• Project

US 101 - S of Cosmopolis - Stabilize Slope

Project overview

Beginning in late August 2021, contractor crews for WSDOT will begin efforts to stabilize a portion of US 101 near Cosmopolis. This stretch of highway is often referred to by locals as Cosi Hill and sits on an active landslide zone. The roadway is prone to ongoing settlement concerns over the years. WSDOT has secured additional funding with a long-term fix to address the hillside and dropped pavement. Crews will repair the slope by installing 45 steel beams roughly 43 feet into the ground.

The roadway will remained reduced to a single lane with a temporary traffic signal until most of the work is complete. A majority of the work will take place away from the travel lanes.

August 2021 - Spring 2022
Project status
$5.3 Million
Project hotline

What to expect

Once construction begins, travelers will see alternating conditions with a temporary traffic signal through spring 2022. Any future highway closures will be announced in advance. Loads are restricted to no wider than 14 feet to provide enough clearance.

On January 24, 2020, crews discovered more than 12 inches of roadway settlement and reduced the highway to a single lane for safety purposes. Since then, the roadway has dropped more than five feet.