The Seattle Department of Transportation (SDOT) reminds travelers of the upcoming full weekend closure of SR 99 and Mercer Street between Fifth Avenue North and Dexter Avenue North scheduled to occur this weekend, July 5-8 for construction activities associated with the West Phase of the Mercer Corridor Project.
Over the weekend, Mercer Corridor Project crews will demolish the east side of the SR 99 bridge over Mercer Street. SR 99 and Mercer Street will be fully closed to traffic beginning Friday, July 5 at midnight to Monday, July 8 at 5 a.m. During the closure:
- SR 99 will be fully closed 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 north of Seattle at North 85th Street or south of Seattle at East Marginal Way South and South Spokane Street. More information about alternate routes during construction may be found at: http://www.seattle.gov/transportation/mercercorridor.htm.
- Mercer Street will be fully closed to traffic between Fifth Avenue North and Dexter Avenue North. Traffic heading east towards I-5 will be detoured to Harrison and Broad streets at Fifth Avenue North and will reconnect to Mercer Street at Ninth Avenue North to continue east.
- No pedestrian access will be allowed on Mercer Street between Fifth Avenue North and Dexter Avenue North during the weekend closure. Pedestrians will need to use the sidewalk on the north side of Broad Street to cross SR 99.
- The I-5 on- and off-ramps at Mercer Street and Broad Street will remain open during the weekend work.
Early warning signs will be available in advance of the SR 99 lane restrictions. Travelers can expect significant traffic and delays and should plan ahead and use alternate routes.
Contact: SDOT Media Hotline at 206-684-3151.