Snake River Fishing Report
Week of May 18, 2026 — May 24, 2026
Current Conditions
Teton Troutfitters guides the South Park to Alpine reach. Upriver conditions shown for reference.
The controlled release from Jackson Lake Dam has been bumped to 2,730 CFS, with flows building to 4,160 CFS by the time they reach the Moose gauge due to unregulated inputs from Pacific Creek and the Buffalo Fork. Water clarity remains exceptional below the dam, with visibility extending over six feet thanks to the deep-water release, though it tapers slightly downstream. Wadeability is good on the stable gravel bars near the dam but becomes highly restricted as flows build toward Moose — floating is the far safer and more effective option. Cutthroat trout are actively staging in slower seams, back eddies, and soft water behind mid-river boulders to feed on dense midday hatches.
Flows are holding at 4,160 CFS and rising rapidly, with water clarity averaging a fair three to five feet of visibility as early snowmelt and sediment enter from the Gros Ventre River and Flat Creek. Wadeability is poor and highly hazardous due to the heavy volume, swift current, and shifting gravel in the braided channels. This reach hosts high trout densities in a classic braided float environment. Drift-boat anglers must focus presentations on grassy cut banks, slow braided seams, and the calm water behind structure where cutthroats seek refuge from the heavy main current. Wading should be avoided due to safety concerns.
The lower reach is surging past 6,860 CFS as the Hoback River contributes approximately 1,160 CFS of turbid snowmelt. Water clarity is muddy and off-color, dropping below one to two feet of visibility as major tributary inputs blow out the main stem. Wadeability is completely unfishable and extremely dangerous. Viable tactics are limited to stripping large, dark streamers or drifting heavy stonefly nymphs along the extreme inside edges and slow bank eddies where large brown trout seek refuge. Only experienced drift-boat operators should attempt this section — conditions are bordering on blown out.
What's Hatching
Blue-Wing Olives (Baetis)
Heavy10:00 AM – 3:00 PM
Triggered by cool water temperatures (42–48°F) and low-light conditions. Overcast, drizzly, or humid days prompt massive synchronized emergences in slow tailwater seams. The headline hatch this week — the early-week low-pressure system will produce ideal BWO conditions.
Midges (Chironomidae)
Moderate9:00 AM – 11:00 AM & late afternoon
Active year-round but heavily concentrated in spring. Peak emergence triggered by stable morning water temperatures (38–42°F) and consistent spring photoperiods. Concentrated in back eddies and slow tailouts — the morning midge window leads directly into the BWO emergence.
Skwala Stoneflies
Moderate11:00 AM – 3:00 PM
Tapering but still present. Sparked by water temperatures climbing consistently into the 45–48°F range. Adults crawl onto bankside vegetation and flutter across the water on warmer afternoons. Fish tight to the banks on the warmest days this week.
Caddis (Grannoms)
Sporadic4:00 PM – 8:00 PM
Early-season Brachycentrus species triggered by late-afternoon water warming above 48°F and expanding daylight. Early caddis flutter near the banks as afternoon temperatures peak. Trout key on emergers more than adults right now.
What's Producing
Dry Flies
The premier dry fly for overcast BWO emergences. Fish on a long, fine 12-to-15-foot leader tapered to 5X–6X in slow seams and back eddies. Drag-free drift is critical in the clear tailwater.
Skwala/attractor pattern. Best fished close to grassy banks, inside seams, and slow braided runs where adult stoneflies are blown into the water. Doubles as an indicator for a nymph dropper.
Designed for late-afternoon and evening caddis activity. Skate or dead-drift in the surface film along slower bank lines as the early caddis begin to show.
Nymphs & Droppers
A heavy stonefly nymph that serves as an excellent anchor. Bounce along the bottom in deep runs and off-color water to target deep cutthroats. Tan/brown is the hot color.
A highly versatile, fast-sinking attractor nymph in olive. Perfect as a point fly in deeper runs or in the slightly turbid water below Moose.
Highly realistic early stonefly nymph in brown. Dead-drift through deep, broken riffles and rocky runs where Skwala nymphs are still migrating.
Essential subsurface BWO imitation. Best fished on a tight-line or Euro-style rig through the deep, clear seams of the upper tailwater below the dam.
Dominant midge pupa pattern. Dead-drift in back eddies and slow tailouts where midges naturally concentrate during the morning window.
Streamers
The absolute go-to for off-color water. Swing and strip aggressively along grassy cut banks and behind boulders to trigger big browns in the canyon. Sculpin color.
Best on high-volume, overcast afternoons in turbid water. Slow-strip through deep pools and soft inside seams to move the biggest fish in the system.
Emergers
Highly effective in the surface film on overcast days. Present drag-free to trout actively sipping just below the surface during the BWO emergence.
Slim, sparse hybrid nymph/emerger. Suited for the clear Dam-to-Moose reach where trout have a long look at the fly. Dead-drift in slow current lanes.
Features a slim profile and dark wing pad. Fish as a trailing dropper in slow current lanes right before the afternoon BWO hatch kicks off.
Best Time and Section This Week
Guide's Take
We are experiencing a highly unique spring transition on the Snake. The warm snow drought is compressing the season, meaning the clear-water tailwater of Reach 1 is providing some of the most technical and rewarding fishing of the year. The sheer density of the midday Blue-Winged Olive hatches on overcast days has been spectacular, with fine-spotted cutthroat trout rising eagerly in the slow, glassy eddies. While downstream reaches are rapidly succumbing to early snowmelt, focusing efforts on the pristine flows below Jackson Lake Dam offers an exceptional opportunity to experience world-class dry-fly fishing before full runoff engulfs the entire valley.
Next Week's Outlook
Flows across all reaches are projected to rise significantly next week as weekend high temperatures near 74°F accelerate high-elevation snowmelt, pushing the river deeper into its full spring runoff cycle. Hatch activity for Blue-Winged Olives and midges will remain highly concentrated but restricted strictly to the stable tailwater below the dam, while downstream sections will become increasingly off-color and difficult to fish. Due to this rapidly narrowing window of high-clarity water, booking urgency is extremely high for anglers looking to secure remaining guide dates on the controlled upper reach before complete valley-wide runoff limits fishing options.
Conservation Note
Water temperatures remain exceptionally cold, ranging from 41°F to 48°F, which keeps native trout highly active and free from heat-induced metabolic stress. However, native fine-spotted Snake River cutthroat trout are currently in their spring spawning window. Anglers must fish ethically by avoiding shallow, clean gravel beds in side channels where spawning redds are present, using barbless hooks, wetting hands before handling, and keeping trout fully submerged to ensure a safe release.
Common Questions This Week
Is the lower Snake River below Moose still wadeable given the rising spring flows?
Wadeability is highly reach-dependent this week. The tailwater section from Jackson Lake Dam to Moose is still wadeable along slow inside gravel bars, though wading is increasingly restricted as flows have risen to 2,730–4,160 CFS. Below Moose, flows are surging past 5,000 CFS with heavy tributary input, making wading extremely dangerous and effectively limiting fishing strictly to float trips. Wading is highly discouraged on the lower sections.
What is the single most productive dry fly setup during the midday window?
Target the heavy Blue-Winged Olive emergence with a size 22 Parachute BWO or Barr's Flashback Emerger. Given the crystal-clear water conditions in Reach 1, trout have a prolonged window to inspect the fly, requiring a long, delicate 12-to-15-foot leader tapered to 5X or 6X fluorocarbon. Achieving a perfect, drag-free drift in the slower seams and back eddies is critical to triggering strikes from feeding cutthroats.
How is the 2026 warm snow drought going to affect fly fishing trips later this summer?
The Snake River Basin has experienced a warm snow drought, with normal overall precipitation but extremely low snow accumulation, resulting in a current basin SWE index of only 38% of median. This means peak spring runoff will occur much earlier and be highly compressed, allowing rivers to clear and become fishable earlier in June than normal. However, the lack of late-season snowpack reserves will likely lead to exceptionally low flows and warm water temperatures by August, compressing the prime summer dry-fly window.
The warm snow drought is compressing the pre-runoff window fast. World-class BWO hatches in ice-clear tailwater — but only on the upper reach, and only for a few more days. Book now before full valley runoff shuts the door.
