The geotechnical investigations and report are complete for the US 89 Bitter Springs Landslide south of Page, Arizona. ADOT published a news release with the results of Kleinfelder’s geotechnical investigation and a link to their geotechnical report. The recommended mitigation for the 1,200 foot long, 135 foot deep landslide is to cut into the uphill slope and move the road approximately 60 feet and to use the resulting material to construct a gravity buttress at the toe of the slide. Other options considered but rejected were rerouting the road, some form of active stabilization using a retaining wall, and simply closing the road. The repairs are estimated to cost $40M and take approximately 2 years to complete. The video below shows an interview with Steve Boschen, Deputy State Engineer for Arizona describing the alternatives that were considered. [Source: Check out the full ADOT Press Release and download the report via Arizona Geology Blog. Image: ADOT]
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Landslide Closes SR 14 in Utah
A large landslide has closed SR 14 east of Cedar City, Utah. UDOT expects that the road will be closed for up to 2 weeks for cleanup and to ensure that the slope is safe. Boulders up to an estimated 20 tons are now blocking the road and will likely need to be blasted down to a smaller size. A UDOT spokesman interviewed on the video shown after the break estimate the size of the slide at 700 to 800-ft long and 10 to 12-ft thick.
Questions linger a year after Logan canal burst triggered a deadly landslide
July 12, 2010
rockman
Geologic Hazards
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