SR 520 closed overnight Sept. 5; plan ahead for consecutive weekend closures of I-5 off-ramp at Mercer Street

There is a horizontal green band that reads Rest of the West News. Above it is the letters W S D O T. An oval on the right reads state route 520.

In this update:


SR 520’s new eastbound #TwinBridge now open!

On Monday we opened all lanes of SR 520’s new eastbound “twin” bridge between Montlake and the floating bridge on Lake Washington.

In December 2017, we opened what was then a new, westbound-only bridge (pictured at right in photo below) across Union Bay. Then, starting in February 2019, eastbound drivers began sharing that bridge in a two-way configuration. We did that so we could remove the old, structurally vulnerable SR 520 bridge between the floating bridge and Montlake, and then build a stronger, seismically resilient bridge over Union Bay for eastbound traffic.

Aerial view looking northwest at parallel “twin” bridges on SR 520 approaching Seattle's Montlake neighborhood.

Aerial view looking northwest at parallel “twin” bridges on SR 520 approaching Seattle's Montlake neighborhood. The eastbound bridge is pictured on the left.

Photo of twins wearing matching blue sweatshirts and black pants posing for tik tok video

To celebrate the new twin bridge, we recruited a friend (or two) to help us make a TikTok video about it!

The new three-lane span, with a dedicated transit/HOV lane, is the latest milestone for the SR 520 Montlake Project as we get closer to project completion.

Be sure to also check our real-time construction cameras to see the progress.


SR 520 fully closed overnight across Lake Washington on Sept. 5

Crews will close both directions of SR 520 between Montlake Boulevard in Seattle and 92nd Avenue Northeast in Clyde Hill overnight beginning at 11 p.m. Tuesday, Sept. 5 until 5 a.m. Wednesday, Sept. 6. The SR 520 Trail will also be closed.


Coming soon: Four consecutive weekend closures of southbound I-5 off-ramp to Mercer Street

After the Labor Day holiday, drivers heading to Seattle’s South Lake Union neighborhoods will need to prepare for four weekend closures of the southbound I-5 off-ramp to Mercer Street.

All the closures, listed below, will begin at 9 p.m. Friday and continue until 4 a.m. Monday. Some of the closures will be weather dependent and we’ll let you know each week the status of the next upcoming closure.

  • Sept. 8-11
  • Sept. 15-18
  • Sept. 22-25
  • Sept. 29 – Oct. 2
Photo shows a map of SB I-5 and express lanes off-ramp to mercer street closed in red with I-5 symbol

Crews will spend the weekends paving and working on new retaining walls. During the Aug. 25-28 closure, crews were able to make great progress paving the Mercer Street on-ramp to northbound I-5.

Photo shows Mercer St ramp and signage above I-5 with cars in background

A reminder that with these weekend closures, the I-5 Express Lanes exit to Mercer Street also will close. Drivers who want to access South Lake Union or nearby areas should either stay on southbound I-5 and exit at Stewart Street or consider alternate routes.


Sign up for the September online monthly meeting

We’re holding our next Montlake Project monthly meeting virtually at 12:30 p.m. Wednesday, Sept. 13. Join us to learn about current and upcoming construction activities, including planned street and highway closures. Register below to attend and participate in a Q&A.

Date/Time: Wednesday, Sept. 13 at 12:30 p.m.

Register: https://bit.ly/520_Sept_13_Monthly_Meeting


Construction Corner roundup

  • Ongoing: Montlake Boulevard eastbound on-ramp closed weeknights
  • Sept. 5: SR 520 closed across Lake Washington overnight; SR 520 Trail also closed
  • September: Southbound I-5 off-ramp & express lanes exit to Mercer Street closed weekends

Check out the SR 520 Construction Corner map for the most up-to-date information on closures and construction impacts.


How to reach us and stay informed about SR 520 construction:

  • Call or text our project-specific construction hotlines with pressing questions or concerns related to the:
    • Montlake Project: 206-775-8885
    • SR 520/I-5 Connection Project: 206-316-2559 
  • Call the SR 520 Program information line (206-200-9484, M-F 8 a.m. - 5 p.m.) with general SR 520 inquiries.
  • Email SR 520 staff with your questions about the project or construction activities.
  • Visit the SR 520 Construction Corner for the most up-to-date information on closures and construction impacts.
  • Visit the SR 520 Program website to find general information about the project.
  • Email Regina Glenn, WSDOT Megaprograms Diversity and Inclusion Manager, for more information about contracting opportunities.
  • Follow us on Twitter @wsdot_520 to get key news and updates about the SR 520 program.
  • View current Montlake Project construction photos, taken continuously day and night, by mounted construction cameras
  • Share the ROTW listserv with your friends and neighbors

If you have difficulty understanding English, you may request language assistance services free of charge by calling (360) 705-7090 or emailing TitleVI@WSDOT.WA.GOV.

Español - Spanish
servicios de traducción
Aviso a personas con dominio limitado del idioma inglés: Si usted tiene alguna dificultad en
entender el idioma inglés, puede, sin costo alguno, solicitar asistencia lingüística con respecto a
esta información llamando al (360) 705-7090, o envíe un mensaje de correo electrónico a:
TitleVI@WSDOT.WA.GOV.

中文 - Chinese
翻译服务
如果您难以理解英文,则请致电:(360) 705-7090,或给我们发送电子邮件:
TitleVI@WSDOT.WA.GOV,请求获取免费语言援助服务。

tiếng Việt-Vietnamese
các dịch vụ dịch thuật
Nếu quý vị không hiểu tiếng Anh, quý vị có thể yêu cầu dịch vụ trợ giúp ngôn ngữ, miễn phí, bằng
cách gọi số (360) 705-7090 hoặc email cho chúng tôi tại: TitleVI@WSDOT.WA.GOV.

한국어 - Korean
번역 서비스
영어로 소통하는 것이 불편하시다면, (360) 705-7090으로 전화하시거나 다음 이메일로
연락하셔서 무료 언어 지원 서비스를 요청하실 수 있습니다: TitleVI@WSDOT.WA.GOV.

Af-soomaaliga - Somali
Adeegyada Turjumaada
Haddii ay kugu adag tahay inaad fahamtid Ingiriisida, waxaad, bilaash, ku codsan kartaa
adeegyada caawimada luuqada adoo wacaaya (360) 705-7090 ama iimayl noogu soo dir:
TitleVI@WSDOT.WA.GOV.

русский - Russian
Услуги перевода
Если вам трудно понимать английский язык, вы можете запросить бесплатные языковые
услуги, позвонив по телефону (360) 705-7090 или написав нам на электронную почту:
TitleVI@WSDOT.WA.GOV.

ِيَّة
Arabic - اَلْعَ َرب
خدمات الترجمة
إذا كنت تجد صعوبة في فھم اللغة الإنجلیزیة، فیمكنك مجان ا طلب خدمات المساعدة اللغویة عن طریق الاتصال بالرقم
.TitleVI@WSDOT.WA.GOV: الإلكتروني البرید عبر مراسلتنا أو)، 360) 705-7090


Thank you for signing up for the SR 520 Rest of the West news email updates. WSDOT will keep the community informed of current and planned construction activities through these updates and the other tools listed above.