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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 Avenue 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 07/21/2014

Daytime lane restrictions on northbound SR 99 on Wednesday, July 23

On Wednesday, July 23, the right lane on northbound SR 99 will be closed between Republican and Roy streets from 10:00 a.m. to 2:00 p.m. to accommodate bridge work.

Dexter Ave. N shifted to temporary roadway for one year

Beginning in July, traffic on Dexter Ave. N  has been shifted onto a temporary roadway between Roy and Republican Sts. so that crews may work in the intersection of Dexter Ave. N and Mercer St. Travelers can expect the following conditions:

  • Travel lanes shifted to the east of the existing intersection at Dexter Ave. N and Mercer St.
  • One lane of traffic in each direction (same as the current configuration)
  • Separated bicycle lanes
  • Pedestrian access along the east side of the roadway

Over the next month, crews will construct an additional temporary roadway along the south side of Mercer St. between the SR 99 overpass and 8th Ave. N. Once complete, traffic will be shifted onto the temporary road with two lanes in each direction. These activities will temporarily shift the intersection of Mercer St. and Dexter Ave. N to the southeast and allow crews to complete demolition and utility work in the current intersection of Mercer St. and Dexter Ave. N while maintaining traffic through the corridor. The temporary roadways on Mercer St. and Dexter Ave. N will be in place for approximately one year.

Pedestrians and bicyclists shifted to the south side of Mercer Street

Pedestrians and bicyclists should now use the south side of Mercer St. between 5th Ave. N and Dexter Ave. N. Please note the recent changes within the corridor:

  • The new sidewalk on the south side of Mercer Street will be in place between 5th Ave. N and Aurora Ave. N and a temporary pathway will connect pedestrians and bicyclists from Aurora Ave. N through the work zone to Dexter Ave. N.
  • No pedestrian access will be allowed on the north side of Mercer St. between Taylor Ave. N and Dexter Ave. N.
  • Travelers headed to and from South Lake Union from the Uptown neighborhood should use the south side of Mercer St. to 5th Ave. N, rather than Taylor Avenue N.
  • To increase safety for pedestrians and cyclists using the corridor, the crosswalk at Taylor Ave. N and Mercer St. is now closed. Please follow detour signs and use Roy St. to cross Taylor Ave. N.
  • New bicycle lanes on Roy St. are open and fully operational between 5th Ave. N and Queen Anne Ave. N.
  • Crews are constructing a temporary roadway along the east side of Dexter Ave. N between Mercer and Roy streets, which will include bike lanes.
  • When the project is complete in fall of 2015, a new sidewalk and a separated bicycle path will be in place on the north side of Mercer St. between 5th Ave. N and Dexter Ave. N. 

Pedestrian and bicycle route map

Extended lane restrictions on Dexter Ave. N continue for approximately one year

Beginning Monday, June 16 and for approximately one year, crews will restrict Dexter Ave. N to one lane in each direction between Valley and Republican streets to accommodate roadway and utility improvements at the intersection of Mercer St. and Dexter Ave. N. Lane restrictions on Dexter Ave. N began in June and travelers can expect the following impacts:

  • Dexter Ave. N between Valley and Republican streets will be restricted to one lane in each direction for approximately one year. One lane will be open for both northbound and southbound traffic at all times.
  • Left turns from southbound Dexter Ave. N to eastbound Mercer St. will be allowed and the left turning lane will be maintained.
  • Please note the Washington Department of Transportation’s Alaskan Way Viaduct Replacement Project is also working on Dexter Ave. N and lane restrictions will continue on Dexter Ave. N south of Republican St. For more information about this project, visit the Alaskan Way Viaduct Replacement Project website.

Crews will be constructing a temporary roadway along the east side of Dexter Ave. N between Mercer and Roy streets. Once that is complete, traffic will be shifted onto the temporary road with one lane in each direction. Bike lanes will be included on the temporary roadway.

Temporary daytime lane restrictions on 5th Ave. N continue through early August

Crews will restrict 5th Ave. N to one lane in each direction between Mercer and Republican streets daily to accommodate electrical work. Travelers can expect the following impacts:

  • Southbound and northbound 5th Ave. N between Mercer and Republican streets will be restricted to one lane between 9:00 a.m. and 3:00 p.m. Monday through Friday. One southbound lane will remain open at all times.

Intermittent lane closures on Mercer St. through August

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 2:00 p.m. to accommodate construction activities within the work zone. One lane on westbound and eastbound Mercer St. will remain open at all times.

Intermittent lane closures on Roy St. continue through July

Roy St. between Queen Anne Ave. N and 5th Ave. N will have intermittent single lane/parking lane restrictions between 7:00 a.m. and 3:00 p.m. to accommodate final punch list items.

New traffic conditions now in place

Commuters should take note of new travel conditions throughout the corridor effective immediately. Mercer St. is now open to two-way traffic between I-5 and Elliott Ave. W and Broad St. is permanently closed between 9th Ave. N and 5th Ave. N. All travelers are advised to plan ahead for their commute and use alternate routes where possible to accommodate increased traffic on eastbound Mercer St. Changes through the corridor also include:
  • Mercer St. is open with two lanes in each direction between Queen Anne Ave. N and 9th Ave. N.
  • Access to Seattle Center and Queen Anne is now a direct route via westbound Mercer St. from I-5.
  • Roy St. is open with one lane in each direction between Queen Anne Ave. N and 5th Ave. N.
  • Queen Anne Ave. N is open with one northbound lane and two southbound lanes between Roy and Mercer Streets.
  • Left turns from westbound Mercer St. onto southbound 5th Ave. N are available.
  • Left turns from eastbound Mercer St. onto northbound Dexter Ave. N will not be allowed for approximately one year.
  • Access to northbound SR 99 from eastbound Mercer St. is via southbound Dexter Ave. N onto westbound Thomas St.
  • New signal at Taylor Ave. N and Mercer St.
  • Left turns from eastbound Mercer St. onto northbound Taylor Ave. N and northbound Dexter Ave. N will not be allowed.
  • Access to northbound SR 99 from eastbound Mercer St. will be via southbound Dexter Ave. N onto westbound Thomas St.

Additional signage and alternate route information will be available in advance.

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.

In its final configuration, Mercer St. will maintain three lanes in each direction between 5th Ave. N and I-5. All lanes will be operational by the summer of 2015. Until that time, Mercer St. will operate in a temporary configuration with two lanes in each direction.

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 mercerinfo@seattle.gov 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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