Louis Thompson Road Slide Repair


This project constructs a new retaining wall to repair slope damage below Louis Thompson Hill Road at 210th Place SE. A new culvert will be constructed across the road and a roadside bio-retention feature will be constructed between 211th and 210th Place SE.

Project Updates

9/24/2018  Construction begins. Expect single lane closures on Louis Thompson Road near 210th Place SE.

Construction awarded to R.W. Scott Construction Co. of Auburn, WA.

Goals and Benefits

This project will repair slope damage and prevent undermining of the roadway at the existing retaining wall. The stormdrain modifications will help address the flooding and erosion that caused the washouts, and prevent erosion into upper Zackuse Creek.


Construction is planned to begin late September 2018 and finish by December 2018.


$1,275,730 Construction contract. This project is funded in part by the King County Wastewater Treatment Division (WaterWorks grant).

Permits, Environmental Review

Hydraulic Project Approval was obtained from Washington Department of Fish and Wildlife to restore the stream buffer at the base of the wall failure.

Staff Contact