Haengju Bridge, Road bridge in Gangseo District, South Korea

Haengju Bridge is a road bridge spanning over 2 kilometers across the Han River, connecting Gangseo-gu in Seoul with Deogyang-gu in Gyeonggi Province. The structure features multiple traffic lanes and dedicated pedestrian paths for daily movement.

The first Haengju Bridge opened on 22 July 1978 as part of National Route 39, linking the Gyeongin Expressway with Tongil-ro and cutting the route by 20 km. Its 10 m, two-lane width proved inadequate once Ilsan and Jungdong new towns grew. The replacement New Haengju Bridge, begun in October 1987, collapsed on 31 July 1992; rebuilt with cable stays instead of concrete stays, it opened on 19 May 1995. A third bridge, started in 1996, opened in December 2000, after which the 1978 bridge was closed.

The bridge takes its name from Haengju, the Goyang locality on the north bank, written in Hanja as 幸州大橋. The original 1978 crossing carried National Route 39 and linked the Gyeongin Expressway with Tongil-ro, cutting the trip between them to about 20 km and roughly an hour. The old span was later walled off with brick partitions and partly demolished in 2011.

The bridge connects major traffic routes, including access to the Incheon International Airport Expressway. Pedestrians can use dedicated paths, making crossing safe and accessible for everyone.

The 1992 collapse sent an 800-metre stretch of deck, piers and one of the two pylons down in a chain reaction; because workers had left the site an hour earlier, no one was hurt. The rebuild replaced the concrete stay cables with steel ones.