A hundred years ago this month, the February 1925 issue of Science and Invention gave these self-explanatory plans for constructing an emergency foot bridge. It had the advantage of being able to use it as you constructed it, since you pushed each new section into place.

Each support was a pair of jumping poles. You would form them into an “X” shape, and then push them out ahead. Perhaps some student will be inspired to turn this into a science fair project. Or perhaps a scout looking for a good pioneering project might be inspired. (If the water below is deeper than ankle-deep, then the current Guide to Safe Scouting calls for participants to wear a life jacket.)

Some links on this site are affiliate links, meaning that this site earns a small commission if you make a purchase after using the link.