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

We remain 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.
 
Changes along the Mercer Corridor:  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 parking permits and McCaw Hall events). Please take advantage of the designated left turn lane from eastbound Mercer St. onto 4th Ave. N. as an alternative to accessing the garage at the 3rd Ave. N. entrance.
 
Ongoing, 9am-3pm daily:  North and southbound 5th Ave. N. between Mercer and Republican Streets, right lane closures.
 
Through mid-December:  5th Ave. N between Republican and Broad streets will be restricted to one lane in each direction weekdays, from 9 a.m. until 3 p.m. The north, east, and south crosswalks at this intersection at 5th and Harrison streets will be closed to pedestrians. The crosswalk on the west side of the intersection will remain open. Please follow pedestrian detour signage. 5th and Harrison Sidewalk Closure and Detour Map.
 
Through June 30, 2015:  Work continues 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.
 
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.
 
Saturday, Nov. 29, 7am-12pm:  Seattle Kids Marathon and 5K will close lanes and streets around Seattle Center. All Races (5K, Kids Marathon and Seattle Marathon) start on 5th Ave. N. near Harrison St. and end in Memorial Stadium. 12,000-20,000 participants are expected over the two days. Please refer to the course maps for details: Kids Marathon: http://www.seattlemarathon.org/downloads/kids/kidscoursemap.pdf. 5K http://www.seattlemarathon.org/downloads/5k/5kcoursemap.pdf.
 
Sunday, Nov. 20, 5am-4pm:  Seattle Marathon will close lanes and streets around Seattle Center. Please see the course map for street and neighborhood impacts:  http://www.seattlemarathon.org/downloads/marathon/coursemap.pdf
 
Saturday, Dec. 6 at 4am - Monday, Dec. 8 at 5am:  Both directions of 5th Ave. N. between Thomas and Harrison streets will be fully closed. The sidewalk on the east side of 5th Ave. N. will also close. Vehicles will use Broad St. and Harrison to detour around the one-block street closure.   
 
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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