The Madison River has been fishing differently everyday. The flows at Varney are 2750 CFS with around 1 foot of clarity. The flows are probably going to increase over the next week with warming temperatures. Fish close to the banks with rubber legs and a small behead nymph below it. Also try streamers that are white and or yellow in color. The river above the west fork has 3 feet of clarity but that won't last long.
With the higher flows the fishing will become worse,
Flies
Rubber legs black- 4-10
Purple Pretty- 12-16
CDC Baby- 14
Purple Pheasant tail - 16
Sex Dungeon yellow - 4
Olive Sex Dungeon- -6-8
Anything Streamer that is White