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Road Construction & Seattle Center
SR 520, I-90 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. The tunnel boring machine is expected to reach the north end of the SR-99 tunnel in early June, and the tunnel is expected to open in early 2019.
 
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. 

Until SR-99 Tunnel opens to traffic: 6th Ave N is closed between Thomas and Republican streets. Republican St. is closed between Aurora Ave. N and 6th Ave N.
 
Thursday, March 23 at 11pm to Friday, March 24 at 5am:  Eastbound SR-520 closes between Montlake Blvd. and the on-ramp from Lake Washington Blvd. E.
 
Thursday, March 23 and Wednesday, March 29 through Friday, March 31, 9am to 3pm each day: Eastbound Mercer St. between 3rd and 4th Ave. N. is reduced to one lane and the south sidewalk along this stretch of Mercer will be closed.
 
Friday, March 24 to Monday, March 27: Westbound I-90 is reduced to one lane; traffic is detoured to express lanes. The eastbound I-90 express lanes will close at 10pm, then open westbound at 11pm to accommodate I-90 construction work. The lanes will remain westbound into the normal Monday schedule. In addition, the eastbound I-90 exits to northbound and southbound Rainier Ave. S. will be closed. 
 
At some point soon when weather allows:  Southbound SR-99 is closed between Valley and Thomas streets while striping a new right-turn lane to Harrison St.
 
Friday, March 24 and Saturday, March 25, 11pm to 1:30pm each day:  I-5 express lanes between Northgate and downtown Seattle are closed.  Express lanes will open at 1:45pm each day in the northbound direction.
 
Saturday, March 25 at 11:59pm to Sunday, March 26 at 6am: Eastbound SR-520 closes between Montlake Blvd. and the on-ramp from Lake Washington Blvd. E.
 
Sunday, March 26 to Thursday, March 30, 11pm to 5am each night: Eastbound SR-520 closes between Montlake Blvd. and the on-ramp from Lake Washington Blvd. E.
 
Friday, March 31 to Monday, April 3:  The eastbound I-90 express lanes will close at 10pm, then open westbound by 11pm to accommodate I-90 construction work. The lanes will remain westbound into the normal Monday Schedule.
 
Friday, March 31 at 11pm to Monday, April 3 at 5am:  SR-520 will close in both directions between 92nd Ave. NE in Bellevue and Montlake Blvd. 
  
Elliott Bay Seawall Project: Seawall project construction has moved north to between Virginia and Pine streets and adjacent to Pier 62/63. Work between Pine and Union streets wrap up in the early part of this year.   

Staging for this work stretches from Lenora St. to Pike St. Daytime and evening construction will occur. Sidewalk access will be restricted along the west side of Alaskan Way. As part of Waterfront Seattle, construction of the Pier 62/63 Rebuild Phase 1 is expected to begin soon.

For the SR-99 tunnel project, visit www.alaskanwayviaduct.org or call 1-888-298-5463.
King County Metro at www.kingcounty.gov/metro or call 206-553-3000.
Sound Transit at www.soundtransit.org.
Community Transit at www.commtrans.org.
Seattle Center Monorail at www.seattlemonorail.com


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