Argonne/I-90 Bridge Project

Challenge 

The existing two-lane Argonne Road Bridge over Interstate 90 (I-90) is the critical bottleneck moving through Spokane Valley and eastern Spokane County. The bridge is old, undersized, weight-restricted, has insufficient clearance over I-90 and has no pedestrian or bicycle facilities.

Goal

In 2022, Spokane Regional Transportation Council (SRTC) awarded $1.2 million to begin project design. The City requires an additional $3 million to complete design. The City initiated its preliminary design efforts in fall 2023.

Project Context

The Argonne Road Bridge over Interstate 90 is a principal arterial and designated T-1 freight corridor experiencing over 10 million gross tons annually, Washington State Department of Transportation’s (WSDOT) highest rating. The project will reconstruct the existing bridge and add a third lane to improve safety and traffic flow. A new shared-use path will add pedestrian and bicycle facilities to improve safe mobility for all users. This project was identified in the 2015 University Road Overpass Study.

Partners

By 2028, Spokane Transit Authority (STA), the region’s transit provider, will construct its I-90 regional Park and Ride Facility along the southern limits of the interchange. 

This transit project is fully funded by WSDOT and STA. Together, the City, STA and WSDOT will be responsible for collaborating to deliver these companion projects.

Estimated Cost (By Phase)