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 365 CFS at the At Gallatin Gateway gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Gallatin River fishable today?

Yes — Gallatin River is rated fishable right now. Current flow is 365 CFS at the At Gallatin Gateway gauge.

Gallatin River Fly Fishing Conditions

Live Conditions

Gallatin River — At Gallatin Gateway

Fishable

365CFS

Discharge

1.40ft

Gauge Height

—

Water Temp

Updated 38 min agoView on USGS ↗

7-Day Flow

→ Stable

RisingFallingStable

24-Hr Pressure

25.35 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

55°FOvercast

Wind 7 mph25.35 inHg Low & stable

Tough conditions — fish deep

Today

☁️

Overcast

68° / 40°

Tomorrow

☁️

Overcast

71° / 46°

Fri

🌦️

Drizzle

73° / 50°

0.04"

Sat

🌧️

Rain

59° / 53°

0.69"

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.

9

Time of Day

Using: 365 CFS · Hopper season continuing. BWOs returning

What should I pack?

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

🪰 Hatch Calendar

Gallatin River · September · Early Fall

Full calendar →

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

Select month

JanDec

Hopper season continuing. BWOs returning (size 18-20). Cooling water, active fish. Fall colors through Gallatin Canyon spectacular. Best dry fly month after summer crowds thin.

Blue-Winged Olive

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.