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I-90 - Spokane to Idaho St Line



WSDOT is in the process of designing a revised Barker Road Interchange and in the preliminary stages of developing concepts for the Harvard Road/Liberty Lake Interchange.

Why is WSDOT pursuing improvements on I-90?
I-90 is a major commute and travel route for eastern Spokane County and North Idaho with traffic volumes exceeding 100,000 vehicles per day. I-90 is a Strategic Freight Corridor because of the international and domestic interstate and intrastate trade that it carries. The freight that is hauled within this corridor has a substantial market value and includes: grain products, household goods, retail merchandise, metal products, groceries, mail, and lumber.  

WSDOT has completed widening of I-90 from Sprague Avenue to Sullivan Road.

Preliminary design work from Barker Road to the Idaho State Line is underway.  Additional funding, which has not yet been allocated, will be needed in order construct future segments.

The End Result
More efficient operation of I-90 operations. 

Project Benefits
The project will improve traffic flow and reduce congestion.

What is the project timeline?
Fall 1989, the "I-90/Four Lakes to Idaho State Line" Environmental Impact Statement was completed.  This project is included within the limits of that study.

The Sprague Avenue to Argonne Road construction project on I-90 was complete late Fall 2001.

• Widening from Argonne Road to Sullivan Road began in 2003 and was completed in 2005. 

Widening from Sullivan Road to Barker Road began was completed in 2013.

 Analysis for the Barker to Harvard Road and Harvard Road to the Idaho State Line sections is underway.   

Financial Information

This project is funded from the following sources:

  • Federal Funds - $10.5 million
  • Total funding Available From All Sources - $10.5 million
  • Unfunded Amount Remaining - $210 million


How can I get more information?
Project Engineer 
Larry Larson
WSDOT Project Office
2714 N. Mayfair
Spokane, WA 99207
Phone: (509) 324-6000

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