South Fork of Snake River- September 18, 2019
September 18th, 2019
Irwin Guage: 4910cfs
Lorenzo Guage: 2660 cfs
Dries: Big foam, mahoganies, blue winged olives
Nymphs: Mayfly and midge tungsten bead heads, pats rubber legs
Streamers: Olive, black, white, yellow, gold flashy
Fall has arrived here in the Tetons.
The tops of the highest peaks received their first dusting of snow for the season. Friday looks rainy with a high of 55, so pack your waders if your fishing tomorrow! Saturday looks like perfect fishing weather with a 50% chance of rain and a high of 59, the sun might even make an appearance. Sunday through Wednesday of next week looks like mostly sunny with temperatures reaching back up to the high 60s.
The South Fork was flowing around 9500 cfs from early August until September 8th. Since the 8th the South Fork has gradually been reduced to around 5000 cfs. This has opened the door to fun, new fishing spots. Banks that were previously too fast to fish at the mid summer flows have slowed down and we are catching fish from places we wouldn’t dare throw a fly at 9500 cfs. The newly exposed riffles and gravel drop-offs have been producing lots of nice fish. Even some of the cliff walls that were typically too fast have been holding fish in the canyon.
The change from summer to fall has brought with it a change in bug activity. The hopper and mutant stonefly activity has slowed down but reports from our guides continue to bring good news of nice fishing eating large foam attractors on the surface. The cloudy, rainy days have sparked the hatch of blue winged olives and mahoganies. When the mixed weather days cause the blue winged olives to hatch it appears as if every fish in the river is eating at once. The hatch is strongest when the clouds are thick and there is a little bit of rain. On the cloudy days it is also fun to throw a streamer and watch the fish chase and smash that thing.