Mercer Corridor Project: Mercer and Roy streets transition to two-way traffic this spring; Broad Street closes this June

The Seattle Department of Transportation (SDOT) announces a major milestone for the Mercer Corridor Project with two-way traffic opening on Mercer Street between First Avenue N and Ninth Avenue N and on Roy Street between Queen Anne Avenue N and Fifth Avenue N this spring.

Construction to extend two-way Mercer Street from Ninth Avenue N to First Avenue N in Uptown began in April 2013. Over the past year, crews have completed demolition and substantial reconstruction of the SR 99 bridge over Mercer Street, relocated utilities between Fifth Avenue N and Ninth Avenue N, and completed street light upgrades, signal installations and pedestrian improvements between Queen Anne Avenue N and Fifth Avenue N.

Beginning in late April, travelers will experience major corridor changes as crews begin converting Mercer Street, Roy Street and Queen Anne Avenue N to two-way traffic. The transition to two-way traffic will occur in three phases:

  • The first phase will include shifting the two eastbound Mercer Street traffic lanes onto their permanent location on the south side of the roadway between First Avenue N and Fifth Avenue N and installing channelization for the new westbound traffic lanes.
  • At the end of this initial phase, traffic signals will be activated and Mercer Street will be opened for two-way traffic starting at First Avenue N and working toward Fifth Avenue N over a period of several days.
  • The second phase will include converting Roy Street between Queen Anne Avenue N and Fifth Avenue N to two-way traffic. During this conversion, westbound Roy Street will be reduced to one lane while final channelization is put into place. Signals will be activated for two-way traffic on Roy Street starting at Fifth Avenue N and working toward Queen Anne Avenue N over a period of several days.
  • The final phase of the transition will include opening Mercer Street to two-way traffic between Fifth Avenue N and Ninth Avenue N as well as the permanent closure of Broad Street in late May or early June. The closure of Broad Street allows for additional space to widen Mercer Street to the south at Dexter Avenue N and continue work associated with the Alaskan Way Viaduct Replacement Project

More information about traffic changes during each phase of construction can be found at: http://www.seattle.gov/transportation/mercercorridor.htm.

Throughout and after the roadway transition, construction impacts will be monitored and will include:

  • Monitoring traffic flow and adjust signal timing as conditions change throughout the corridor
  • Uniformed police officers stationed at key intersections to facilitate traffic flow
  • Additional signage and alternate route information will be available in advance

After opening Mercer Street to two-way traffic between First Avenue N and Ninth Avenue N, construction will continue on Mercer Street between Fifth Avenue N and Ninth Avenue N, including the intersection of Mercer Street and Dexter Avenue N through mid-2015. The final configuration of Mercer Street between Fifth Avenue N and Ninth Avenue N will feature three lanes of traffic in each direction, widened sidewalks, and a bicycle path on the north side of Mercer Street between Dexter Avenue N and Fifth Avenue N.

Continued communication throughout construction

SDOT will continue to provide coordinated construction outreach and updated construction timelines throughout the conversion to two-way traffic, including alternate route maps, email updates and a 24-hour hotline.

To learn more about upcoming construction, SDOT invites you to join the Mercer Corridor Project listserv. You can sign up on the project website: http://www.seattle.gov/transportation/mercercorridor.htm or call 206-419-5818 to join.

Contact:  Richard Sheridan, Communications Director, 206.684.8114