15th Ave S and S Columbian Way Intersection Revision

Updated: October 17, 2018

What’s happening now?

On Wednesday, August 22nd, we hosted a public meeting at the Jefferson Park Community Center to discuss revisions we made to the 15th and Columbian project design. Over 60 people showed up to the meeting and had a chance to comment on the project. We shared the comments with City leadership and are working on the next steps for the project. We plan to host another meeting to discuss whatever decision is made about the project. To view the comments, please click here.

15th Ave S and Columbian Way S intersection alternatives

Over the last year and half, we have been engaging with neighbors and businesses to develop a design that fits the needs of everyone.

Based on feedback we have heard from some community members, we developed a new proposed concept for the 15th and Columbian intersection. This new concept retains the traffic signal at S Oregon St. See graphics below that outline the alternatives we considered for the intersection along with data showing how long it would take a person in a car to get through the intersection. These concepts were presented at the 8/22 public meeting.

Current intersection design

Please click here to enlarge

Alternatives B and C diagrams

Please click here to enlarge

Existing ConditionAM PeakPM Peak
Time through arterial sector 25 25
A: Original designAM PeakPM Peak
Time through arterial sector 30 28
Difference in time +5 +3
B (Concept Considered): Keep N crosswalk and keep signalAM PeakPM Peak
Time through arterial sector Greater than 100 72
Difference in time N/A N/A
C (Proposed Concept): Remove N crosswalk and keep signalAM PeakPM Peak
Delay in seconds 36 36
Difference in time +11 +11

Other improvements

We also heard from the community that we should focus on the Mercer Middle School priorities, so we did. As soon as this fall, we will be creating a space along 16th Ave S for a designated student pick up and drop off zone.

To help facilitate the additional traffic on 16th Ave S, we will also be installing a full traffic sign at 15th Ave S and S Dakota St. The full signal was also a request we heard from some community members. The full signal at S Dakota St will create an alternative access point to 15th Ave S.

Thank you again for the time and energy you’ve devoted to this process.

Email us your questions or comments: NSF15andColumbian@seattle.gov

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Site Photos

Site Photo
15th Ave S and S Columbian Way intersection before improvements

Project Description

The Seattle Department of Transportation (SDOT) will make improvements to the 15th Ave S and S Columbian Way Intersection to improve safety for people walking and biking around this intersection in Beacon Hill. Currently, people walking and biking, including Mercer Middle School students, must contend with confusing routes for getting from one side of the street to the other and may have to cross streets three times. The intersection can also be confusing for people driving. In 2016, the 15th Ave S and Columbian Way Intersection Improvements project was one of 12 selected by the Levy to Move Seattle Oversight Committee to be funded through the SDOT’s Neighborhood Street Fund (NSF) program. The NSF program funds projects requested by the community.

Project Elements

  • New curb bulbs
  • Crossing and signal consolidation
  • Turn restrictions at 15th Ave S and S Oregon St; motorists will only be able to make right turns into and out of S Oregon St from 15th Ave S
  • A new public space at the northwest and southwest corners of the redesigned intersection
  • Improved connections to bicycle facilities to the north, west and south
  • Replace on-street parking
  • Consider adding an all-way stop at S Snoqualmie St

Related projects

There are a number of improvements being made in this area, including paving a section of S Columbian Way in 2018, considering if we can improve the bike connection along S Columbian Way between this intersection and Beacon Ave S, where the paving project is happening, and creating a family friendly connection (neighborhood greenway) between Beacon Hill and Mt. Baker neighborhoods. We'll coordinate outreach efforts so that you get the full story and don't have to talk to multiple people at different times.

Design Concept


Proposed Plaza Concept

Proposed Plaza Concept

Project Benefits

When complete, this project will:

  • Increase safety at the intersection for students and other people walking and biking
  • Reduce confusion for drivers at the intersection
  • Improve transit stops
  • Provide public space for the community to enjoy
  • Allow for protected turns at S Snoqualmie St and 15th Ave S

Project Schedule


NSF applications and projects selection


Project design


Proejct construction


NSF applications and projects selection (new cycle)

Project Library

Fact Sheet - October 2017
May Drop-in Session Event Summary
May 2 Drop-in Session NSF Exhibit Boards

May 2 Drop-in Session S Columbian Way Protected Bike Lane Exhibit Boards
May 2 Drop-in Session Door Hanger Announcement
Mercer Middle School PTSA Presentation
Beacon Hill Council Presentation, April 4, 2017
Fact Sheet – March 2017
SDOT Project Review Document
af Soomaali
Tiếng Việt
3 year summary of collisions near 15th Ave S and S Columbian Way

Project Funding

Funding comes from the 2015 voter-approved, nine-year Levy to Move Seattle, which will improve safety for all travelers, maintain streets and bridges, and invest in reliable, affordable travel options for a growing city. The levy includes $24 million to continue the Neighborhood Street Fund program over the nine years.

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

Public Outreach and Engagement

We are committed to keeping you informed throughout the life of the project. You can expect outreach to students and parents at Mercer Middle School, intersection travelers, and adjacent project neighbors and businesses in 2017. Later this year, when the design is further along, we will likely hold a public meeting to present the detailed intersection design and seek your feedback.

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To request information in another format:

We are designing and building a transportation project proposed by your neighbors to make it safer for people walking and biking and to strengthen community. To learn more about the project or request translations call (206) 451-8191.

Estamos disenando y construyendo un proyecto de transporte propuesto por nuestros vecinos a fin de que sea mas seguro para que las personas caminen y monten bicicleta y asimismo fortalecer a la comunidad. Para obtener mayor informacion acerca del proyecto o para solicitar transporte llamar a: (206) 451-8191.

Chúng tôi đang thiết kế và xây dựng một dự án giao thông đề xuất bởi chính những người hàng xóm của quý vị nhằm làm cho việc đi bộ và đi xe đạp trở nên an toàn hơn và cộng đồng vững mạnh hơn. Để tìm hiểu thêm về dự án hoặc yêu cầu các bản dịch, hãy gọi (206) 451-8191.

我們正在設計並建造一個由您的鄰居提議的交通計畫,這個計畫旨在改善人們的步行及騎車安全,並強化社區。 如需進一步瞭解這項計畫,或是申請翻譯服務,請撥打(206) 451-8191.

我们正在设计并建造一个由您的邻居提议的交通计划,这个计划旨在改善人们的步行及骑车安全,并强化社区。 如需进一步了解这项计划,或是申请翻译服务,请拨打 (206) 451-8191.

በእግራቸው ለሚጓዙ እና ብስክሌት ለሚጋልቡ ሰዎች ይበልጥ ለደኅንነታቸው አስተማማኝ እንዲሆን በእርስዎ ጎረቤቶች በቀረበ ንድፈ ሐሳብ ላይ በመመርኮዝ የትራንስፖርት አገልግሎት ፕሮጄክትን በመንደፍ እና በማዘጋጀት ላይ ነን። ስለ ፕሮጄክቱ የበለጠ ለማወቅ ወይም ትርጉም አገልግሎት ለማግኘት ጥያቄ ለማቅረብ ወደዚህ ይደውሉ :(206) 451-8191.

በእግሮም ንዝጓዓዙን ብሽክልታ ንዝጥቀሙን ሰባት ውሑስንኦም ንምሕላውን እቲ ማሕበረሰብ ንምጥንኻርን ብጎረባብትኻ ዝተተለመ ናይ መጓዓዝያ ፕሮጀክት ዲዛይን ነውጽን ንሃንጽን ኣሎና፡፡ ብዛዕባ እቲ ፕሮጀክት ዝበለጸ ሓበሬታ ንምርካብ ወይ ናይ ናብ መጓዝያ ንምድዋል ሓገዝ ንምርካብ (206) 451-8191.

Nuti Pirojektii geejjibaa ollaawwan keessaniin gaafataman kan wixineessinuu fi ijaarruuf, namoota deemaniifi isaan bishikilitii ofaniif daandii nagaa taasisuufi hawaasichas cimsuudhaaf. Waa’ee pirojektichaa caalaa baruuf ykn geejjiba gaafachuuf nuuf bilbilaa (206) 451-8191.

Waxaynu nakhshadaynaynaa oona dhisaynaa mashruuc gaadiid ay soo jeediyeen dadka deriskaaga ah si aynu ugaga dhigno mid ammaan ah dadka soconaya iyo kuwa baaskiilada wata iyo si aynu u xoojino jaaliyada. Si aad u oggaatid inbaddan oo ku saabsan mashruuca ama u codsatid waxyaabo turjuban soo wac (206) 451-8191.

Kami ay nagdidisenyo at nagtatayo ng isang proyekto para sa transportasyon na namungkahi ng inyong mga kapitbahay para gawing mas ligtas para sa mga taong naglalakad at nagbibisikleta at para mapatatag ang komunidad. Upang higit pang matutunan ang tungkol sa proyekto o humiling ng mga pagsasalin-wika, tumawag sa (206) 451-8191.


Greg Spotts, Director
Address: 700 5th Ave, Suite 3800, Seattle, WA, 98104
Mailing Address: PO Box 34996, Seattle, WA, 98124-4996
Phone: (206) 684-7623

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The Seattle Department of Transportation (SDOT) is on a mission to deliver a transportation system that provides safe and affordable access to places and opportunities for everyone as we work to achieve our vision of Seattle as a thriving, equitable community powered by dependable transportation.