Re: Madison River this September...
I just returned from vacation to Yellowstone on Saturday. The Madison outside of the park is fishing very good on hoppers and para ant patterns.
The wind in the Madison river valley and also in the Lamar river valley is very,very strong and I definitely recommend a fast 5 or 6wt rod. You can rent an outfit in West Yellowstone flyshops but what better excuse to get a new rod at LRO to add to your arsenal! Good luck!