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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. Travelers are experiencing road 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.

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.

1st Ave. N. Garage:  The south portion of the west surface lot by the 1st Ave N Garage will be closed through mid-March, while the lot is reconfigured for ADA-compliant parking. If you have questions, please contact Chief Capital Projects Manager Bonnie Pendergrass at (206) 615-1806.

Ongoing, 9am-3pm daily:  NB and SB 5th Ave. N. between Mercer and Thomas Streets, right lane closures.

Wednesday, Feb. 25 – Thursday, March 5, 9pm – 6am, weekdays (excluding Fridays):  Full nighttime closure of Dexter Ave N. between Republican and Mercer streets. Travelers will be detoured to Ninth Avenue N. The work is weather-dependent.

Monday – Friday, 9am – 2pm, through early March:  southbound Dexter Ave N will be reduced to one lane between Roy and Mercer streets.

Monday – Thursday, 8pm – 6am, through the end of March:  Westbound Mercer St will be reduced to one lane between Ninth Avenue N and SR99. Eastbound Mercer St will be reduced to two lanes between SR 99 and 9th Ave N.  This closure will not be in place Friday evenings.

Monday – Thursday, 8pm – 6am, through mid-April:  southbound Dexter Ave N will be restricted to one lane between Roy and Mercer streets.

Beginning March 7, 24/7:  crews building the future north portal of the SR 99 tunnel will close a single lane in both directions of SR 99/Aurora Avenue North between Valley Street and the Aurora Bridge. Two lanes will be open in each direction. Work is planned in two phases.

Phase 1 (approximately 8 weeks): one lane closed in both directions 24/7 for median work.

Phase 2 (approximately 4 weeks): one lane closed in southbound direction for curb work.

  
Through end of February:  5th Ave. N. between Republican and Broad streets will be restricted to one lane in each direction weekdays, from 9 am-3pm. The north, east, and south crosswalks at this intersection at 5th and Harrison streets will be closed to pedestrians. Please follow pedestrian detour signage. 
 
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: http://www.waterfrontseattle.org/seawall.
 
Through winter 2015:  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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