阿賀野川橋梁, Railway bridge in Niigata and Agano, Japan.

The Agano River Bridge is a 1,229 m railway bridge on the JR East Uetsu Main Line between Shin'etsu and Kyōgase stations, spanning the Agano River between Niigata City's Akiha ward and Agano. Its current form combines one Warren truss, three Schwedler trusses and 65 deck plate girders.

Completed in 1912 for the Shinetsu Line between Niitsu and Shibata, the 1,229 m bridge was then Japan's longest railway bridge. On 29 August 1961 a down train collided with a trailer at a level crossing and hit the bridge; one of four Schwedler trusses collapsed, killing two locomotive crew. The line reopened on 19 September 1961, and the span was fully restored on 16 September 1962 with a new Warren truss.

The bridge forms a key connection for the JR East Uetsu Main Line, linking communities on both sides of the Agano River. For local residents, it is an everyday transport link that helps shape daily routines and regional interaction.

The bridge is best experienced by traveling on the train that crosses it, offering views during the journey. From the riverbanks and surrounding areas, visitors can observe the structure from different vantage points.

The bridge is a patchwork of different construction periods, as it was rebuilt after 1961 using components salvaged from other bridges. This makes it an unusual example of how Japanese engineers solved reconstruction challenges by repurposing available materials.