Date: 8/21/2026 to 8/24/2026

Time: 10 p.m. Friday, Aug. 21, to 6 a.m. Monday, Aug. 24

Activity details:

Impact type:

Crews will close Montlake Boulevard between East Hamlin Street and East Louisa Street, as well as some surrounding streets and ramps, including:

• The Montlake Boulevard on-ramps to eastbound and westbound SR 520.
• The eastbound SR 520 off-ramp to Montlake Boulevard.
• A 300-foot-long 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 limited detour south of SR 520.

Work during this closure

During the Aug. 21-24 weekend closure, crews will:

• Install three new mast-arm sign structures (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 that will be mounted on an existing utility pole

Looking for more information about the Montlake sign structure work? Visit our webpage here.

Date: August 8, 2026 to August 9, 2026

Time: 7 p.m. Saturday to 11 a.m. Sunday

Activity details:

Impact type:

Description: Crews will use the closure to repair an expansion joint on the bridge. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project.

Traffic: Eastbound SR 520 between I-5 and Montlake Boulevard will close for construction beginning at 7 p.m. on Saturday, Aug. 8, until 11 a.m. on Sunday, Aug. 9. All traffic from I-5 wanting to head eastbound on SR 520 must use alternate routes.

Please note, eastbound SR 520 is open across Lake Washington. It is only the section of eastbound SR 520 between I-5 and Montlake Boulevard that will close.

Date: August 11, 2026 to August 13, 2026

Time: 10 p.m. to 6 a.m. nightly

Activity details:

Impact type:

Description: Crews will use this closure to re-stripe sections of the ramp. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project.

Traffic: The eastbound SR 520 off-ramp to Montlake Boulevard will close for construction nightly beginning at 10 p.m. until 6 a.m. on Tuesday, August 11 and Wednesday, August 12.

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

Date: July 22, 2025 to July 24, 2025

Time: Wed. 8 p.m.–Thurs. 6 a.m.; Thurs. & Fri. 9:30 a.m.–2:30 p.m.

Activity details:

Impact type:

Description: Crews will use this closure to build a foundation for a future mast-arm sign for the Montlake sign structures work.

Traffic: Neighbors and drivers should prepare for Montlake Boulevard to be reduced to one lane in each direction between East Louisa Street and East Roanoke Street. Expect additional congestion and delays. Allow extra travel time.

Lane reduction dates and times:

• 8 p.m. Wednesday, July 22, to 6 a.m. Thursday, July 23 (overnight)
• 9:30 a.m. to 2:30 p.m. Thursday, July 23 (daytime)
• 9:30 a.m. to 2:30 p.m. Friday, July 24 (daytime)

Crews will build a foundation for a future mast-arm sign, including excavation, concrete placement and site prep.

Date: August 10, 2026 to August 13, 2026

Time: 11 p.m. to 5 a.m. nightly

Activity details:

Impact type:

Description: Crews will use this closure to re-stripe parts of the roadway near the exit ramps to I-5 and East Roanoke Street. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project.

Traffic: Westbound SR 520 between Montlake Boulevard and I-5 in Seattle and all associated on- and off-ramps will close for construction nightly beginning at 11 p.m. until 5 a.m. August 10 – 13.

All westbound SR 520 traffic coming from the eastside must exit at either Montlake or Lake Washington boulevards during the hours this section of SR 520 is closed. Eastbound SR 520 is not affected by this work and will remain open.

Date: July 10, 2026 to July 13, 2026

Time: As early as 10 p.m. Friday until 5 a.m. Monday

Activity details:

Impact type:

Description: Due to construction from a nearby project, select SR 520 ramps will be closed over the weekend to facilitate the work. These closures are not part of the SR 520 Portage Bay Bridge and Roanoke Lid Project.

Traffic: Ahead of the upcoming “Revive I-5” weekend closure, travelers should prepare for delays and consider alternate routes due to ramp closures that begin Friday night, July 10, until Monday morning, July 13.

For more details on the Revive I-5 project, please visit their website.

Ramp closures include:

• Westbound SR 520 off-ramp to northbound I-5
• Westbound SR 520 off-ramp to East Roanoke Street (closing as early as 10 p.m. on July 10)
• Northbound I-5 on-ramp to eastbound SR 520 (due to mainline I-5 closure)

All ramps will reopen by 5 a.m. Monday, July 13.

Date: July 9, 2026 to July 10, 2026

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

Activity details:

Impact type:

Description: Crews will use this closure to remove graffiti and complete other work around the ramps. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project.

Traffic: The westbound SR 520 off-ramp to both northbound I-5 and East Roanoke Street will close for construction maintenance beginning at 10 p.m. on Thursday, July 9, until 6 a.m. Friday, July 10.

During this time, all westbound SR 520 travelers coming from the eastside wanting to go north must exit at either Montlake Boulevard or Lake Washington Boulevard. Drivers who stay on westbound SR 520 beyond those exits will be detoured to southbound I-5.

Date: 7/17/2026 to 7/20/2026

Time: 10 p.m. Friday, July 17, to 6 a.m. Monday, July 20

Activity details:

Impact type:

Crews will close Montlake Boulevard between East Hamlin Street and East Louisa Street, as well as some surrounding streets and ramps, including:

• The Montlake Boulevard on-ramps to eastbound and westbound SR 520.
• The eastbound SR 520 off-ramp to Montlake Boulevard.
• A 300-foot-long 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 limited detour south of SR 520.

Work during this closure

During the July 17-20 weekend closure, crews will:

• Dig, form and pour concrete foundations for three new mast arm structures on Montlake Boulevard.
• Remove the foundations of the third, uninstalled sign bridge that was planned to be installed on Montlake Boulevard south of East Hamlin Street.
• Replace roadway panels on Montlake Boulevard and East Roanoke Street.

This work requires a temporary noise variance from the city of Seattle, and nearby neighbors will be offered a hotel. Nearby neighbors can expect to hear construction noise and potentially feel vibration from concrete sawing, excavation, digging, hauling, vacuum truck operations and concrete pours.

Looking for more information about the Montlake sign structure work? Visit our webpage here.