Advisories and Updates

Advisories and Updates

Below is an archive of advisories and progress updates about our work to replace the State Route 99 Alaskan Way Viaduct. An archive of posts featured in our "Program Spotlight" can be found here.

2015

Aug. 25, 2015 - Seattle Tunnel Partners successfully lowers tunneling machine's front end into the access pit

Aug. 24, 2015 - Seattle Tunnel Partners planning to lower Bertha into the access pit today

Aug. 21, 2015 - Motor installation nearly complete

Aug. 18, 2015 - SR 99/Aurora Avenue North closed this weekend near South Lake Union

Aug. 17, 2015 - Reconnecting Bertha’s front end

Aug. 6, 2015 - Preparing to put Bertha back in the access pit

July 28, 2015 - Plan ahead for SR 99/Aurora North weekend closure Aug 21-24 near South Lake Union

July 22, 2015 - Yellow stacks installed at the north portal

July 17, 2015 - Seattle Tunnel Partners submits news schedule for completing SR 99 Tunnel Project

July 10, 2015 - Visit our information booths in West Seattle and Ballard this weekend

July 7, 2015 - A splash of color for the south portal

July 1, 2015 - Summer is the season for Milepost 31

June 5, 2015 - June 5 project update: Installation of new seal system underway

May 29, 2015 - May 29 project update: New parts for Bertha arrive at Terminal 46

May 18, 2015 - May 18 project update: Tunneling machine repairs and the release of new reports

May 8, 2015 - May 8 project update: Latest Dispute Review Board Recommendation

April 6, 2015 - April 6 project update: Disassembly continues

April 2, 2015 - New time-lapse video shows additional perspectives of Bertha lift

March 31, 2015 - March 31 project update: Bertha lift complete

March 30, 2015 - March 30 project update: Lift of Bertha's 2,000-ton front end underway

March 27, 2015 - March 27 project update: Final lift approaches

March 23, 2015 - March 23 project update: Third piece of tunneling machine lifted to the surface

March 21, 2015 - March 21 project update: Second piece of tunneling machine lifted to the surface

March 20, 2015 - Plan ahead: SR 99 closures set for weekend of March 27

March 19, 2015 - March 19 project update: First piece of Bertha removed from the access pit

March 17, 2015 - March 17 project update: Preparing to lift Bertha from the access pit

March 6, 2015 - Postponed: Long-term lane closures on SR 99/Aurora Avenue North

March 3, 2015 - March 3 update: Disassembly begins

Feb. 27, 2015 - Hot Chocolate Run to close a portion of SR 99 on Sunday morning

Feb. 26, 2015 - Feb. 26 update: Bertha's next move

Feb. 20, 2015 - Feb. 20 update: Tidying up the access pit

Feb. 19, 2015 - Feb. 19 afternoon update: Bertha reaches daylight

Feb. 19, 2015 - Feb. 19 morning update: Bertha approaching the pit

Feb. 18, 2015 - Feb. 18 afternoon update: Bertha digs on

Feb. 18, 2015 - Feb. 18 project update: Bertha on the move

Feb. 13, 2015 - Feb. 13 project update: Safety at the forefront

Feb. 13, 2015 - Long-term traffic impacts on SR 99: Lane closures begin March 7 through late May

Feb. 12, 2015 - Incident at tunnel's north portal work zone

Feb. 9, 2015 - Feb. 9 project update: Cradle awaits Bertha's front end

Jan. 30, 2015 - Jan. 30 project update: Access pit excavation complete

Jan. 27, 2015 - Jan. 27 project update

Jan. 22, 2015 - Jan. 22 project update

Jan. 20, 2015 - Nighttime lane closures on SR 99/Aurora Avenue North near South Lake Union

Jan. 12, 2015 - Jan. 12 project update

Jan. 8, 2015 - Jan. 8 project update: Access pit construction progressing

 

2014

Dec. 22, 2014 - Dec. 22 project update

Dec. 17, 2014 - Frequently Asked Questions

Dec. 16, 2014 - Dec. 16 project update

Dec. 12, 2014 - Dec. 12 project update

Dec. 11, 2014 - Dec. 11 project update

Dec. 10, 2014 - Communication efforts on the SR 99 Tunnel Project

Dec. 9, 2014 - Dec. 9 project update

Dec. 8, 2014 - Dec. 8 project update

Dec. 7, 2014 - Dec. 7 project update

Dec. 5, 2014 - Dec. 5 project update

Dec. 4, 2014 - Alaskan Way Viaduct to close overnight Saturday

Nov. 25, 2014 - Nov. 25 update: Access pit camera, dewatering

Nov. 18, 2014 - Nov. 18 update: Access pit camera outage

Nov. 7, 2014 - SR 99 Battery Street Tunnel to close overnight Saturday, Nov. 8

November 3, 2014 - Access pit excavation resumes

Oct. 28, 2014 - Archaeological investigation begins at the access pit

Oct. 28, 2014 - Access pit cameras temporarily disabled

Oct. 23, 2014 - Excavation of access pit temporarily stopped

Oct. 20, 2014 - Access pit excavation is underway

Oct. 19, 2014 - SR 99 fully open through downtown Seattle

Oct. 10, 2014 - Seattle Tunnel Partners lowering groundwater near the access pit

Sept. 8, 2014 - Seattle Tunnel Partners progress update: With pile work done, Bertha inches forward

Aug. 27, 2014 - SR 99 reopens to traffic on time Wednesday

Aug. 26, 2014 - Driver alert: SR 99 closure near South Lake Union continues through Wednesday morning, Aug. 27

Aug. 25, 2014 - Driver alert: SR 99 closure near South Lake Union continues through Wednesday morning, Aug. 27

Aug. 24, 2014 - Driver alert: SR 99 closure near South Lake Union continues through Wednesday morning, Aug. 27

Aug. 23, 2014 - Driver alert: SR 99 closures continue through Wednesday morning, Aug. 27 

Aug. 22, 2014 - Sharing the road during the four-day closure of SR 99 

July 30, 2014 - Early warning: Four-day closure of SR 99 coming in late August

July 28, 2014 - Seattle Tunnel Partners schedule update: Construction of the access pit's underground walls will continue through August

July 25, 2014 - Seafair Torchlight Run to close northbound lanes of the viaduct Saturday evening

July 11, 2014 - How to replace a bridge in four days

July 10, 2014 - Come visit us this weekend at West Seattle Summer Fest and Ballard Seafood Fest

June 18, 2014 - Northbound SR 99 closed through downtown Seattle this weekend

June 16, 2014 - Contractor announces details of repair work plan for the SR 99 tunneling machine

May 30, 2014 - Southbound SR 99 to close through Seattle during the first full weekend in June

May 30, 2014 - Mercer Corridor Project bidding adieu to Broad Street

May 19, 2014 - Three traffic signals out on Alaskan Way

May 16, 2014 -- Planned power outage will affect some traffic signals this weekend on Alaskan Way

May 16, 2014 -- Southbound SR 99 lane, off-ramp closures set for Saturday near Seattle's stadiums

May 13, 2014 -- Construction of access pit's underground walls now underway

May 8, 2014 -- With environmental review complete, access pit construction begins in earnest

April 29, 2014 -- A summary of change orders on the SR 99 Tunnel Project

April 21, 2014 -- SR 99 tunneling machine to resume digging in March 2015

April 18, 2014 -- New photo feature: Before and After

April 18, 2014 -- Overnight on-ramp and lane closure Monday on SR 99/Aurora Avenue North

April 3, 2014 -- Setting the stage for Bertha's repairs

March 31, 2014 -- Milepost 31 Speaker Series on Thursday: Bertha and Progress on the SR 99 Tunnel Project

March 18, 2014 -- Reminder: Follow-up viaduct inspection set for Saturday, March 22

March 13, 2014 -- Seattle Tunnel Partners submits repair plan, archaeological surveys underway

March 13, 2014 -- Construction, St. Patrick's Day Dash to impact traffic this weekend on SR 99

March 10, 2014 -- Follow-up viaduct inspection scheduled for March 22

Feb. 28, 2014 -- A week in review: Bertha repair plan, ERP’s 2014 report and a viaduct weekend closure reminder

Feb. 27, 2014 -- How is an early or late tunnel opening addressed in the design-build contract?

Feb. 25, 2014 -- Ground settlement near the viaduct is safe, expected

Feb. 21, 2014 -- Seattle Tunnel Partners will dig access shaft to reach tunneling machine

Feb. 20, 2014 -- Weekend closure coming to northbound SR 99 lane and ramp near Seattle’s stadiums

Feb. 14, 2014 -- Repair plan to be finalized by the end of February

Feb. 12, 2014 -- Video of Tuesday's news conference

Feb. 10, 2014 -- Accessing the seal system inside the tunneling machine

Feb. 7, 2014 -- Two factors contributed to tunnel stoppage

Jan. 31, 2014 -- Further evaluation required before tunneling can resume

Jan. 28, 2014 -- SR 99 tunneling machine inches forward

Jan. 27, 2014 -- South Atlantic Street overpass open to traffic

Jan. 27, 2014 -- Restart of tunneling machine begins this week; evaluation will follow initial mining

Jan. 23, 2014 -- Hyperbaric investigations continue

Jan. 22, 2014 -- Relief in sight for drivers near the Port of Seattle's busiest freight terminal

Jan. 21, 2014 -- Hyperbaric inspections continue

Jan. 17, 2014 -- Crews begin inspecting excavation chamber

Jan. 16, 2014 -- Working with Seattle Tunnel Partners to resume tunneling

Jan. 16, 2014 -- Tunnel's north access contract awarded

Jan. 14, 2014 -- Diving deeper into the tunneling stoppage

Jan. 13, 2014 -- Filling in shaft number three

Jan. 10, 2014 -- Exploratory shaft work continues

Jan. 9, 2014 -- Still too early to talk timeline

Jan. 8, 2014 -- Crews continue drilling exploratory shafts

Jan. 7, 2014 -- Crews begin drilling shafts in front of Bertha

Jan. 3, 2014 -- Progress made in search for tunnel blockage

 

2013

Dec. 20, 2013 -- We won't know more about Bertha's blockage until 2014

Dec. 13, 2013 -- Tunnel crews lowering groundwater to get a closer look at what's blocking Bertha

Dec. 5, 2013 -- Seattle Tunnel Partners: Almost the proud owners of the world's largest tunneling machine

Dec. 3, 2013 -- Mercer Corridor Project to close SR 99 and Mercer Street next two weekends

Nov. 25, 2013 -- Bertha has much to be thankful for as she nears South Jackson Street

Nov. 14, 2013 -- Bertha takes on the complexities of King Street

Nov. 13, 2013 -- Tunnel and overpass construction to close State Route 99 ramps and lane in SODO this weekend

Nov. 8, 2013 -- State Route 99 to close this weekend through Seattle

Nov. 7, 2013 -- Several days at the dentist: new teeth will give Bertha more bite

Oct. 30, 2013 -- Bertha begins her week of scheduled maintenance

 

Oct. 24, 2013 -- Bertha closing in on King Street

 

Oct. 16, 2013 -- SR 99 tunneling machine passes 300-foot mark

Sept. 30, 2013 -- Alaskan Way Viaduct reopens early, Aurora Avenue North remains closed

Sept. 30, 2013 -- Milepost 31 Speaker Series -- Archaeology and the Alaskan Way Viaduct Replacement Program

Sept. 25, 2013 -- The SR 99 tunneling machine digs again

Sept. 18, 2013 -- Back to work for Bertha

Sept. 12, 2013 -- Mercer Corridor Project: overnight closures of northbound SR 99, eastbound Mercer Street scheduled for Sept. 17

Sept. 4, 2013 -- Thursday at Milepost 31 – Learn about the buildings that support the tunnel systems

Aug. 27, 2013 -- Canceled: Sept. 6-7 closure of northbound SR 99, Mercer Street

Aug. 22, 2013 -- Aurora Bridge lane closures Aug. 24 - 25

Aug. 16, 2013 -- Mercer Corridor Project: Monday and Tuesday Night - Lane restrictions on Fairview Avenue North and I-5 Mercer Street off-ramps

Aug. 14, 2013 -- SR 99 closures for South Spokane Street Overcrossing work Aug. 16 - 17

July 29, 2013 -- Milepost 31 Speaker Series - Tracking Bertha's Progress Beneath Downtown

July 25, 2013 -- Seafair Torchlight Run to close northbound lanes of the viaduct Saturday evening

July 1, 2013 -- Mercer construction to close SR 99, Mercer Street this weekend

June 25, 2013 -- Street and Transit Update – A Waterfront Seattle Event

June 19, 2013 -- Rock ‘n’ Roll Seattle Marathon to close part of northbound SR 99 this Saturday

June 11, 2013 -- Southbound lanes of Battery Street Tunnel to close overnight Thursday, June 13

May 31, 2013 -- Northbound SR 99 on-ramp from South Royal Brougham Way closed Sunday, June 2

May 29, 2013 -- Milepost 31 Speaker Series – Operating the SR 99 tunneling machine

May 20, 2013 -- New Traffic Configuration of SR 99 and Mercer Street Now in Effect

May 13, 2013 -- Major Construction on Mercer West to Begin: Weekend closure of SR 99 and Mercer Street

May 6, 2013 -- Seattle Mother’s Day: Score FREE Parking at Waterfront Garages

May 1, 2013 -- Milepost 31 Speaker Series on Thursday: Preparing for Bertha's Launch

April 26, 2013 -- Elliott Bay Seawall Project: Alaskan Way to be closed this weekend between Virginia to Pike streets

April 18, 2013 -- Overnight lane closures scheduled for SR 99 Battery Street Tunnel week of April 22

April 15, 2013 -- SR 99 lane restrictions to begin Monday, April 22 as part of Mercer Corridor Project

March 28, 2013 -- April 4 Walking Tour: View of the SR 99 Tunnel Launch Pit

March 26, 2013 -- SR 99 off-ramp in SODO closed Easter weekend

March 2, 2013 -- SR 99 Alaskan Way Viaduct open, Aurora Avenue North to close Sunday morning March 3

March 1, 2013 -- Lane reductions on SR 99 near the West Seattle Bridge for Spokane Street Overcrossing Project

Feb. 25, 2013 -- Viaduct to close this weekend for semiannual inspection

Feb. 22, 2013 -- Three blocks of lane reductions on First Avenue in downtown Seattle week of Feb. 25

Feb. 22, 2013 -- Impacts to SR 99 the weekend of Feb. 23

Feb. 15, 2013 -- Lane reductions, parking closures on First Avenue in downtown Seattle week of Feb. 18

Feb. 8, 2013 -- Lane reductions, parking and sidewalk closures on First Avenue in downtown Seattle week of Feb. 11

Feb. 1, 2013 -- Lane reductions on one block of First Avenue in downtown Seattle week of Feb. 4

Jan. 25, 2013 -- Lane reductions on one block of First Avenue in downtown Seattle next week

Jan. 14, 2013 -- SODO overpass work will close State Route 99 on weeknights for next three weeks

 

2012

Dec. 21, 2012 -- Testing time for State Route 99 tunneling machine

Dec. 18, 2012 -- SODO overpass construction closes State Route 99 off-ramp this weekend

Dec. 3, 2012 -- Section of Railroad Way South to close Wednesday and Thursday

Dec. 3, 2012 -- Section of First Avenue South closed Monday and Tuesday

Dec. 3, 2012 -- Milepost 31 turns one

Nov. 27, 2012 -- Nighttime bike/ped path detour this week near Pioneer Square

Nov. 6, 2012 -- Road closures near the SR 99 tunnel's future north portal

Nov. 6, 2012 -- Overnight closures on First Avenue South through Thursday

Oct. 16, 2012 -- Watch us make history

Oct. 16, 2012 -- Section of Sixth Avenue North now closed

Oct. 16, 2012 -- Overnight closures this week on First Avenue South

Sept. 19, 2012 -- Join us today at Seattle Center to see the future of Seattle's waterfront

Aug. 23, 2012 -- Milepost 31 Speaker Series: Protecting buildings during SR 99 tunnel construction

June 5, 2012 -- Long-term lane closure coming to southbound SR99/Aurora Avenue N.

June 5, 2012 -- East Marginal Way S. Reduced to two lanes