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North Cascades National Park, Washington. Glaciers at the head of Luna Creek in Picket Range. This complex of ice patches illustrates the difficulty of counting and classifying individual glaciers. A glacier fed by ice avalanches ends in Luna Lake on the left. Avalanches from the large irregular hanging glacier that clings to the cliffs feed the debris-covered ice upslope from another lake (foreground, right center). A small ice patch fed by snow avalanches lies at the base of the cliffs in right center. September 27, 1960. Plate 3-D, U.S. Geological Survey Professional paper 705-A. 1971.
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Photograph illustrating how temporary lakes are caused by periodically surging glaciers: Tikke Glacier at beginning of surge. Tikke Glacier, located north of Glacier Bay, is subject to periodic surges in which the ice suddenly advances several kilometers at approximately 20-year intervals. This view of the glacier was taken when a surge was moving rapidly down the glacier. Lateral valleys to the right of the glacier do not contain lakes: farther up glacier on the left side the fast-moving ice recently has dammed the lateral streams. British Columbia, Canada. August 1965. Published on sheet 3 of U. S. Geological Survey. Hydrologic investigations. Atlas HA-455. 1971.
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Photograph illustrating damage caused by outburst floods: Copper River. Copper River and Northwestern Railway bridge near Chitina being swept away by a major flood. Generally clear, balmy weather prevailed at the time so the flood is judged to have been due to a glacier-dammed lake outburst, probably originating from lakes dammed by Tazlina Glacier. Copper River region. Alaska. August 1932. (Photo by Alaska Department of Highways) Published on sheet 3 in U. S. Geological Survey. Hydrologic investigations. Atlas HA-455. 1971.
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Album caption: Effects of the Mount St. Helens eruptions in the upper valley of the South Fork Toutle River. Aerial photograph of mudflow deposits on the valley floor looking east toward steaming Mount St. Helens. Mount Adams in the distance. Skamania and Cowlitz Counties, Washington. June 30, 1980. (Photo by Austin Post) Published as figure 58-A in U S. Geological Survey. Professional paper 1249. 1982. Index card unavailable.
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Chickamin Glacier, on the eastern slopes of Dome Peak (2,723 m). This composite valley glacier (left) and slope glacier (right) demonstrates the variations that can take place even in a single ice mass. The tongue at the left has retreated since observations began in 1955, but the terminus on steep cliffs on the right advanced rapidly in the early 1950's and has remained little changed since then. Glacier Peak Wilderness, Skagit County, Washington. September 23, 1965. Published as plate 3-F in U.S. Geological Survey. Professional paper 705-A. 1971.
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Album caption: Oblique aerial view of the South Cascade Glacier, Cascade Mountains. Latah County, Washington. September 23, 1965. (Photo by Austin Post) Published on page 8 in U.S. Geological Survey. Glaciers: Clues to Future Climates? by Richard S. Williams, Jr. 1984. Index card:
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Photograph illustrating the variability of glacier-dammed lakes: Blockade Lake in the process of refilling. This lake in the Chigmit Mountains is impounded behind a massive ice dam 15.2 km (9.5 miles) in length formed where Blockade Glacier laterally enters a deep, narrow valley at the far end of the lake. Although the major flow of ice is to the eastern terminus, a portion of the ice flows toward the lake terminating in an ice cliff from which large icebergs are discharged. This lake does not dump annually but large changes in surface level indicate that the ice dam fails every few years causing major floods on McArthur River. Kenai quadrangle, Spurr district, Cook Inlet region, Alaska, cc 1970. Published on sheet...
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Unnamed glacier at the head of May Creek on Jack Mountain (2,721 m). This active glacier is east of the rain shadow formed by the Picket Range. Only small glaciers can be seen on the mountains in the background, many of which exceed 2,700 m in altutude. Pasayten Wilderness, Whatcom County, Washington. September 20, 1966. Published as plate 3-H in U. S. Geological Survey. Professional paper 705-A. 1971.
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Aerial view of glaciated topography in the La Sal Mountains, Note large moraine in center of photograph, numerous cirques and a rock glacier in center of lower left quadrant, Grand and San Juan Counties, Utah. n,d.
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Photograph illustrating how temporary lakes are caused by periodically surging glaciers: Tikke Glacier after the culmination of the surge shown in progress in photo no. 18. The advancing ice has now formed dams blocking both side valleys on the right side of the glacier. Since completing its rapid movement, the glacier has relapsed into near stagnation. The glacier-dammed lakes probably will fill and dump annually until melting removes the ice dams. Tikke Glacier is only one of nearly 200 surging glaciers in Alaska and adjacent Canada which can be expected to form hazardous lakes periodically. British Columbia, Canada. August 1966. Published on sheet 3 in U. S. Geological Survey. Hydrological investigations. Atlas...
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Photograph illustrating the variability of glacier-dammed lakes: Tulsequah Lake nearly drained by outburst flood. Tulsequah Lake, Coast Mountains, located just east of the international boundary in Canada. This lake generally drains catastrophically in late summer. The resulting floods move down the Taku River Valley where a highway connection to Juneau has been proposed. British Columbia, Canada. cc 1970. Published on sheet 3 of U. S. Geological Survey. Hydrologic investigations. Atlas HA-455. 1971.
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North Cascades National Park, Washington. Klawatti (center) and North Klawatti (right) Glaciers, north of Eldorado Peak. These glaciers have exhibited striking and diverse changes in recent years although they are closely adjacent. In 1947, stagnant ice from both glaciers covered the area of Klawatti Lake. At that time Klawatti Glacier ended on the steep cliff which it now descends in a spectacular icefall. Since 1947, the ice in the basin has melted. The lake, now 1 kilometer in length, has formed, and the Klawatti Glacier has advanced down the cliff. Meanwhile the lower part of North Klawatti Glacier has continued to thin. August 2, 1969. Plate 3-B, U.S. Geological Survey Professional paper 705-A. 1971.
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Alaska Glaciers. Skilak glacier, showing lateral and subglacial lakes. This ice-dammed lake is located in an embayment between Skilak glacier and an unnamed glacier in the Kenai Mountains. An exposed lake can be seen on the left; the radial pattern of crevasses in the center of the glacier suggests that this ice is raised and lowered by alternate filling and draining of a subglacial lake. Water from this lake created a devastating flood in the Kenai River valley in January 1969. Cook Inlet region, Alaska. On sheet 3 of U.S. Geological Survey. Hydrologic investigations. Atlas HA-455. 1971.
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North Cascades National Park, Washington. Boston Glacier. This largest single glacier in the North Cascades occupies a broad cirque northwest of Buckner Mountain (2,777 meters). Its terminus advanced rapidly between 1950 and 1955, and its area increased 17 percent during this period. September 27, 1960. Plate 3-E, U.S. Geological Survey Professional paper 705-A. 1971.
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Album caption: Aerial view of pit left after explosive eruption of July 22. Pyroclastic flows overrode low crater rim in foreground and moved downslope toward Spirit Lake, (north) of Mount St. Helens. Skamania County, Washington. July 24, 1980. (Photo by S. Lowther and A. Post) Published as figure 28 in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.
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Album caption: Oblique aerial photograph of Mount St. Helens summit area, showing location of infrared anomalies seen that evening on east extension of southern graben-fault. The two pairs of arrows and dashed line indicate warm fractures also shown in photo no. 53 (msh_1250_00053) Skamania County, Washington. March 30, 1980. (Photo by A. Post) Portion published as figure 153, U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.
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Album caption: Aerial view, eastern slope of Mount St. Helens showing Shoestring Glacier. Rock-covered surface of Shoestring Glacier is outlined by a thin dashed line. Swift Glacier can be seen just below left skyline on south slope of volcano. Conspicuous debris layers (angular, unsorted rock debris, about 1 m thick, embedded in ice) on Ape and Nelson Glaciers are shown by white arrows; debris layer on Shoestring Glacier is concealed by surface rock debris. Survey point Marmot is shown with a white X. Approximate crater rim following May 18 eruption is shown by heavy dashed line. Skamania County, Washington. September 29, 1979. (Lines and arrows on published photo only) (Photo by A. Post, photo no. USGS 79 L6-016)...
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Album caption: Aerial photograph of Mount St. Helens taken from about 7 miles to the north-northwest, looking over the site of the demolished Coldwater II observation post (marked by an X on published photo only) and debris avalanche deposits in the eastern part of the North Fork Toutle River valley. Skamania County, Washington. June 30, 1980. (Photo by Austin Post) Published as figure 51 in U.S. Geological Survey. Professional paper 1249. 1982. Index card unavailable.
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Album caption: Mount St. Helens in eruption, showing the upper third of the mountain. Skamania County, Washington. May 18, 1980. (Photo by Austin Post) Handwritten notes on album caption: (8053 172) Index card unavailable.
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White Chuck Glacier, south of Glacier Peak. After retreating 430 m between 1949 and 1967, it is now an example of a nearly stagnent glacier. Its mean altitude is 2.145 m. Glacier Peak Wilderness, Snohomish County, Washington. October 16, 1966. Published as plate 3-G in U. S. Geological Survey. Professional paper 705-A. 1971.
map background search result map search result map Mount St. Helens in eruption, showing the upper third of the mountain. Skamania County, Washington. 1980. Effects of the Mount St. Helens eruptions in the upper valley of the South Fork Toutle River. Skamania and Cowlitz Counties, Washington. 1980. Oblique aerial photograph of Mount St. Helens summit area. Skamania County, Washington. 1980. Aerial view of pit left after explosive eruption of July 22, Mount St. Helens. Skamania County, Washington. 1980. Aerial view, eastern slope of Mount St. Helens showing Shoestring Glacier. Skamania County, Washington. 1979. North Cascades National Park, Washington. Klawatti (center) and North Klawatti (right) Glaciers, north of Eldorado Peak. Glaciers at the head of Luna Creek in Picket Range. North Cascades National Park, Washington. 1960. North Cascades National Park, Washington. Boston Glacier. This largest single glacier in the North Cascades occupies a broad cirque northwest of Buckner Mountain (2,777 meters). 1960. Oblique aerial view of the South Cascade Glacier, Cascade Mountains. Latah County, Idaho. 1965. Oblique aerial view of the South Cascade Glacier, Cascade Mountains. Latah County, Idaho. 1965. Mount St. Helens in eruption, showing the upper third of the mountain. Skamania County, Washington. 1980. Oblique aerial photograph of Mount St. Helens summit area. Skamania County, Washington. 1980. Aerial view of pit left after explosive eruption of July 22, Mount St. Helens. Skamania County, Washington. 1980. Aerial view, eastern slope of Mount St. Helens showing Shoestring Glacier. Skamania County, Washington. 1979. North Cascades National Park, Washington. Klawatti (center) and North Klawatti (right) Glaciers, north of Eldorado Peak. Glaciers at the head of Luna Creek in Picket Range. North Cascades National Park, Washington. 1960. North Cascades National Park, Washington. Boston Glacier. This largest single glacier in the North Cascades occupies a broad cirque northwest of Buckner Mountain (2,777 meters). 1960. Effects of the Mount St. Helens eruptions in the upper valley of the South Fork Toutle River. Skamania and Cowlitz Counties, Washington. 1980.