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Research notes : keeping Oregon coast traffic moving by keeping Highway 101 in place.
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2008-06-01
[PDF-506.90 KB]
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Alternative Title:Keeping Oregon coast traffic moving by keeping Highway 101 in place.
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Abstract:The study began in 2002 and data collection was completed in 2007. The objective was to determine what steps, if any, ODOT could take to prevent future movement on this or similar landslides. The study focused on the mechanics of the landslide and the relationship between ground movement, groundwater fluctuations, precipitation, bluff erosion and beach sand movement. The Johnson Creek landslide has been marginally stable but moves when groundwater levels rise to a threshold that is often reached during winter storms. Rainfall amounts over 55 to 60-milimeters (2.16-2.36 inches), occurring during a 24-hour period, appear to trigger movement. The rate of movement also appears to be tied to prior rainfall.
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