What flies are hatching on the Sun River right now?

Current and seasonal hatches on the Sun River include Caddis, Pale Morning Dun, Hopper. Use the AI Hatch Advisor on this page for a live, temperature-aware recommendation.

What's the current flow on the Sun River?

The Sun River is running at 4,500 CFS at the Near Vaughn gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Sun River fishable today?

Sun River is outside its fishable window right now. Flow is 4,500 CFS at the Near Vaughn gauge. Check back when conditions return to the normal range.

Sun River Fly Fishing Conditions

Live Conditions

Sun River — Near Vaughn

Unfishable

4,500CFS

Discharge

1.90ft

Gauge Height

—

Water Temp

Updated 1 hr agoView on USGS ↗

7-Day Flow

↓ Falling

RisingFallingStable

24-Hr Pressure

26.44 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

65°FMainly clear

Wind 7 mph26.44 inHg Low & stable

Tough conditions — fish deep

Today

☀️

Clear sky

81° / 61°

Tomorrow

☁️

Overcast

67° / 49°

Tue

☁️

Overcast

75° / 47°

Wed

🌤️

Partly cloudy

89° / 51°

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.

2

Time of Day

Using: 4,500 CFS · PMDs continue. Hopper season peak

What should I pack?

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

🪰 Hatch Calendar

Sun 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) — Sun River grasshopper populations large in the agricultural valley. Caddis evenings. Cool mornings, hot afternoons.

PMDCaddis

River Map

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

About Sun River

High-plains tailwater below Gibson Dam flowing east from the Rocky Mountain Front through Augusta to Great Falls. Underrated brown and rainbow fishery in classic prairie-meets-mountains country with light angling pressure.

CaddisPale Morning DunHopperBlue-Winged OliveMidge

Regulations

Standard Montana trout regulations apply on the Sun; upper sections near the Bob Marshall Wilderness may carry special regulations. Montana fishing license required. Verify current regs at fwp.mt.gov before fishing.

Learn More

Guides to help you fish Sun River with more confidence.