Personally, I'm finding the same thing on the upper Rogue.
'Classic holding' water from past years has shown me very in the way of results. Places I'd rarily fish are producing the most hook ups. It appears that a few squirts of high water last, and this, winter really changed severl major lies.
In one major case it looks like all the gravel that the fish would hold in has been swept clean right down to bed rock. To make things even more interesting (lower Modoc Ponds bar) has had a major tree dump into the river. That will screw up casting/fly swing .... sigh.