These are some really fantastic photos of the Devil’s Slide tunnel construction. For those who aren’t familiar, the tunnels will be bypassing a particularly landslide and rockslide-prone portion of the California Coast that is currently traversed by Highway 1, the Pacific Coast Highway or PCH. [Source: . Image: kxyoung on Flickr]
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US 89 Bitter Springs Landslide Video Updates
Since I last posted about this landslide, ADOT has added several videos to their YouTube channel. It’s clear that this highway is going to be closed for the long term. ADOT and their on-call geotechnical consultant tasked with this project, Kleinfelder, are currently drilling boreholes to attempt to characterize the failure surface and determine what the geometry of the failure surface is. They are installing at least 10 inclinometers to try to determine the location of the slip plane or planes at depth and they have two extensometers to measure if any additional movement occurs. They are also performing LIDAR surveys as well. Check out the videos below.
Initial ADOT Video Describing the Failure
Click through for the videos!