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Mercer Corridor Project
Weekly Construction Wrap-Up

mercer_logo_200This week, crews continued to work on underground utilities on Valley Street, Broad Street, Ninth Avenue North and Westlake Avenue North, north of Mercer Street. Crews also continued construction on the north side of Mercer Street between Fifth Avenue North and Dexter Avenue North and the east side of SR 99 between Valley Street and Harrison Street.

Activities this week included:

  • Began night work at the intersection of Ninth Avenue North and Broad Street for underground water main and stormwater utilities. One lane in each direction will be maintained on Ninth  from Mercer Street to just north of Broad Street during work hours. Work will occur on weeknights from 7 p.m. to 6 a.m. for approximately three weeks. Please note, Ninth Avenue  North will be re-opened during the day to accommodate higher traffic volumes.
  • Began sawcutting, sidewalk removal and conduit installation on Roy Street between First  Avenue North and Fifth Avenue North. Work will progress from west to east and will include parking lane closures while construction activities are underway.
  • Continued work on the east side of SR 99 and Mercer Street between Fifth Avenue North and Dexter Avenue North including water line work, excavation and shoring for retaining wall removal.
  • Continued Seattle City Light and communications duct bank work on Valley Street between Terry Avenue North and Westlake Avenue North.
  • Continued installation of pole foundations for streetlights on Valley Street between Fairview Avenue North and Terry Avenue North.

Reminder: The I-5 on- and off-ramps at Mercer Street will be closed beginning tonight, June 7 at 11 p.m. through Monday, June 10 at 5 a.m. For more information on associated traffic impacts, please visit our website at:

Traffic engineers will continue to:

  • Monitor traffic on Mercer Street, Fifth Avenue North, Broad Street and Ninth Avenue North.
  • Monitor traffic at the Westlake Avenue North and Mercer Street intersection.
  • Monitor traffic flow at the Dexter Avenue North and Mercer Street intersection.

For up-to-minute construction updates join our project email list at:  or call the 24-hour construction hotline at 206-419-5818.