15th Ave S Improvements

Updated: July 22, 2021

What’s happening now?

During Construction Project Timeline

Construction updates

Through the month of July and into mid-August, expect crews to work nights and weekends to complete their work as efficiently as possible. Watch out for lane closures and detours for pedestrians, bicyclists, and drivers. Help ensure everyone's safety by following project signs and the instructions of crew members. And crews will do what they can to complete this work as quickly, quietly, and safely as possible.

Crews worked overnight the week of July 5 to pave 15th Ave S between S Angeline St and S Spokane St. Permanent striping for that corridor begin as soon as the week of July 26; there have been temporary lane markings while the new pavement sets.

See the map and descriptions below for other recent and upcoming work.

Summer 2021 Construction Zones along S Spokane St

Pavement grinding

Crews have completed work to grind the pavement along S Spokane St between S Columbian Way and 18th Ave S. Grinding, which prepares the road surface for paving later this summer, was completed during nighttime shifts the week of June 28. 

Intersection work

Crews have completed drainage work, sidewalk and curb improvements, and road repairs where S Spokane St meets S Columbian Way. Now, they are working at the intersection of Beacon Ave S and S Spokane St, where they’ll continue to work through at least early August. To reduce the impacts on traffic flow, some work must be done at night and on weekends. Later in the summer, crews will be completing the same types of work at the intersections where S Spokane St meets 15th Ave S, 16th Ave S, 17th Ave S, Alamo Pl S, and 18th Ave.

Questions about the project?

Email us at 15thAveAAC@seattle.gov or leave us a voicemail at (206) 775-8719.

Project Overview

15th Ave S between S Spokane St and S Angeline St is a two-way arterial serving southeast Seattle. This stretch of road provides an important connection for people traveling between Beacon Hill and Rainier Valley. SDOT wants to ensure that these improvements contribute to a safer space for all travelers and balance the needs of all modes of transportation, so that everyone can get where they need to go safely and conveniently.

We're repaving about 1 mile of 15th Ave S between S Spokane St and S Angeline St and a section of S Spokane St between S Columbian Way and 18th Ave S.

In addition to paving, we're making improvements at the 15th Ave S and S Columbian Way intersection. These improvements include a new pedestrian-friendly peninsula and updated roadway striping. Contrary to earlier plans, we're not building a plaza and the left turn signal at S Oregon St and 15th Ave S will remain. For more details about the improvements at this intersection, please see the maps below.

Interactive Project Map

Our online project map gives you information about the type of improvements being built throughout the project area, plus a high-level schedule, so that you can anticipate construction impacts near your home or business. You can also leave comments and questions for the project team on the map. Check it out!

15th Ave S Improvements Interactive Project Map

Project Map

15th Ave S Improvements Project Map

Intersection Improvements at S Oregon St/15th Ave S/Columbian Way
(Click to enlarge) Details of 15th Ave S and S Columbian Way intersection improvements

The scope of this project includes:

  • New pavement: This will extend the life of the pavement, making the roadway safer and smoother for travel
  • Drainage improvements: Improving drainage in the area will extend the life of the roadway and make the streets safer and smoother to use
  • Slip lane: This project will improve the slip lane (the right-turn-only lane) at 15th Ave S and S Spokane St
  • Upgraded pedestrian push buttons: We'll update push buttons in select locations to meet Americans with Disabilities Act (ADA) standards
  • Upgraded curb ramps: In select locations, we'll update curb ramps to meet ADA standards
  • Improved and updated sidewalks: We'll repave select sidewalks in need of repair
  • Improvements at 15th Ave S and S Columbian Way intersection: We'll install a pedestrian-friendly peninsula, new curb bulbs, and improved connections for bicycles.

Below are images of the project area. The first depicts a crosswalk at the 15th Ave S and S Columbian Way intersection that we'll shorten during this project. The second shows damaged roadway along 15th Ave S that we'll repave.

Photo showing current configuration of pedestrian island at the intersection of 15th Ave S and S Columbian Way.
Current configuration: pedestrian island at the intersection of 15th Ave S and S Columbian Way. 

Image showing roadway damage on 15th Ave S.
Roadway damage on 15th Ave S.

Project Background

Each year, we pave arterial streets in poor condition to make them safer and smoother, and to extend their useful life. We prioritize paving projects based on pavement condition, traffic volume, geographic equity, cost, and opportunities for grants or coordination with other projects in the area. Paving streets also creates opportunities to improve street safety and move people and goods more efficiently in a growing Seattle. Read more about our current paving projects here.

Get involved

Here are some ways to get more information about the project:


This is our anticipated project timeline, but dates are subject to change.

Early 2020
Complete final design

Summer and Fall 2020
Pre-construction coordination with community

January 2021
Begin construction, starting with the intersection of 15th Ave S and S Columbian Way

Late 2021
Complete construction


Levy to Move SeattleFunding comes from the 2015 voter-approved, 9-year Levy to Move Seattle, which provides funding to improve safety for all travelers, maintain streets and bridges, and invest in reliable, affordable travel options for a growing city.

The paving portion of this project is funded by our paving program and by the Federal Highway Administration (FHA) Preservation Grant and is managed by WSDOT.

This project is also receiving funding from SDOT's Safe Routes to School program, which makes it easier and safer for students to walk and bike in Seattle.

Outreach to Date

Fall 2019
Outreach to community to share information and collect input.

February 2020
Preconstruction open house 

October 2020 
Online drop-in session and pre-construction mailer  

January 2021 
Construction kickoff emails and pre-construction mailer  


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