I figure if I can hop over it most places its a small creek. Otherwise, its a big creek, or a stream, etc. I've caught trout, no kidding, in a creek that was only a yard wide at the widest, and the trout were in a trough roughly a foot wide and a foot deep, the top of which was mostly hidden by grass. It meandered through a meadow, widened to about a yard wide and an inch deep as it passed through a campground and then dumped into a stream. People around the campground regularly stepped over it on their ways to and fro.

Cheers