A rusty pedestrian bridge spans a lazy-flowing river having two names in this winter scene in Tukwila, Washington (south of Seattle). This view looks west toward Interurban Avenue (site of the buildings in the background). At left is Fort Dent Park, site of the Starfire Sports Complex. The bridge is built from the type of steel that rusts to build a protective coating and forms a link in the Duwamish Trail, a river-oriented paved path for walkers, skaters, and bicyclists. The river is flowing toward the photographer's position on its way to Elliot Bay in Seattle.

The river's name is a bit odd. A Wikipedia article has the history behind this naming convention. As the river flows from the Cascade Mountains it is called the Green River. Where the former Black River (now Springbrook Creek) emptied into the Green (at left), the river becomes the Duwamish, in honor of the Duwamish Indians, who inhabited this area at the time that Europeans arrived. Thus the water going under the bridge is the Green River and the water flowing in the foreground is the Duwamish River. The location of the name change is not shown on any maps I've seen.

The bridge is at the center of this WikiMapia aerial view.