South Fork & Henry's Fork Fishing Reports

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Fishing Reports

Jimmy's All Seasons Angler / Fishing Reports (Page 10)

South Fork, October 3rd, 2020

Even through flows are where they should be ( 5980 cfs at Irwin, 6590 cfs at Heise, 3100 cfs at Lorenzo), action has slowed a bit, especially around riffles, during these bright, clear days.  We need some stormy (with rain) weather to help increase fish activity.  Regardless, as we move through October, streamer fishing will pick up as brown trout migrate to spawning areas.


Small Streams, October 3rd, 2020

Blackfoot R. 1 (2)

We are yet to have a killing frost, so grasshoppers are abundant in the valley. The lower Teton River offers good hopper fishing as well as active BWO and caddis. Hoppers also remain in higher elevation meadows on the Teton and Blackfoot Rivers, and will be present until a killing frost wipes them out.  Warm River, just below its spring, is not visited much this time of year, so offers solitude as well as AM tricos, BWO and caddis activity with a few hoppers and other terrestrial insects thrown in for resident brook, brown and rainbow trout.


Still Waters, October 3rd, 2020


horseshoe (2)

Daniels Reservoir, even though water is low, remains a good bet for fishing. Slowly retrieved leech  and streamer patterns on an intermediate line work well but, but midge patterns under an indicator seem best.  Fishing on Springfield Reservoir is picking up a bit ( midge pupa also traditional nymph patterns under an indicator), but weeds remain in enough quantity to limit wet fly fishing in shallower water.  Twenty-Four Mile Reservoir is filling, so give it several days for fishing to pick up using same techniques as on Daniels Reservoir.  Chesterfield Reservoir  also needs some cooler weather to bring water temps down to spread fish out.  Want to catch a grayling? Horseshoe Lake off the Cave Falls Road is the place to do it. They are small (up to 12-13″), pretty, and not as numerous as the rainbow trout present. You will need a non-motorized boat or flotation device to get out in front of the lily pads to present soft hackle, midge and speckled dun life cycle patterns.


Small Streams, September 29th, 2020

Reservoir administrators are capturing water for the next irrigation season.  This means downstream flows will decrease thus driving resident salmonids to deeper water where they find more overhead cover.  Several of our smaller streams with reservoirs are effective by these water collection actions. For the fly-fisher this means concentrating on deeper water. Streamer, weighted nymph, and woolly bugger patterns should be in the fly box.  Such as stripping these through the deep water or suspending such patterns underneath an indicator to drift through that water are effective presentation techniques.


Main Stem Snake River, September 29th, 2020

With flow reduced to normal seasonal amounts, now is the time to walk-in or boat fish the river almost anywhere from Menan to American Falls Reservoir.  It  offers a less crowded alternate to the South Fork and lower Henry’s Fork. Brown trout are starting to migrate to spawning areas, so under low light conditions streamer fishing will be the best way to encounter them. Midge and BWO hatches will provide top water fishing in some locations.  Remember that the river is big and powerful, so wade carefully and do the same if boat fishing ( know where diversions are) is your way to fish.


Henry’s Fork, September 26th, 2020

Brown trout are beginning their runs to spawning areas. The best time to encounter them is in the evening or at first light in the AM. Use streamer and woolly bugger type patterns to encounter them. On windy days look for diminished aquatic insect activity.  When the wind dies and if overcast and cool weather remains the BWO, mahogany dun and midge activity will return.


Henry’s Lake, September 26th, 2020

Surf was up yesterday thanks to the high winds. White caps could be seen from surrounding roads. Conditions there today are likely similar. So be able to swim, bring your surf board and dress in a wet suit.  Surfing may be safer than fishing from a boat on days such as this!  Take weather into account when planning a trip to fish here.


South Fork, September 26th, 2020

Don’t expect to see big aquatic insect hatches during these windy days. Those bugs get blown away before mating and know it.  Cool air temps will also slow down terrestrial insect activity.  So think streamers and nymphs. And be sure to have rubber legs in that fly box. That pattern seems to remain effective throughout the season on the South Fork.


Henry’s Lake, September 19th, 2020

We have not heard much about fishing success other than moderate sized cutts make up the bulk of catches. We do know that as the weather cools off fishing will improve with larger fish moving around the lake. However, look out for windy weather that can whip the surface in near breakers.