The flows on the San Miguel are rising and fishing may be tough with fast cold flows. Dropping a bigger nymph rig close to the banks/slower water may yield you a few fish.
Patterns/Bugs:
Nymphs: Prince nymphs 10-16, Runt Stone Golden 12-16, Pats Rubberlegs 8-12, 20 Incher 10-14, Flashback Pheasant Tail 14-20, Blowtorch Jig 14-16.
Eggs and San Juan Worms.