Construction and Traffic Update – Thursday March 7, 2013

SR 99 tunnel boring machine launch pit constructionHighlights

  • Saturday, March 9th: Fairview Ave N. fully re-open to two-way traffic.
  • Saturday, March 9th: Stage 4 of the Mercer East project begins; new lane restrictions on Valley St, Broad St, and Westlake Ave.
  • Friday & Saturday night, March 8th & 9th: Lane closures for paving on Southbound I-5 between NE Ravenna Blvd and the Ship Canal Bridge 10PM to 10AM each night.  NE Ravenna Blvd. on-ramp also closed.
  • March 4th to April 4th: Yesler Wy. closed between Broadway and Boren Ave 24/7. 

This update is also available on the SDOT Website:

For a map of these events, visit:

Full Construction List

Video Survey Work along SR 99

Crews working on the SR 99 Tunnel Project will continue to conduct video survey work documenting the existing conditions of underground utilities along the tunnel route. This work is part of a comprehensive program that will help crews minimize ground movement and protect buildings located above and near the route during tunneling.

On Monday, March 11, through Thursday, March 14, crews will intermittently close travel lanes and some street parking within the boundaries of Stewart Street, Seneca Street, Western Avenue and Second Avenue from 7 p.m. to 5 a.m. each night. Please see the attached flier for more information.

To learn more about the monitoring plan, please take a look at the monitoring program folio. If you have questions or concerns, please contact the program hotline at viaduct[at] or 1-888-AWV-LINE (298-5463).

Nighttime video surveying of utility lines along SR 99 tunnel route

Alaskan Way Viaduct Replacement Program Construction Update – March 2013

Sky cam view of the tunnel boring machine launch pitMilepost 31 Speaker Series – Preparing for the SR 99 tunneling machine’s arrival

 Bertha, the world’s largest-diameter tunnel boring machine, is being shipped from Japan to Seattle this spring. Before she arrives, join us for an engaging discussion about how crews will transport her 40-some pieces from a ship at the Port of Seattle to the 80-foot-deep pit to the west of the stadiums where she’ll begin tunneling this summer. You’ll also get a sneak peek at the support facilities we’re building near the launch pit, including a soil-removing conveyor belt that will stretch a whopping two miles by the end of construction.

 6 to 6:30 p.m.

Thursday, March 7

Milepost 31

211 First Ave. S., Seattle

Admission is free.

 After the talk, be sure to leave enough time to explore the rest of the First Thursday Art Walk in Pioneer Square. Milepost 31 is open Tuesdays through Saturdays from 11 a.m. to 5 p.m., and stays open until 8 p.m. on First Thursdays.  Free parking is available for First Thursday art walk patrons in Pioneer Square. Please visit for more information about participating garages.

And don’t forget you can track Bertha’s journey to Seattle on Twitter by following @BerthaDigsSR99.


Archaeology and the Alaskan Way Viaduct Replacement Program

Kevin Bartoy, Cultural Resources Lead for the Washington State Department of Transportation, recently led a discussion at the Museum of History and Industry’s History Café lecture series. Kevin described how state projects must consider cultural resources and some of the mitigation strategies developed as part of the Alaskan Way Viaduct Replacement Program. Kevin went on to discuss the history of Pioneer Square and SODO, focusing on the changing coastline, historical development and the diversity of uses over time.

To dig into the history of the area and discover how Pioneer Square continues to be a hub of transportation and extreme engineering, visit the project information, Milepost 31, at 211 First Ave. S. A video of Kevin’s lecture is also available on the KCTS website.

For more information about the SR 99 Tunnel Project, visit