Project Complete
This project was completed in 2024.
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 Area
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