I'm a new member here so here goes. I did a 9 day trip in Jackson Hole and fished the Snake, Gros Vente, and some tributaries in Yellowstone. The Snake provided the most fun with some pretty spunky Cutthroats 10-15". The Gros Vente was very low and crystal clear with tough conditions. Yellowstone towards the Madison fished like the snake but mostly in the 12-14" range. Very beautiful cutts with a nice crimson/brown back and fine spots that put up a fight. A friend suggested it would be too hot in late August but it turned out to be in the 70s-80s mostly and some days fishable in shorts while others with breathable waders. I didn't get to fish for the big ones on the Flats but I was so preoccupied with the nice scenery around me. It wasn't about the destination or the numbers...
Racine