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Natural Drainage

Delridge-Highland Park Neighborhood Greenway

Creating a network of family-friendly residential streets

Last updated: January 20, 2016

Project Update

With the onset of the rainy season, our contractor may need to shift its schedule to do work that can be done when it's raining, such as demolition and site preparation. Crews will primarily take advantage of the dry days to pour concrete and asphalt and to install pavement markings.

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 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

Construction continues at 21st Ave SW between 22nd Ave SW and SW Dawson St

Beginning Wednesday, January 20, crews return to the west side of 21st Ave SW between 22nd Ave SW and SW Dawson St to complete construction of a new sidewalk in this area. To complete this work, 21st Ave SW will need to be reduced to one lane. A flagger will be present on both ends of the work zone to maintain two-way traffic. This work is weather dependent and will be rescheduled if necessary. 

Drainage improvements on 21st Ave SW, just south of where 22nd Ave SW merges with 21st Ave SW, are complete. This work included installing a storm drain on the east side of 21st Ave SW and repairing a storm drain on the west side of the street. Crews will return to pour asphalt around the drains and landing areas over the next several weeks.

Construction at 17th Ave SW cul-de-sac

Construction to build a pedestrian pathway connecting areas north and south of the cul-de-sac on 17th Ave SW between SW Myrtle and SW Webster streets has been delayed and will begin as early as February. In addition to the new concrete pathway, improvements will include a new permanent retaining curb, new curb ramps at the north and south entrances of the pedestrian pathway, and pavement markings.

When construction begins, parking will be limited and pedestrian detours will be in place around the work area. This work is expected to take up to two weeks to complete.

View the construction notice here

Construction at intersection of 15th Ave SW and SW Holden St

Southbound turns from SW Holden St to 15th Ave SW will be closed until Friday, January 22. Crews are finishing installation of curb ramps and sidewalk. The pedestrian crossing signal will be activated in February 2016. Those needing local access to 15th Ave SW are encouraged to use SW Kenyon St to the south. VClick here to

View the construction notice here

Construction at intersection of 16th Ave SW and SW Webster St

Crews are continuing with the installation of curb ramps at 16th Ave SW and SW Webster St. Weather permitting, work is expected to be complete in February 2016.

Click here for construction notice.

View final project plans, including speed hump locations here
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 form 7 AM to 6 PM
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

Neighborhood greenways are safer, calmer residential streets for you, your family, neighbors and customers. On streets with low car volumes and speeds, a greenway can:

  • Improve safety
  • Help people cross busy streets
  • Discourage cut-thru traffic
  • Protect the residential character of our neighborhoods
  • Keep vehicle speeds low
  • Get people to where they want to go (e.g., parks, schools, shops and restaurants)

Neighborhood greenways are not car-free zones; they do not add bike lanes; and there are minimal, if any, on-street parking impacts. Learn more about greenways here.



Project Description

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.

SDOT is working with Seattle Public Utilities (SPU) to design curb extensions with natural drainage systems along 17th Avenue SW, between SW Henderson Street and SW Kenyon Street. To learn more about SPU's Delridge Natural Drainage Systems project, check out their webpage or contact Jason Sharpley , SPU Project Manager, at or call (206) 615-0030.

Public Outreach

In 2013, the City conducted a survey and held two public meetings to identify the most promising route and safety improvements for a neighborhood greenway in the Delridge/Highland Park community. We received valuable feedback on traffic safety concerns, destinations where people want to walk and bike to, as well as known drainage and sewer backup problems. After analyzing data and reviewing public input, the most-promising greenway route was determined to be 17th Avenue SW from Roxbury to SW Kenyon or Holden Streets and 21st Avenue SW on the north end.

Project outreach has included:

  • Neighborhood survey responses (we received more than 280)
  • July 9, 2013 public meeting (where more than 80 people participated)
  • November 19, 2013 public meeting
  • Door-to-door flyering to affected properties
  • Meetings with community groups

Staff also walked and biked around your neighborhood to review different routes and observe locations and grades. Other information considered included traffic volume, speed, and collision data.

Project Funding

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.

Project Schedule

The project reached final design and construction will begin on August 24 and last for approximately six months.

Visit SPU’s Web page to learn more about SPU’s schedule to construct natural drainage infrastructure on 17th Avenue SW in Delridge.

Past Outreach and Materials

Current materials

  • November 2013 open house materials
  • Project Contacts


    Project Outreach Team

    (206) 684-4747

    CJ Holt
    Project Manager
    (206) 233-1556

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