Snake River at 50°F and 2,880 cfs — Tetons cutthroat season hits prime window

What's Biting

What's Next

**Flow and Temperature Outlook**

The Snake at Moran (USGS 06192500) is running 2,880 cfs at 50°F as of Sunday morning — a window that typically holds two to four weeks before snowmelt from the Teton high country pushes flows into the 6,000–12,000 cfs range that defines June in this drainage. Expect flows to tick upward daily as daytime temperatures warm the snowpack. Once the gauge climbs above roughly 4,000–5,000 cfs, wade access narrows sharply; anglers should identify back-channel sloughs, eddies behind gravel bars, and inside river bends now — those are the zones that hold fish even as the main current surges. On higher-water days, a drift-boat float becomes the more practical way to cover water.

**Hatch Windows**

Field & Stream's aquatic-insect primer for trout anglers identifies stoneflies, mayflies, caddisflies, and midges as the four foundational hatches driving spring trout feeding. On Teton-area streams in early May, golden stonefly nymphs are typically active along the streambed, blue-winged olive (BWO) dries tend to fire in the cooler afternoon light, and midges cluster at dawn and dusk on slower pools. With the full moon peaking May 3, low-light windows will likely produce the most consistent surface activity over the next two to three days — target 6:00–9:00 AM and 5:00–8:00 PM for the best shots at rising cutthroat.

**Weekend Planning**

If flows hold below 3,500 cfs through the weekend, Saturday and Sunday mornings are the priority sessions. Arrive by 6:30 AM, rig a two-fly nymph setup for the first hour, then transition to dries as the BWO hatch fires mid-morning. Watch water visibility closely — heavily silted flows after a warm overnight can push fish into clearer back channels and side tributaries. The broader Yellowstone drainage should mirror similar flow and temperature conditions this weekend. Check current regulations carefully for any Yellowstone-interior sections, as opening dates and special rules typically differ from the Snake River corridor through Grand Teton National Park.

Context

Early May sits in the classic transition zone for Wyoming's two marquee freshwater drainages. The Yellowstone and Snake systems typically emerge from ice-out by late April at lower elevations, entering a brief but productive prime window before June snowmelt surges make most wading impractical. A water temperature of 50°F is solidly on-schedule — neither early nor late — for this corridor in the first week of May.

The 2,880 cfs reading at Moran (USGS 06192500) represents moderate pre-runoff flow. The gauge historically peaks between 8,000 and 15,000 cfs in late May to early June, meaning the current reading sits at roughly 20–35% of the annual high. Anglers who know this window call it "the sprint" — a two-to-four-week stretch when flows are manageable, water temperatures are ideal for active feeding, and hatches are ramping up fast.

None of the angler-intel feeds this week carried Wyoming- or Teton-specific reports, so direct year-over-year comparisons are unavailable. What is available: Field & Stream's current editorial on aquatic insects underscores that the stonefly-mayfly-caddis-midge sequence is a consistent spring constant in Rocky Mountain trout fisheries — and at 50°F, all four hatches are either active or imminent on the Snake and Yellowstone drainages.

The full moon on May 3 is a recurring seasonal factor rather than an anomaly. In most years the spring full moon coincides with intensifying stonefly activity on Teton-area streams, and experienced Yellowstone fly anglers often time their first serious dry-fly outing of the season to this lunar window. By that measure, 2026 appears to be running on schedule.