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Northgate Pedestrian and Bicycle Bridge
Northgate Pedestrian and Bicycle Bridge
Seattle, WA, United States
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Other Projects by LMN Architects
Northgate Pedestrian and Bicycle Bridge
Seattle, WA, United States
Long identified as a missing link in the transportation network of the rapidly developing Northgate neighborhood, the 2,060 foot long Northgate Pedestrian and Bicycle Bridge will be one of the longest pedestrian bridges in the country. The bridge will relink the western neighborhoods and North Seattle College to the future rail station, transit center, bicycle pathways, and commercial core of the area.
The bridge structure will be comprised of four major components. To the east, an approach ramp and a span over 1st Ave NE will connect the structure directly to the mezzanine ticketing level of the new light-rail station. To the west, two primary highway spans will connect to a curving approach ramp that meets grade on the campus of North Seattle College. Over its length, the structure will traverse a variety of urban, infrastructural, and ecological conditions.
The structural geometry of the primary spans is made possible by the development of custom cast steel connections, designed to facilitate in the fabrication and ongoing maintenance and inspection of the structure. The resulting form is a tubular structural network that will support the twenty-foot wide walking surface while simultaneously integrating guardrails, throw barriers, handrails, lighting, and drainage systems into a singular, iconic gesture. The structural form will also serve to frame distinctive views of the surrounding context on either side of the highway.
The project will not only reconnect the neighborhoods on either side of I-5, but will also augment the local ecological systems through an integrated landscape design. New and existing vegetated areas will accommodate an advanced stormwater management system featuring vernal ponds and swales on both sides. The project stands to substantially enhance the natural habitats of local wildlife as well as the growing pedestrian and bicycle infrastructure of Seattle.
The bridge structure will be comprised of four major components. To the east, an approach ramp and a span over 1st Ave NE will connect the structure directly to the mezzanine ticketing level of the new light-rail station. To the west, two primary highway spans will connect to a curving approach ramp that meets grade on the campus of North Seattle College. Over its length, the structure will traverse a variety of urban, infrastructural, and ecological conditions.
The structural geometry of the primary spans is made possible by the development of custom cast steel connections, designed to facilitate in the fabrication and ongoing maintenance and inspection of the structure. The resulting form is a tubular structural network that will support the twenty-foot wide walking surface while simultaneously integrating guardrails, throw barriers, handrails, lighting, and drainage systems into a singular, iconic gesture. The structural form will also serve to frame distinctive views of the surrounding context on either side of the highway.
The project will not only reconnect the neighborhoods on either side of I-5, but will also augment the local ecological systems through an integrated landscape design. New and existing vegetated areas will accommodate an advanced stormwater management system featuring vernal ponds and swales on both sides. The project stands to substantially enhance the natural habitats of local wildlife as well as the growing pedestrian and bicycle infrastructure of Seattle.
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