Westbound SR 520 off-ramp to northbound I-5 and East Roanoke Street closed most weeknights

Date: Oct. 5, 2026 to the morning of Dec. 4

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

Activity details:

Impact type:

Description: Crews will use these closures to facilitate excavation near the off-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 nightly from 10 p.m. to 6 a.m. on select weeknights beginning Monday, Oct. 5, until at least the morning of Wednesday, Nov. 25. During these closures, all westbound SR 520 traffic that remains on westbound SR 520 past the Montlake Blvd. exit will detour to southbound I-5. In addition, a single right lane on westbound SR 520 between Montlake and I-5 will also close during these dates and hours. The ramp and lane will reopen at 6 a.m. each of the following mornings.

Please note: Crews will excavate this area only during daytime hours. The nightly ramp closures are for the trucks to have the necessary space to load the excavated soil and haul it away.

Weekly closure schedule

This ramp is anticipated to close most weeknights through November. To help with planning, the table below lists this week’s closure and will be updated as new information becomes available. Please check back regularly for updates.

Date	Closure	Status (Active or Canceled)
Monday, Nov. 9 | 10 p.m. to 6 a.m.	Westbound SR 520 off-ramp to both northbound I-5 & East Roanoke Street	Cancelled
Tuesday, Nov. 10 | 10 p.m. to 6 a.m.	Westbound SR 520 off-ramp to both northbound I-5 & East Roanoke Street	Cancelled
Wednesday, Nov. 11 | 10 p.m. to 6 a.m.	Westbound SR 520 off-ramp to both northbound I-5 & East Roanoke Street	Active
Thursday, Nov. 12 | 10 p.m. to 6 a.m.	Westbound SR 520 off-ramp to both northbound I-5 & East Roanoke Street	Active