May 26, 2017

Highway and transportation
$5 million-$15 million

Photo courtesy of PCL Construction Services

The project required working on an elevated structure spanning a busy four-lane street.

Angle Lake Station

Location: SeaTac

Sound Transit’s Angle Lake Station is an elevated center-platform station spanning South 200th Street, providing access from both sides of the street.

Stainless steel and concrete finishes throughout a majority of the station provide for ease of maintenance and improve longevity. The lower plaza is finished with landscaping, pavers and colored concrete.

The platform is accessible by way of elevators, escalators and stairs. Riders on the platform are protected from the elements by wave-shaped canopies with metal soffits.

Constructing the station was complex because it required working on an elevated structure spanning an active four-lane street, and working in between two elevated guideway sections of segmental bridge structure. This bridge structure supports the light-rail tracks and is independent from the station’s boarding platform.

The project team successfully overcame several challenges:

• Constructing 13,000 square feet of elevated deck and tile finish, built with 1 percent slope in two directions

• Fabrication and installation of the wave canopy

• Concealment of the fire protection system at the platform canopy: The owner wanted to conceal the electrical- and fire-protection infrastructure at the platform while keeping the assembly streamlined and open. After some trial and error, a design for both systems was confirmed that would offer concealment of the fire protection and rainwater drainage.

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