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Mercer Corridor Project

If you need this information translated, please call (206) 733-9990.
Si necesita traducir esta información al español, llame al (206) 733-9990.

The Mercer Corridor stretches from Interstate 5 to 5th Ave. W, and has been one of the City of Seattle’s most significant transportation challenges for over 40 years. SDOT is committed to improving the Mercer Street Corridor by 2016.

Learn more about the Mercer Corridor Project or subscribe to email alerts.

Last updated  07/06/2015

Intermittent sidewalk closures on Mercer St. through July

Through July, crews will close either the north or south sidewalk on Mercer St. between 5th Ave. N and Dexter Ave. N to complete construction activities during daytime hours, 7 a.m. to 4 p.m. Travelers can expect the following:

  • A sidewalk on the north or south side of Mercer St. between South Lake Union and the Uptown neighborhood will be maintained at all times. Please pay attention to and obey sidewalk closures and detour signage for your safety and the safety of others.
  • The sidewalk along the south side of Mercer St. is a shared pathway for pedestrians and bicyclists. Bicyclists should yield to pedestrians and may choose to dismount and walk their bicycles while using the shared sidewalk.
  • You may call the 24-hour construction hotline at (206) 419-5818 to ask which sidewalk will be open for a particular day. 
  • More information about pedestrian and bicycle access during construction can be found at:

Construction schedule update

Mercer West construction is progressing throughout the corridor and SDOT anticipates substantial completion to occur later this summer. Prior to that, crews need to complete a series of upcoming major milestones, including:

  • Sidewalk and landscaping completion on the south side of Mercer St. between 5th Ave. N and 9th Ave. N.
  • Constructing the median between 8th Ave. N and 9th Ave. N on Mercer St. and opening the eastbound and westbound left-turn lanes at 9th Ave. N.
  • Completing intersection modifications including a new signal at 5th Ave. N and Thomas St.

Details regarding remaining milestone completion will be sent out as they become available.

Pedestrian improvements at 5th Ave. N and Thomas St.

Crews have transitioned to the southwest corner of 5th Ave. N and Thomas St. to continue improvements at this intersection. Work is expected to continue through July 10. Once work is completed at the southwest corner, crews will transition to the northwest corner. Travelers can anticipate the following impacts:

  • Crosswalks adjacent to the work zone will be temporarily closed and pedestrian traffic detoured up to two blocks around the closure. Please obey all detour signage.
  • Bus stops along 5th Ave. N may close temporarily throughout construction.
  • Local access will be maintained to all businesses.

Intermittent nighttime lane closures on Dexter Ave. N

Dexter Ave. N between Harrison and Valley streets will have intermittent nighttime lane closures between 9:00 p.m. and 6:00 a.m. to accommodate construction activities within the work zone.

Bicycle route details and reminders

  • The bicycle pathway on the west side of 5th Ave. N will remain closed. Southbound cyclists on 5th Ave. N may ride in the roadway or use the sidewalk.
  • Northbound cyclists on 5th Ave. N may cross 5th Ave. N on the north side of Mercer St. to continue north on the 5th Ave. N bike lane or east on the new Mercer bike path.
  • Northbound cyclists on Dexter Ave. N are required to merge with vehicular traffic when approaching Mercer St.
  • Bicycle signal heads will not be activated at this time.
  • Cyclists are reminded to yield to pedestrians at intersections and observe pedestrian signals when crossing streets.
  • For more information about SDOT’s bicycle rules, please visit:

Intermittent lane closures on Mercer St. through summer 2015

Mercer St. between 1st Ave. N and 9th Ave. N will have intermittent lane closures during off-peak travel times between 9:00 a.m. and 3:00 p.m. to accommodate construction activities within the work zone. One westbound and up to two eastbound lanes will remain open on Mercer St. at all times.

Alternate routes through the corridor

With the closure of Broad St. and two-way traffic on Mercer St., Roy St., and Queen Anne Ave. N now in place, please consider using the following alternate routes during construction:

  • Use Roy St. as an alternate eastbound route through the Uptown neighborhood.
  • To access north Queen Anne, use Mercer St. and then proceed north on Queen Anne Ave. N.
  • Use eastbound Denny Way, 2nd Ave. or 5th Ave. to access I-5.
  • Use SR 99 and Elliott Ave. W as alternate routes to and from your final destination.
  • Access southbound SR 99 from Aloha or Valley streets.
  • To access northbound SR 99, use 2nd Ave. or 5th Ave. south from Denny Way and turn left on Battery St.

Route maps for navigating the corridor


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