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In this update:
The westbound SR 520 off-ramp to northbound I-5 and East Roanoke Street will close for construction from 10 p.m. to 6 a.m. on select nights between Wednesday, Aug. 19, and Thursday, Sept. 3. Crews will use these nightly closures to install shafts for the future expansion of the Roanoke Trail Crossing Bridge over I-5.
The currently scheduled closure dates are:
- Wednesday, Aug. 19, through Thursday, Aug. 20 (including Thursday night)
- Monday, Aug. 24, through Thursday, Aug. 27 (including Thursday night)
- Saturday, Aug. 29
- Monday, Aug. 31, through Thursday, Sept. 3 (including Thursday night)
As soon as Monday, Aug. 24, crews will resume piledriving in the area between Boyer Avenue East and the work trestle on the south side of SR 520. Crews will install approximately 10 additional piles to help connect the work trestle to Boyer Avenue East. Crews expect this work to occur intermittently through the end of September.
What to expect:
- Impact and vibratory piledriving on land.
- Typical work hours from 7 a.m. to 5 p.m., though crews may also need to work some select nights.
- Increased noise and vibration for neighbors near the work zone during piledriving.
If you have questions about this work or the project, please call our 24-hour hotline at 206-319-4520, or email us at SR520bridge@wsdot.wa.gov.
Crews working to connect the southwest work trestle to Boyer Avenue East.
Crews will close Montlake Boulevard between East Hamlin Street and East Louisa Street from 10 p.m. Friday, Aug. 21, to 6 a.m. Monday, Aug. 24.
Here's a breakdown of what's closed:
- Montlake Boulevard between East Hamlin Street and East Louisa Street
- Montlake Boulevard on-ramps to eastbound and westbound SR 520
- Eastbound SR 520 off-ramp to Montlake Boulevard
- A 300-foot section of East Roanoke Street west of Montlake Boulevard
- Lake Washington Boulevard between Montlake Boulevard and 24th Avenue East
The westbound SR 520 off-ramp to northbound Montlake Boulevard will remain open. Crews will maintain a path for people walking, biking and rolling to cross SR 520 on Montlake Boulevard, with a short detour south of SR 520. See map below.
 During the Aug. 21-24 closure, crews will:
- Install three new mast-arm sign structures on Montlake Boulevard — two northbound and one southbound
- Remove the large sign bridge spanning Montlake Boulevard just south of SR 520
- Mount new signs on the mast-arm structures
- Install a new southbound sign, north of SR 520, on an existing utility pole
This is the last of two weekend closures needed to complete the Montlake sign structures work. The work follows community recommendations developed in 2023 and 2024 to remove and replace the large sign bridge on Montlake Boulevard with smaller signs and structures. Visit our webpage to learn more.
We’re excited to invite you to an open house about the Portage Bay Project! Crews have made a lot of construction progress since our last in-person meeting last summer, and we want to share what’s coming for the rest of 2026 and into 2027.
Open house details
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When: Thursday, Aug. 27, 5-7 p.m. Please note there will be no formal presentation.
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Where: Queen City Yacht Club, 2608 Boyer Ave E, Seattle, WA 98102.
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Transit access: Take King County Metro Route 49 to Roanoke Park and walk or roll to the event.
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Parking: Limited free parking is available on site.
Stop by the open house anytime between 5 and 7 p.m. to learn about upcoming construction activities, including:
- How we're building the new Portage Bay bridges
- Future Roanoke lid construction
- Work on and near Boyer Avenue East
- Traffic shifts on SR 520
- New temporary overpass in Roanoke Park
We’ll have displays highlighting upcoming work, and project staff will be available to answer questions about upcoming traffic shifts, temporary overpass construction, effects on city streets, future lid construction and more.
Can’t attend the in-person open house? No problem. Join one of our monthly online construction meetings and stay tuned for our online open house.
Want to learn more?
Head over to the Construction Corner webpage for project updates. You can also connect with us directly through our 24/7 hotline at 206-319-4520 or via email at SR520bridge@wsdot.wa.gov.
This week, crews continued installing drilled shafts near East Roanoke Street. These drilled shafts will eventually support the future Roanoke lid.
As of this week, we’ve installed 17 out of 18 drilled shafts in this area. We expect to continue this work through mid-August.
Crews continue to build the foundation for the future Roanoke lid.
Join us for our next monthly construction meeting held virtually at noon on Thursday, Aug. 20. At the meeting, you'll hear an overview of construction progress and learn about upcoming construction activities, including local street closures. Register below to attend and email SR520bridge@wsdot.wa.gov with any questions.
Missed the last Portage Bay Project monthly meeting? You can view the presentation online (PDF, 8 MB) or watch the meeting recording on YouTube.
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Aug. 19-20: Delmar Drive East between East Roanoke Street and 11th Avenue East closed nightly
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Aug. 19 – Sept. 3: Westbound SR 520 off-ramp to northbound I-5 and East Roanoke Street closed select nights
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Aug. 21-24: Montlake Boulevard closed between East Hamlin Street and East Louisa Street around-the-clock
Check our Construction Corner map for the most up-to-date information on SR 520 closures and construction impacts.
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Call or text our project-specific construction hotlines with pressing questions or concerns related to the:
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Portage Bay Project: 206-319-4520 (24-hour hotline)
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Montlake Project: 206-200-9484, M-F 8 a.m. - 5 p.m.
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Call the SR 520 Program information line (206-200-9484, M-F 8 a.m. - 5 p.m.) with general SR 520 inquiries.
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Email SR 520 staff with your questions about the project or construction activities.
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Visit the SR 520 Construction Corner for the most up-to-date information on closures and construction impacts.
- Be sure to check out the Document Library for FAQ's and other resources including information for neighbors who believe their homes have been damaged by construction vibration.
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Visit the SR 520 Program website to find general information about the project.
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Email Regina Glenn, WSDOT Megaprograms Diversity and Inclusion Manager, for more information about contracting opportunities.
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Follow us on Twitter/X and BlueSky to get key news and updates about the SR 520 program.
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Share the ROTW listserv with your friends and neighbors.
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View construction photos taken 'round the clock by our four mounted construction cameras.
Note: We combined our two SR 520 Program email lists into one. This newsletter will focus on Portage Bay Project construction and closures while also sharing other SR 520 updates. You can manage your preferences or unsubscribe anytime.
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.
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