Winter fly fishing tends to keep it simple. I like to fish heavy sculpins in what I (and many others) call Winter Water, fishing slowly with only an occasional twitch into 2 or 3' deep slowly moving runs, bright bright worms and small nymphs in fished surprisingly shallow water. And, when conditions allow, dry fly fishing with midges into pods of dimpling fish. Midges are the only hatch. But it lasts all winter long.
As long as it's above freezing the fishing is straightforward. If your guides are filling up with ice it works best if you keep an even distance and false cast the whole thing, pulling line through the guides only when you catch a fish. Sometimes you have to set the hook and then walk backwards to land a fish.
The midge fishing can be surprisingly good, everywhere from tail waters to spring creeks and even on the bigger rivers. The hardest part is getting out there. And getting started. Once you spot those dimpling fish the rest takes care of itself.
I don't have a good adult midge photo. What appears below is still better than nothing. Midges have surprisingly widely spaced legs. They sit low and flat to the water with folded downwings, somewhat like a miniature Caddis fly.
The traditional Griffith's Gnat doesn't look much like a midge. The Griffith's Gnat is sometimes referred to as an imitation of a cluster of midges, rather than an imitation of an individual.
Midges are small. Attempting any dry fly midge imitation involving a wound hackle--including the Griffith's Gnat--is tricky. Right Hackles are easier.
Right Midge
#22 DaiRike 125
Mallard Flank
Dark Gray Zelon
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