On my recent Cwm llafar Horseshoe walk, you just had to go for it, wade chest deep in very fast flowing water.
A few years back, when attempting the Cwm Caseg to Carnedd llewellyn route, i knew there was a walk of over two miles, to find a suitable ford to cross the Caseg river.
There are just some situations, where finding a suitable crossing point of a river, or stream in heavy spate, is impossible.
Wet feet are inevitable, you just have to wade through the water, as sometimes there are no alternative routes.