Sound Transit Advances West Seattle Light Rail Plans

The project reached a major design milestone while addressing environmental concerns for a local heron colony.

Updated on Oct. 27, 2026 in Bird Watching

A modern light rail train emerges from a tunnel entrance located next to a dense, mist-covered evergreen forest. — Sound Transit reached 30 percent design completion for the West Seattle light rail extension, securing over $2 billion in projected project savings. AI Illustration. Upload story photo >

Live Poll

Do you support prioritizing wildlife habitat protection over the expansion of local public transit infrastructure?

In July 2026, Sound Transit reached 30 percent design completion for the West Seattle light rail extension. The project includes plans for stations at SODO, Delridge, and Alaska Junction.

Why it matters

The transit agency identified over $2 billion in savings through design changes, such as removing the Avalon Station and increasing tunnel sections. These modifications aim to manage costs while addressing community impacts on local wildlife habitats.

Average bird counts across eight city sites in Seattle declined 21 percent from 2005 to 2023. Meanwhile, the city recorded an 18 percent decrease in the total number of bird species during that same period.

The players

Sound Transit

This is the regional transit agency responsible for planning and building the light rail network across the Seattle metropolitan area.

Washington Department of Fish and Wildlife

This state agency manages fish and wildlife resources and has been coordinating with transit planners on environmental protections since 2020.

The details

Sound Transit has coordinated with the Washington Department of Fish and Wildlife since 2020 to monitor the colony at Pigeon Point. Contractors will be subject to work restrictions during nesting periods, and dedicated monitors will continue to observe the birds as construction plans progress.

Average bird counts dropped 21 percent between 2005 and 2023.
Sound Transit began monitoring the local heron colony in 2020.
The West Seattle extension reached 30 percent design completion in July 2026.
A Great Blue Heron Habitat Management Plan is anticipated in mid-2027.
Major construction and tree removal are scheduled for late 2027 or early 2028.

Culture Shift

This project reflects the ongoing tension between expanding urban infrastructure and the growing movement toward local wildlife preservation in dense city environments. It follows the pattern of established environmental protections like the Great Blue Heron Habitat Management Plan.

Residents in West Seattle should prepare for significant construction activity starting in late 2027, including planned tree removal in areas near the route. These developments represent a shift in the local neighborhood landscape as the light rail extension reaches the next stage of implementation.

The takeaway

Large-scale urban infrastructure projects now require long-term biological monitoring to balance development with environmental conservation. Residents interested in local wildlife should continue to monitor public notices regarding construction timelines and habitat management.

What happens next

A Great Blue Heron Habitat Management Plan is scheduled for release in mid-2027, followed by the commencement of early construction work later that year.