Northbound SR 99 and eastbound Mercer Street will be fully closed to traffic beginning Friday, Sept. 6, at 11 p.m. through Saturday, Sept. 7, at 2 p.m.
During the closure:
•Northbound SR 99 will fully close between the southern end of the Battery Street Tunnel and Valley Street. Traffic traveling through Seattle via SR 99 will be directed to Interstate 5 south of Seattle at East Marginal Way and South Spokane Street. (More information about alternate routes during construction may be found at www.seattle.gov/transportation/mercercorridor.htm.
•Mercer Street will fully close to traffic between Fifth and Dexter avenues North. Traffic heading east towards I-5 will detour to Harrison and Broad streets at Fifth Avenue and will reconnect to Mercer Street at Ninth Avenue North to continue east.
•Eastbound Mercer Street will fully close to traffic between Dexter and Ninth avenues North until approximately 9 a.m. Saturday morning. Travelers heading east from Dexter should take Republican Street to northbound Ninth Avenue to reconnect with Mercer Street.
•No pedestrian access will be allowed on Mercer Street between Fifth and Dexter avenues North during the weekend closure. Pedestrians will need to use the sidewalk on the north side of Broad Street to cross SR 99.
•Southbound SR 99, westbound Mercer Street, Broad Street and the I-5 on- and off-ramps at Mercer Street will remain open during the work.
Early warning signs will be available in advance of the northbound SR 99 lane restrictions. Travelers can expect significant traffic and delays and should plan ahead and use alternate routes.
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