Snake River Fishing Report
Week of July 26, 2026 — August 2, 2026
Current Conditions
Teton Troutfitters guides the South Park to Alpine reach. Upriver conditions shown for reference.
The tailwater section below Jackson Lake Dam down to the Pacific Creek confluence remains the most stable trout habitat in Jackson Hole. The Bureau of Reclamation is maintaining a controlled discharge of approximately 4,910 CFS, with hypolimnetic reservoir releases delivering gin-clear visibility exceeding six feet. Morning water temperatures at the Moran gauge read 61.7°F, maintaining active feeding behavior throughout the day. Cutthroat trout are concentrated along inside braided seams, deep cobble runs, and willow-lined undercut banks. Walk-and-wade angling is viable directly below the dam outlet on gravel bars, though heavy flows require caution. Drift-boat floats are highly favored, with anglers targeting dry-dropper rigs in soft pocket water behind downed timber and along willow edges.
As the Snake River absorbs flow from Pacific Creek (~104 CFS) and the Buffalo Fork (~846 CFS), total volume increases to 6,190–6,470 CFS at Moose Bridge with a stage height of 11.42–11.52 feet. Clarity remains high at four to five feet of visibility. The river throughout Grand Teton National Park displays classic braided-freestone morphology — expansive gravel bars, logjams, fast island chutes, and broad recirculating eddies. Drift boats provide the most effective coverage, with oarsmen holding lines 10 to 15 feet off cut-banks to enable anglers to cast dry-dropper setups into soft pocket water. Cutthroat hold primarily in current velocities of 1.5 to 2.5 mph, avoiding the stronger central channel. Golden Stonefly activity continues along vegetated banks during morning hours, after which trout transition to feeding on PMD duns and emergers in side-channel riffles.
Below Moose Bridge, the river receives additional volume from the Gros Ventre River (~498–586 CFS) and Flat Creek (~136–144 CFS), bringing total flow to 7,190–7,330 CFS near South Park. Water clarity averages three to four feet. This reach consists of sweeping bends, deep gravel drop-offs, and the steep walls of Snake River Canyon approaching Alpine. Thermal management is essential — by 1:30 PM, surface water temperatures below South Park Bridge approach 68°F, placing elevated metabolic stress on caught fish. Anglers should launch at first light and complete fishing by 1:00 PM. Morning fishing is productive along shadow-lined canyon walls and deep bankside troughs. Streamers — Sculpzillas, Sparkle Minnows, or Double Bunnies retrieved on intermediate sink-tips — trigger reaction strikes from cutthroat and resident brown trout along deep drop-offs before 10:00 AM.
What's Hatching
Pale Morning Duns (PMDs)
Heavy8:00 AM – 12:00 PM
PMDs are the predominant mayfly hatch across the system and have reached their annual peak. Nymphs migrate toward shallow gravel riffles and mid-river seams mid-morning, with dense dun surface flights peaking between 8:00 AM and noon. Cutthroat are keying on emergers trapped in the surface film in glassy tailouts and back-eddy foam lines.
Terrestrials (Hoppers, Ants, Beetles)
Heavy10:00 AM – 3:00 PM
Terrestrial activity has reached heavy levels as summer heat dries valley floor vegetation. Grasshoppers in the #10–14 size class are abundant in grassy meadows, while carpenter ants and foam beetles are being pushed into margin currents by thermal updrafts and afternoon wind gusts. Cutthroat are adjusting holding positions, feeding within inches of steep dirt banks and overhanging willows to intercept falling terrestrials.
Caddis (Spotted Sedges)
Heavy6:00 PM – 8:30 PM
Intense evening flights of spotted sedges and tan caddis intensify between 6:00 PM and 8:30 PM. Egg-laying females skittering across glassy tailouts trigger rapid, aggressive rise forms from fine-spotted cutthroat. This secondary evening feeding window remains electric for anglers who confirm water temperatures have dropped.
Golden Stonefly
Moderate6:00 AM – 10:00 AM
While peak emergence occurred in late June and early July, mature adult stoneflies remain along willow-heavy banks and river-edge vegetation. Females are actively ovipositing during warm morning hours, prompting surface rises in bankside eddies and foam lines. The hatch is transitioning to late-season status but still producing consistent morning surface activity.
Yellow Sallies
Moderate11:00 AM – 3:00 PM
Small stoneflies are emerging continuously through the afternoon. Adults flutter over moderate-velocity currents and riffle heads, providing a consistent food source when the main mayfly hatches taper off midday.
Blue-Winged Olives (Baetis)
Light7:00 AM – 10:00 AM
Light emergences during early morning hours or during passing afternoon cloud cover, soliciting subtle rise forms in low-velocity backwaters. Best during overcast conditions when barometric pressure drops.
What's Producing
Dry Flies
Primary foam attractor and dry-dropper anchor for the morning Golden Stonefly egg-laying window. Fish tight to vegetated banks and willow edges at first light.
Cast tight to grassy banks, steep dirt cut-banks, and overhanging willows during peak terrestrial hours. Triggers explosive, confident strikes.
Match the peak PMD hatch in riffle edges, tailouts, and foam lines. Essential from 8:00 AM through noon when duns blanket the surface.
Fish the intense evening caddis flights from 6:00 PM to 8:30 PM in fast riffles, tailouts, and recirculating pools.
Dead-drift along undercut banks and willow edges where heat-driven ant falls are channeling terrestrial drift into the margins.
Target moderate-velocity riffle heads and pocket water where sallies are fluttering and ovipositing through the afternoon.
Fish during early-morning or cloudy-afternoon BWO emergences in glassy backwaters and low-velocity foam lines.
Nymphs & Droppers
Heavy stonefly dropper set 24–36 inches below the dry fly on 3X–4X fluorocarbon. Target deep pocket water, undercut banks, and swift foam-line seams.
Suspend below the indicator fly in shallow, active riffle heads to intercept emerging PMD nymphs during the peak morning hatch.
Sleek, fast-sinking attractor for deep cobble runs and swift seams. Drops to depth quickly in heavy 6,000+ CFS mainstem current.
General mayfly dropper for target-casting into fast bank pockets and mid-river seams.
Streamers
Strip on intermediate sink-tips along steep canyon drop-offs and deep bank structure during the early-morning streamer window (6:00–8:00 AM).
Retrieve near deep structure and boulder banks under low-light conditions. Triggers reaction strikes from cutthroat and resident brown trout.
Emergers
Micro caddis emerger for selective fish keying on smaller returning egg-layers in glassy tailouts during the evening flight.
Best Time and Section This Week
Guide's Take
We're entering the sweet spot of the summer season. PMDs are at absolute peak — dense blanket hatches from 8:00 AM through noon are putting every cutthroat in the river on the surface. But the real story this week is the terrestrial bite. Hoppers, ants, and beetles have gone from a supporting cast to a headline act. We're watching cutthroat hold within inches of steep dirt banks and overhanging willows, intercepting every grasshopper and carpenter ant that hits the water. The Gold Chubby Peanut to Pat's Rubber Legs dry-dropper rig remains the workhorse setup, but our guides are spending more time each day with a Bionic Hopper or Carpenter Ant on the end of the tippet. The evening caddis flights are still electric from 6:00 to 8:30 PM. We continue to run Hoot Owl hours, with all guided trips launching at dawn and focused on the cold tailwater of Reaches 1 and 2. The August 1 Flat Creek opener is just days away — it's going to be a special week.
Next Week's Outlook
The August 1 opening of Flat Creek on the National Elk Refuge is the marquee event of early August. This highly technical, spring-fed cutthroat fishery will open under strict fly-fishing-only, catch-and-release regulations, drawing anglers to fine-tippet sight-fishing with PMDs, Tricos, micro-caddis, and small terrestrials on 5X–6X fluorocarbon. On the mainstem Snake, terrestrial fishing will dominate surface activity as valley vegetation continues to dry. PMDs will sustain at peak intensity through early August. Golden Stoneflies are winding into their late-season phase but still producing morning surface takes. Flows will continue to recede as Jackson Lake storage declines. Strict time-of-day discipline remains essential, particularly on Reach 3 where afternoon temperatures approach 68°F.
Conservation Note
Afternoon water temperatures below South Park Bridge are reaching 68°F (20.1°C) — the threshold of severe metabolic stress for native cutthroat. When water exceeds 68°F, trout experience anaerobic acidosis and cannot recover from a hook-and-line fight, leading to delayed mortality even if the fish swims away. On Reach 3, complete all fishing by 1:00 PM. On Reaches 1 and 2, cease angling by 2:00 PM. Replace fine tippets (5X/6X) with heavier 3X–4X fluorocarbon to keep fight times under 60–90 seconds. Keep fish fully submerged in rubber-mesh landing nets. Do not remove fish from the water for photographs when air temperatures exceed 80°F. Use barbless hooks and release in cold, well-oxygenated current.
Common Questions This Week
What is the daily fishing timeline on the Snake River this week?
The fishing day breaks into distinct windows based on water temperature and hatch activity. From 6:00 to 8:00 AM (water 58–61°F), strip streamers and deep nymphs along bank drop-offs. From 8:00 to 11:00 AM (water 61–64°F), the Golden Stonefly egg-laying flight and peak PMD emergence drive surface feeding. From 11:00 AM to 2:00 PM (water 64–67°F), terrestrial hoppers and ants dominate along grassy banks. From 2:00 to 6:00 PM, cease all fishing on the lower river — water temperatures peak above 68°F. From 6:00 to 8:30 PM (water cooling), the evening caddis flight offers a secondary dry-fly window.
What do I need to know about the Flat Creek opening on August 1?
Flat Creek through the National Elk Refuge opens Saturday, August 1st under strict trophy regulations: artificial flies only, 100% catch-and-release. This is a highly technical spring creek requiring stealthy approaches, long leaders (12 to 15 feet ending in 5X or 6X fluorocarbon tippet), and low-profile dry fly patterns. Primary hatches on opening day include Pale Morning Duns (#16–18), micro-caddis (#18–20), terrestrials — flying ants and small hoppers (#14–16) — and early morning Trico spinner falls (#20–22). Pre-opener streamflow is stable at 136–144 CFS with cool groundwater temperatures.
What is the best dry-dropper setup for current conditions?
The standard mainstem rig starts with a size 8–10 Gold Chubby Peanut as the dry-fly anchor, trailing a heavy Tungsten Pat's Rubber Legs (#6) on 24 to 36 inches of 3X–4X fluorocarbon tippet. This setup covers the morning Golden Stonefly and general attractor window. When cutthroat shift to PMDs mid-morning, swap the dropper to a Tungsten Split Case PMD (#18–20) set 12–18 inches below. During the midday terrestrial window, switch the top fly to a Tan Bionic Hopper (#12) or Parachute Carpenter Ant (#14) and fish tight to grassy banks.
PMDs are blanket-hatching at peak density, hoppers and ants are producing explosive bankside strikes, and the evening caddis flights are electric. Flat Creek opens August 1 for trophy sight-fishing. Our guides are running early-launch floats on the cold tailwater — the morning dry-fly fishing is the best of the summer. Book your float before the August dates fill up.
