While I have not fished the area before, for alpine lakes, I keep things fairly simple: olive or brown damsel fly nymphs (even after they have hatched they still work) usually in 10 or 12, elk hair caddis in 12 - 16, sparkle caddis emerger same sizes, and midge emerger patterns in 16-22 (mostly the smaller sizes). I have used buggers wth lots of success butI find the damsel nymph to be better producer. Most of the time I dont use nymphs but the following work fairly well: Prince nymphs, PT's, hare's ear nymphs, scuds amd midge patterns. Out of the previous, I pretty much just use midge patterns if I use any of them. Not in my fly box but effective flies would be a wullf, humpy, adams.
If the fish in a lake are small brook trout, then it usually doesnt matter what you use. They often over populate a lake and when they compete for food, anything that looks alive is fair game.
Hope this helps you out.
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Take care everyone and cya around. Mark
Take care and cya around,
Mark