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Mercer Corridor Project, SR 520 and Alaskan Way Viaduct Update
Mercer Corridor Project

We are in an active period of road construction around Seattle Center (and in the region). Travelers are experiencing MAJOR CORRIDOR CHANGES associated with the Mercer Corridor Project.

Please take into account 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.


*   Mercer St. is fully open to two-way  traffic between I-5 and Elliott Ave. W.
*   Roy St. is open to two-way traffic between 5th Ave. N. and Queen Anne Ave. N. If you           experience traffic congestion along Mercer St., please consider Roy St. as an alternative route. Queen Anne Ave. N. is open to two-way traffic between Roy St., and Mercer St. 
*   Broad St. between 5th Ave. N. and Mercer St. is CLOSED permanently.
For pedestrian and bicycle routes through the road construction area, please click here: Mercer West BikePed Map 9.22.14
5th Ave. N. Garage:  Harrison St. and Republican St. entrances/exits remain open, with access from northbound and southbound 5th Ave. N. Mercer Garage:  3rd Ave. N. and 4th Ave. N. entrances/exits remain open (4th Ave. open for events only), with a designated left turn lane from eastbound Mercer St. onto 4th Ave. N.
Ongoing, 9am-3pm daily:  North and southbound 5th Ave. N. between Mercer and                   Republican Streets, right lane closures.
Through June 30, 2015:  Work begins on the Elliott Bay Seawall between Pike and Madison streets,  temporarily closing businesses on Piers 54, 55 and 56, removing on-street parking west of the viaduct and shifting ferry access to the south of Madison St. Learn more at: www.waterfrontseattle.org/seawall.

Friday, Oct. 17 at 10pm to Monday, Oct. 20 at 5am: SR-99 closes in both directions between the south end of the Battery Street Tunnel and Valley St.

Friday, Oct. 17, at 11pm to Monday, Oct. 20 at 5am:  Crews will close both directions of SR-520 between Montlake Blvd. NE and I-405.

Saturday, Oct. 18 and Sunday, Oct. 19, 6am to 6pm, each day:  Crews will close both directions of SR-99 between South Spokane Street and the south end of the Battery Street Tunnel.

Friday, Oct. 24 to Saturday, Oct. 25:  There will be a full closure of both directions of I-5 between SR 599 to Boeing Access Road from 11:59pm to 6am. Saturday is back up in case the work does not get completed.

Through Fall 2014: Only one lane in each direction of Dexter Ave. N between Thomas and Roy streets remains open. Harrison St. is closed between SR-99 and 8th Ave. N. A  separate bike lane is maintained on Dexter Ave. N during peak commute hours. Cyclists might be directed to merge with traffic during off-peak hours. Street  parking is closed in the work zone, and Metro bus stops are relocated to near Thomas St. 

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. More information about alternate routes during construction may be found at: http://www.seattle.gov/transportation/mercercorridor.htm 
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.  

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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