I was up there last year (NOV 3-6). It was great fishing. The flows were low it was easy to spot fish. Went 6 (landed) out of 12 (hooked). Not sure if that is good. The temps were mild. I was even fishing in a T-shirt midday on a few outings and could smoke cigars well into the evening without even the slightest chill. The weather did not feel like November.
I'm sure March will be ice-cold and the flows will be up. Basically the opposite of the fishing experience in Nov. I will bring all of my heavy duty fly rods, big bobbers, heavy tippet, and good cold weather gear to accommodate these new conditions.