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Transportation Updates
What you need to know to avoid traffic tie-ups on your way to and from Seattle Center.
Mercer Corridor Project
There’s light at the end of the SR-99 Tunnel. It will open by Thanksgiving this year. With it comes the reknitting of Harrison St. across Aurora Avenue, creating a new connection between Seattle Center and South Lake Union. The opening of John and Thomas streets will need to wait for a couple years. Please note that the tunnel opening requires a three to four-week closure of the SR-99 Viaduct, which we expect will happen in October or November.
To avoid traffic slowdowns, consider all transportation options as you route your way to and from Seattle Center. Several Metro bus routes serve the Center, and Seattle Center Monorail provides a speedy connection between Seattle Center and the Sound Transit/Metro Station at Westlake. Here is what to expect in the upcoming weeks:
6th Ave N is closed between Thomas and Republican streets. Republican St. is closed between Aurora Ave. N and 6th Ave N. Southbound SR-99/Aurora exit and entry to Harrison St. is now open!
Friday, Sept. 14 at 11:59pm to Sunday, Sept. 16 at 11:59pm: Southbound SR-99 will be closed between the Battery Street Tunnel and S. Spokane St.
Friday, Sept. 14 at 8pm to Monday, Sept. 17 at 5am: There will be a partial closure of  northbound I-5 through downtown Seattle, between MLK and Olive Way with one lane funneled into the express lanes and the other into the collector distributor.
Friday, Sept. 21 to Saturday, Sept. 22, times TBA: Wall St. will be closed between 6th Ave. and Denny Way for a construction crane installation.
Friday, Sept. 21 time TBA to Monday, Sept. 24 at 5am: SR-99 will be closed in both directions from the south end of the battery Street Tunn to S. Spokane St.    
Waterfront Construction: Traffic on Alaskan Way S./Alaskan St. is shifted to beneath the Viaduct between S. King St. and Pike St. Traffic is shifted to the east side of Alaskan Way between Pike and Virginia streets.Vehicle, pedestrian and bike ferry access is affected, so heed to the directional signage. Seawall construction stretches from Pike to Virginia Street. Daytime and evening construction will occur. Sidewalk access will be restricted along the west side of Alaskan Way. Access to Seattle Aquarium, Waterfront Park and businesses will remain open.

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Seattle Center Seattle Center creates exceptional events, experiences and environments that delight and inspire the human spirit to build stronger communities. City of Seattle
Jenny A. Durkan, Mayor, City of Seattle
Director Robert Nellams, Seattle Center, 305 Harrison Street, Seattle, WA 98109