There was a bear incident in Island Park recently, so it seems appropriate to mention not only bear spray but making noise to warn any bear that you are on the area and gives them a chance to get out of your way. It seems a lot less stressful if you let “brother (or sister) bruin” know you are in the area and it is time to leave, than is having to use that bear spray. Look at our current Yellowstone Park fishing report for some ideas on the subject of making noise to warn bears of your presence.
Flow out of Island Park Dam is considerably less than normal, so getting around to pitch those two nymph rigs or streamers in the evening is easier. Terrestrial patterns are the day time “name of the game” in the river below. Some tricos can make early AM fishing interesting. Are you more interested in fishing the lower river? The Warm River to Ashton part is the place to try. Terrestrial patterns (ant trailing a hopper) work well, and caddis and streamers in the evening will bring action. A good cold snap will improve action on the river below Ashton dam.