Yep...done plenty of fishing there in Sept.. I also like Slough creek but find it too crowded, another nice one is Soda Butte Creek, and my fave is the Lamar.....
In september bring lots of hopper flies in size 12...I always liked letort hoppers the best, but its a personal preference thing. I would also get a few Black Ants in about size 14...have seen them frequently do a flying migrate thing in Sept.
In all venues in that NE corner of the park be aware and be prepared for Griz.....
