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CityLink Seattle

Mercer Corridor Project: Broad Street Permanently Closing Sunday Evening, June 1

Two-way operations begin on Mercer from Fifth to Ninth Avenues N

The Seattle Department of Transportation (SDOT) advises travelers that Broad Street will permanently close to traffic between Ninth Avenue N and Fifth Avenue N the evening of Sunday, June 1.While necessary to complete major roadway improvements, the closure will create significant traffic disruptions along the Mercer Corridor. Motorists are advised to use alternate routes and expect lengthy travel delays due to the Broad Street closure and drivers adjusting to two-way operations on Mercer Street.

Broad Street permanently closing

Beginning the evening of Sunday, June 1, Broad Street will permanently close to traffic between Ninth Avenue N and Fifth Avenue N as Mercer Street opens for the first time to two-way traffic connecting I-5 to lower Queen Anne. The permanent closure of Broad Street is necessary to allow for additional construction associated with the Mercer Corridor Project and WSDOT’s Alaskan Way Viaduct Replacement Project. The closed portion of Broad Street will be used to widen Mercer Street in its final configuration of three lanes in each direction between I-5 and Fifth Avenue N and for the SR 99 North Access Project which will build connections onto adjacent surface streets from the future SR 99 bored tunnel.

New traffic conditions begin Monday, June 2

Beginning Monday morning, June 2, commuters should take note of new travel conditions throughout the corridor. Mercer Street will be open to two-way traffic between I-5 and Elliott Avenue W and Broad Street will be permanently closed between Ninth Avenue N and Fifth Avenue N. All travelers are advised to plan ahead for their commute and use alternate routes where possible as the number of vehicles using eastbound Mercer Street will increase. Changes through the corridor will include:

  • Mercer Street will have two lanes in each direction between Queen Anne Avenue N and Ninth Avenue N.
  • Access to Seattle Center and Queen Anne will be a direct route via westbound Mercer Street from I-5.
  • Roy Street will have one lane in each direction between Queen Anne Avenue N and Fifth Avenue N.
  • Queen Anne Avenue N will have one northbound lane and two southbound lanes between Roy and Mercer Streets.
  • Left turns from westbound Mercer Street onto southbound Fifth Avenue N will be available.
  • Left turns from eastbound Mercer Street onto northbound Dexter Avenue N will not be allowed for approximately one year.
  • Access to northbound SR 99 from eastbound Mercer Street will be via southbound Dexter Avenue N onto westbound Thomas Street.

The project team understands the first few days of the transition will require additional surveillance throughout the corridor. SDOT will continue to monitor signal timing and message traffic conditions via our project listserv and website. Additional mitigation measures will include:

  • Observing traffic flow and adjusting 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.

The previously announced weekend construction impacts for May 31-June 2 are detailed below:

Closure of northbound Queen Anne Avenue N at Roy Street: May 31 – June 1

Beginning Saturday, May 31 at 4:00 a.m. through Sunday, June 1 at 5:00 a.m., access to northbound Queen Anne Avenue N will be fully closed to traffic from Roy Street to accommodate roadway striping and final two-way signal conversion. During the closure:

  • Access to northbound Queen Anne Avenue N will be closed to traffic at Roy Street. Travelers heading north from westbound Roy Street will be detoured onto southbound Queen Anne Avenue N and then right onto Mercer Street to proceed north on Second Avenue W. Travelers from Downtown should use First Avenue N to westbound Mercer Street and Second Avenue W or Fifth Avenue N and Taylor Avenue N to access Queen Anne.
  • Southbound Queen Anne Avenue N will be reduced to two lanes between Roy and Mercer streets.
  • Access to Queen Anne Avenue N from eastbound Roy Street will be closed. Turns onto westbound Roy Street from southbound Queen Anne Avenue N will not be allowed.
  • Uniformed police officers will be placed at the intersection of Roy Street and Queen Anne Avenue N to facilitate traffic flow.

Mercer Street between Fifth Avenue N and Ninth Avenue N converting to two-way traffic June 1 – 2:

On Sunday, June 1 at 1:00 p.m. following the Race for the Cure, crews will begin converting the final section of Mercer Street to two-way traffic between Fifth Avenue N and Ninth Avenue Nand permanently closing Broad Street. During the conversion:

  • Mercer Street will be fully closed to traffic between Fifth Avenue N and Ninth Avenue N. As intersections are converted to two-way traffic, roadways will be re-opened.
  • Uniformed police officers will be placed at impacted intersections along Mercer Street between Fourth Avenue N and Ninth Avenue N to facilitate traffic flow and direct vehicles around the closures.
  • Denny Way and First Avenue N will remain fully open.
  • Broad Street will permanently close to traffic between Ninth Avenue N and Fifth Avenue N once Mercer Street re-opens with two-way traffic between Fifth Avenue N and Dexter Avenue N (the evening of Sunday, June 1).

Please plan ahead and expect significant traffic delays.

More information about alternate routes during construction may be found at: http://www.seattle.gov/transportation/mercercorridor.htm. Contact:  Richard Sheridan, Communications Director, 206.694.8540