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Needs & benefits

On Jan. 23, 2020, all  lanes of State Route 4, west of Cathlamet closed between milepost 19 near Shannon Road and milepost 26 near Mullen Road due to a landslide. Using video of the slide captured with drone technology and ongoing hillside assessments, our Engineering Geologists developed a long-term fix to stabilize the hillside.

On Monday, Jan. 27, an emergency repair contract was awared to Nutter Corporation and cleanup work began on Wednesday, Jan. 29. On Saturday, February 8, 2020, a single lane of the highway reopened while long-term slope stabilization work continued. Crews worked with extreme caution and closely monitored the hillside as they removed approximately 50,000 cubic yards of debris from the site. Both lanes of the highway are now open as crews wrap up work on this project.

More information about our work to prevent and respond to unstable slopes and landslides is available on our Blog. Watch drone video of the landslide area.

Timeline

• January 2020 - Slide blocked the highway
• January 2020 - Emergency repair contract awarded to Nutter Corporation
• Summer 2020 - Construction began 
• Spring 2021 - Construction scheduled for completion