Three Creek Lake is still seeing excellent afternoon Callibaetis hatches. The fish are responding to them very nicely too. 
Some black caddis later into the evening and some midges. Fish a X Caddis, Red Century Drive Midge and Griffiths Gnat and check out our Hi Viz Griffiths Gnats because it is a midge your old eyes can actually see!
I’d also try Balanced Leeches, Damsel Nymphs (add a Hot Head Bead both Fl. Orange and Chartreuse versions to the box), Sheep Creek Special, Chironomids and Water Boatman.