SR 410/Traffic Avenue Interchange

The SR 410/Traffic Avenue Interchange is significant to the growing South Sound region; it is a freight route, provides access to a regional commuter rail station, access to the free for emergency services, and acts as the entrance to downtown Sumner. The existing overpass allowed only a single-lane in each direction and was a major bottleneck for traffic.

The existing two-lane structure was upgraded to accommodate south-bound traffic and a new, adjacent structure provides two lanes for northbound traffic and a new, wide non-motorized pathway for pedestrians and bicyclists. The parallel structure is a 134-foot single span providing additional clearance for a future lane addition on the SR 410 mainline. Intersections at either end of the interchange where traffic merges with SR 410 were reconstructed, left-turn lanes were lengthened, and new traffic signals installed to control traffic flow and reduce blockages. Parametrix led the design efforts for the interchange improvements.


City of Sumner

Sumner, Washington


Gold Award – Social, Economic, and Sustainable Design, ACEC Washington

Scroll to Top