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Mudflow line at Muddy River, Skamania County, Washington. 1980. USGS scientist measuring mudflow line at Muddy River, near bridge. Compare height of mudlines with height of scientist at right. Skamania County, Washington. October 12, 1980. Published in lower photo, U.S. Geological Survey Earthquake Information Bulletin, v. 16, no.2, March-April 1984, p.109. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Large boulder carried in lahar flow, Muddy River, Skamania County, Washington. 1980. Large boulder carried in lahar flow, Muddy River. Geologists for scale. Skamania County, Washington. September 16, 1980. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Mount St. Helens crater deformation, Skamania County, Washington. 1981. Mount St. Helens crater deformation. USGS scientists measuring small thrust fault. Skamania County, Washington. May 12, 1981. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Tree blowdown, South Fork Toutle River, Cowlitz County, Washington. 1981. Tree blowdown on the South Fork Toutle River showing small stand of trees protected from the force of the blast but not from the heat. Cowlitz County, Washington. August 14, 1981. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Confluence of Muddy River and Smith Creek, ​Skamania County, Washington. 1980. Oblique aerial view of confluence of Muddy River and Smith Creek, east of Mount St. Helens, after heavy rains. Skamania County, Washington. January 14, 1981. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Making deformation measurements, Skamania County, Washington. 1982. USGS scientists making deformation measurements, north side of Mount St. Helens dome. Geologists and equipment in foreground. Skamania County, Washington. August 17, 1982. Published in U.S. Geological Survey Earthquake Information Bulletin, v. 16, no.2, March-April 1984, pp90-91. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Early warning gage, downstream from Spirit Lake, ​Skamania County, Washington. 1982. Early warning gage, downstream from Spirit Lake, in the vicinity of Mount St. Helens. Skamania County, Washington. December 4, 1982. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Mount St. Helens dome, ​Skamania County. 1983. USGS scientists studying the dome. Note size of scientists, in orange in lower left, as compared to dome. Skamania County, Washington. May 26, 1983. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Tree blowdown near Elk Rock, Cowlitz County, Washington. 1980. Tree blowdown near Elk Rock, 11 miles from Mount St. Helens. Cowlitz County, Washington. August 22, 1980. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Spirit Lake, Mount Rainier in the background, Skamania County, Washington. 1982. Oblique aerial view of Spirit Lake with Mount Rainier in the background. On May 18, 1980, part of the Mount St. Helens debris avalanche slid into Spirit Lake, raising its level nearly 60 meters and damming its natural outlet to a higher level. Water displaced by the avalanche surged up the surrounding hill slopes, washing the blown-down timber from the lateral blast into the lake. Water is currently is being pumped out of Spirit Lake to prevent it from overtopping its dam. September 1, 1982. Skamania County, Washington. Published in U.S. Geological Survey Earthquake Information Bulletin, v. 16, no.2, March-April 1984, pp.112-113. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Phreatic explosion pit, Skamania or Cowlitz Counties. 1980. Oblique aerial view of phreatic explosion pit after erosion and fill. Note scientists for scale. Skamania or Cowlitz County, Washington. October 1983. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Deformation project's outer net Muddy River site, Skamania County, Washington. 1983. Deformation project's outer net Muddy River site, southeast of Mount St. Helens. Geologists at work. Skamania County, Washington. July 11, 1983. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Deformation project's outer net Butte camp site, Skamania County, Washington. 1983. Deformation project's outer net Butte camp site, southwest of Mount St. Helens. Geologists at work. Skamania County, Washington. July 11, 1983. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Remains of the Muddy River Bridge, Skamania County, Washington. 1981. Remains of the Muddy River Bridge along the Muddy River, east of Mount St. Helens. Person at left for scale. Skamania County, Washington. April 3, 1981. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Dredging on the Cowlitz River, ​Cowlitz County, Washington. 1981. View of dredging on the Cowlitz River. View taken from the middle of the river looking towards the bank, dredge spoils piled up in the background. Note USGS survey crew on the bank for scale. Cowlitz County, Washington. February 4, 1981. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Lahar, Muddy River drainage, ​Skamania County, Washington. 1980. View of lahar, from May 18, 1980, which flowed down the Muddy River drainage, southeast flank of Mount St. Helens. Skamania County, Washington. September 24, 1980. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Mount St. Helens, ​Skamania County, Washington. 1981. View of Mount St. Helens from the northwest, taken from south of Chehalis. Skamania County, Washington. February 28, 1981. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Coldwater Lake, Skamania and Cowlitz Counties. 1983. Oblique aerial view of Coldwater Lake, which resulted when the debris avalanche of May 18, 1980, filled the Toutle River Valley, damming a side channel. Skamania and Cowlitz Counties, Washington. October 12, 1983. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) Measuring pressure and air temperature, Skamania County, Washington. 1981. Scientists measuring pressure and air temperature in Mount St. Helens' crater during EDM measurements from Harrys Ridge. Skamania County, Washington. August 1981. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) USGS radio repeater station on Coldwater Peak,Skamania County, Washington. 1981. USGS radio repeater station on Coldwater Peak, north of Mount St. Helens. Skamania County, Washington. August 31, 1981. Categories: Image; Tags: CVO Cascade Volcano Observatory Collection, Mount St. Helens, Photographers, Volcanoes, color transparency (slides) 1 2 3 »