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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.

Contacts

Data Owner :
U.S. Geological Survey
Photographer :
Yehle, Lynn A.

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yla00001_ct.jpg thumbnail 91.42 KB image/jpeg
yla00001_ct.tif 595.89 KB image/geotiff
yla00001_ct_1200.jpg thumbnail 279.68 KB image/jpeg
yla00001_ct_1200.tif 2.69 MB image/geotiff

Material Request Instructions

Available in the U.S. Geological Survey Denver Library Photographic Collection, Photos stacks slides collection area, Yehle, L. A. Album.

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Type Scheme Key
Photo Number https://www.sciencebase.gov/vocab/category/item/identifier yla00001_ct

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