• Project

SR 401 - 2.3 Miles S. of Bean Creek Bridge - Slope Stabilization

Project overview

On Tuesday, Feb. 23, 2021, due to roadway settlement caused by heavy rainfall, both directions of State Route 401 (also known as the Lewis and Clark Trail Highway) between the Astoria-Megler Bridge and Naselle were closed.

In spring 2021, emergency contractor crews were able to reopen a single-lane of the highway, allowing travelers access through the area by alternating intermittently through a single-lane with an automated traffic signal.

Currently, our geotechnical engineers are working to determine a long-term fix to stabilize and reopen the highway, and improve the drainage system which will minimize the chances of future slides. As part of this project, contractor crews will make improvements to the Knappton Boat Launch located off of SR 401 along the Columbia River. Contractor crews will regrade the gravel boat launch site area and replace vandalized signs.

This project is scheduled to go to competitive bidding in summer 2022 and construction is scheduled to begin in late summer/early fall 2022.

Timeline
February 2021 - Late 2022
Project status
Pre-construction
Funding
$2 Million

What to expect

Once construction begins, crews will likely need to fully close the highway for up to three weeks to perform slope stabilization, drainage improvement, and road repair work – contractor crews will detour travelers around the full closure using SR 4 and US 101. 

On Tuesday, Feb. 23, 2021, due to roadway settlement caused by heavy rainfall, both directions of State Route 401 (also known as the Lewis and Clark Trail Highway) between the Astoria-Megler Bridge and Naselle were closed. 

In spring 2021, emergency contractor crews were able to reopen a single-lane of the highway, allowing travelers access through the area by alternating intermittently through a single-lane with an automated traffic signal.