Ridgefield National Wildlife Refuge, Pedestrian Bridge

Ridgefield, WA

U.S. Fish and Wildlife Service


Miller | Hull Partnership

Services/Project Type
Structural Engineering
Civil Engineering
Stormwater Management
Boundary Surveys
Topographic Surveys
Planning & Permitting
Roadway Design
Surface Water Management

KPFF provided structural engineering, civil engineering and surveying services for this new pedestrian bridge in the Ridgefield National Wildlife Refuge. The structure provides ADA-compliant access over three active BNSF tracks and serves as the primary connection between the Refuge's parking areas and the rest of the preserve. The 615-foot-long, 6-span steel girder bridge clear spans 160 feet over the tracks, and 1,800 feet of pathway connect with the 5,000 acre wildlife refuge.  

The slender ribbon like steel plate girder structure gracefully arcs over the railroad tracks and provides all required railway clearances while maintaining an ADA compliant profile for its users. The structure sweeps over ninety degrees, affording visitors with an exquisite panoramic view of the Refuge. In addition to the curving superstructure, aesthetically-inspired designs included architectural protective screening over BNSF, delicate substructure elements at interior bridge supports, and low-impact stormwater management. Flexible steel wire mesh screening was detailed to "fan open" in three dimensions along either side of the bridge pathway creating a dramatic gateway to the Refuge as visitors emerge over the crest of the bridge. The alignment and pathway design were carefully selected to avoid impacts to wetlands, archeological artifacts, and other cultural resources.


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