what we do


Designing connections that balance regional mobility and local access

From rural highway off-ramps to complex freeway interchanges, Parametrix helps agencies plan and design interchanges that safely and efficiently move traffic from one road to another. We help agencies with freeway and local operational analysis for highway and local corridors, and have provided analysis for numerous interchange justification reports (IJR), interchange modification reports (IMR) interchange access modifications, and corridor studies. Our staff have developed great working relationships with FHWA and state DOT staff and can guide you through the approval process.

I-84 Karcher to Franklin | Parametrix
I-84 Karcher Interchange 
Nampa, Idaho
Client: ITD and City of Nampa

ITD is reconstructing and widening I-84 between the Karcher/Midland and Franklin Boulevard interchanges, adding a third travel lane in each direction and auxiliary lanes between interchanges, and replacing the Northside Interchange. To accommodate the additional lanes, railroad structures and canal bridges will be replaced or widened. The interchange at Northside Boulevard is being replaced with a Single Point Urban Interchange (SPUI) designed to move a high volume of traffic within a small footprint, minimizing right-of-way purchases. Improvements are also being made at the Franklin Boulevard interchange including widening the eastbound off-ramp and modifying signals to allow two left-turn lanes on the westbound ramp. The improvements are being constructed in phases with completion scheduled in 2020.

Project Website:  https://itdprojects.org/projects/i-84-karcher-to-franklin/



  • SR 410/Traffic Avenue Interchange

    SR 410/Traffic Avenue Interchange

  • 116th Interchange at I-5

    I-5/116th Street NE Interchange

  • I-84 Karcher to Franklin | Parametrix

    I-84 Karcher to Franklin

  • I-5/Slater Road IJR | Parametrix

    I-5/Slater Road IJR

  • I-84 Meridian Road Interchange

    I-84 Meridian Road Interchange

  • West Olympia Access Study and IJR | Parametrix

    West Olympia Access Study and IJR