August 10

Mercer Corridor Project to cause closures all month



Once again the Seattle Department of Transportation will be closing down the Mercer Street on and off ramps to I-5 for two full weekends this month in order to do ongoing work required for the Mercer Corridor Project. The closures will take place from 11 p.m. this coming Friday, August 12 until 5 a.m. on Monday, August 15, and again from August 26 to 29 during the same hours.

Detour signs will be posted around the area, but if you’d like to look up the detour routes beforehand, you may download them both here:

Access from I-5 Detour Map
Access to I-5 Detour Map

In addition to these two closures, WSDOT will be concurrently closing all lanes on SR 520 from 11:00 p.m. Friday, August 26, to 5:00 a.m. Monday, August 29, between Montlake Boulevard and I-405 in Bellevue. (SR 520 from I-5 to Montlake Boulevard will remain open to traffic). Details on this closure and detour maps can be viewed here.

SDOT will also be implementing a number of other nighttime lane closures related to the Mercer Corridor Project throughout the month:

  • Beginning as early as Monday, August 1, northbound Westlake Avenue N will be closed overnight between Mercer Street and Valley Street. Northbound traffic, including King County Metro bus routes, will be detoured to Terry Avenue N from 7:00 p.m. to 5:00 a.m. for approximately one week. Southbound traffic will remain on Westlake Avenue N. For King County Metro bus information, please visit Metro Online at and check the “Alerts Center.”
  • Beginning as early as Monday, August 8, nighttime lane closures will occur intermittently on Mercer Street at both Boren Avenue N and Terry Avenue N to accommodate water main installations lasting approximately three weeks. Up to three lanes of Mercer Street will be closed overnight, and Boren Avenue N and Terry Avenue N will have intermittent closures to through traffic between Republican Street and Mercer Street. Work hours are expected to be 7:00 p.m. to 5:00 a.m.

See a map of all of SDOT’s ongoing and upcoming construction projects citywide here.


I-5 access, Mercer Corridor Project, Mercer Street, Mercer Street I-5 on and off ramp closures, road closures, SDOT, traffic, WSDOT

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