Is it reasonable for a river to be shallow enough to ford in one location, while nearby (say within 5 miles or less), be at least 12 feet (3.6m) deep? The same river can have shallow sections and deeper sections, right?
The reason I need it to be that deep is because, in the fantasy novel I'm working on, there is a scene where a character jumps in from a partially collapsed bridge. Because the bridge is collapsed, the nearby town can only be reached via the ford.
If it matters, this is in hilly territory, i.e. the foothills of a mountain range.