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ADOT: U.S. 89 repair will take two years, $40 million

Modified: Wednesday, Jul 10th, 2013

U.S. 89 buckled nearly five months ago.

Repairing the landslide-damaged U.S. 89 would take more than two years and $40 million, the Arizona Department of Transportation announced July 10.

Cutting back the mountain slope and constructing a gravity-buttress wall is part of the proposed solution to repair U.S. 89, which was damaged and closed Feb. 20.

After a geotechnical investigation that included geologic mapping, subsurface exploration and monitoring, laboratory tests and slope stability analyses, the final report has been submitted, according to ADOT. The 463-page report concludes the recent landslide was a reactivation of a small portion of an ancient landslide, but little to no new movement has occurred since testing began.

The report listed several alternatives for the ultimate repair of U.S. 89, but the construction of a landslide buttress and upslope lane adjustment was considered the most geotechnically feasible preferred alternative. The buttress, a wall-like support structure composed of rock, would be built at the base of the slope and the highway travel lanes would be moved farther to the east by creating a new cut into the existing slope in the Echo Cliffs.

For the complete article see the 07-17-2013 issue.

Click here to purchase an electronic version of the 07-17-2013 paper.

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