Three Creek Lake is for the most part okay. It is no longer summer at 6500 feet and the hatches of everything have slowed way down. Leeches and Scuds, Blobs, Boatman and Damsel Nymphs are patterns we think to go to in Fall. I would add Callibaetis nymphs and Ants. 
My friend Phil came to the shop late this afternoon on his way up there and I suggested the RP Ant for him. I texted him a moment ago and asked how it was and he got one on the 3rd cast with the RP. Cool. I’d fish 10 am to 4 PM for the best bite of the day. Let it warm up a little and get the fish moving.