Abernethy Bridge, Road bridge in Oregon City, United States

Abernethy Bridge is a steel plate and box girder bridge carrying Interstate 205 over the Willamette River between Oregon City and West Linn. It has 15 spans and 60 girders over a total length of 2,727 feet, with a longest span of 430 feet flanked by two 300-foot spans. Its western approach sits on a bluff above the river while the eastern end lies in lowland just south of the Willamette-Clackamas confluence, so westbound traffic climbs the whole length of the bridge.

The bridge was constructed starting in 1968 after plans were approved in 1964 to handle growing traffic between the two communities. Its official opening in 1970 marked a major change in how the region connected.

The bridge carries the name of George Abernethy, an early governor of the territorial government in this region. His name remains visible in how locals refer to and identify this important transportation link.

The bridge is open year-round and provides direct access from both sides of the river. Visitors should expect considerable congestion during rush hours and weekends when traffic is heaviest.

On April 1, 1970, several West Linn citizens staged an unofficial "opening" of the unfinished bridge, jokingly dedicating it as the "West Linn Bridge". The city later added a depiction of the bridge to its seal.