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  • Ridgeline Road Roundabout


Project Highlights:

  • Designed two roundabouts on arterial road for key intersections
  • One two-lane roundabout and one single-lane roundabout
  • Coordinated latecomer agreements and property owner cost sharing
Ridgeline Road Round Abouts
Ridgeline Road Round Abouts

Project Summary

Client: City of Kennewick
Location: Kennewick, WA
Services Provided:
  • Civil Engineering
  • Landscape Architecture
  • Land Surveying
The City of Kennewick envisions Ridgeline Road as a gateway into the City and the Southridge subarea. With this vision in mind, the City set out to design and construct an expansion of the road in the vicinity of its intersection with US 395.
MacKay Sposito was tasked with geomet­ric alternative development and final design for two roundabouts as­sociated with the project: one at Ridgeline Road and Plaza Way and the other at Ridgeline Road and Zintel Way. The roundabout at Ridgeline and Plaza is a two-lane spiral roundabout, while the Ridgeline and Zintel roundabout is a single-lane spiral configuration.
Our work included topographic and boundary surveys, right of way legal descriptions and exhibits, coordination of latecomer agreements and property owner cost sharing, civil design of the roundabouts, and landscape architec­ture.
The multi-lane roundabout at Ridgeline and Plaza is complete, while the roundabout at Ridgeline and Zintel is planned to be built when the adjacent land is developed.