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Airport Way South Viaduct Over Argo Railroad Yard Rehabilitation Project: Past Updates

October 29, 2012

We can see the light at the end of the tunnel or perhaps it’s across the bridge! Continuous progress is being made towards completion of the Airport Way South Viaduct (AWSV).  The bridge is expected to open to traffic by the end of the year.
Highlights of work currently underway are:

  • The Structural Earth Wall Approaches are currently being finished on the south while the completed north approach is being utilized for setting the precast concrete girders.
  • After the precast girder setting is complete, the concrete bridge deck will be poured.
  • The main span steel structure rehabilitation, which is a major milestone, has been complete! This includes the installation of floor beams and through girder stiffeners.
  • The existing concrete column rehabilitation is also complete.  All of the concrete spalls are fixed and columns have been sealed with a protective sealant. 
  • Various drainage work is ongoing.  Paving will be scheduled in and around the project site, once the drainage work is complete.

Photo ‘Columns’ Description- View of the rehabilitated mainspan columns.  After spall repairs and an application of a concrete sealant, they look brand-new!

Photo ‘Precast Concrete Girders’ Description- The precast girders are being set on the mainspan by the Contractor’s crane which is mobilized on the mainspan. 

Photo ‘N Approach’ Description- View of the South Approach, looking north.  Progress is being made on the approaches by utilizing heavy equipment- transporting and properly compacting the Structural Earth fill.

Photo ‘Wall.’ Description- View of the west side of the south approach.  You really get a sense of how large the volume of fill, the approach really contains!

Detour Information:

  • Southbound vehicles & pedestrians will be detoured at South Industrial Way to 4th Avenue South, returning to Airport Way South via South Lucile Street.
  • Southbound cyclists will be detoured at South Lander Street to 1st Avenue South returning to Airport Way South via South Lucile Street.
  • Northbound vehicles & pedestrians will be detoured at South Lucile Street to 4th Avenue South, returning to Airport Way South via South Industrial Way.
  • Northbound cyclists will be detoured at South Lucile Street to 1st Avenue South returning to Airport Way South via South Lander Street.
  • Denver Avenue South and South Dawson Street between South Lucile Street and 4th Avenue South will be used primarily as a northbound truck detour route
  • Signage will be placed throughout the region to alert users of the viaduct closure and detour routes.

A map of the detour route can be found here.

Transit:
Bus routes that currently use the Airport Way South Viaduct will be rerouted to 4th Avenue South during the closure. Transit agencies will communicate any route changes to customers directly.


Revised 10/10/12

We can see the light at the end of the tunnel or perhaps it’s across the bridge!  Per the plan, our contractor will wrap this job up before the end of the year.  Stay tuned for more good news.

Project Update/Construction Update – August 2012

Airport Way S. Viaduct Project– Continues to make significant progress. Reopening of the viaduct and significant completion of the project is expected by the end of the year.  Recent highlights of work include continued mainspan rehabilitation with ongoing installation of through girder stiffeners and epoxy concrete bearing pads.  The ground work at the North and South approaches is complete; this includes the Deep Soil Mixing (DSM)- soil strengthening as well as the concrete distribution slab work. The contractor, Mowat Construction, continues to cast diaphragms onto girders in the Port of Seattle E. Marginal Way Yard.  The girders will be delivered and installed on the main span when the steel preparation is complete. Finally, the Mechanically Stabilized Earth (MSE) wall work begins on the North approach with 2 shifts, beginning early this week.  South approach MSE wall work is planned to begin in late August.

Photos depicting the work described above are provided below, however questions are always welcome.

South Approach- Aerial view from the South Approach looking North.  Shows overall project site as well as the ongoing mainspan work.

Diaphragm Casting- Ongoing diaphragm casting of the precast concrete girders on the Port of Seattle East Marginal Way Yard.

Distribution Slab- View of the North Approach looking south.  This concrete distribution slab is what the new approach (Mechanically Stabilized Earth Structure) will be built upon.

MSE Wall Construction- View of the North Approach looking south.  This concrete distribution slab is what the new approach (Mechanically Stabilized Earth Structure) will be built upon.

Revised 7/10/12

Project Update/Construction Update – July 2012

Work to rehabilitate the Airport Way South Viaduct continues to make significant progress. Recent highlights of work include the completion of the structural steel for the mainspan as well as concrete column patching. Mainspain painting, which was completed in June, included sandblasting the top of floorbeams, preparatory painting and priming and finally the application of the top coat. The contractor has nearly completed the ground improvements to the north approach and has begun the south approach improvements.

Crews are currently casting the t-girder diaphragms at Mowat’s E. Marginal Way job site.  The girders will be delivered and installed on the mainspan when the mainspan steel preparation is completed.


View of the mainspan (looking north) with the concrete deck removed.


View of the pile driving work on the north approach.


Deep Soil Mixer strengthening the existing soil utilizing a cement-soil mix.


Revised 4/20/12

Project Update/Construction Update - April 2012

Work to rehabilitate the Airport Way South Viaduct continues. Highlights of work currently underway are:

  • Ground improvements are close to being finished on the north approach. There is a preliminary plan of bringing in a second rig for the south approach work in favor of a new method of ground improvements.
  • Preparation of the existing main span steel structure was recently completed so that cleaning and painting of the members can take place.
  • The existing main span steel structure is also being prepared and is ready to begin undergoing seismic retrofit. The retrofit will involve strengthening the steel structure by attaching additional steel members to the existing main span.
  • The concrete columns on the main span will be patched to eliminate any existing concrete spalling.
  • For the past three weeks, the main span concrete deck girders have been undergoing casting at the Tacoma Precast Plant of Concrete Technology Corporation. You can see a walk around of the first finished piece on YouTube. This is piece number one of more than 200 pieces that will need to be cast in Tacoma and shipped to the Seattle project site. Then, each of the concrete pieces will be placed on the structure creating the finished bridge deck.

Click to Enlarge Image Click to enlarge image

Detour Information:

  • Southbound vehicles & pedestrians will be detoured at South Industrial Way to 4th Avenue South, returning to Airport Way South via South Lucile Street.
  • Southbound cyclists will be detoured at South Lander Street to 1st Avenue South returning to Airport Way South via South Lucile Street.
  • Northbound vehicles & pedestrians will be detoured at South Lucile Street to 4th Avenue South, returning to Airport Way South via South Industrial Way.
  • Northbound cyclists will be detoured at South Lucile Street to 1st Avenue South returning to Airport Way South via South Lander Street.
  • Denver Avenue South and South Dawson Street between South Lucile Street and 4th Avenue South will be used primarily as a northbound truck detour route.
  • Signage will be placed throughout the region to alert users of the viaduct closure and detour routes.

A map of the detour route can be found here.

Transit:
Bus routes that currently use the Airport Way South Viaduct will be rerouted to 4th Avenue South during the closure. Transit agencies will communicate any route changes to customers directly.


Revised 2/07/12

Project Update/Construction Update – February 2012

The Airport Way South Viaduct was closed to traffic on November 28, 2011. It is estimated to be fully closed to all vehicles, bicycles and pedestrians for 12-14 months. During this time the mainspan will be rehabilitated and receive seismic improvements, and the existing timber frame approaches will be replaced with mechanically stabilized earth (MSE) wall structures.

Detour Information:

  • Southbound vehicles & pedestrians will be detoured at South Industrial Way to 4th Avenue South, returning to Airport Way South via South Lucile Street.
  • Southbound cyclists will be detoured at South Lander Street to 1st Avenue South returning to Airport Way South via South Lucile Street.
  • Northbound vehicles & pedestrians will be detoured at South Lucile Street to 4th Avenue South, returning to Airport Way South via South Industrial Way.
  • Northbound cyclists will be detoured at South Lucile Street to 1st Avenue South returning to Airport Way South via South Lander Street.
  • Denver Avenue South and South Dawson Street between South Lucile Street and 4th Avenue South will be used primarily as a northbound truck detour route.
  • Signage will be placed throughout the region to alert users of the viaduct closure and detour routes.

A map of the detour route can be found here.

Transit:
Bus routes that currently use the Airport Way South Viaduct will be rerouted to 4th Avenue South during the closure. Transit agencies will communicate any route changes to customers directly.


revised 9/19/11

Project Update/Construction Update – September 2011

The Seattle Department of Transportation (SDOT) and its Contractor Mowat Construction have begun work on the paving portion of the Airport over Argo contract and continue preparations to close the bridge. The closure of the bridge is expected to happen after design and railroad coordination have been completed, long lead materials have been ordered and after the 9-day Alaskan Way Viaduct closure in late October.

The bridge is now expected to be closed in early November. Details will continue to be updated as dates are confirmed however, there will be a minimum two week notice to the community before closure of the bridge.

Once the bridge closes, all vehicles, bicyclists, and pedestrians will be detoured to 4th Ave South. The map of the detour route can be found here.

Airport Way S Construction Update – September 2011
As part of this bridge rehabilitation project Airport Way S between S Lucile and S Hardy streets will be repaved.  The work began July 21, 2011. For more information on the paving construction click here.

Project Update/Construction Update - June 2011
The Seattle Department of Transportation (SDOT) has awarded the Airport Over ARGO Bridge Rehabilitation project to Mowat Construction.  SDOT and Mowat Construction Company are currently working to determine a construction start date. 

  • The bridge is expected to be closed for construction beginning in August
  • Construction will require a full closure for approximately 12 - 14 months
  • All vehicles, bicyclists, and pedestrians will be detoured to 4th Avenue South.  The map of the detour route can be found here

More details will be made available as they are confirmed. 


Want to Learn More?
For the latest news and information, contact:

Ken Lee
Project Manager
(206) 684-3514
ken.lee@seattle.gov

Maribel Cruz
Project Communications
(206) 684-7963
maribel.cruz@seattle.gov

Bob Derry
Community Communications Officer
(206) 250-2865
bob@stephersonassociates.com


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