Snake River
Flows from Jackson Lake Dam have been reduced to 2000 cfs over this past weekend.  The Snake is fishing very well and is getting better with each passing day.  Claassenia stoneflies are the primary fare on the water and they are literally everywhere.  However, we continue to see PMDs and caddis.  There are also a LOT of grasshoppers on the banks.  As an added bonus, there has been significant movement by Hecuba larva along the riverbed (a good sign for what will probably happen over the coming weeks).  The name of the game is foam on banks and structure and really just about everywhere.  However, we are starting to see more action on smaller mayfly and caddis imitations in riffles and on seams.  Activity is decent in the morning, but action is noticeably better in the afternoon and early evening.
If you are going subsurface, streamers are definitely producing in most types of holding water.  Going moderate in size will produce better than going big (at least in terms of number).  Floating and intermediate lines/tips are working best.  Mornings have not been the hot time for streamers but by late morning (10:30am and on) the actions starts and gets better through the afternoon.
Effective dry flies – Circus Peanuts (#8 to #12), Will’s Winged Chernobyl (#8 to #12), Snake River Water Walkers (#8 to #12), Melon Bellies (#8 to #10), Jimmy Zs (#10 to #14), Parachute Extended Body PMDs (#12 to #16), Parachute Hare Ear (#12 to #14), Comparaduns (#12 to #16), and X-Caddis (#12 to #16).
Effective streamers – Trevor’s Sculpins, Mini Loop Sculpin, Sculpzilla, J.J. Special, Beldar Buggers, Galloup’s, Boogieman, Arum’s Lil’ Kim, Chickletts, and Bellyache Minnows.
Effective nymphs – Copper Johns (#10 to #14) in red or olive, Booty’s Deep Stinker Nymph (#10 to #14), Lightening Bugs (#10 to #14), Psycho Princes (#12 to #14), and Halo Princes (#12 to #14).

South Fork
Flows from Palisades Reservoir have been reduced to approximately 10,200cfs. You still have to work for your fish but it is substantially easier now with the mutant stoneflies starting to emerge throughout the entire reach of the South Fork.  There are also good emergences of PMDs and caddis during certain parts of each day.  Attractors and stonefly imitations will produce in the morning but the real action starts after 11am.  Fish these patterns on banks and structure, but riffles and seams will also produce, and sometimes in even better.  Giving movement to them will get you into fish, especially in the early hours from morning until very early afternoon.  In the afternoon (but also early, early morning with caddis), PMD and caddis imitations are working in riffles.  Target active riffles and it will be possible to get into several eats, several hook up, and a satisfying amount of landed trout.
When going subsurface, trout are taking mayfly imitations primarily.  Target riffles, seams, and eddies.  PMD patterns are working best in late morning and will continue to produce through early evening.
Effective dry flies – Snake River Water Walkers (#8 to #12), Circus Peanuts (#8 to #12), J Slams (#8 to #10), Pheasant Tail Emergers (#16 to #18), Booty’s PMD Emerger (#14 to #16), Comparaduns (#12 to #18), Parachute Extended Body PMDs (#14 to #16), Sulfur Emergers (#14 to #18), Tent Wing Caddis (#12 to #16), and X-Caddis (#12 to #16).
Effective Nymphs – Lightening Bugs (#12 to #16), Rainbow Warriors (#12 to #16), Bruised Mays (#10 to #16), and Psycho Mays (#12 to #16).

Flat Creek
This is the time to be on Flat Creek.  Fishing is more technical now with the crowds that have hit it over the past two and half weeks but there is still active feeding and with concentration and perseverance, anglers can get into some very fun fishing.  Caddis and PMDs are the primary hatches.  There is also a fair amount of crane flies and grasshoppers about. 5X leader is still working well and there is not a big need to go with anything lighter.  We are getting into that time of year when the focus should be on the morning hours (from dawn until approximately 10am) and twilight (from approximately 6:30pm until dark).  This should most definitely become the case this week with the forecast calling for daytime temperatures to warm into the mid-70s and low-80s.
Effective dry flies – Parachute Extended Body PMDs (#16 to #18), Thorax PMDs (#16), Comparaduns (#14 to #18), Quigley Cripples (#14 to #18), Booty’s PMD Emerger (#14 to #16), Pheasant Tail Emergers (#16 to #18), X-Caddis (#14 to #16), Tilt-Wing Caddis (#14 to #18), U-Cons (#16 to #18) and Will’s Cranefly (#10).
Effective nymphs – LOF Pheasant Tails (#14 to #16), Bubbleback Pheasant Tails (#16 to #18), Lightening Bugs (#18), Prince Nymphs (#16 to #18), and Hares Ear Nymphs (#16 to #18).