Snake River Fishing Report
Week of July 12, 2026 — July 18, 2026
Current Conditions
Teton Troutfitters guides the South Park to Alpine reach. Upriver conditions shown for reference.
The upper tailwater is regulated by a controlled release of approximately 4,900 CFS from Jackson Lake Dam, holding steady at 4,910 CFS at the Moran gauge. The dam is drawing from the deep, cold hypolimnetic zone of Jackson Lake Reservoir (82% of live storage capacity), delivering ice-clear water with 6+ feet of visibility and exceptionally cold water temperatures between 45°F and 53°F. This tailwater reach serves as a vital cold-water thermal refuge during the extreme heat dome, sheltering native cutthroat from dangerous ambient temperatures affecting the lower river. Wading is highly restricted to the immediate gravel-bar margins below the dam. The fishing character is defined by technical dry-fly matches in flat seams, glassy eddies, and deep pool tail-outs where native fine-spotted cutthroat rise eagerly to emerging hatches. Drift-boat float trips are highly favored.
The middle freestone section is flowing at 6,610 CFS at Moose with a gauge height of 11.57 feet, falling steadily from a June peak of over 8,390 CFS and forecast to recede toward 5,702 CFS by mid-week. Water clarity is excellent at four to five feet of visibility. However, warm-water contributions from Pacific Creek (218 CFS) and the Buffalo Fork (1,290 CFS) are accelerating thermal loading, driving daily peak water temperatures at Moose to 61°F. Wading remains extremely hazardous in the swift, braided channels. Drift-boat navigation is highly productive along this reach, with anglers targeting slow braided seams, grassy cut banks, and the calm water behind woody debris. Anglers must monitor water temperatures closely and voluntarily cease fishing by 2:00 PM when thermal stress peaks.
The lower canyon section is flowing at approximately 7,750 CFS below Flat Creek, with water temperatures peaking at 63°F. The Hoback River has dropped to a clear 640 CFS and the Gros Ventre is running at 557 CFS, allowing sediment to settle and clarity to continue improving. This reach is experiencing the highest thermal stress on the river and should be avoided during the extreme heat dome, especially during peak afternoon temperatures. Wading is extremely dangerous and not recommended. For experienced rowers who do float this section, focus angling efforts on the early morning hours before 2:00 PM, stripping large sculpin streamers or bouncing heavy stonefly nymphs along the extreme inside edges and slow bank eddies.
What's Hatching
Golden Stonefly
Heavy11:00 AM – 3:00 PM
Rising water temperatures in the mid-50s trigger a massive shoreward migration of nymphs, prompting heavy shoreline adult emergence. Nymphs are migrating extensively along the substrate toward the banks, making them highly vulnerable to subsurface drift.
Pale Morning Duns (PMDs)
Heavy10:00 AM – 2:00 PM
PMD hatch has reached its annual peak. Nymphs are highly active in transitional gravel seams, with duns emerging in dense blankets from late morning through early afternoon. During overcast periods or thundershowers, massive spinner falls and dun hatches occur simultaneously, causing cutthroat to feed selectively on the surface.
Caddis (Spotted Sedges)
Heavy6:00 PM – 8:30 PM
Warm evening air temperatures stimulate dense swarms of caddis adults skittering across the surface during the "magic hour" preceding dusk, prompting aggressive, predatory surface rises from both cutthroat and brown trout.
Yellow Sallies
Moderate11:00 AM – 4:00 PM
Hatching in steady numbers, providing a smaller, bright-yellow profile that trout actively seek during high-light periods in riffle heads and bankside pocket water.
Terrestrials (Hoppers, Ants)
Moderate12:00 PM – 4:00 PM
Sustained summer heat and drying bankside grasses are driving early-season grasshoppers, carpenter ants, and beetles into the river margins along immediate bankside undercut structure.
Blue-Winged Olives (Baetis)
Sporadic12:00 PM – 3:00 PM
Highly sensitive to low barometric pressure; localized emergences triggered by cool, overcast, or rainy afternoons during mid-week thundershower periods in glassy backwaters and foam lines.
What's Producing
Dry Flies
Primary attractor and dry-dropper anchor. Foam body supports heavy tungsten droppers; profile mimics Golden Stones and terrestrials.
Match the heavy midday golden emergence; fish tight to willow-covered banks and fast seams.
Essential during the peak PMD hatch; use for selective cutthroat rising in slow eddies and main-channel seams.
Fish during the magic hour caddis return (6–8:30 PM) in fast riffles, tailouts, and recirculating pools.
Cast into fast riffle seams and bankside pocket water where sallies are actively ovipositing.
Evening high-visibility dry fly. Maintains visual contact during the peak caddis rise as light fades.
Nymphs & Droppers
Heavy stonefly nymph mimicking migrating Golden Stonefly nymphs. Fish on a short 2–3 ft dropper of 3X–4X fluorocarbon tight to fast bank seams.
Fast-sinking general mayfly dropper. Perfect for target-casting into fast bank pockets and swift seams.
Suspend 1–2 ft below the indicator fly in shallow, active riffle heads to target emerging PMDs.
Sleek, epoxy-coated body designed to drop immediately to the bottom in deep, heavy current.
Streamers
Cast and retrieve near deep structure and banks under low-light or early-morning conditions.
Swing or strip through heavy runs and deep canyon walls to target territorial brown trout.
Emergers
Highly effective during the peak midday PMD hatch when trout reject fully winged adult duns.
Tie on during cool, overcast, or rainy afternoon periods when thundershowers trigger localized BWO emergences.
Best Time and Section This Week
Guide's Take
This is both the most exciting and the most challenging week of the season. A record-tying 99°F heat dome has settled over Jackson Hole, and the warm snow drought means there is zero snowpack left to buffer our streams. The hatches, however, are absolutely electric — PMDs are blanket-hatching at densities we haven't seen in years, Golden Stones are crawling the banks, and the evening caddis flights are triggering aggressive, splashy rises well past 8:30 PM. Our guiding team is voluntarily restructuring all trips to Hoot Owl hours, launching at first light and coming off the water by 2:00 PM. We are focusing all float trips on the cold-water tailwater of Reach 1, where dam releases are keeping temps safely in the 45–53°F range. The fishing in that early window is world-class — the cutthroat are completely unschooled and rising with total confidence.
Next Week's Outlook
The extreme heat dome will break mid-week as a convective pattern moves in Tuesday through Thursday, dropping highs from 99°F to the mid-80s with scattered thundershowers. This cooling will provide critical relief to the river's thermal profile and trigger heavy BWO and PMD hatches during overcast windows. Flows at Moose are forecast to recede toward 5,700 CFS by mid-week. Golden Stonefly and PMD hatches will continue at peak intensity, while terrestrial grasshopper activity will steadily build as the summer heat persists. Anglers should continue observing early-morning starts and monitoring water temperatures closely.
Conservation Note
An Extreme Heat Warning is in effect through July 13, with air temperatures reaching 99°F. This poses a severe biological challenge to native cutthroat trout. We are voluntarily observing Hoot Owl hours — fishing from 6:00 AM to 2:00 PM only. Carry a digital water thermometer and cease fishing immediately if water temperatures reach 68°F. Focus all effort on the cold tailwater of Reach 1 and avoid Reach 3 entirely. Upsize tippet to 3X–4X fluorocarbon to land fish quickly and minimize oxygen debt. Never remove a trout from the water for photography during extreme heat. Submerge the fish fully in the net, release with barbless hooks, and allow the fish to revive in cold, moving water before release.
Common Questions This Week
What are Hoot Owl hours, and why is Teton Troutfitters observing them this week?
Hoot Owl hours mean fishing from first light (approximately 6:00 AM) and voluntarily ceasing all angling by 2:00 PM. We are observing them because a record-tying 99°F heat dome is driving afternoon water temperatures above 61°F on the lower river. When water exceeds 65°F, trout experience severe physiological stress — their metabolic rate spikes while dissolved oxygen drops, leading to high post-release mortality. By fishing only in the cooler morning hours and focusing on the cold tailwater of Reach 1, we protect our native cutthroat while still enjoying world-class dry-fly fishing.
What is the most effective fly setup during the current peak hatch window?
The most productive setup is a dry-dropper rig using a size 10–12 Chubby Chernobyl (purple, tan, or gold) as the primary attractor and indicator. Drop a heavy Tungsten Pat's Rubber Legs (#6) on a short 2–3 foot dropper of 3X–4X fluorocarbon tight to fast bank seams to target migrating Golden Stonefly nymphs. When cutthroat are rising selectively to PMDs, switch to a size 16–20 PMD Sparkle Dun or Cripple with a size 18–20 Tungsten Split Case PMD trailing 1–2 feet below.
Where should anglers focus during the extreme heat to protect the fishery?
Focus all angling effort on Reach 1 (Jackson Lake Dam to Moose), where the dam's deep, cold hypolimnetic release maintains water temperatures safely between 45°F and 53°F with 6+ feet of visibility. Avoid the lower freestone sections of Reach 3 (below South Park) and unshaded tributary channels where water temperatures are highest. Carry a calibrated water thermometer and cease fishing immediately if readings reach 68°F on any section.
PMDs are blanket-hatching at peak density, Golden Stones are crawling the banks, and the evening caddis flights are electric. Our guides are running early-morning Hoot Owl shifts on the cold tailwater — the fishing in that window is world-class. Book your early-launch float before the remaining summer dates fill up.
