Rainier Ave S Landslide Mitigation Project

Updated: September 9, 2020

What's happening now?

Project Timeline Construction Wrap-up
The project is currently in suspension until the landscape plantings arrive. We do not anticipate any further activity onsite until the end of September or early October to complete the landscaping and close out the project.
  • All retaining walls are complete.
  • All planned sidewalk areas are complete.
  • Grass has been replanted behind the walls and along the green strips.
  • Restoration of channelization has been completed and all traffic controls have been removed.
Hydro seed placed on exposed soil areas
Hydro seed was added to exposed soil areas
Sidewalk complete at Wall 4

Sidewalk complete at Wall 4

Rockery wall at S Ryan Street repaired

Rockery wall at S Ryan Street was repaired

Rainier Ave S Landslide Mitigation Retaining Wall Map


We're working to address the long-standing surface slides as well as significant overgrowth obstructing the sidewalk along segments of Rainier Ave S from S Carver St to the south City limits near S Ryan St.

Because of limited funds, the project team prioritized the problem areas. In 2016, we installed a 60’ segment of retaining wall and cleared overgrowth from the existing sidewalk to open it up to people walking.

In early 2020, we plan to install the retaining walls outlined within the map below. See our construction mailer for more info. 


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.


Design: Winter 2016 – Fall 2017
Construction: Installed priority retaining wall and cleared sidewalk in 2016; Remaining retaining wall installation in 2020

Anticipated Construction Impacts

General construction impacts will include noise, dust, vibration, lane restrictions, and potential detours for people walking, biking, and driving.


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


Construction mailer (December 2019) 

Project map (2019)

Project map (work completed in 2016)