Snake River Fishing Report
Week of May 10, 2026 — May 17, 2026
Current Conditions
Teton Troutfitters guides the South Park to Alpine reach. Upriver conditions shown for reference.
The most stable and pristine conditions in the basin. The Jackson Lake Dam is maintaining a controlled discharge of approximately 1,280 CFS, providing ideal flow for both wade and float access. Water temperatures hover in the low 40s, and visibility exceeds six feet — unmatched anywhere else on the river. This clarity creates world-class sight-fishing opportunities in the slower-moving water near the Oxbow and the long, glassy glides above Moose, though it also increases fish wariness. Anglers should adopt a stealthy approach with longer leaders and low-profile casting positions. Wade fishing is excellent across the entire stretch at the current flow.
The iconic braided heart of the Snake River, currently flowing at 1,440 CFS at the Moose gauge. Water temperatures are rising into the 43–47°F range, triggering the most significant insect emergences of the spring. Clarity remains good at approximately five feet but is increasingly susceptible to diurnal fluctuations as the Gros Ventre begins pulling sediment from the foothills during warm afternoons. The fishing is focused on extensive side channels and foam lines where cutthroat trout are congregating in high densities to feed on midges and BWOs. Wade fishing remains manageable in the upper portions near Moose, but the braided character increasingly favors float fishing to cover the distance between productive side channels.
The most volatile segment of the fishery. Estimated flows in the canyon exceed 3,130 CFS, driven by the Hoback River contributing approximately 600 CFS of colder, sediment-heavy water. Clarity has dropped to a fair level of three to four feet and is expected to deteriorate further as the week progresses. This is a big-bug, big-fish environment where the largest brown trout in the system are feeding aggressively on Skwala stonefly nymphs and emerging Baetis. Wadeability is difficult to dangerous — strictly float-only for experienced guides and boaters. Target the deep ledge-rock troughs and slower water behind large boulders with heavy nymph rigs and streamers.
What's Hatching
Midges (Chironomidae)
Heavy10 AM – 1 PM
Sustained cold-water photoperiod and solar radiation warming the surface film. Midges congregate in back eddies and foam lines, providing a low-effort food source for trout. The midge-to-BWO transition through midday creates a sustained feeding window.
Skwala Stoneflies
Light1 PM – 4 PM
Tapering. Afternoon thermal peak (45°F+) triggering adult migration to the banks for mating. The hatch is nearing its conclusion, but trout memory of these large insects remains strong, making large dry-fly patterns effective as attractors even when naturals are sparse. Last call for Skwala dries this season.
Blue-Wing Olives (Baetis)
Heavy11 AM – 3 PM
The primary event for technical anglers this week. Barometric pressure drops and overcast skies coupled with water temps of 42–47°F trigger emergence. These mayflies remain on the surface longer before their wings dry in humid conditions, giving trout an extended feeding window. Strongest on overcast days. Sizes 18–22.
March Browns
Sporadic12 PM – 3 PM
Stabilization of water temperatures above the 43°F threshold in faster riffle sections. Sporadic but increasing — these larger mayflies indicate the river ecology is advancing toward its summer peak. A #14 Parachute Adams covers them.
Caddis
Sporadic1 PM – 4 PM
Early-season Brachycentrus species emerging as valley floor temperatures exceed 70°F. The first caddis of the season — trout are keying on afternoon emergers more than fully emerged adults. Sizes 16–18.
What's Producing
Dry Flies
The most productive fly for the midday BWO hatch. The CDC wing imitates a crippled natural sitting in the film — perfect for committed risers in foam lines and tailouts. Fish single on 5X.
Essential for fishing midge clusters in slow foam lines and back eddies. When you see clusters forming on the surface in braided side channels, this is the right call.
Fish tight to the banks on warm afternoons to capitalize on the last of the Skwala activity. Last call on this rig for the season.
A versatile attractor for faster riffles where March Browns and early caddis are appearing. Covers multiple hatches when fish are not being selective.
An excellent BWO emerger pattern for selective fish in the flat water of Reach 1. Rides low in the film to imitate a natural struggling to emerge.
Nymphs & Droppers
The primary anchor fly for deep nymphing. Imitates migrating Skwala and Golden Stone nymphs. Also effective as a dropper below a large Skwala dry.
Highly effective trailing dropper to imitate active Baetis nymphs ascending through the water column right before emergence.
Red is currently outperforming black. Use in slow, deep seams during the morning window before the BWO hatch gets going.
A heavy, fast-sinking nymph for reaching trout in the deeper ledge-rock troughs of Reach 3. Gets down quickly in the high-volume canyon water.
A subtle, technical pattern for sight-fishing in the ultra-clear water below the dam. Dead-drift in the film for picky risers in Reach 1.
Streamers
The go-to pattern for the canyon (Reach 3). Fish on a sinking tip near structure — the larger brown trout are keyed on baitfish profiles in the off-color water.
A reliable low-light or early-morning option when water clarity is marginally reduced. Strip-and-pause retrieve along the banks.
Effective in Reach 2. Target bank-side undercuts and the heads of deep pools where larger fish hold.
Emergers
Swing through riffle tails when you see fish swirling but not taking duns from the surface. The wet-fly swing imitates an emerging mayfly struggling to break through the film.
Specifically for the technical sight-fishing window in Reach 1 before the BWO hatch begins. Fish in the surface film in slow eddies.
Best Time and Section This Week
Guide's Take
The Snake is currently offering a last call for clear-water dry-fly fishing before the inevitable spring runoff takes hold. What has been most surprising this week is the early intensity of the BWO hatch — the trout are keyed in on these tiny mayflies with an aggression usually reserved for summer stoneflies. I am most excited about the overcast forecast for later in the week; those grey days are going to trigger absolute carpet hatches of BWOs in the braids below Moose. If you are looking for that classic Jackson Hole sight-fishing experience, now is the time to be on the water — once the Hoback and the Gros Ventre really start pushing, the game changes to heavy lead and sinking tips.
Next Week's Outlook
Expect river flows to increase significantly across all reaches as the unseasonably warm daytime temperatures continue to melt the mid-to-high elevation snowpack. This influx will likely result in a marked decrease in water clarity, particularly in Reach 2 and Reach 3, where tributary inputs will introduce increasing amounts of spring turbidity. While BWO and midge activity will persist, the window for technical dry-fly fishing is narrowing rapidly — anglers should expect a shift toward more subsurface-oriented tactics. Booking urgency is high for any clients wishing to avoid the full 8-week runoff phase that traditionally begins in mid-to-late May.
Conservation Note
Anglers should be aware that native Snake River fine-spotted cutthroat trout are currently in their pre-spawn feeding window and are highly susceptible to stress as water temperatures begin to rise. It is critical to use barbless hooks to facilitate quick releases and to keep the fish in the water at all times during handling. Furthermore, be mindful of the potential for spawning activity in the tributary mouths and shallower side channels as we move into June — avoid wading in areas with clean, pea-sized gravel which may indicate the presence of trout redds.
Common Questions This Week
Is the river currently safe for walk-and-wade fishing?
Yes, particularly in Reach 1 and the upper portions of Reach 2, where flows are currently below 1,500 CFS. The Jackson Lake Dam tailwater section is exceptionally wadeable right now. However, Reach 3 through the canyon is flowing over 3,000 CFS and should be considered float-only due to high velocity and limited bank access.
Which hatch should I prioritize if I only have one afternoon to fish?
You should prioritize the Blue-Wing Olive (BWO) hatch. It is the dominant entomological event this week, typically occurring between 11 AM and 3 PM. Target the slower seams and foam lines in the braids below Moose for the best chance at rising fish. Tie on a CDC Comparadun BWO #18 on 5X.
How will the forecasted 80-degree temperatures affect the fishing?
The high heat early in the week will likely trigger an increase in flow volume and a decrease in clarity by Thursday as mid-elevation snowmelt accelerates. While the morning fishing will remain productive, the late afternoon may see some coloring of the water in Reach 2 and Reach 3. Focus on the upper tailwater (Reach 1) if you want to ensure consistent clarity during this warming trend.
This is the last clean week before runoff. Heavy BWO hatches, ice-clear tailwater, and a closing window on Skwala dries — book now to fish the Snake before it goes big and brown.
