Type: Arch bridge
Image: the helical DNA shape
Location: Seattle, Washington, US
Length: 420 feet
Material: PTFE
Designer: Johnson Architecture and Planning, KPFF Consulting Engineers
Reference: http://www.birdair.com/projectGallery/amgen_helix_pedestrian_bridge.aspx, http://www.flickr.com/photos/ravenda/2734943054/
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