Tukwila Urban Center Pedestrian and Bicycle Bridge

Tukwila, Washington

Project Size:

Bridge length: 220 feet

Project Status:

Anticipated Completion 2018

Press

Tukwila Urban Center Bridge/LMN Architects

ArchDaily, 08/23/2019

New Bridges in Washington State

ioArch, 09/04/2019

The Green River flows out of the Cascade Mountains through communities in Washington state including Tukwila, a suburban city bordering Seattle at its northern edge. The river is important for salmon spawning and has traditionally been a tribal fishing river in the Pacific Northwest.

The new 220-foot Tukwila Urban Center Bridge is adjacent to Bicentennial Park and crosses the Green River. It has been designed to celebrate the history of the river, protect the local natural habitat, and to create a new pedestrian connection between the commercial district in the west and the eastern part of the city.

The form of the bone-white bridge was inspired by tribal canoes, and is defined by the 45-foot high bowstring arch and the 16-foot wide concrete deck. On the edges of the crossing path the bridge dematerializes and opens to the water flowing below with stainless steel grills to reduce shade and open the surface to sunlight. This design element enhances the natural flow of the river and is important to create a bright welcoming habitat for salmon to swim downstream to the Pacific Ocean, where they grow to become adults.

The simple form of the bridge reflects a balance between the human scale and the scale of the city, and has a monumental presence that creates a new sense of place along the Green River Trail. The bridge is a composition of volumes and forms, and at dawn and dusk is illuminated with LED lighting that can be modulated in different colors and light levels, creating a dynamic play of color.

The new Tukwila Urban Center Bridge conveys simplicity, clarity and lightness. The project is key to implementing the land use and transportation goals of the Tukwila Urban Center Plan and creates a safe and enjoyable walking and biking experience.