This winter I have spent most of my time on a few southeast Idaho streams. Besides a few instances when there was a good midge hatch I have used nymphs and a few streamers.
I like to fish a lightly weighted rubber legs in tandem with a midge larva or other smaller nymph pattern under a strike indicator. On smaller creeks like Birch creek, I fish a parasol emerger with a trailing nymph and I seem to do pretty well. I have also trailed a nymph behind a larger dry fly but haven't been too successful during the winter.