Hello,
We passed from Armenteira via Ruta da Pedra e da Auga two days ago. It was on the tail end of several days of rain and we didn't find it particularly challenging. The rocky trail was slick in some spot but passable. The roar of the water flow steps from the trail was magical to be honest.
Farther down the trail after the descent (approaching Ponte Arnelas) there was an area of flooded riverbank. The water depth is deceptive - we flooded our shoes in calf deep water. Other than that one spot, it was a great trek. There may be a way to get around it - we stubbornly just pushed through rather than retreat and go around. Result was wet feet and the first blister of our camino!