September and October are two of my favorite times to fish the wondrous water of Yellowstone National Park and I always have the same problem on day-off from guiding anglers. Where should I fish today? Should I travel to the Lewis River, is it too early for the big brown in the Lewis Channel, are the large brown beginning to run in the Lower Gardner, do I run down and fish the Madison for the brown trout moving up out of Hebgan Lakes or do travel to the Firehole to fish the Black Caddis and Baetis Hatch? As you can see it can be a tough decision however as much as I love to chase the big trout I also love to dry fly fish and as the days grow cooler I know the summer is ending along with the major hatches.