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I fish a fair share of limestone creeks. They can test your resolve. Be patient it takes time to crack the code. When the hatches are on your typical mayfly, caddis, stoneflies and midges will work. Sometimes they don’t. An observation I have witnessed and a great deal has been written about this behavior also. When the fish are not on the meal that is most abundant on the surface and the fish are thumbing their nose at emerges, but you observe them feeding. What I have seen is; on occasion the fish will dart in and out of the weed mats. What they are doing is; the fish will go into the weeds thrash around in that weed mat. The fish are dislodging scuds from the weeds, and then they will set in a feeding station downstream from the weed mat to feed on any scuds that drift down stream. So along with the flies that will be hatching at that particular time of the year, arm yourself with scuds 16-22. I like olive, tan and cream. Hope this helps. Good luck. Hope this helps. Good luck.