Riffle fishing on the South Fork is about as good as it gets, especially on the upper river. The flow out of Palisades Dam has been a bit over 13000 cfs with water temperatures in the high 50s in deg. F. for weeks. This is the kind of stability that results in consistent insect activity needed for great fishing. Pink alberts and the remaining PMDs are the reasons. Begin in the AM with nymphs, switch to your favorite emerger pattern as the day advances and you see increased rises. Some folks prefer to stick with their favorite emerger pattern, but others later on switch to a dun pattern for the surface. Fishing the banks is also a good strategy. Hoppers are out and sure to increase, so your favorite pattern should be in that fly box.