Just about all are fishable. South Fork drainage streams will open July 1st, but those draining really high country might not be the best choices. That also applies to streams draining the Teton Range. For sure the Portneuf River, Warm River, Blackfoot River (opens July 1st above the reservoir) and the Buffalo River will be in good shape. Sallys, PMDs and caddis patterns are good choices. So are attractor patterns. The same can be said for Robinson, Birch, Beaver, Sawmill and Medicine Lodge creeks and those going into the Salt River from Idaho ( Jackknife, Tincup, Stump, Crow). And these certainly will not have crowds like those seen on the more popular waters.