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February 5, 2021

Best in State: Gold award — Social, Economic and Sustainable Design
Parametrix

Photo courtesy of ACEC
The 110-foot-long pedestrian bridge was pre-manufactured in Minnesota and trucked cross country in a single piece. It was placed by crane in a single afternoon.

Project: Lake to Sound Trail, Segment A
Client: King County Parks

The Lake to Sound Trail is a sustainable, long-term solution to the community’s non-motorized transportation needs by building access across many physical, environmental, legal and safety constraints. The completion of Segment A, a 1.1-mile-long section, fills an essential missing link within the overall corridor, navigating natural and built environment barriers such as rivers and major railroad lines.

Parametrix was responsible for project management, design of the trail, civil and structural engineering, landscape architecture, surveying and construction management.

Two crossings in this project created unique and complex design challenges. Within a short distance, the trail needed to cross both the Black River and Monster Road. Many factors added difficulty to the design, including structural constraints of the existing road bridge, vertical clearance area for the undercrossing, environmental constraints such as ordinary high water and flood elevations of the Black River, the occurrence of listed aquatic species, and seismic instabilities at the riverbank. Designers determined a new pedestrian-only structure was needed for the river crossing.

This completed project, one piece of a larger multi-phase connection of a network of trails, is the result of extensive outreach with a wide variety of stakeholders, including permitting and property acquisitions, as well as design and operational coordination with the cities of Tukwila and Renton, historical and cultural input from the Muckleshoot and Duwamish tribes, wildlife groups, adjoining property owners, King County pump station operators on the Black River, and the Union Pacific and BNSF railways. Interpretive signs along the trail share stories of native people and the importance and history of the land, forests and the Black River in sustaining them.


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