Cooler and longer nights, lower flows out of Island Park Dam, and less daylight are making for changes. Streamer and two-fly nymph rigs fishing is picking up in Box Canyon. Mahogany Duns and BWOs are showing on the river below as tricos and callibaetis decrease. Terrestrial patterns still work, but their days are coming to an end as we cool of further. So make some changes in your fly box!