Three Creeks Lake is still fishing well. Especially in the evening, but later afternoon usually will see a good callibaetis hatch. In the evening Callibaetis and Black Caddis are the best, but could be a good enough midge hatch to get the fish up.
During the day, Chironomids and leeches, especially under an indicator are your best bets.
Never forget your ants and beetles on a mountain lake.