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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 09/12/2014

Daytime lane restrictions on 5th Ave. N between Republican and Mercer streets through September

Beginning Monday, September 8, the right lanes of northbound and southbound 5th Ave. N will be closed to accommodate electrical and sidewalk improvements at the southeast corner of 5th Ave. N and Mercer St. for approximately three weeks. Travelers can expect the following impacts:

  • One northbound and one southbound lane on 5th Ave. N between Republican and Mercer streets will be closed Monday through Friday from 9:00 a.m. to 2:00 p.m. daily.
  • Northbound traffic on 5th Ave. N will be able to turn right onto eastbound Mercer St. from the adjacent lane.

Westbound lane restrictions on Mercer St. and full closure of Taylor Ave. N for water line work September 12-15

Beginning the evening of Friday, September 12 at 8:00 p.m. through Monday, September 15 at 5:00 a.m., westbound Mercer St. will be reduced to one lane between Dexter Ave. N and 5th Ave. N to accommodate water main installations on the north side of the roadway. Taylor Ave. N will also be fully closed between Roy and Mercer streets for the duration of this work. Travelers can expect the following impacts:

  • Turns to and from Mercer St. at Taylor Ave. N will be prohibited.
  • Travelers from Queen Anne should use southbound 5th Ave. N to access Mercer St.
  • Local access to businesses on Taylor Ave. N between Mercer St. and Roy St. will be maintained from Roy St.
  • One lane on westbound Mercer St. will remain open at all times.

Following the weekend work, Taylor Ave. N will be restricted to southbound travel only for approximately three weeks as crews complete water line connections in the roadway. Travelers from westbound Mercer St. should use 5th Ave. N to continue north to the Queen Anne neighborhood.

Eastbound Mercer St. and Dexter Ave. N lane restrictions, September 12-13

Lane restrictions on eastbound Mercer St. between 5th Ave. N and Dexter Ave. N will begin Friday evening, September 12 and continue through Saturday, September 13 for paving activities. Travelers can expect the following impacts between 9:00 p.m. Friday and 5:00 p.m. Saturday:

  • The right lane of eastbound Mercer St. between 5th Ave. N and Dexter Ave. N will be closed. One eastbound lane on Mercer St. will be open at all times.
  • One southbound lane on Dexter Ave. N will be closed between Roy and Republican streets. Southbound Dexter Ave. N traffic will be routed abound the closure.
  • The intersection of Mercer St. and Dexter Ave. N will be controlled by a uniformed police officer.
  • Please plan ahead and use alternate routes when possible.

Southbound lane restriction on Dexter Ave. N between Roy and Mercer streets during the evenings September 15-19

Beginning September 15 and continuing through September 19, southbound Dexter Ave. N will be restricted to one lane between Roy and Mercer streets from 8:00 p.m. to 6:00 a.m. while crews complete underground utility work. One lane on southbound Dexter Ave. N will remain open at all times. Bicyclists will be required to merge with vehicular traffic.

New crosswalk opens at Taylor Ave. N and Mercer St. in mid-September

Beginning in mid-September, a new crosswalk across Mercer St. at Taylor Ave. N will open to aid in pedestrian accessibility through the area. Please pay attention to detour signs and follow pedestrian routes accordingly.

Mercer St. shifted to temporary roadway for one year

Beginning in August, drivers will notice a shift in the configuration of Mercer St. as it crosses Dexter Ave. N. Mercer St. will be shifted south to allow for demolition of the bridge over Broad St. and utility work through the intersection for approximately one year. Turning movements and the number of eastbound and westbound lanes will remain unchanged. Travelers can expect the following conditions:

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

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

Intermittent lane closures on Roy Street through fall of 2014

Roy Street between Fifth Avenue N and Queen Anne Avenue N will continue to 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. Please pay attention to flaggers stationed in the roadway.

Intermittent lane closures on Mercer St. through fall of 2014

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.

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 atmercerinfo@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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