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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 in February 2019. With it comes the reknitting of Harrison St. across Aurora Ave., creating a new connection between Seattle Center and South Lake Union. The opening of John and Thomas streets will happen in 2020. Please note the tunnel opening requires a three-week fully closure of the SR-99 Viaduct beginning on Jan. 11, 2019. This will be a permanent closure of the Viaduct.
Please note that 1st Ave N. Garage is now closed. Mercer Street Garage, between 2nd and 3rd Avenues North, and 5th Ave N Garage, between Republican and Harrison Streets, remain open for public use.
Arena construction will start soon. For more information on this transformational project, visit: New Arena at Seattle Center.    
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:
Effective Dec. 14: Crews will shorten the southbound right-turn lane to Harrison Street and narrow travel lanes on SR 99 near the SR 99 tunnel’s north portal. This will allow safer and better access to work areas and reduce the schedule risks associated with removing a temporary wall that supports the existing highway.
Saturday, Dec. 14, 5am-4pm: Crews will close two lanes on SR-99 southbound from Roy St. to Denny Way for striping and lane relocation.  
Saturday and Sunday, 7am-5pm, Dec. 15/16 and 22/23:  Harrison St. westbound between Dexter Ave. N. and SR-99 will be closed. 
Jan. 4, 2019: The northbound on-ramp near the stadiums will close. This ramp connects approximately 12,500 vehicles each day from South Royal Brougham Way to northbound SR 99.
Beginning on Friday, Jan. 11, 2019: The SR-99 Viaduct will close for approximately three weeks, and then permanently, to prepare for the opening of the SR-99 Tunnel. Drivers should plan ahead for this period of heightened traffic congestion and allow additional driving time to reach their destinations, especially when driving near morning and evening commute times. Also consider other transportation options, such as Link Light Rail, using Seattle Center Monorail as a convenient connection between the Westlake station and Seattle Center. learn more at:  Seattle Traffic.
Late Jan./Early Feb. 2019: The SR-99 Viaduct will close permanently, and the SR-99 Tunnel will open. Downtown entrances/exits at Seneca Street and Western Avenues will no longer exist. Harrison St. will open across Aurora Ave. N. shortly after tunnel opening for an improved connection between Seattle Center and South Lake Union. Please check back here for updates and information on how these road changes affect access to Seattle Center.        
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