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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. Work 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 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 during the month of April:
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!
Through end of April, 9am-3pm daily, intermittently: The Westbound right lane and adjacent sidewalk between Stewart St. and Minor will close for installation of site improvements for the Denny Substation.
Friday, April 13 at 11pm to Monday, April 16 at 5am: the University St. on-ramp to northbound 1-5 will be closed.
Saturday, April 14, 11:30am-2pm: 5,000 are expected for the March for Science, which starts at Cal Anderson Park and marches to Seattle Center, creating rolling street closures along the route: 11th Ave. and E. Pine St, west on Pine to 4th Ave.; north on 4th to Cedar St.; north on Cedar to 5th Ave. N.; north on 5th to Harrison St.; west on Harrison to the Seattle Center campus. About 5,000 people are expected to participate.
Monday, April 16 to Monday, April 23, 24/7: The north half of Thomas St. between 6th Ave. N. and Taylor Ave. N. will close during roadway restoration work.
Weekends of April 20 and April 23, from Fridays at 11pm to Mondays at 5am:  Northbound I-5 will be reduced to two lanes between S. Michigan St. and downtown.    
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