Latest program news

  • Work begins tomorrow on removing Seneca Street off-ramp

    Tomorrow crews will begin removing the Seneca Street off-ramp that looms above Seneca Street between the waterfront and First Avenue. Due to its height and proximity to nearby buildings, the contractor Kiewit will use cranes to bring the ramp’s girders down one by one.

    Crews will remove the ramp working west to east toward First Avenue. Hoe rams will hammer out the road deck before crews cut the ramp’s girders and beams. Cranes will lift the cut pieces one by one onto the ground. Machinery will munch the girders and the ramp’s columns into rubble. Kiewit used a similar approach when removing the Columbia Street on-ramp in February and March.

    Cranes lifting a beam away from the viaduct ramp

    Above: Crews lifting a girder from the Columbia Street ramp that had been cut away with saws

    Expect detours around Western Avenue and Seneca Street

    Kiewit will need to close the intersection of Western Avenue and Seneca Street while removing the ramp above the intersection. Kiewit, WSDOT and SDOT have coordinated closely on the work plan for the ramp’s removal to minimize road closures in the neighborhood. The current closure plan:

    • Wednesday, May 22: Crews begin site prep and slotting the deck near Alaskan Way.
    • Thursday, May 23: Crosswalk across Seneca Street at Western Avenue closes at 7 a.m.
    • Tuesday, May 28: Whole intersection of Seneca Street and Western Avenue closes at 4 a.m., for up to 20 days total.
    • Saturday, June 1: University Street reopens onto Alaskan Way.
    • Mid-June: Ramp fully removed, and site restoration begins.

    Take note: Between Tuesday and Saturday, May 28 – June 1, Western Avenue will be a dead-end street south of Virginia Street. Businesses and sidewalks will be open north and south of Seneca Street, but people walking, biking and driving will need to find alternate paths to cross Seneca Street. See the map below:

    Map showing Western Ave closed at Seneca Street, with detours being Wall Street to north and Spring or Madison to the south

    When University Street reopens on June 1, it will be a connection point between the waterfront and Western Avenue. The intersection of Post Avenue and Seneca Street will also close for up to seven days in late May or early June as crews remove the ramp overhead.

    What to expect from the work

    The contractor’s current plan calls for the ramp to be removed in about three weeks, with crews working only during daytime hours. Buildings adjacent to the work will be protected in the air by nets hung from cranes, and on the ground by barriers. Work hours could change based on crews’ progress, but the planned work hours are:

    • 7 a.m. – 8 p.m. weekdays
    • 9 a.m. – 8 p.m. Saturdays
    • 9 a.m. – 5 p.m. Sundays

    The work will unavoidably produce noise, dust and vibration, but crews will work to mitigate those effects where possible. The process for removing this ramp is benefitting from crews’ experience working on earlier sections of the viaduct, and Kiewit has refined their methods since the project began.

    Follow up work at First Avenue in June

    After the ramp is removed, crews will need to conduct follow-up utility work where the ramp once met First Avenue. Crews will also restore the sidewalk on the west side of First Avenue and build a wall and rail in the hole where the ramp once stood. This work has not yet been scheduled, and may involve night work. We will post more details about this work on our website once the plan is confirmed.

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  • Video: How viaduct rubble is processed for filling the Battery Street Tunnel

    Every day trucks carry viaduct rubble south to Terminal 25 along the Duwamish River for processing. There, rebar is removed, and the concrete crushed into small pieces. The processed rubble is then trucked up to Battery Street to fill the tunnel.
     
    Filling the Battery Street Tunnel from the surface has begun
    Work to decommission the aged and seismically vulnerable Battery Street Tunnel continues as crews fill the tunnel from the surface level. Trucks pour processed viaduct concrete rubble into a hopper (a sort of funnel) placed atop the Battery Street Tunnel’s old ventilation grates. The hopper contains water sprayers and rotates as it pours its contents into the tunnel to prevent dust. Inside the tunnel, the rubble falls into piles which crews spread and then compact with a vibratory roller.  The fill material will be placed and compacted up to about seven feet from the ceiling. 
     
     
    What’s ahead
    Placing the crushed concrete will last about three months. The final seven feet of the tunnel’s interior will be filled with a low-density cellular concrete; this work is scheduled to occur in late 2019 and early 2020. See our earlier post for details about work hours.
     
    Once the tunnel is filled, the vents will be removed and sealed up as part of other surface street restoration work on Battery Street scheduled for summer 2020.
     
    To receive weekly email updates about work on Battery Street, join our mailing list.
     
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    Order: 2.9

  • Lane changes coming on Seventh Avenue North as work zone expands

    Work is progressing on the three blocks of Seventh Avenue North in the South Lake Union neighborhood between Denny Way and Harrison Street. (This stretch of road used to be called Aurora Avenue North.) The North Surface Streets Project will turn what had been highway ramps and the sunken approach to the Battery Street Tunnel into a surface street with north/south bus lanes and signalized intersections at John and Thomas streets.

    Map of Seventh Avenue North showing work areas

    The project is phased to keep vehicles moving on Seventh Avenue North during construction. Next week the work zones will shift to accommodate new areas of construction. These lane configurations will be in place 24/7 for about four weeks. Here are the changes coming May 13 – 14:

    • Overnight closure: Northbound Seventh Avenue North fully closed, 9 p.m. Monday – 5 a.m. Tuesday, so crews can establish new work areas.
    • Lane Shift: Beginning Tuesday, the northbound lane of Seventh Avenue North between John and Harrison streets will be shifted onto new concrete. No turn movements will be affected.
    • Lane reduction: Beginning Tuesday, Seventh Avenue North will be reduced to one northbound lane north of Denny Way.
    • Borealis Avenue narrowed: Borealis Avenue will be tapered down to one lane to accommodate Battery Street Tunnel filling operations and to align traffic with the single lane of Seventh Avenue North that begins north of Denny. The taper will change sides of the street depending on what work activity is being performed. The bus stop will remain open.

    Removing the left lane north of Denny Way will give crews space to dismantle and fill the Battery Street Tunnel’s portal and raise the trench to ground level. Shifting the travel lane at John Street will provide space to work on Seventh Avenue North’s future outside lane between John and Harrison streets. See the map at right (click for larger version).

    Future work

    Later this month, Denny Way will be reduced to one lane in each direction for overnight utility work beneath the street. Later this summer, the contractor will move into the next major phase of the North Surface Streets Project, when Seventh Avenue North's travel lanes in both directions will be shifted into the center of the road so crews can work on the outside lanes.

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  • Filling the Battery Street Tunnel from the surface begins next week

    The decommissioning of the Battery Street Tunnel enters a new phase next week, when the contractor, Kiewit, begins to fill the tunnel from the surface of Battery Street.

    Crews have already cleaned the tunnel of decades’ worth of automobile exhaust and removed the tunnel’s mechanical and electrical systems. They will continue to install sewer lines and conduct other utility work. But starting as soon as next week, the contractor will begin trucking in concrete rubble from the viaduct demolition and sending it into the tunnel using funnels on Battery Street. Crews removed steel rebar from the rubble and crushed the concrete into baseball-sized pieces. 

    Inside the Battery Street Tunnel, with a flat-topped pile of gravel on the left and a yellow tube descending from the ceiling at right

    Caption: The ledge at left is fill material already brought in by truck and compacted to support a new sewer line that will be placed on top. The yellow chute at right is part of the tunnel ventilation system to keep fresh air circulating for workers.

    Inside the tunnel, crews will compact the fill using a vibratory roller. The work will last at least three months as crews fill up to about seven feet from the top of the tunnel.

    Effects of construction

    One lane or sidewalk at a time will be closed on Battery Street between First Avenue and Sixth Avenue, depending on where crews are filling on a given day. The compaction happening inside the tunnel causes vibrations that may be felt on the surface and in adjacent buildings.

    Details of the work and what to expect in May and June:

    • Battery Street reduced to one lane at various locations, 6:30 a.m. – 3 p.m. Monday – Friday.
    • Trucks dumping fill material through a specialized funnel on Battery Street, 6:30 a.m. – 3 p.m. Monday – Friday.
    • Vibration from compaction work inside the tunnel 6:30 a.m. – 5:30 p.m. Monday – Friday.
    • Funnels and other construction equipment stored on Battery Street when not in use.

    People living, working or traveling near the work may see and feel increased noise, dust and vibration during the work hours (weekdays 6:30 a.m. – 5:30 p.m.). The filling operation ends at 3 p.m. to keep Battery Street fully open during the evening commute.

    A truck carrying a load of crushed concrete drives through the tunnel

    Caption: Side-dumping trucks like the one above will deposit fill into funnels on Battery Street.

    The Battery Street Tunnel, like the Alaskan Way Viaduct, is seismically vulnerable. Decommissioning it improves surface mobility by allowing three blocks of Seventh Avenue North (formerly Aurora Avenue North) to be rebuilt into a two-way surface street with four-way intersections and bus lanes. For a weekly email update on Battery Street Tunnel construction progress, join our email list.

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    Order: 3.1

  • Timelapse video: taking down one viaduct span

    If you live, work, shop or travel along Seattle's waterfront, chances are you've stopped to watch large machinery doing downright rude things to the Alaskan Way Viaduct. Contractor Kiewit began removing the viaduct in February, producing dramatic changes along the waterfront: 

    A stretch of the viaduct reduced to rubble with construction machinery atop the rubble in the middle

    Above: Central waterfront demolition as of April 6, 2019

    Demolition happens in a specific sequence, with the roadway deck being punched out first, then the structure's girders and columns being munched into rubble. The rubble on the ground is crunched and sorted, and then hauled away by truck. We captured a timelapse of this process from start to finish: one span being demolished over the course of about a week. 

    Want to watch the process in person? Demolition will continue along Alaskan Way all spring, with active demolition typically occuring 7 a.m. - 5  p.m. on weekdays, with occasional weekend work. You can also follow the progress online via our Twitter feed, SDOT's construction cameras along Alaskan Way, our Flickr photo set, and our own construction cameras which will soon capture the work as it moves north.

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    Order: 3.2

  • Traffic changes coming this Saturday to Seventh Avenue North at Denny Way

    The viaduct isn’t the only part of SR 99’s old downtown route that’s being methodically erased from Seattle’s landscape. Near the intersection of Denny Way and newly renamed Seventh Avenue North (formerly Aurora Avenue North) in South Lake Union, contractor Kiewit is filling in the north end of the Battery Street Tunnel.

    This Friday night, between 8 p.m. and 5 a.m., crews will expand their work zone near this intersection (Google Streetview for reference). Expect lane reductions and closed sidewalks overnight while crews reconfigure traffic lights and set up cones in the intersection of Denny Way and Seventh Avenue North.

    Come Saturday morning, southbound Seventh Avenue North will be narrowed down to one lane between John Street and Denny Way. Southbound drivers approaching Denny Way will no longer be able to turn left onto Denny or Seventh Avenue; your options will be straight onto Wall Street or a right turn onto westbound Denny Way.

    This will be a big change for drivers coming off SR 99 and heading to parts of South Lake Union, downtown or Capitol Hill. Drivers taking the southbound SR 99 off-ramp to downtown will still be able to take a left on Harrison Street. The southbound bus stop on Seventh Avenue North just north of Denny Way will also remain open.

    Map showing no left turn allowed from southbound Seventh Avenue North onto Denny Way

    Above: The North Surface Streets work zone will expand Saturday, April 20. Click for larger version of map.

    The expanded work zone will give crews space to demolish part of the Battery Street Tunnel’s north portal and continue filling in the trench between the northbound and southbound lanes of Seventh Avenue North.

    Rebuilding “Seventh Avenue North”

    Decommissioning, filling and sealing the Battery Street Tunnel allows us to rebuild three blocks of Aurora Avenue North between Denny Way and Harrison Street. When work is complete in 2020, this stretch of road will look like a typical city avenue instead of highway on- and off-ramps. To reflect this change in character, the City of Seattle recently renamed these three blocks “Seventh Avenue North.” The single block of former Aurora Avenue between Denny Way and Sixth Avenue has been renamed Borealis Avenue. (Aurora borealis? Get it? You get it.)

    Kiewit is currently working on the inside, sunken lanes of Seventh Avenue North, which used to be the SR 99 approach to the Battery Street Tunnel. Crews must complete utility work, fill the portal and raise the trench to match the grade of the surrounding land, then pave new travel lanes. Once they complete this work, the travel lanes and work zone will swap places, with traffic on the new inside lanes and crews working on the outside edges of the street.

    This North Surface Streets work is scheduled to be complete in 2020. For updates on road closures in this area, subscribe to our weekly construction email.

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Media requests

If you'd like to schedule an interview with a member of our team, please contact:

Laura Newborn
Media relations, Alaskan Way Viaduct Replacement Program 
206-305-0595
newborl@wsdot.wa.gov