Hi, Bruce.
Don't have much opportunity around here in north central Texas to fish for smallmouths, but for largemouths, bream, and crappie I have never used a more effective fly. I'm sure smallmouths will eat it up, too. I have had better luck tying them with the whole feather used as the wing instead of the bunched fiber wing and putting on a bead head improves it many times, as well. I have no doubt that they will work on trout in streams.

Joe