Efforts to stop landslides on the problem-plagued U.S. 20 realignment have failed, with costs nearing $230 million and no end in sight.
The landslide mitigation and earlier fines for pollution caused by erosion added about $76 million to the original $153 million cost and set the original completion date of October 2009 back by what was expected to be about two years. These landslides are constantly in a state of movement, and the mitigation efforts involved moving about 700,000 cubic yards of earth.
This confirms idea that many different factors can easily stir up a landslide, even if the threat seems low. Builders in this area are unfortunate to deal with such unpredictability, and the only hope is to build defense mechanisms from the engineering paradigm.
Article here:
http://www.oregonlive.com/pacific-northwest-news/index.ssf/2011/11/oregon_highway_officials_lands.html
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