Not telling anyone's secrets
We have a couple of anonymous “advisors”. These are people who fish “jez ‘bout every day”. No one wants to give up their favorite fishin’ hole, but that said, this is a contiguous river system (the South Platte in South Park) and so if you have one species of aquatic insect undergoing a specific behavior (agitated pupa scurrying about with enlarged wing sacks trying to decide if they want to stay or if they want to go) – the resultant fishing experience is probably uniform whether you are upstream of Spinney or downstream of Lake George.
So, yesterday one of our advisors had the second best fishing day of his life in this area and “we ain’t sayin’ where” exactly cuz he would stop talking to us, but I can say it’s within our South Platte River system in the vicinity of Lake George. That information is probably a universal element to take with you anywhere in the river system below Tomahawk and above the confluence with the Tarryall.
Here is what he used and what I can direct you to try:
He used a #20 brassie that he modified to have a little white “stick-out” of floss behind the bead head. Literally, he tied and snipped a piece of floss behind the bead and in front of the thorax (usually peacock herl). This is a bit like combining a WD40 with a brassie. This modified brassie is what the trout were taking. He had this fly trailing a copper john and he used a very light split shot. The result was a fish on every cast. EVERY CAST.
There ya go.