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  • Hildebrand Roundabout


Project Highlights:

  • New roundabout design
  • Challenging design due to steep cross-slope
  • Intersection of Hildebrand and US-395 also redesigned
  • WSDOT intersection approval received

Project Summary

Client: City of Kennewick
Location: Kennewick, WA
Services Provided:
  • Civil Engineering
  • Land Surveying
The roundabout on Hildebrand Boulevard in Kennewick, WA provides a gateway to significant new commercial and light industrial development on the east side of US-395. The roundabout also helps control traffic speeds and provides a transition into the Canyon Lakes planned community, a high-end master planned golf course community in South Kennewick.
MacKay Sposito was hired to design the roundabout and a portion of Hildebrand Boulevard. The project was challenging because the roundabout had to be fitted in an area of steep cross-slopes. MacKay Sposito performed detailed grading analysis and prepared 3-dimensional grading models of the roundabout to refine the design. The resulting roundabout has smooth grade transitions and is safe and drivable in all-weather conditions.
In addition, the project included a redesign of the intersection at Hildebrand Boulevard and US-395. The intersection redesign required additional travel lanes and right turn pockets as well as development and permitting of a Washington Department of Transportation intersection plan. MacKay Sposito also coordinated efforts with a traffic engineer to prepare a new signalization plan for the Hildebrand and US- 395 intersection.