The rivers in Colorado are rising and blowing out, and the upper SJ is no exception. Big stonefly nymphs and streamers will be your friend
Patterns/Bugs:
Pats Rubberlegs in 4-8.
Black Buggers 2-6.
Dont overthink it here this time of year.
The Juan is steady in the spring, and bugs are hatching. Fishing has been good with dries, nymphs, and streamers, depending on the time of day you get out.
Out at dawn? Fish a streamer.
Once the sun comes up, fish a nymph righ with a BWO nymph and midge pupa until fish start rising. Then throw a small drie if you so choose and have fun!
Patterns/Bugs:
Attractor nymphs: Bunny Leech Pine Squirrel Leech San Juan Worms, Egg patterns, and Annelids in 18-22, Blowtorch size 18-22 (if you can find em).
Midges 20-26: Black Flash Midge Pupa, Tavs Big Mac, Bling Midge, Grey and Olive Midge Pupa.
Midge Dries: Griffith Gnat 18-22, Bunny Midge 20-24.
BWO Nymphs: Foam Wing RS-2s 20-24, Killer May 20-24, Juans Sniper Baetis 22-24, Juans Jedi Master 22-24, All Flavors of WD-40s #20-24.
BWO Dries 20-24: Parachute Adams, CDC Comparadun, Vis A Dun, Baetis Parachute.