I-84 Meridian Road Interchange

The I-84 Meridian Road Interchange project replaced an existing diamond interchange with a new Single-Point Urban Interchange (SPUI) and reconstructed over 4 miles of interstate to provide additional capacity, improve safety, and extend the design life of I-84. Considered the gateway to the City of Meridian, the interchange is currently the second busiest in the State of Idaho. Originally constructed in 1965, the interchange was designed to handle 11,000 vehicles per day.

The new interchange is designed to handle 284,000 vehicles per day. The new two-span SPUI is wide enough to allow widening of the interstate to 4 lanes in each direction. Meridian Road now has 3 lanes in each direction with dual left turn lanes and sidewalks and bike lanes. Parametrix was the prime consultant for the design of this interchange, completing design and PS&E in just 10 months. Work was coordinated closely with an in-house Idaho Transportation Department design team designing improvements to I-84, and we combined both projects into one bid package.


Idaho Transportation Department

Meridian, ID


Engineering Excellence Award, ACEC Idaho

Project of the Year over $10M, ASCE Region 8

Project of the Year over $10M, ASCE Southern Idaho Section

3rd Place – Transportation, Idaho Business Review

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