OK, I guess they just built more bridges in this exact same style, but you made me check street view.
Some older canals have a walkway beside them for horses to pull the barges. I wonder if that is a horse path?
I know it's hard to tell from the photo, but it's way too narrow for that. It is a part of a bike path now, and there's actually a sign on both sides of the underpass instructing cyclists to dismount because there's barely enough space for two bicycles going opposite directions to pass. So I doubt it was ever meant for anything other than pedestrians.
