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23rd Avenue Corridor Improvements Project

Updated March 22, 2017

Phase 1 Construction | Current Schedule | Background | Outreach | Materials | Cost | Contact Us

Translated project materials available below

  • 中文 /Chinese
  • Español/Spanish
  • TiếngViệt /Vietnamese
  • 한국의 / Korean
  • አማርኛ / Amharic
  • ትግርኛ /Tigrinya
  • Oromiffa/Oromo
  • Somali/Somali


Upcoming construction activities

  • 23rd Ave is open to northbound and southbound traffic
  • Crews will work to finish minor close-out activities for the 23rd Ave project from S Jackson St to E John St through this spring; northbound and southbound traffic on 23rd Ave will be maintained, but neighbors can expect temporary lane shifts during the duration of this work
    • Crews restored two-way traffic on 23rd Ave from E Union St to E John St on Tuesday, February 28
    • Work remaining includes: activating real-time information system (RTIS) signs at bus stops along 23rd Ave, installing street and parking signs, grouting pole foundations, final landscaping, and additional punch list items
  • This spring, we will seek community feedback on Phase 1 construction through door-to-door outreach in the Phase 1 area, an online survey, and a drop-in session; the goal of the community evaluation will be to incorporate lessons-learned from Phase 1 into the design and construction approach for Phase 2. Please stay tuned for more information about this effort this spring!
  • The Office of Economic Development is continuing to work with businesses to address their needs. If you have questions, please email or call Michael Wells at or 206-684-8612.

Project information line: 206-727-8857


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23rd reopened to two-way traffic, final close-out work  

Crews have continued making good progress rebuilding 23rd Ave since construction began in June 2015. On February 28, 2017, crews reopened 23rd Ave to two-way traffic, which marks the completion of the majority of construction work for Phase 1. Crews will work to finish minor close-out activities through spring 2017.
The remaining work includes activating real-time information system (RTIS) signs at bus stops, installing street and parking signs, grouting pole foundations, final landscaping, and other punch list activities. Crews will maintain northbound and southbound traffic on 23rd Ave for the duration of this work, but neighbors can expect temporary lane shifts between S Jackson St and E John St.

Construction contact information

If you have questions during construction, please contact us via phone or email:


The 23rd Avenue Corridor Improvement project includes three phases:

Phase 1: S Jackson St to E John St: June 2015 – spring 2017; major construction activities completed, minor close-out activities in progress

Phase 2: S Jackson St to Rainier Ave S – We will share the design and schedule for Phase 2 in late spring / early summer 2017

Phase 3: E Roanoke St to E John St – Scope and schedule to be determined


For a good introduction to the project, be sure to check out our overview video.

The corridor

23rd Ave is an essential arterial that connects a variety of users to businesses, educational institutions and residences in the Central District and beyond. Approximately 13,400-20,000 vehicles use 23rd Ave each day. This area also serves high volumes of pedestrians, bike riders, and transit users (approximately 6,000 daily transit riders).

Why construct improvements on the 23rd Ave corridor? 

Before the start of construction, the 23rd Ave corridor was in poor condition, including:

  • Many collisions (more than 900 reported in five years)
  • Poor road conditions (e.g. potholes, cracked pavement)
  • Narrow lanes
  • Back-ups created by left-turning vehicles
  • Narrow and uneven sidewalks
  • Inadequate buffers between vehicles and pedestrians

Improving safety and mobility in your neighborhood

In June 2015, the Seattle Department of Transportation (SDOT) began construction on 23rd Avenue between S Jackson St and E John St. This is the first phase of a project to improve safety and mobility for people who drive, walk, bike and take transit in the area.

Project improvements vary by phase and include:

  • Modifying 23rd Ave from a four-lane street to a three-lane street - one lane in each direction with a center left-turn lane (key intersections will stay four lanes)
  • New pavement
  • Widening sidewalks to at least five feet and repairing broken and buckling sidewalks
  • Installing new streetlights
  • Upgrading traffic signals to give transit priority at key locations
  • Consolidating bus stops to improve transit speed
  • Replacing a 100-year-old water main that runs underneath 23rd Ave
  • Installing public art near 23rd Ave and E Union St
  • Implementing a greenway adjacent to 23rd Ave, to create a quieter, safer route for people to bike and walk

The new roadway –opportunity for a safer 23rd Ave

The new corridor will have wider lanes – one in each direction – plus a 10-foot-wide center turn lane. The turn lane will allow left-turning vehicles to make a safe left turn, while still allowing thru-traffic to continue through an intersection and down the street.

On streets with 25,000 vehicles per day or fewer, such as 23rd Ave, changing the street design from four lanes to three can increase safety by reducing collisions, reducing speeding, allowing vehicles to turn without blocking traffic, managing drivers cutting in and out of lanes, creating space for wider sidewalks, making streets easier to cross and making it easier for freight and transit to travel. At most bus stops, the road will flare to approximately 18 feet, where buses can pull to the side and vehicles can pass the stopped bus in the travel lane. The City is also working with King County Metro to determine the benefits of electrifying the Route 48 line. The results from the study can be found in the Project Materials section below.

cross section

Public Outreach

SDOT is committed to engaging with the community and responding to community needs in the project area. Please stay tuned for more information about future public engagement opportunities, and contact us if you would like to request a community briefing. 

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Email address:

Project Materials

Current materials


Previous materials

Previous translated materials

Project Cost

SDOT has a total of $43 million in funding through a combination of local, state and federal sources. Phase 1 is estimated to cost approximately $31 million and is fully funded. SDOT has sufficient funding for Phase 2 and 3 design; however, additional funding is needed for Phase 2 and 3 construction.

Questions or Comments?


Call the project information line: 206-727-8857

Maribel Cruz
Project Communications Lead

Therese Casper
Project Manager

To request information in another format:

If you need this information translated, please call (206) 727-8857.

Si necesita traducir esta información al español, llame al (206) 727-8857.

如果您需要此信息翻譯成中文 請致電 (206) 727-8857.

Kung kailangan mo ang impormasyon na ito na nakasalin sa Tagalog mangyari lamang na
tumawag sa (206) 727-8857.

Nếu quý vị cần thông tin này chuyển ngữ sang tiếng Việt xin gọi (206) 727-8857.

የዚህን መረጃ ትርጉም ከፈለጉ፣ በዚህ ስልክ ቁጥር ይደውሉ፡ (206) 727-8857.

ናይዚ ሓበሬታ ትርጉም እንተደሊኹም፣ በዚ ቁጽሪ ስልኪ ይድውሉ፡ (206) 727-8857.

Odeeffannoon kun akka siif (206) 727-8857.

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