Differential subsidence of roadbed of the standard gauge Copper River and Northwestern Railway near Strelna, 75 miles northeast of Valdez. Kuskulana district, Copper River region, Alaska. 1960.
Dates
Date Taken
1960-09
Summary
Slide description and index card: Differential subsidence of roadbed of the standard gauge Copper River and Northwestern Railway near Strelna, 75 miles northeast of Valdez. The thermal equilibrium of the fine-grained sediments underlying the roadbed was disrupted during construction and the permafrost started to thaw differentially. Maintenance and use of the railroad was discontinued in 1938. Subsidence as well as lateral displacement, however, has continued. Kuskulana district, Copper River region, Alaska. September 1960. Published as Figure 20 in U.S. Geological Survey. Professional Paper 678. 1969; Figure 65 in U.S. Geological Survey. Professional Paper 1616. 1999.
Summary
Slide description and index card: Differential subsidence of roadbed of the standard gauge Copper River and Northwestern Railway near Strelna, 75 miles northeast of Valdez. The thermal equilibrium of the fine-grained sediments underlying the roadbed was disrupted during construction and the permafrost started to thaw differentially. Maintenance and use of the railroad was discontinued in 1938. Subsidence as well as lateral displacement, however, has continued. Kuskulana district, Copper River region, Alaska. September 1960.
Published as Figure 20 in U.S. Geological Survey. Professional Paper 678. 1969; Figure 65 in U.S. Geological Survey. Professional Paper 1616. 1999.
Available in the U.S. Geological Survey Denver Library Photographic Collection, Photos stacks slides collection area, Yehle, L. A. Album.
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