Reports from my guides the last 3 days, and also from friends Garrett and Gabe today have been S-L-O-W coming from Three Creeks Lake the last several days. If you get there early as the sun is coming up, or go up at dinner and fish to dark it will be better. 
Mornings seem to be leaning to Callibaetis spinners more than anything, but emergers & duns enter the mix about 7 or 8 am then peter out quickly. 
Keep an eye on bigger callibaetis hatches after 4. No guarantee, but likely. 
Red Hippie Stomper, Ants, Beetles, Red Chubby are good attractors or “non-aquatic hatch” flies to use. Fish can, and do come out of nowhere for flies like this. 
On our guide trips we did have several good take downs on Balanced Leeches the last 2 days. That is telling me the fish are deeper at certain times of the day. 
At dusk the Black Caddis Hatch is a staple in June, July and early August and we just restocked the #16 Black X Caddis for this exact reason. 

A little philosophical reasoning- Just because “it” was slow the last few days doesn’t mean tomorrow or next Wednesday will be slow too. 
We can’t know. 
I report and write about trends and want you to have the knowledge to make good choices and have the best time possible. 
I love the unknowns, and it was cool to sit on the porch this afternoon with Garrett Lesko and Gabe and we all agreed that if it was always easy, then what the hell kind of game it would be and how boring it would become if tough days, or bewildering days didn’t hit us from time to time. 
Keep it interesting Fish Gods, and give us some gifts when you feel it is right.