Project overview
Phase 4 is part of a 15-mile corridor improvement project to increase safety and reliability and reduce congestion along I-90 from Hyak to the Easton vicinity.
What to expect
Construction for this project phase has not started and drivers should not expect to see travel delays.
Phases 3 and 4 of the I-90 Snoqualmie Pass East project widens I-90 from four to six lanes, stabilizes rock slopes, builds bridges, adds truck-climbing lanes, straightens curves and connects wildlife habitats.
WSDOT will continue to increase capacity and improve safety by adding a new lane in each direction, replacing concrete pavement, stabilizing rock slopes, building wildlife crossings, straightening the roadway and adding new chain-up areas.
Safety
WSDOT will improve the driving surface on I-90 by replacing the concrete pavement, straightening the roadway and adding truck climbing lanes.
Congestion Relief
By adding one lane in each direction, WSDOT will increase capacity by 50 percent in each direction to accommodate projected traffic volumes for the next 20 years.
Environmental
WSDOT will minimize impacts to the environment and improve movement of wildlife.