A huge 35,000 to 40,000 cubic yard landslide has blocked Highway 26/89 for about 300 feet with material about 40 feet high. The slide is about 2000 feet long, terminating in the Snake River. It is still moving about 1 foot per day. Plans are in place to begin clearing the material, but WYDOT does not want to start until the risk of more material coming down has subsided. [Source: Jackson Hole News&Guide via USGS Landslide Events]
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Last week was the annual American Council of Engineering Companies of Arizona Roads and Streets Conference in my home town of Tucson, Arizona. Its a transportation themed conference as you might guess, but there are usually a few geotechnical-type presentations. This year, there was an excellent presentation on the SR 87 Landslide that occurred about 1-year ago on the highway between Phoenix and Payson. The presentation was given by Keith Dhalen, PE with AECOM , Wayne Harrison, RG also with AECOM and Scott Neely, PE with Terracon . Read on for my recap of the presentation. (Photo by ADOT via AZGS)