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Road Construction & Seattle Center
SR 520 and Alaskan Way Viaduct Update
Mercer Corridor Project
Road construction associated with the Mercer West project is substantially complete, and North Portal construction related to the SR-99 viaduct and tunnel, is ongoing. Please consider the following as you route your way to and from Seattle Center, and allow extra time in your travels during this critical period of transition on our roadways.
If roads around the Mercer corridor are congested, consider other options to access I-5 and SR-99 using entry points south of Seattle Center, along 2nd Ave. and 5th Ave. 
Now into the future: Seattle City Light substation work affecting Denny Way is complete,and Denny Way is fully open in both directions between Stewart St. and Fairview Ave.

Until Further Notice: There will be weekday (6am-2pm) and Saturday lane closures north and southbound along Aurora Ave. N. on the Aurora Bridge during materials staging for the bridge painting project. 

Until SR-99 Tunnel opens to traffic: 6th Ave N is closed between Thomas and Republican streets. Harrison St. is closed between Aurora Ave. N and Broad St. Republican St. is closed between Aurora Ave. N and 6th Ave N.
Friday, Dec. 9 at 9pm to Saturday, Dec. 10 at 5pm: 4th Ave. will fully close between Lenora and Blanchard streets during a large concrete mat pour.
Friday, Dec. 9 at 11pm to Monday, Dec. 12 at 5am:  All lanes and ramps of SR 520 between Montlake Boulevard and 92nd Avenue Northeast are scheduled to close. The SR 520 bicycle and pedestrian path on the floating bridge will also be closed during the weekend closure.

Elliott Bay Seawall Project: Construction work between Pine and Pike streets is underway. This work is scheduled to be complete in mid-2017. The Seattle Aquarium and other waterfront businesses will remain open and access will be maintained at all times. 

Seawall construction between Pine and Pike Streets will remove on-street parking, trees and some sidewalks. Access to the Seattle Aquarium, Waterfront Park and businesses will be maintained. 

As construction expands to the Colman dock area, ferry access for bicyclists and vehicles will shift to Yesler. Please follow the direction of flaggers and signage to access your destination.

For the SR-99 tunnel project, visit or call 1-888-298-5463.
King County Metro at or call 206-553-3000.
Sound Transit at
Community Transit at
Seattle Center Monorail at

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