Project news

• This project was awarded to Granite Construction Company on Aug. 20, 2020
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Needs & benefits

A single lane of State Route 4, west of Cathlamet, is now open after a landslide closed the highway in both directions on Jan. 23, about 10 miles west of Cathlamet, between milepost 19 near Shannon Road and milepost 26 near Mullen Road. 

All lanes are now open.  The Washington State Department of Transportation removed approximately 50,000 cubic yards of debris from the site during the slope stabilization along the hillside. 

On Monday, Jan. 27, WSDOT awarded an emergency repair contract to Nutter Corporation and cleanup work began on Wednesday, Jan. 29. Crews worked with extreme caution and closely monitored the hillside.

Using video of the slide captured with drone technology and ongoing hillside assessments, WSDOT Engineering Geologists developed a long-term fix to stabilize the hillside.

Engineering geologists have evaluated the hillside and determined it is safe to allow traffic through the highway. 

More information about WSDOT’s work to prevent and respond to unstable slopes and landslides is available on the WSDOT Blog.

Watch new drone video

Timeline

• January 2020 - Slide blocked the highway
• January 2020 - Emergency repair contract awarded to Nutter Corporation
• Summer 2020 - Project awarded 
• Fall 2020 - Construction Complete