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Sounder Maintenance Base

Image of Sounder Yard and Shops

Sound Transit is building a Sounder maintenance facility at Sound Transit's railroad right-of-way located between Steilacoom Boulevard Southwest and 100th Street Southwest in Lakewood. The new facility allows Sound Transit to efficiently maintain a growing fleet of vehicles, supporting voter-approved capacity expansion projects such as longer trains.

This project was originally designed to maintain the Sounder fleet planned under ST2, a total of 81 rail vehicles. A SEPA Checklist was prepared in 2016 to evaluate impacts of the project. 
Following passage of ST3, which will expand the Sounder fleet up to 106 vehicles by 2040, Sound Transit decided to refine the project to accommodate maintenance of the larger fleet. Changes include increasing the size of the maintenance building footprint to accommodate six bays and 10 repair positions.

Sound Transit released a SEPA Addendum for the expanded project in May of 2018. The Addendum found that no new probable significant adverse environmental impacts would arise. Procurement of a design/build contractor will take place in 2019, and construction is expected to begin in early 2020, with the facility open by 2023.

The Sounder South commuter rail line runs 13 round-trips between Tacoma Dome and King Street Station in Seattle, eight of which serve south Tacoma and Lakewood. Sounder also runs special service to select Seahawks, Sounder and Mariners games. Ridership has grown nearly 30 percent since 2014, with peak period trains now carrying an average of more than 875 people.

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