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 near milepost 5.0, allowing travelers access through the area by alternating intermittently through a single-lane with an automated traffic signal.
In late summer 2023, contractor crews will begin work to stabilize the slope, improve drainage and repair the roadway. Additionally, as part of this project, contractor crews will make improvements to the Knappton Boat Launch located off of SR 401 along the Columbia River near milepost 4.0. Contractor crews will regrade the gravel boat launch site and parking area and replace vandalized signs.
What to expect
**UPDATE 10-1-2024**
Crews will take advantage of the planting window by adding landscaping and planting trees along the slope running alongside SR 401. Trees and landscaping play an important key role in slope stabilization by anchoring the soil with root systems, helping to prevent erosion and reducing the risk of debris and mud slides. Contractor crews will utilize alternating single lane closures with flaggers.
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 and parking area and replace vandalized signs.
In late summer 2023, contractor crews will begin work to stabilize the slope, improve drainage and repair the roadway. Additionally, as part of this project, contractor crews will make improvements to the Knappton Boat Launch located off of SR 401 along the Columbia River near milepost 4.0. Contractor crews will regrade the gravel boat launch and parking area and replace vandalized signs.