Repairs resume on HWY 213 slide site in Mulino
The Oregon Department of Transportation began work on the second phase of pavement repairs at the site of an ancient slide on Highway 213 -- Cascade Highway South -- near S. Eldorado Road in Mulino.
The crack in the road developed last March above an ancient landslide, only recently discovered, that was reactivated during record-setting rains last winter.
In October, ODOT completed the first phase of repairs to the pavement, which was aimed at strengthening the road and repairing abrupt edges running across the highway.
The repairs involved installation of layers of rocks and geogrid, a strong plastic material that strengthens the road and allows some movement.
The pavement recently shifted in the areas between where the geogrid was installed. In the second phase of work, which began in January 2018, the contractor will install horizontal drains below the highway to help drain water from the landslide area.
In a landslide, water acts as a driving force. Installing drains creates an easier path for water to drain from the area, reducing the potential for additional movement.
If the slide moves significantly, before or during drain installation, lane closures and other traffic control may be necessary on Highway 213.
ODOT geologists and engineers are continuing to monitor the landslide and will address pavement conditions once drain installation is complete.