Snake River Fishing Report
Week of July 18, 2026 — July 26, 2026
Current Conditions
Teton Troutfitters guides the South Park to Alpine reach. Upriver conditions shown for reference.
The Bureau of Reclamation is maintaining elevated outflows from Jackson Lake Dam to satisfy downstream irrigation demands, with releases holding steady at 4,810 to 5,011 CFS at the Moran gauge. The dam continues to draw from the deep, cold hypolimnetic zone of the reservoir, delivering ice-clear water with 6+ feet of visibility and significantly cooler water temperatures than the unregulated river above the lake. Water temperature at Moran reads 61.7°F — warm but well below the dangerous 68.2°F recorded at the unregulated Flagg Ranch station upstream of the lake. This tailwater reach remains the premier cold-water refuge in the basin during the persistent heat dome. Wading is highly restricted to the immediate gravel-bar margins below the dam. Float fishing is the primary method, with drift-boat operators targeting slow inside seams, micro-eddies, and pocket waters where native cutthroat hold to escape the heavy main currents.
The middle freestone section is flowing at 6,470 CFS at Moose with a gauge height of 11.52 feet, continuing to recede from the June peak of over 8,390 CFS. Water clarity has improved significantly to three to four feet of visibility. However, the dramatic reduction in tributary volume — Pacific Creek has dwindled to 104 CFS, the Buffalo Fork has dropped to 846 CFS, and the Gros Ventre has receded to 498 CFS — has eliminated the cooling effect of natural high-mountain runoff. Daily peak water temperatures at Moose are reaching 63.5°F with dissolved oxygen levels dropping to 7.2 mg/L. Wading remains extremely hazardous in the swift, braided channels. Drift-boat navigation is highly productive, targeting soft inside edges of river bends and slow braided seams where cutthroat can feed on drifting insects without wasting energy in the heavy current.
The lower canyon section continues to experience the highest thermal stress on the river as warm-water tributary inputs from the Hoback River (640 CFS) and the lower Gros Ventre compound the main stem's thermal loading. Water temperatures in this reach are approaching the upper threshold of metabolic tolerance for native cutthroat. Clarity continues to improve as sediment from the spring runoff has largely settled. Wading is extremely dangerous and not recommended. This reach should be avoided entirely during the extreme heat, particularly during peak afternoon temperatures. Experienced rowers who do float this section should focus efforts strictly on the early-morning hours before 10:00 AM, stripping large sculpin streamers or bouncing heavy stonefly nymphs along extreme inside edges and slow bank eddies.
What's Hatching
Golden Stonefly
Heavy6:00 AM – 10:00 AM
The Golden Stonefly hatch has transitioned from midday emergence to an early-morning egg-laying flight. High-density adult females are actively returning to the river along vegetated shorelines at first light, creating heavy surface disturbance that triggers aggressive, predatory rises from cutthroat trout holding in the bankside slack water.
Pale Morning Duns (PMDs)
Heavy8:00 AM – 12:00 PM
Consistent daily dun hatches remain at moderate-to-heavy density in the riffle edges and transitional gravel seams. The compressed snowmelt season has pushed the PMD hatch to sustained peak intensity. Duns are emerging in dense blankets from late morning through midday, producing reliable surface-feeding opportunities in the soft seams and tail-outs.
Caddis (Spotted Sedges)
Heavy6:00 PM – Dusk
Intense evening emergence with dense swarms of pupae and returning adult egg-layers skittering across the surface during the golden hour preceding dusk. This secondary feeding window is producing aggressive, predatory surface rises from both cutthroat and brown trout in fast riffles, tail-outs, and recirculating pools.
Terrestrials (Hoppers, Ants)
Moderate10:00 AM – 2:00 PM
Sustained summer heat and drying bankside grasses are driving increasing numbers of grasshoppers, carpenter ants, and beetles into the river margins. Cutthroat trout are rising eagerly to large, highly buoyant attractor patterns along the willowed banks, particularly where overhanging vegetation channels terrestrial drift.
Blue-Winged Olives (Baetis)
Light7:00 AM – 10:00 AM
Light, localized morning emergences restricted to the upper tailwater sections where cooler water temperatures from the dam release support Baetis activity. Overcast mornings and low barometric pressure windows will intensify sporadic hatches 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 along bankside structure.
Top-water Golden Stonefly match for the early-morning egg-laying flight. Fish tight to vegetated shorelines at first light.
Match the consistent midmorning PMD hatch. Essential for selective cutthroat rising in riffle edges and soft main-channel seams.
Fish the intense evening caddis emergence from 6 PM to dusk in fast riffles, tail-outs, and recirculating pools.
Cast tight to grassy, willowed banks during the midday terrestrial window. High-floating foam body triggers confident, splashy strikes.
Heat-driven ant falls along immediate bankside undercut structure. Dead-drift in the surface film for trout keying on the smaller terrestrial profile.
Fish during localized morning BWO emergences in the upper tailwater. Best on overcast or cool mornings when hatches intensify.
Nymphs & Droppers
Heavy stonefly dropper on 2X–3X fluorocarbon. Target deep pocket water, undercut banks, and swift foam-line seams.
Suspend 1–2 ft below the indicator fly in shallow, active riffle heads to intercept emerging PMDs.
Sleek, fast-sinking attractor for deep, heavy current. Target the top two feet of the water column where cutthroat are holding.
General mayfly dropper. Perfect for target-casting into fast bank pockets and swift seams.
Streamers
Strip along deeper boulder banks under low-light early-morning conditions before the dry-fly window opens.
Swing or strip through heavy runs and deep canyon walls to target territorial brown trout during low-light windows.
Emergers
Micro caddis emerger for selective fish keying on smaller returning egg-layers in foam lines during the evening hatch.
Best Time and Section This Week
Guide's Take
The warm snow drought has compressed the entire dry-fly season into a tighter window, and right now that window is wide open. Golden Stones have shifted to an early-morning egg-laying flight — our guides are watching adult females carpet the bankside willows at first light, and the cutthroat are absolutely destroying them. PMDs are blanket-hatching by 8:00 AM and running strong through midday. The big development this week is the terrestrial bite: Bionic Hoppers and Carpenter Ants are moving fish along the grassy banks in ways we haven't seen this early in other years. We're continuing to run Hoot Owl hours on all guided trips — launching at dawn and coming off the water by 2:00 PM. Every float is focused on the cold tailwater of Reach 1, where dissolved oxygen levels remain healthy and the fish are feeding with full confidence. The evening caddis flights are electric for those who can confirm water temps have dropped, but the morning window is where we're putting clients.
Next Week's Outlook
The extreme heat pattern is expected to persist through mid-week with highs in the mid-to-high 90s before a potential cooling trend sets in. Flows at Moose will continue to recede as the Bureau of Reclamation draws down Jackson Lake to meet downstream irrigation demands. With zero remaining snowpack across the basin, all streamflow is now reservoir-dependent. Golden Stonefly and PMD hatches will hold at peak intensity, while terrestrial hopper and ant activity will continue to build as the summer heat persists. Flat Creek remains closed until its August 1st seasonal opening under catch-and-release, fly-only regulations — mark your calendar. Anglers should continue observing strict Hoot Owl hours and monitoring water temperatures on every outing.
Conservation Note
An Extreme Heat Warning remains in effect across Northwest Wyoming with highs in the mid-to-high 90s. The unregulated Snake River above Jackson Lake has reached 68.2°F at Flagg Ranch — the lethal stress threshold for native cutthroat. Dissolved oxygen at Moose has dropped to 7.2 mg/L, limiting trout recovery from hook-and-line fights. 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 at 68°F. Focus all effort on the cold tailwater of Reach 1 and avoid Reach 3 entirely. Use 2X–3X tippet to land fish quickly and avoid playing trout to exhaustion. Keep all fish in the water, handle only with clean wet hands, use barbless hooks, and release in cold, well-oxygenated current.
Common Questions This Week
What are the best hours to fish the Snake River during the current heat wave?
We are voluntarily observing Hoot Owl hours: fishing from first light (approximately 6:00 AM) and ceasing all angling by 2:00 PM. The prime hatch window runs from 6:00 AM to 12:00 PM, capturing the early-morning Golden Stonefly egg-laying flight and the peak PMD emergence. A secondary evening window from 6:00 PM to dusk offers intense caddis activity, but only if water temperatures have dropped back below 65°F. The afternoon hours between 2:00 PM and 6:00 PM should be avoided completely — this is when water temperatures peak and trout are most vulnerable to thermal stress.
What new fly patterns are producing this week?
The big additions to the fly box this week are terrestrial patterns. The Bionic Hopper (#12, Tan or Purple) is producing explosive bankside strikes as grasshoppers become increasingly active along the drying grasses. The Carpenter Ant (#14) is a deadly dead-drift pattern for trout keying on ant falls along undercut banks. The Gold Chubby Peanut (#8–12) has replaced the standard Stimulator as the go-to Golden Stonefly surface match. For the evening caddis window, the Corn-fed Caddis (#18–20) is a micro emerger pattern that targets selective fish in foam lines.
When does Flat Creek open for fishing?
Flat Creek — the highly technical, spring-fed cutthroat fishery in Jackson — remains completely closed until its scheduled seasonal opening on August 1st. The creek will run through October 31st under fly-fishing-only, catch-and-release regulations. This delayed opening allows the creek's sensitive native fine-spotted cutthroat trout to complete their spawning cycles and find thermal refuge in the deep, spring-fed pools without angling pressure during the hottest weeks of summer.
Golden Stones are carpeting the banks at first light, PMDs are blanket-hatching by 8:00 AM, and hoppers and ants are producing explosive strikes along the willows. Our guides are running early-launch Hoot Owl floats on the cold tailwater — the early-morning dry-fly fishing is the best of the season. Book your dawn float before the remaining summer dates fill up.
