Wilsonville railroad bridge, Railway bridge in Wilsonville, Oregon, United States.

The Wilsonville railroad bridge is a 1,220-foot (370 m) steel truss bridge over the Willamette River, carrying a single track for the Portland and Western Railroad. Its superstructure is made of weathering steel, which oxidizes to a protective rust layer and needs no painting. The bridge rests on four concrete piers in the river, three on land, and two abutments, with two 250-foot (76 m) thru trusses and six 120-foot (37 m) deck girder approach spans.

This bridge was constructed in 1975 to replace an earlier 1907 rail bridge that had wooden sections and suffered structural damage over time. The replacement reflected advances in engineering and riverine design.

The bridge carries freight for the Portland and Western Railroad, which leased the line in 1995 and bought the tracks in 1997. Burlington Northern donated the land and bridges under the tracks to the state in 1998. The crossing stands at river mile 38.8, upstream from the old Boones Ferry landings.

The bridge is best viewed from nearby roads or riverside paths where visitors can see the full steel structure clearly. The strongest viewing angle is from the riverbank, where the truss framework is most visible.

The 1975 bridge uses two steel through-trusses, each 250 feet long, with the structure above the tracks rather than below. This let the deck sit lower than the 1907 girder bridge, which stood 120 feet tall. The black appearance comes from weathering steel that oxidizes into a protective layer, so the bridge never needs painting.