In this update:

• Talk with the project team tomorrow at Roanoke Park
• Next phase of lid construction begins June 15 near Roanoke Park
• Next online construction meeting is June 18
• Construction Corner roundup

Talk with the project team tomorrow at Roanoke Park

Stop by our table at Roanoke Park tomorrow to learn about current and upcoming construction, ask questions and get the latest project updates.

Event details

• When: 2-4 p.m. on Friday, June 12
• Where: Roanoke Park, 950 East Roanoke Street, Seattle, WA 98102

If you can’t make it to this upcoming event, don’t worry! We’ll have more in-person events later this summer and fall.

Project staff answer questions at a previous community event

Next phase of lid construction begins June 15 near Roanoke Park

Starting as soon as next week, crews will begin building another lid foundation (like the one recently built in the median on SR 520) in the area between East Roanoke Street and SR 520.

Moving equipment into the work zone

Crews will kick off this work by moving equipment into the work zone behind our acoustifence on East Roanoke Street. We will close Delmar Drive East between East Roanoke Street and Interlaken Boulevard overnight from 10 p.m. to 6 a.m. on Monday night, June 15, through Friday morning, June 19, to bring in pieces of equipment and assemble a crane. A uniformed police officer will be on-site to guide traffic and pedestrians around the work zone during this closure.

The completed section of foundation sits between 10th Avenue East and Delmar Drive East, between the eastbound and westbound lanes of SR 520 (May 2026)

Installing drilled shafts

After crews move in and build the equipment, they will begin installing drilled shafts that will eventually support the future Roanoke lid. Instead of using a vibratory or impact hammer to install the steel casings for each drilled shaft, they will use an oscillator to rotate the steel casings into the ground. Crews will plan to work west to east (from 10th Avenue East to Delmar Drive East).

Nearby neighbors will experience noise and vibration during daytime construction. This phase of lid construction is expected to continue through the summer.

Construction overview:

• From Monday night, June 15, to the morning of Friday, June 19, crews will work at night (10 p.m. to 6 a.m.) on Delmar Drive East and East Roanoke Street in the Roanoke Park neighborhood to deliver and assemble drilling equipment, cranes and heavy machinery into the work zone.
• During daytime hours, large trucks will need to access the work zone from Delmar Drive East to deliver equipment and steel reinforcement cages. Flaggers will be on site to briefly pause traffic as needed and safely guide trucks into the work zone.
• Crews will use an oscillator to rotate a temporary steel casing into the ground while removing soil.
• Once crews complete excavation, cranes will lift and place the rebar cage into the shaft.
• Crews will then pump concrete into the drilled shaft. After the concrete is in place, they will remove the temporary casing using the oscillator.

What to expect during drilled shaft work:

• Drilled shaft installation between East Roanoke Street and SR 520.
• Typical work hours: 7 a.m. to 10 p.m. weekdays (excluding holidays) and 9 a.m. to 10 p.m. on limited weekends.
• Increased noise and vibration during this work from trucks and equipment.
• Flaggers on Delmar Drive East.

Hearing noise or experiencing vibration? Call our 24/7 hotline.

We monitor noise and vibration in real-time around the project area. If you feel like you’re experiencing excessive noise or vibration from this work, please call the 24-hour hotline as soon as possible at 206-319-4520 so we can investigate in real time. You can also email us at sr520bridge@wsdot.wa.gov (monitored Monday through Friday, 8 a.m. to 5 p.m.).

Next online construction meeting is June 18

Join us for our next monthly construction meeting held virtually at noon on Thursday, June 18. 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.

• Date/Time: Thursday, June 18, at noon
• Link to register: https://bit.ly/portagebay-meeting

Missed the last Portage Bay Project monthly meeting? You can view the presentation online (PDF, 3.7 MB) or watch the meeting recording on YouTube.

Construction Corner roundup

• Feb. 18 - June 18: Boyer Avenue East between East Roanoke Street and Everett Avenue East reduced to single lane weekdays
• June 15-18: Delmar Drive East between 11th Avenue East and Interlaken Boulevard closed nightly
• June 22: Eastbound SR 520 off-ramp to Montlake Boulevard closed overnight
• Updated weekly: Vibratory casing installation in Portage Bay schedule

Check our Construction Corner map for the most up-to-date information on SR 520 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:
  • Portage Bay Project: 206-319-4520 (24-hour hotline)
  • Montlake Project: 206-200-9484, M-F 8 a.m. - 5 p.m.
• 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/X and BlueSky ‪to get key news and updates about the SR 520 program.
• Share the ROTW listserv with your friends and neighbors.
• 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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