Crews pour concrete as part of work of a new retaining wall along the east side of northbound I-405, near Coal Creek Parkway. The wall will support the hillside so a new northbound lane can be added to the east of existing lanes.A backhoe removes dirt in preparation for building a new lane on the on-ramp from 112th Ave SE to northbound I-405Crews drive steel piles in the ground to begin widening the bridge next to the highway on the east side of I-405 at Coal Creek Parkway.A truck pumps concrete for a new shaft to support the new southbound bridge over I-90.A welder repairs an auger used to drill shafts for the new bridge over I-90.A welder works on the metal cage for one of the piers that will support the new bridge over I-90.