What flies are hatching on the South Fork Snake River right now?

Current and seasonal hatches on the South Fork Snake River include Salmonfly, Golden Stone, Pale Morning Dun. Use the AI Hatch Advisor on this page for a live, temperature-aware recommendation.

What's the current flow on the South Fork Snake River?

The South Fork Snake River is running at 5,450 CFS at the Below Palisades Dam gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the South Fork Snake River fishable today?

South Fork Snake River is outside its fishable window right now. Flow is 5,450 CFS at the Below Palisades Dam gauge. Check back when conditions return to the normal range.

South Fork Snake River Fly Fishing Conditions

Live Conditions

South Fork Snake River — Below Palisades Dam

Unfishable

5,450CFS

Discharge

3.51ft

Gauge Height

—

Water Temp

Updated 39 min agoView on USGS ↗

7-Day Flow

→ Stable

RisingFallingStable

24-Hr Pressure

24.99 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

54°FClear sky

Wind 15 mph24.99 inHg Low & stable

Tough conditions — fish deep

Today

🌧️

Rain

69° / 56°

0.09"

Tomorrow

🌧️

Rain

69° / 51°

0.34"

Sat

🌦️

Drizzle

61° / 49°

0.04"

Sun

☁️

Overcast

68° / 51°

Rain in forecast — expect rising, off-color water in 12–24 hrs.

Weather by Open-Meteo · No API key · Updated every 30 min

What should I fish today?

⚡ AI

AI-powered recommendation using today's live flow, temperature, and hatch data.

2

Time of Day

Using: 5,450 CFS · HOPPER SEASON PEAK

What should I pack?

Rod, flies, tippet, and safety gear specific to today's South Fork Snake River conditions.

🪰 Hatch Calendar

South Fork Snake River · September · Early Fall

Full calendar →

Showing typical dates — water temperature data unavailable for live hatch predictions.

Select month

JanDec

HOPPER SEASON PEAK (size 8-12) — September is THE month on the South Fork. BWOs returning (size 18-20). Mahogany Duns (size 16-18) late month. Streamer fishing kicks in for pre-spawn browns.

Blue-Winged OliveStreamer

River Map

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USGS Gauge (click for site ID)Fishing Access / SectionScroll to zoom disabled — use map controls

About South Fork Snake River

Iconic big-water tailwater below Palisades Reservoir flowing through Swan Valley. Native Yellowstone Cutthroat share the river with rainbows and trophy browns — best known for the Salmonfly hatch, summer Caddis and PMDs, and a legendary hopper season.

SalmonflyGolden StonePale Morning DunCaddisHopperBlue-Winged Olive

Regulations

Catch-and-release only for cutthroat trout in the upper canyon section — one of the best dry fly rivers in Idaho. Idaho fishing license required. Verify current regs at idfg.idaho.gov before fishing.

Learn More

Guides to help you fish South Fork Snake River with more confidence.