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I-90/SR 18 to Deep Creek Interchange Improvements and Widening 

Snoqualmie, Washington State 

The scope of work for the Interstate-90 (I-90) / State Road-18 (SR-18) to Deep Creek Interchange Improvements and Widening project includes:
  •  Design and construction of a four-lane diverging diamond interchange
  •  Widening of SR-18 to four lanes from the interchange to Deep Creek
  •  Design and construction of a four-lane bridge over Deep Creek and a two-lane bridge over Raging River


Washington State Department of Transportation (WSDOT) 

US$126 million


The diverging diamond interchange will improve the flow of traffic by reducing the number of traffic signals and offering more free turns for drivers entering and exiting the interstate. Growth in Snoqualmie Valley has resulted in the current I-90/SR 18 interchange being one of the busiest in Washington State.

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