Three Creek Lake has been more hit and miss than we normally see it this time of year, but there have been absolute moments of glory and it remains a top priority for us for all of July! Balanced Leeches, Red Jigged PT Nymphs and Callibaetis hatches are the dominating 3. Beetles, Ants and #16 Black X Caddis are your next 3, and should be more important this week with the hotter days and evenings coming. I think one of the reasons for the slow evening bite has been strong winds. It has been windy up there and it’s throwing off that evening hatch and bite we love. 
Oh yeah, the mosquitos are still bad when it is calm, so make sure you have the bug spray. Bi Mart and Ace sell it in Sisters.