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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  07/24/2015

Look at what we’ve accomplished so far! Read more here.

Lane restrictions on Mercer St. and 5th Ave. N

Beginning Friday, July 31 at 8:00 p.m. and continuing Saturday, Aug. 1 through 1:00 p.m., crews will close multiples lanes near the intersection of Mercer St. and 5th Ave. N to accommodate the completion of storm drain facilities and the removal of overhead wires. Travelers can expect the following impacts:

  • Eastbound Mercer St. reduced to one lane between 5th Ave. N and Taylor Ave. N.
  • Westbound Mercer St. reduced to one lane between Taylor Ave. N and 5th Ave. N.
  • Single lane restrictions on 5th Ave. N between John and Roy streets.
  • All turning motions at the intersection of Mercer St. and 5th Ave. N will remain open.
  • Please plan ahead, expect traffic delays, and use alternate routes when possible.

Lane restrictions on Queen Anne Ave. N and Roy St.

Crews will complete similar work at the intersection of Queen Anne Ave. N and Roy St. Travelers can expect the following on Saturday, Aug. 1 between 9:00 a.m. and noon:

  • Lane restrictions on Roy St. between 1st Ave. N and Queen Anne Ave. N.
  • Lane restrictions on Queen Anne Ave. N between Valley and Mercer streets.
  • All turning motions at the intersection of Queen Anne Ave. N and Roy St. will remain open.
  • Please plan ahead, expect travel delays, and use alternate routes when possible.

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.

Intermittent sidewalk closures on Mercer St. through early August

Through early August, 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: www.seattle.gov/transportation/mercer_maps_detour.htm.

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

Two east-west crosswalks at 5th Ave. N and Broad St. will remain closed until the new signal at this intersection is fully operational in August. Please follow the signed detour routes to increase safety for drivers, other pedestrians and yourself. Pedestrians should cross 5th Ave. N near Ride the Ducks, at Harrison St. or at John St.

Intermittent daytime lane closures on Dexter Ave. N

Dexter Ave. N between Harrison and Valley streets will have intermittent daytime lane closures between 7:00 a.m. and 3:00 p.m. to accommodate construction activities within the work zone.

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. Two westbound and up to three eastbound lanes will remain open on Mercer St. at all times.


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