- Such a bridge is rather narrow and short. (common interpretation: If it is longer, it needs to be narrow. If it is wider, it needs to be short.)
- Such a bridge is usually built for pedestrians only (footbridge), but it may also be used by cyclists, or animals, etc.
- Such a bridge can be made of various materials (wood, bamboo, stone, concrete…, or even metal like discarded railway tracks).
- Such a bridge has only one relevant structural element (e.g. one wooden plank, or a slab of concrete), or it consists of only a small number of main structural components (e.g. two parallel logs).
- The load-bearing structural element/s rest/s in position only by its/their own weight (e.g. on the banks of a stream). Further fixation, if existing, is secondary. Such bridges can usually be classified as simply supported single-span beam bridges.
- Constructed abutments at both ends of a bridge span often don't exist at all. If existing, they are not elaborately constructed, but only of simple design (rammed earth, in-situ rocks, parts of trees, rough concrete blocks, etc.).
- Additional elements like handrails may be present, and a bridge may feature e.g. smaller boards added on top, to provide a more even surface. But such characteristics are always secondary.
Small and simple bridges by material
Wood as material
Bamboo as material
Stone as material
Concrete as material
Metal as material
Unidentified, or combined material
bridge extended into a boardwalk, combined construction
multiple-span elements, might be called "too long"; besides: rather a boardwalk than a bridge (note the almost continous soil/vegetation contact)
decorative zig-zag bridge in a Japanese garden, multiple elements
looks like a bridge, but is rather a small dam with two culverts (note the pipes)