For the past week or so, I've been hunting out, then diagramming all the possible bridges in my neighborhood that I've broadly defined as a man-made structure meant for people and cars to traverse a channel in the earth which can be occupied with water either regularly or occasionally. By this definition, the category includes road bridges, footbridges (either low or high water), and other structures that traverse a ditch where a drain pipe is covered by pavement or substrate put there on purpose to bridge the channel where the water runs through. (I drew the line at drain pipes emerging from sidewalks on one side as there is no body of water (however small) that is traversed by the sidewalk. Luckily, most of the bridges I crossed were the conventional kind and not the odd ducks like ditch crossings. If a footbridge is a feature of a road bridge, I count both as the same bridge, but if the footbridge and the road bridge cross the stream at different points, then I count them a...
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