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Closure of S bound SR 99 & E bound Mercer St. begins Friday, March 21.
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Closure of Southbound SR 99 and Eastbound Mercer Street begins Friday, March 21 at 11:00 p.m.

Southbound SR 99 and Eastbound Mercer Street will be fully closed to traffic beginning the evening of Friday, March 21 at 11:00 p.m. for the setting of the SR 99 bridge girders over Mercer Street during the closure:

  • Southbound SR 99 will be fully closed to traffic between Valley Street and the Southern end of the Battery Street Tunnel. Traffic traveling through Seattle via SR 99 will be directed to I-5 in Northern Seattle at 85th Street.  More information about alternate routes during construction may be found at: http://www.seattle.gov/transportation/mercercorridor.htm. 
  • Eastbound Mercer Street will be fully closed to traffic between 5th Avenue North and Dexter Avenue North Traffic heading East towards I-5 from Queen Anne will be detoured to 5th Avenue North to either Denny Way to access Southbound I-5 at Yale Avenue or through downtown on 5th Avenue North to access Northbound or Southbound I-5.
  • The sidewalk on Mercer Street will also be closed between 5th Avenue North and Dexter Avenue North Pedestrians will be detoured to Broad Street.
  • The I-5 off-ramps at Mercer Street, Westbound Mercer Street, and Broad Street will remain open during this work. 

Early warning signs will be available in advance of the SR 99 lane restrictions and Mercer Street detours. Travelers can expect significant traffic and delays and should plan ahead and use alternate routes.

Access to Seattle Center from I-5 via westbound Mercer and Broad Streets and from Southbound SR 99 at Valley Street will be open through the weekend, but travelers should expect delays.

Southbound SR 99 re-opens midday Saturday, March 22; Eastbound Mercer St. between 5th Ave. N and Dexter Ave. N remains closed through approximately 6:00 p.m. on Saturday, March 22.

After crews complete the setting of the SR 99 bridge girders over Mercer Street, Southbound SR 99 will re-open to traffic at approximately 12:00 p.m. on Saturday, March 22. Eastbound Mercer Street will remain closed between 5th Avenue North and Dexter Avenue North through approximately 6:00 p.m. on Saturday, March 22.

Please note that SR 99 will remain closed South of Denny Way for Alaskan Way Viaduct-related work from 4:30 a.m. though 7:00 p.m. on Saturday, March 22.

Daytime closures of the I-5 on-ramps at Mercer Street scheduled for Saturday, March 22 and Sunday, March 23 from 8:00 a.m. to 6:00 p.m.

The I-5 on-ramps at Mercer Street will be fully closed to traffic on Saturday, March 22 and Sunday, March 23 between the hours of 8:00 a.m. and 6:00 p.m. each day.

During the closures:

  • Eastbound traffic on Mercer St. will be detoured South on Fairview Avenue North to either Denny Way for access to Southbound I-5 at Yale Ave., or to Boren Avenue and Olive Way for access to Northbound I-5.
  • The I-5 off-ramps at Mercer Street, Westbound Mercer Street, and Broad Street will remain open throughout the weekend.
  • The on-ramps will reopen Saturday evening at 6:00 p.m. and will remain open until Sunday morning at 8:00 a.m., at which time the on-ramps will close again until work is completed at approximately 6:00 p.m. Sunday evening.
  • Uniformed police officers will be positioned at various intersections along the detour route to facilitate traffic flow.

Please note that all South Lake Union businesses will remain open and accessible via alternate routes. The on-ramps work is weather dependent and may be rescheduled in the event of inclement weather.

Early warning signs will be available in advance of all detours. More information about alternate routes during construction may be found at: http://www.seattle.gov/transportation/mercercorridor.htm.



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