The Oregon DOT stopped work on a 10-mile stretch of Highway 20 back in 2010 after several landslides were discovered during construction. Four bridges that were constructed by Yaquina River Constructors, a subsidiary of Granite Construction, were displaced by the landslides. The contractor was paid a total of $173 million for the project, and under the terms of the settlement, $15 million was returned to the State. According to an ODOT spokesman, they are looking to rebid the project this year with a projected completion date of 2015, 6 years behind the original schedule. The winning bid for the original project was $129 million, and the new projected cost is $290 to $310 million. [Source: TDN.com. Image: NewsLincolnCounty.com]
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The Utah Geologic Survey has released a "Landslide Susceptibility Map of Utah". They apparently relied quite heavily on GIS based thresholding of existing slope angles but only after they had statistically analyzed failure angles for particular geologic units. So it sounds like they throw the known landslides, the geologic map of Utah and a DEM into the GIS a blend it all up. Perhaps a slight oversimplification!
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