Perkins Lane W Retaining Wall Mitigation Project

Updated: 2025

We are pleased to announce that the construction of the Perkins Lane Retaining Wall has been successfully completed. The completion of this project marks a significant milestone in ensuring the safety and stability of the area. Integral to the project were several upgrades, including the installation of the retaining wall, enhancements to the water main and drainage systems, and improvements to the paving.  We are thankful for the collaborative spirit and patience demonstrated by the Perkins Lane community throughout the construction process. With these upgrades in place, we are confident in the long-term resilience and safety of the infrastructure serving this community. 

Retaining walls have a crucial role in maintaining the safety and functionality of Seattle's infrastructure. They support sloped landscapes and prevent soil erosion, reducing the risk of landslides that could threaten roads and public safety. We understand the importance of these structures in safeguarding the city's landscape. Currently, SDOT is responsible for maintaining almost 600 retaining walls across the city, each varying in height, with an average of 6 feet. If aligned end to end, these walls would stretch for an impressive 21 miles, underscoring the extensive infrastructure required to protect and sustain Seattle's roadways and communities. 

Overview

In coordination with Seattle City Light and Seattle Public Utilities, we're mitigating against landslides by constructing an approximately 180 feet long, soldier pile wall along the bottom of the slope on the east side of Perkins Ln W. 

The soldier pile design was selected to avoid the need for excavation into the slope and follows designs implemented during the landslide mitigation work along Rainier Ave S

Project Gallery

Project Area

 Map showing position of wall at 2800 Perkins Lane W

Background

SDOT maintains almost 600 retaining walls, most protecting public streets. The average height is 6 feet, and if all the retaining walls and seawalls were lined up end to end, they would extend for 21 miles.

Funding

The project is funded through the City's Landslide Hazard Mitigation Program and managed by SDOT's Street Use division.

Materials

June 2024: Public Presentation

June 2024: Final Plans

May 2024: Construction Notice

Transportation

Adiam Emery, Interim Director
Address: 700 5th Ave, Suite 3800, Seattle, WA, 98104
Mailing Address: PO Box 34996, Seattle, WA, 98124-4996
Phone: (206) 684-7623
684-Road@seattle.gov

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The Seattle Department of Transportation (SDOT) is on a mission to deliver a transportation system that provides safe and affordable access to places and opportunities for everyone as we work to achieve our vision of Seattle as a thriving, equitable community powered by dependable transportation.