Item No.       7b_supp 
Date of Meeting May 10, 2011 

Alaskan Way Viaduct & Seawall Replacement Program 


Organization DRAFT Program Oversight Committee 
Port of Seattle Commission 
Date June 3, 2010 
May 10, 2011 

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Presentation Topics 
Construction coordination 
Keeping people and goods moving during construction 
S. Spokane Street Viaduct Widening Project update 
S. Holgate Street to S. King Street Viaduct Replacement
Project update

Construction Coordination Goals 
No surprises.                Identify potential conflicts. 
Maintain public trust.            Keep users (bicycles, pedestrians,
transit, freight, drivers) moving. 
Agencies continue to work 
together.                     Maintain business and resident
access. 
Coordinate work to minimize
impacts to the public.            Build upon past experience.

Keeping People and Goods Moving During
Construction 
Roadway improvements: SR 519 and Spokane Street Viaduct Fourth
Avenue off-ramp. 
Transit investments: Added bus service and strategies to encourage
transit, carpools and vanpools. 
System reliability: New electronic and travel time signs on I-5; and new
electronic message signs on SR 99 and other routes to downtown. 



Increased service from West Seattle.      Driver information signs on I-5.

S. Spokane Street Viaduct Widening Project 
Completed construction of new eastbound off-ramp at Fourth
Avenue S. and opened to traffic in August 2010. 
New westbound on- 
and off-ramp at First
Avenue S. is
scheduled to open
fourth quarter of 2011. 

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Construction Coordination Activities 
Coordinate and communicate daily on
construction activities. 
Ensure access for all modes
(pedestrians, bicycles, freight, transit,
ferry riders, event attendees and
vehicles). 
Plan coordination approach up to three
years in advance. 
Predict location, duration and type of
road closures. 
Reduce conflicts and minimize traffic
and business impacts. 
Proactively engage media with latest
information.

S. Holgate to S. King Viaduct Replacement 
Before construction                      December 2013 




STAGING AREA             CONTINUING CONSTRUCTION 
Roadway will be complete in 2013. 
SR 99 remains open during construction. 
Reduced capacity on SR 99 south of S. King Street. 
South end viaduct demolition in early 2012.

Demolishing the SR 99 On-ramp

Alaskan Way S. Closure 
Alaskan Way S. closed in both
directions between S. Atlantic
Street and S. Royal Brougham
Way. 
Closure in place until at least
2013. 
Allows relocation of BNSF
railroad tail track to opposite
side of street and completion of
bypass bridge. 
Ongoing coordination with Port
and stakeholders.

Alaskan Way S. Closure 




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Building the SR 99 Detour

Driving Piles for the New SR 99 Roadway 
Currently driving piles for
new SR 99 southbound
roadway. 
Starting in mid-May,
crews will work in close
proximity to the existing
viaduct. 
Will reduce lanes on
SR 99 between West
Seattle Bridge and
S. Royal Brougham Way
to allow for this work.

Reducing SR 99 to Two Lanes in Each Direction 
Two northbound lanes, and a transit-only northbound lane. 
Two southbound lanes. 
May 14-15 viaduct closure to reconfigure. 
SR 99 configuration will remain in place until 2013 and possibly
longer, until the central waterfront segment of the viaduct is
replaced.

Reducing SR 99 to Two Lanes in Each Direction 




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Alaskan Way Viaduct and Seawall Replacement Program 
Website: 
www.alaskanwayviaduct.org 
E-mail: 
viaduct@wsdot.wa.gov 
Hotline: 
1-888-AWV-LINE

Back Pocket

Travelers Information Map

WSDOT Seattle Area Traffic Map