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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  05/20/2015

SDOT wishes everyone a safe and happy Memorial Day weekend.

Please keep the following in mind as you travel through the corridor:

  • There are no traffic closures associated with the Mercer Corridor Project for Memorial Day weekend, Friday, May 22 to Monday, May 25.
  • Please be mindful of increased pedestrian traffic associated with the Northwest Folklife Festival at Seattle Center and drive safely.
  • The southeast corner of 5th Ave. N and Thomas St. (near McDonald’s) will remain closed through the weekend. Please obey detour signage and use the west side of 5th Ave. N to cross Broad St.
  • The south and east crosswalks at Mercer St. and Dexter Ave. N will remain closed through the weekend. Please obey detour signage and use the north and west crosswalks at this intersection.

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

Crews continue sidewalk and electrical improvements at the southeast corner of 5th Ave. N and Thomas St. Work is expected to continue through early June. As early as June 6, crews will transition to the southwest corner to continue improvements at this intersection. 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. Please access McDonald’s from the south via John St.

Bicycle path on Mercer St. opens May 1 for Bike to Work Month

Beginning Friday, May 1 the two-way bicycle path on the north side of Mercer St. between Dexter Ave. N and 5th Ave. N will be open. The pathway will remain open and available for cyclists to use for the month of May and will close again for up to two weeks in June to accommodate work under the SR 99 Bridge. 

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:

New configuration at Dexter Ave. N and Mercer St.
Beginning Monday, April 20, northbound Dexter Ave. N will be in a temporary configuration for approximately six weeks as crews continue sidewalk, pavement, and signal work on the east side of Dexter Ave. N. Travelers can expect the following: 

  • There is one northbound lane on Dexter Ave. N for thru and right turning traffic approaching Mercer St.
  • Southbound Dexter Ave. N open to two lanes of traffic north of Mercer St. Southbound left turns from Dexter Ave. N onto Mercer St. are allowed, but all other left turns remain restricted at this intersection.
  • Drivers are prohibited from turning right from southbound Dexter Ave. N onto westbound Mercer St. Use 9th Ave. N as an alternate route to access westbound Mercer St.
  • Pedestrians should use the east side of Dexter Ave. N and the north side of Mercer St. between 5th Ave. N and 9th Ave. N.

Detailed maps of this intersection can be found on the project maps page.

Intermittent lane closures on Mercer St. through spring 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

Crews continue to monitor intersections throughout the corridor

We appreciate your patience as we work to improve flow throughout the corridor. Please continue to use alternate routes where possible and notify the project with any feedback, suggestions, or questions at or (206) 419-5818.

Lane reductions on Mercer St. will continue throughout the West Phase of the Mercer Corridor Project, which is anticipated to be completed in mid-2015. Construction of this $95 million project will take approximately 2.5 years.

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