It’s time to start planning ahead for trips over Interstate 90. A number of road improvement projects will cause delays for drivers this spring and summer as the Washington State Department of Transportation (WSDOT) improves sections of roadway from the summit of Snoqualmie Pass to Vantage at the Columbia River.

WSDOT and contractor crews will start work in the next several weeks on a number of projects that will add lanes, build and paint bridges, repair cracked sections of pavement, install fencing and plant vegetation for roadside restoration.

Several locations east of Snoqualmie Pass will have single-lane closures and rolling slowdowns, which will add to travel time.

“It’s going to be another busy summer of construction on I-90,” said Don Whitehouse, WSDOT regional administrator. “Drivers will need to add extra time to their east-west trips..”

Crews will resume work on a $551 million project that builds a wider, safer and more reliable stretch of I-90 from Hyak to Keechelus Dam.

In June, crews on this five-mile-long project will resume blasting along the rock slopes east of Snoqualmie Pass. Drivers need to plan for hour-long closures, Mondays through Thursdays, starting an hour before sunset.

Also in June, crews will be repaving deteriorating concrete near Easton from mileposts 67 to 70 and near Cle Elum from mileposts 84 to 87, and break ground on the next two miles of the I-90 Snoqualmie Pass East project by building new lanes, bridges and the first wildlife overcrossing in the I-90 corridor.

Drivers can find information on multiple websites, including the What’s Happening on I-90, Snoqualmie Mountain Pass and Traffic Alerts pages. Drivers can also follow the action on Twitter @snoqualmiepass and @wsdot_east, or sign up for email updates.