Fished the upper part from 6pm to 8pm. Saw a rise every 10 seconds. hooked into 8 fish but only landed 6. All caught on a #16 light cahill but a size #14 would probably work better based on the mayflys I was seeing. Fish ranged from 6-10 inches except one that had to be in the upper teens but broke off unfortunately. I've never had a fish that big on the fly. I'm switching from 5x to 4x tippet now. Hopefully i'll get him next time.