North Dakota, US
The Great Northern Railway Underpass at Stanley, North Dakota is a concrete deck girder bridge that was built in 1937. It is listed on the National Register of Historic Places. According to its nomination, the bridge "is a heavily-built single-span steel stringer design with a concrete substructure.
This design saw common use in the numerous structures built to carry North Dakota roadways under railroad lines, generally beginning in the 1930s."
Listen to the audio guide for Great Northern Railway Underpass Free on WIP — starts by itself when you arrive, even with the screen off