Yellowstone River (10,200 CFS at Corwin Springs)
Well, the Yellowstone River is fishing- and fishing well. Salmonflies are above Emigrant, and the fish are kind of eating them. Nymphing has been quite good, and the streamer game should get better each day for a while. Stonefly nymphs, sculpins, and other streamers have been working. Try trailing a sally nymph mid-day, and caddis droppers in the afternoon
Madison River (1,590 CFS near Cameron, 1,930 below Ennis Dam)
The Upper Madison is fishing quite well right now. The big bugs are near the top of the river, and so are the boats. The bite has been good some days, and great the others. Below Bear Trap, the water is warming but still fishing well. Go early, and stay in front of the tube crowd. They are still eating crayfish, sally nymphs, and PMD droppers.
Gallatin River (2,050 CFS at Gateway)
The Gallatin is fishing quite well. Salmonflies in the canyon, and the fish are looking for them. The dry fly bite has been quite good throughout the day. Try trailing a caddis dry or a Little Yellow Sally off the salmonfly.
Jefferson River (2,800 CFS at Twin Bridges)
The Jeff has been fantastic as of late. The river has come down quite a bit over the last few days, thanks in part to the irrigation pumps running throughout the system. But the fish have been on the bite. We had an incredible day on the Jeff today.
Missouri River (6,810 CFS below Holter Dam)
PMD's. That should cover it.