What flies are hatching on the Gallatin River right now?

Current and seasonal hatches on the Gallatin River include Salmonfly, Golden Stone, Caddis. Use the AI Hatch Advisor on this page for a live, temperature-aware recommendation.

What's the current flow on the Gallatin River?

The Gallatin River is running at currently unavailable — check the USGS gauge at At Gallatin Gateway for the latest reading. Readings update every 15 minutes from the USGS Water Services API.

Is the Gallatin River fishable today?

Live conditions for Gallatin River are unavailable right now. Check the embedded gauge widget on this page for the latest data.

Gallatin River Fly Fishing Conditions

Live Conditions

Gallatin River — At Gallatin Gateway

No Data

—CFS

Discharge

—ft

Gauge Height

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Water Temp

No recent dataView on USGS ↗

7-Day Flow

↓ Falling

RisingFallingStable

24-Hr Pressure

25.47 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

51°FClear sky

Wind 4 mph25.47 inHg Low & stable

Tough conditions — fish deep

Today

☁️

Overcast

68° / 48°

Tomorrow

☀️

Clear sky

74° / 45°

Wed

☀️

Clear sky

89° / 50°

Thu

☀️

Clear sky

95° / 53°

Cold front incoming — go deep with nymphs, surface activity likely slow.

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.

Time of Day

Using: PMDs continue. Hopper season peak

What should I pack?

Rod, flies, tippet, and safety gear specific to today's Gallatin River conditions.

🪰 Hatch Calendar

Gallatin River · August · Late Summer

Full calendar →

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

Select month

JanDec

PMDs continue. Hopper season peak (size 8-12). Caddis evenings. Hot afternoons — fish early in the canyon. Cool mountain water stays productive longer than valley rivers.

PMDCaddis

River Map

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

About Gallatin River

Wade-only freestone flowing from Yellowstone Park through Big Sky to Three Forks (joining the Madison and Jefferson). Roadside pocket water along Highway 191 — accessible, scenic, and full of wild rainbows and browns.

SalmonflyGolden StoneCaddisPale Morning DunHopperBlue-Winged OliveMidge

Regulations

Wade-only — no float fishing on the Gallatin. Standard Montana fishing license required.

Learn More

Guides to help you fish Gallatin River with more confidence.