Mercer construction to close SR 99, Mercer Street this weekend

Posted on Jul 1 2013 10:55 AM

The City of Seattle’s Mercer Corridor Project will fully close a section of State Route 99 and Mercer Street from midnight Friday, July 5 through 5 a.m. Monday, July 8. The closures will allow crews to demolish the eastern side of the SR 99 bridge over Mercer Street.

Closure details

SR 99 will be fully closed between Valley Street and the southern end of the Battery Street Tunnel. Information about alternate routes during construction is available at

Mercer Street will be fully closed to traffic between Fifth Avenue North and Dexter Avenue North. Traffic traveling east toward 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.

The I-5 on- and off-ramps at 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. Travelers can expect significant traffic and delays, and should plan ahead and use alternate routes. Visit the Mercer Corridor Project page to learn more.