Previous Answer
Hint: This photo, taken in autumn 2022, shows one of the lowest (if not the lowest), in more ways than one, bridge on the connected navigable inland waterways network (unless, of course, you know differently), but which waterway does it cross? There are bonus points if you know both names for the bridge and the height of its headroom.
Thanks to Mike Daines for the photo.
Answer: The bridge crosses the Old River Nene, part of the Middle Level Navigations. The bridge is Exhibition Bridge, also known as Stoke’s Bridge. The officially declared headroom is just five foot, although this can vary with water levels. It is also a very low bridge in the sense that this part of the Old River Nene is the lowest level on the Middle Level Navigations and the bridge is about one metre below Sea Level. There is a useful map of bridges on the Middle Level Navigation and their headroom at the Middle Level Commissioners website. For bridge fans, there is a whole film about just this bridge on YouTube.
Correctly guessed (*with bonus points) by: Ian Cleathero*, John Foley and Rupert Smedley.