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Delridge-Highland Park Neighborhood Greenway Update

The Greenway will run north-south, connecting White Center to the West Seattle Bridge trail. The greenway route will run generally along 17th Avenue SW in the south and 21st Avenue SW in the north. For a full description of the improvements we designed for this greenway and the route, please see the attached map. Some of the changes will include:

  • Crossing improvements at arterial intersections including striped crosswalks, curb extensions and flashing beacons
  • Repaving SW Myrtle Street between 17th and 21st Avenue SW
  • Speed humps and all-way stops where need, generally about one per block
  • Way-finding signage and pavement markings throughout
  • Spot pavement repairs to improve roadway user safety


The greenway route was selected based on various factors, including evaluating streets for low car volumes, speeds and collisions, road grade (or steepness), and input we heard from the community.

Construction of the Delridge-Highland Park Neighborhood Greenway is expected to be complete in April 2016. Construction is complete or nearly complete at the following locations:

  • SW Myrtle St between 17th Ave SW and 21st Ave SW (Street paving)
  • 21st Ave SW and SW Andover St (New curbs, curb ramps and crosswalk; see photos below)
  • 21st Ave SW and SW Genesee St (New curbs and curb ramps)
  • 21st Ave SW between 22nd Ave SW and SW Dawson St (New storm drains, guard rail, widened sidewalks, pedestrian crossing beacon, and new and upgraded curb ramps; see photos below)
  • 16th Ave SW and SW Webster St (New curbs and curb ramps)
  • 15th Ave SW and SW Holden St (New curbs and curb ramps)


Completed Greenway Elements:

21st Ave SW and SW Andover St

New and upgraded curb ramps and sidewalk were installed at this location.

New and upgraded curb ramps and sidewalk were installed at this location.

Intersection south of where 21st Ave SW and 22nd Ave SW merge

New curb ramps, sidewalk, crosswalk and a pedestrian crossing beacon were installed at this intersection.

New curb ramps, sidewalk, crosswalk and a pedestrian crossing beacon were installed at this intersection.

Construction update at 17th Ave SW

SDOT planned to construct a pedestrian pathway connecting areas north and south of the cul-de-sac on 17th Ave SW between SW Myrtle and SW Webster streets. However, site excavation in early January revealed hillside erosion and excessive groundwater draining into the soil. Given these findings, SDOT will implement a new design. The redesign includes a stairway that is compliant with the Americans with Disabilities Act (ADA), and will include handrails and a bike channel (or “runnel”).

Construction of the new staircase is expected to begin the week of February 22 and will take approximately one week to complete.

View the construction notice update here

View stairway design here

Construction is nearly complete at 15th Ave SW and SW Holden St

Beginning as soon as Monday, February 22, construction crew will return to install electrical cabinets that will provide power to the pedestrian crossing signal. Installation of curb ramps and sidewalk is complete.

Natural Drainage System

Seattle Public Utilities (SPU) began constructing the natural drainage system (see Project Description below) along 17th Ave SW from SW Cloverdale Street to SW Thistle Street in November 2015.

To stay up to date and to learn more about SPU’s Delridge Natural Drainage Systems project, visit the project webpage or contact Jason Sharpley, Project Manager at (206) 615-0030 or

View final project plans, including speed hump locations, here

SDOT would like to thank the public for its patience while this work is completed. As construction progresses throughout the corridor, you can expect the following:

  • Temporary on-street parking restrictions
  • Short-term single lane closures, where needed
  • Pedestrian and bicyclist detours
  • Noise, dust and vibration typical of construction
  • Weekday work hours from 7 AM to 6 PM


Project design of the neighborhood greenway is locally funded by the nine-year voter-approved Bridging the Gap Levy. This project is part of a $3.8 million budget to design and construct the 2015 Ballard and Delridge-Highland Park Greenways. The natural drainage portion of the project is being funded by SPU.

Want to be added to the project email distribution list? Click here to sign up!

Questions? Contact the project team at or (206) 684-4747