The immense journey of Interstate 90, from Seattle to Boston, includes only a small part of Idaho as it crosses the narrow part of the state in the Panhandle of Northern Region. Crossing from Spokane at Post Falls, the freeway intersects Idaho's main north-south route, Highway 95, at Coeur d'Alene, and proceeds east through Kellogg and Wallace before crossing into Montana at the summit of Lookout Pass.
