Crews have installed all 40 planned drains to relieve water pressure under the highway. Crews also installed two additional drains in the southern location. The drains are continuing to function well and draining significant volumes of water.
We installed geotechnical instrumentation so we can monitor the landslide area long-term.
We are also developing plans for a more permanent pavement repair now that the drains are in place. The repair will likely take place later this year.
Pavement has shifted at the site of an ancient landslide that reactivated last winter on Oregon 213 – Cascade Highway South – Near South Eldorado Road in Mulino.
ODOT developed a two-stage plan to address the landslide and the resulting pavement damage. Crews are currently working on the second phase of repairs.
The first phase of repairs is complete --
Beginning August 23, crews will excavate 5 feet down from the roadway to repair several sections of the highway near South Eldorado Road.
An estimated 3,000 cubic yards will be excavated – enough to fill 200 single dump trucks.
The contractor will insert layers of rock and geogrid, a material used to reinforce the highway base, and pave the surface.
The crack across the highway developed as an ancient landslide reactivated during record-setting rains over the winter. Later this year, ODOT plans to install horizontal drains below the highway to help drain water from the landslide area.
The second phase of work began in January 2018 --
The second phase of work is scheduled for this winter and will address the landslide. 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.
The installation process for the drains creates high water pressure, a source of landslides. The contractor will work from below the highway to install drains while monitoring the slide area and minimizing movement. Some movement of the slide area is expected.
near South Eldorado Road
Clackamas County has reopened Eldorado Road at its southern intersection with OR 213 as of April 20, 2018.
For questions about Eldorado Road, please contact Ellen Rogalin from Clackamas County at 503-742-4274.
The county has provided a handout for residents with resources. View the handout. You can also view a "Homeowner's Guide to Landslides" and a fact sheet about landslides in Oregon.
For ADA (Americans with Disabilities Act) or Civil Rights Title VI accommodations, translation/interpretation services, or more information call 503-731-4128, TTY (800) 735-2900 or Oregon Relay Service 7-1-1.
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