Date: April 21, 2026 to April 30, 2026

Time: 10 p.m. to 6 a.m. nightly (excluding weekends)

Activity details:

Impact type:

Description: Crews will use these closures to prepare for an upcoming traffic shift of the off-ramp scheduled for later this spring. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project.

Traffic: The eastbound SR 520 off-ramp to Montlake Blvd. in Seattle will close nightly for construction beginning at 10 p.m. until 6 a.m. on the dates of April 30, May 4-7, and May 11-14.

All traffic from I-5 entering eastbound SR 520 during these hours will pay the SR 520 Bridge Toll with this ramp closed. Those who do not want to pay the toll or who need to access Montlake Blvd. from I-5 must take alternate routes.

Eastbound SR 520 remains open across Lake Washington.

Date: May 2, 2026 to May 2, 2026

Time: 10 a.m. to 4 p.m.

Activity details:

Impact type:

Description: To accommodate the 2026 Opening Day of Boating Season, the westbound SR 520 off-ramp to Montlake and a single lane on the eastbound SR 520 off-ramp to Montlake will temporarily close.

Traffic: The westbound SR 520 off-ramp to Montlake Boulevard, and the left lane of the eastbound SR 520 off-ramp to Montlake Blvd. will close between 10 a.m. and 4 p.m. on Saturday, May 2, due to the 2026 Opening Day of Boating Season.

What to expect: During this time, westbound SR 520 travelers coming from across Lake Washington will not be able to exit at Montlake Boulevard and will need to either continue westbound toward the off-ramps to I-5 or East Roanoke Street or take the Lake Washington Boulevard exit.

The eastbound SR 520 off-ramp to Montlake Blvd. will remain open, however travelers will not be able to turn left (northbound) towards the Montlake Bridge and will either need to travel south on Montlake Boulevard or continue east onto Lake Washington Boulevard.

Please note the Montlake Bridge will also be closed during these hours.

SR 520 remains open across Lake Washington for both directions.

Date: May 6, 2026 to May 7, 2026

Time: 10 p.m. Wednesday to 6 a.m. Thursday

Activity details:

Impact type:

Description: Crews will use this closure to do utility work. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project.

Traffic: The southbound I-5 off-ramp to eastbound SR 520 will close for construction beginning at 10 p.m. on Wednesday, May 6, until 6 a.m. on Thursday, May 7.

During this time, all southbound I-5 traffic wanting to access eastbound SR 520 will need to use alternate routes. Eastbound SR 520 remains open across Lake Washington.

Date: May 8, 2026 to May 11, 2026

Time: 11 p.m. Friday to 5 a.m. Monday

Activity details:

Impact type:

Description: Crews will use this closure to finalize a traffic shift of the northbound I-5 ramp to eastbound SR 520 and create a new work zone. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project. Learn more about this upcoming traffic shift on our latest blog post.

Traffic: Eastbound SR 520 and all associated on- and off-ramps between I-5 and Montlake Blvd. will close for construction beginning at 11 p.m. on Friday, May 8, until 5 a.m. Monday, May 11. In addition, the Montlake Blvd. on-ramp to eastbound SR 520 will also close.

What to expect:

During this closure, crews will finalize a traffic shift of the northbound I-5 ramp to eastbound SR 520. When eastbound SR 520 reopens on May 11, northbound I-5 traffic will use a new temporary ramp to access eastbound SR 520. Please pay attention to the new signage and allow for time to adjust to the new setup.

Southbound I-5 and westbound SR 520 are not affected by this work.

SR 520 remains open in both directions across Lake Washington. It is only the section of eastbound SR 520 between I-5 and Montlake Blvd. that will close.

Please note: While eastbound SR 520 remains open across Lake Washington, only HOV 3+ and transit are allowed to use the direct access ramps on Montlake Blvd. to access eastbound SR 520. All other travelers must use alternate routes.

Date: May 29, 2026 to June 1, 2026

Time: 11 p.m. Friday to 5 a.m. Monday

Activity details:

Impact type:

Description: Crews will use the closure to prepare for an upcoming traffic switch of the eastbound off-ramp to Montlake Blvd. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project. Learn more about this traffic shift on our latest blog post.

Traffic: Eastbound SR 520 and all associated on- and off-ramps between I-5 and Montlake Blvd. in Seattle will close for construction beginning at 11 p.m. on Friday, May 29, until 5 a.m. Monday, June 1.

Please see this closure update for important information about the eastbound SR 520 off-ramp to Montlake Blvd. reopening timeline.

During this closure, crews will adjust the exit point to Montlake Blvd. and connect the bridge to a new, temporary off-ramp. Crews will also connect the temporary off-ramp to Montlake Blvd. and then prepare to remove the existing off-ramp to make space for future construction.

Westbound SR 520 remains open across Lake Washington to I-5. Eastbound SR 520 remains open across Lake Washington. It is only the section of eastbound SR 520 between I-5 and Montlake Blvd. that will close.

Date: May 29, 2026 to June 8, 2026

Time: 11 p.m. May 29 to 5 a.m. June 8 (around-the-clock)

Activity details:

Impact type:

Description: Crews will use this closure to remove the existing off-ramp and prepare eastbound traffic to use the new, temporary off-ramp to Montlake Blvd. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project.

Traffic: The eastbound SR 520 off-ramp to Montlake Blvd. will close for a major construction shift beginning at 11 p.m. on Friday, May 29, until 5 a.m. on Monday, June 8.

Important details:

• The ramp will close along with eastbound SR 520 between I-5 and Montlake Blvd. beginning at 11 p.m. Friday, May 29.
• On Monday, June 1, eastbound SR 520 between I-5 and Montlake Blvd. will reopen at 5 a.m.
• However, the eastbound SR 520 off-ramp to Montlake Blvd. will remain closed around-the-clock until 5 a.m. on Monday, June 8.

Following the weekend closure on June 1, all traffic from I-5 entering eastbound SR 520 will cross Lake Washington and pay the SR 520 Bridge Toll with this ramp closed. Those who do not want to pay the toll or who need to access Montlake Blvd. from I-5 must use alternate routes.

What’s happening:

Crews will use this extended closure to remove the existing eastbound off-ramp to Montlake to make space for construction of new permanent elements for the future new bridges. We’ll need to keep the ramp closed so they have the room to bring in equipment to remove the old ramp and finalize the connection of the new temporary ramp to Montlake Blvd.

What you need to prepare for:

This around-the-clock ramp closure will have significant impact for travelers needing to access Montlake Blvd. and will require an adjustment to their travels. For those wanting to access the University of Washington or the UW Medical Center, you will need to take a different route. If you choose to stay on eastbound SR 520, you will cross Lake Washington and then need to turn around and take westbound SR 520 to exit at Montlake. Please note this will result in you being tolled twice.

Potential alternate routes to Montlake from I-5 include:

Northbound I-5 travelers

• Take the Lakeview Boulevard exit, just south of the exit to eastbound SR 520.
• Continue north past the exit to eastbound SR 520 and take the Northeast 45th Street exit.

Southbound I-5 travelers

• Exit at either Northeast 45th Street or Northeast 50th Street and head east.
• Take the Boylston Avenue East exit and head east.

Any changes or updates to this work will be shared on this page and in our weekly email updates.