NE 171st Street Urban Parkway Woodinville, Washington
An alternatives analysis process led to a selected concept for three roundabouts along the existing alignment of NE 171st Street in Woodinville, Washington. The design alleviates congestion created by zoning changes aimed at encouraging economic growth in the city’s downtown area. In leading the analysis, Otak also provided a variety of services including the full design and construction support that followed.
Converting an Arterial to Improve Capacity, Flooding, and Fish Passage
Zoning changes enacted within the downtown master planning area of Woodinville were expected to result in congested intersections at key entrances into the downtown core. Roundabouts at one existing intersection and plans for two others – at locations that would be constructed as the area became more densely developed – provided the basis for the identified best solution. The alignment for each intersecting roadway was determined while incorporating a roadway diet, from five lanes to two, between roundabouts to channelize the traffic safely and efficiently. These improvements came with several other benefits by substantially reducing paved areas, replacing two culverts to fish-passable standards, alleviating flooding, and adding stormwater quality improvements, and a multi-use trail.
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