 The grade carved by the creek is the least steep route from the Spokane River valley onto the Columbia Plateau, and is conveniently located just west of the city center.Interstate 90 is the city's official division between the West Hills and Grandview/Thorpe neighborhood, though the unofficial Sunset Hill neighborhood straddles that division.An arterial runs along what was once a major Native American thoroughfare in the northwestern part of the city, along the edge of the Spokane River Gorge.