I-90 Keechelus Dam to Stampede Pass Phase 2A

Hyak, Washington
Washington State Department of Transportation
Year Completed: 

Atkinson reconstructed a 2.5-mile portion of I-90 on Snoqualmie Pass. The project team widened the existing four-lane highway to six lanes and will construct an illuminated chain-up area on the westbound lanes.

The project scope also includes the construction of new bridges at Unnamed Creek, Price Creek, and Noble Creek, as well as a wildlife overcrossing at the Price Creek Rest Area vicinity. Each bridge is equipped with new culverts to carry stormwater. The team installed hydraulic connectivity zones at two locations, concrete barriers and guardrails, intelligent transportation systems, and a mitigation site at Price Creek.

The project extends from the east end of the I-90 Snowshed to the Keechelus Dam Phase 1C project, also being built by Atkinson under a separate contract. The ability to manage one comprehensive traffic control program for both projects provided Atkinson with a competitive advantage, and ultimately the contract award.