Rainier Ave S Landslide Mitigation Project


The City of Seattle Landslide Mitigation Program recently received funding to address some of the long-standing issue of surface slides from the adjacent slope as well as significant overgrowth covering and obstructing the use of the adjacent sidewalk along segments of Rainier Ave S from S Carver St to the south City limits near S Ryan St.

Due to the limited amount of funds available for this project, the project team prioritized the problem areas. In early 2016, Seattle Department of Transportation (SDOT) completed the installation of a 60’ segment of retaining wall. In fall 2016, SDOT crews cleared and recovered existing sidewalk so that the sidewalk could be used by pedestrians. This work also assisted in the final site evaluation to prioritize the remaining available funds for this project, which includes four sites proposed for new retaining wall construction.

Project map
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The project will meet SDOT's goal of road and sidewalk maintenance, increasing the life of the streets and reducing impacts to pedestrians and traffic.

SDOT maintains almost 600 retaining walls, most protecting public streets. The average height is six 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: Late 2017

Anticipated Construction Impacts

Information on construction impacts will be available closer to the start of construction in late 2017. General construction impacts will include: noise, dust, vibration, lane restrictions, and potential detours (vehicular, bike, pedestrian).


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