There is no construction scheduled on Mercer Street in September. Here is a quick summary of upcoming projects:
Timed traffic lights are expected to be installed later in 2016 on Mercer Street. A specific date has not been set. The lights are part of what the Seattle Department of Transportation calls adaptive signal controls.
Nearby Aurora Avenue North continues to be rebuilt as part of the highway connect redesign. That project, done by the Washington State Department of Transportation, will bridge Aurora going southbound at Mercer to the new tunnel being dug by Bertha. Aurora will have signalized intersections at John, Thomas, and Harrison streets once the tunnel is open to traffic. That is not expected to be completed in 2016.
Here’s a recap from SDOT of recent projects:
June 2015: Opened the new Dexter-Mercer intersection including new bike lanes, sidewalks, striping, and a new signal. (No. 6 on the map.)
May 2015: Opened the new bike lanes on the north side of Mercer St. between Dexter Ave. N and 5th Ave. N connecting the South Lake Union and Uptown neighborhoods. (No. 5)
November 2014: Opened third eastbound lane on Mercer St. between 5th Ave. N and 9th Ave. N, and opened two new left turn lanes from westbound Mercer St. onto southbound 5th Ave. N. (No. 4)
June 2014: Permanently closed Broad St. between 9th Ave. N and 5th Ave. N to accommodate the widening of Mercer St and construction of the North Portal Area of the SR 99 Tunnel. (No. 3)
May 2014: Opened Mercer St. between 1st Ave. N and 9th Ave. N; Roy St. between Queen Anne Ave. N and 5th Ave. N; and Queen Anne Ave. N between Roy and Mercer streets to two-way traffic. (No. 2)
December 2014: Completed new SR 99 bridge over Mercer St. Replacing the old bridge allowed for the critical widening of Mercer St. providing enough space for three lanes of traffic in each direction and more space for pedestrians and bicycles. (No. 1)