Project update: Tacoma Trestle Track and Signal Project

Nov 2, 2016

Fall 2016 Tacoma Trestle Track and Signal Project update

Trestle construction 

In November, the initial phase of pile driving will be wrapping up for the construction of the south half of the new trestle. The majority of the piles have been driven into the ground. These piles allow for the building of the concrete footings for the structure of the trestle.

Tacoma Trestle construction overview.

The final section of piles is located at the intersection of East 'G' and East 26th Street. Due to its close proximity to the Tacoma Public Utilities substation, there has been close coordination between the two groups so that the pile driving can take place.

While visiting the Dome District area, you may have noticed that the new trestle is beginning to take formation. Currently, Sound Transit's contractor is about three-quarters through the first stage of construction of the pilings, footings and columns. This section of the trestle is called the sub-structure of the trestle.

Once the sub-structure is built, the contractor will begin installing the super-structure for the trestle which will include elements such as cement girders, ballast, and track material. 

Street closures

The most impactful street closure for the Tacoma Trestle project is the closure of E 'G' Street to through traffic underneath the existing steel girder bridge.

Tacoma Trestle road closure map.

Now through the end of the year, Sound Transit will build one half of a steel girder bridge that will slide into the trestle, over the intersection of East 'G' and East 26th Street. Due to safety, this intersection will be closed during this time. After phase 2 is complete, the existing trestle bridge will be demolished; this requires a closure of this intersection. Finally, the final phase of pile driving will begin for the north half of the Tacoma trestle bridge. Our contractor will be starting at the west side of the trestle, and will then be working their way east.

With the accumulation of all these construction impacts, it is our goal to mitigate the duration of this closure by closing the intersection of East 'G' and East 26th Street until the above mentioned work has taken place. Flatiron is estimating that this intersection should be re-opened to through traffic around spring 2017.

The best way to stay up-to-date with construction is to sign up for the Tacoma Trestle email alert list. This is how we share notifications regarding street closures and construction impacts.

What is coming up next?

Tacoma Trestle concrete girders.

Phase 2: 1st Quarter - 2017

The next phase of the Tacoma Trestle project will occur this winter once the south half of the trestle is built and will be ready to support Sounder service. The steel girders that will support the trestle bridge over the intersection of East 'G' street will be installed approximately five feet off of the current structure. When this work is complete, the steel girders will slide into place and be permanently affixed to the new trestle. 

Phase 3: 1st Quarter – 2017

The next step in the Tacoma Trestle project will be the demolition of the old trestle. This phase is anticipated to occur during early 2017. Also included is construction of a new south platform and extension of the existing north platform.

Phase 4: 2nd Quarter through the 4th Quarter - 2017

The final phase of construction will begin with a second round of pile driving. The pile driving for phase 4 will be for the construction of the north half of the new trestle. Construction of this half of the trestle is anticipated to last for 6-8 months, with final completion expected by the end of 2017.