Hatchery, located near Kid Valley. Cowlitz County, Washington. 1980.
Index card: Oblique aerial view of Swift Reservoir. Notice the mud and rocks deposited in the reservoir, and that the water at this point in time is still relatively clear. On the left bank (background) of the reservoir one can see several vacation-type homes which barely escaped the mudflows entering the reservoir. Skamania County, Washington. May 19, 1980. (Same as MSH-PP 1249 no. 37ct (msh_1249_00037_ct)). Published as Figure 33 in U.S. Geological Survey. Professional Paper 1249. 1982.
Index card: Closer view of rock in Muddy River noted in slide no. 12ct (cvoa0012_ct). The diameter of the rock is approximately 30 feet. This rock was carried downstream during the May 18, 1980 mudflow, and deposited on cut logs located in the riverbed. Geologist for scale. Skamania County, Washington. 1980.
Index card: A hot spot in the pyroclastic flows; geologist J.R. Williams examines a fumarole area within the cooler avalanche deposit at the northern base of Mount St. Helens. Sulphur stains on the pumice; note the relatively small particle size of the material. Rocks are very dense and hot; heat was derived from hot rock material buried within the deposit. Skamania or Cowlitz County, Washington. June 5, 1980. (Same as MSH-PP 1249 40ct). Published as Figure 37-A in U.S. Geological Survey. Professional Paper 1249. 1982.
Index card: View of trees torn from their base, on Harry's Ridge five miles north of Mount St. Helens crater. Skamania County, Washington. 1980.
Index card: Clean water flowing from spring in the blast area near Elk Rock, 13 miles downstream from the mountain. Blast deposit here is 150 feet deep. Cowlitz County, Washington. 1980.
Index card: Oblique aerial view showing an interesting pattern of the pyroclastic flow from Mount St. Helens. Skamania or Cowlitz County, Washington. 1980.
Index card: Oblique aerial view of trees blasted down in a 150-square-mile area. Skamania and/or Cowlitz County, Washington. 1980.
Index card: Numerous pools were left in the debris. Color of water depended upon chemical quality of the water. Cowlitz County, Washington. 1980.
Index card: New vegetation breaking through ash deposits along North Fork Toutle River. Cowlitz County, Washington. 1980.
Index card: South Fork Toutle River. The railroad bridge was washed away leaving the rail hanging. Cowlitz County, Washington. 1980.
Index card: Oblique aerial view across Spirit Lake after the eruption of Mount St. Helens; secondary steam fumaroles in blast area in foreground. Skamania County, Washington. 1980.
Index card: View from crater north toward valley where material was blasted over the divide to form the mudflow down South Fork Coldwater Creek. Skamania County, Washington. 1980.
Index card: Oblique aerial view of downed trees over Highway 504 and Weyerhaeuser logging road (at right). Car in them is at the bend in the highway. Cowlitz County, Washington. 1980.
Index card: Closer Oblique aerial view of one of the larger secondary fumaroles, about 500 feet in diameter. Cowlitz County, Washington. 1980.
Index card: Nearer oblique aerial view of the eruption of May 18, 1980. Skamania County, Washington. May 18, 1980. (Photo by Donald A. Swanson, USGS/CVO).
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