Heavier than normal traffic is forecast for I-5 through Seattle and I-405 east of Seattle during the shutdown. Highway 99 will close at 7:30 p.m. on Oct. 21 until 5 a.m. on Oct. 31.
The northbound segment from the West Seattle Bridge to near the Port of Seattle will be closed the entire period, while northbound from Safeco Field to Battery Street Tunnel will be open weekdays and weekends for sports events at CenturyLink Field.
Southbound 99 from the Battery Street Tunnel to the West Seattle Bridge will be closed the entire time. Workers will create a four-lane detour that will be used until a new stadium-area interchange is built.