Louis Thompson Road Slide Repair

Summary

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

Work is substantially complete on the project. In the spring of 2019, the contractor will return to complete a pavement overlay that will cover the road cuts between 210th Place SE and 211th Place SE.

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.

Timeline

Construction is substantially complete on 1/2/2019.

Construction is planned to begin late September 2018 and finish in late December 2018. Single lane closures may be expected through December 21 while the wall, guardrail and planting items are completed.

Final road paving in the work area is planned for spring 2019 when temperatures are warmer.

Budget

$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.

  • Road Closure Map: 340 KB Adobe Acrobat Document - Map of the Louis Thompson Road Closure and Detour Route

Crane on Louis Thompson Road

Staff Contact