Highway 99 and Mercer Street between Fifth Avenue North and Dexter Avenue North will be closed from 11:59 p.m. Friday through 5 a.m. Monday for construction associated with the west phase of the Mercer Corridor Project, according to the Seattle Department of Transportation.
Project crews will demolish the east side of the state Route 99 bridge over Mercer Street.
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 Interstate-5 north of Seattle at 85th Street or south of Seattle at East Marginal Way and Spokane Street.
- Mercer Street will be fully closed to traffic between Fifth Avenue North and Dexter Avenue North. Traffic heading 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.
- 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 Interstate 5 ramps at Mercer Street and Broad Street will remain open. Travelers should expect significant traffic delays, according to SDOT.