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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 reached the north end of the SR-99 tunnel in April and is being disassembled. The tunnel is expected to open in early 2019.
Please 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. If driving, please 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.
Southbound SR-99/Aurora exit and entry to Harrison St. is now open!

Lane Closures, May 8-June 10, 9pm to 5am nightly: Both westbound lanes of Denny Way will be closed between Monday night and Saturday morning. A signed detour route will be provided via Stewart St. and Boren Ave.  
Beginning on June 3: New HOV lanes on east and westbound mainline I-90 will open the weekend of June 3. At the same time, the I-90 express lanes will permanently close to allow construction of Sound Transit's East Link light rail extension from Seattle to Redmond. The new lanes will create continuous HOV accommodation between Seattle and Issaquah.

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 or call 1-888-298-5463.
King County Metro at or 206-553-3000.
Sound Transit at
Community Transit at

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