press release:
The contractor working for the Seattle Department of Transportation to widen the Spokane Street Viaduct will close the structure’s westbound lanes just west of I-5 for three nights: August 16, 17 and 18. On August 16 and 17 crews will start work at 11:30 p.m. and on August 18 work will begin at 10 p.m. In each instance the roadway will re-open by 5 a.m. the next morning.

During this work, southbound I-5 traffic will be directed to the S Forest Street exit to access surface streets. Northbound I-5 traffic and westbound traffic from Columbian Way will be detoured to surface streets at 6th Avenue South. Motorists will still be able to access West Seattle from southbound SR-99.

Also, on August 15 the right lane of the westbound Spokane Street Viaduct will be closed overnight, from 11:30 p.m. to 5 a.m. the next morning. The I-5 westbound ramps will remain open.

See www.seattle.gov/spokane for more details on this project.