what we do

Roadway and Highway Design

Designing infrastructure to safely and efficiently move people and goods

Providing safe and efficient roads and highways is more challenging today due to limited funding and increasingly complex regulatory processes. Parametrix works with clients to develop solutions that are cost effective and minimize disruption to users and the environment. We incorporate LID, green streets, and complete streets principles to create appealing, safe, and sustainable transportation right-of-ways.

I-5 Mounts Road to Thorne Lane
I-5 Mounts Road to Thorne Lane Improvements;
Pierce County, WA
Client: WSDOT

To relieve chronic traffic congestion and improve mobility along I-5 near Joint Base Lewis-McChord (JBLM), WSDOT is rebuilding three interchanges and adding lanes to I-5. The overall program is eight miles in length and involves four separate projects. The program started in 2016 and work will continue through 2024. The new interchanges will incorporate roundabouts and provide grade separation from the rail line to improve traffic flow and reduce the potential for collisions. The program will also provide new and improved local connecting roadways and create a bicycle/pedestrian path in the corridor. Parametrix is serving as WSDOT’s General Engineering Consultant and has provided preliminary engineering, environmental documentation, final design, construction services, and surveying. Two of the four projects are being delivered through a design-build process.


  • US 12 and 21st Street Intersection

    US 12 and 21st Street Intersection

  • Mogollon Reconstruction | Parametrix

    NM 159 Drainage and Roadway Reconstruction

  • Idaho 16, US 20/26 | Parametrix

    Idaho 16, US 20/26 to Idaho 44

  • Pacific Avenue Improvements | Parametrix

    Pacific Avenue Improvements

  • Powell Butte Highway Roundabout | Parametrix

    Powell Butte Highway Roundabout

  • I-5 Mounts Road to Thorne Lane

    I-5 Mounts Road to Thorne Lane Improvements