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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, July 13 at 8pm to Monday, July 16 at 5am: Northbound I-5 will FULLY CLOSE at the West Seattle Bridge, along with all on-ramps between Boeing Access Road and I-90. Entry to NB I-5 will be restricted starting at the Southcenter on-ramps.
Friday, July 13 at 9pm to Monday, July 16 at 5am: the University Street on-ramp to northbound I-5 will close, along with the northbound I-5 off-ramp to Seneca Street.
Friday, July 13 at 11:59pm to Monday, July 16 at 5am: Southbound I-405 general-purpose off-ramp to northbound I-5 will be closed.

Saturday, July 14 at 2pm to 12 noon on Sunday, July 15: Southbound I-5 will be reduced to two lanes across the Ship Canal Bridge. The Northeast 45th Street on-ramp to southbound I-5 will also close.
Thursday, Aug. 2 – Sunday, Aug. 5: The mainlines of I-90 will be closed between I-5 in Seattle and Island Crest Way on Mercer Island for Seafair Air Shows at the following times: Aug. 2: 9:45am-12:15pm and 1pm-2:45pm; Aug. 3, 12:55pm-2:45pm; Aug. 4, 12:55pm-2:45pm; and Aug. 5, 12:55pm-2:45pm.
Friday, August 10 at 9pm to Monday, August 13 at 5am: There will be a partial closure of northbound I-5 between S. Michigan St. and Downtown. The westbound I-90 off-ramp, I-90/Edgar Martinez Drive and Seneca St. off-ramps to northbound I-5 will close, along with the Dearborn and University street on-ramps to northbound I-. This work is weather dependent. 
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