What flies are hatching on the Ruby River right now?

Current and seasonal hatches on the Ruby 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 Ruby River?

The Ruby River is running at 499 CFS at the Near Twin Bridges gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Ruby River fishable today?

Yes — Ruby River is rated fishable right now. Current flow is 499 CFS at the Near Twin Bridges gauge.

Ruby River Fly Fishing Conditions

Live Conditions

Ruby River — Near Twin Bridges

Fishable

499CFS

Discharge

1.72ft

Gauge Height

—

Water Temp

Updated 55 min agoView on USGS ↗

7-Day Flow

↑ Rising

RisingFallingStable

24-Hr Pressure

23.71 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

51°FClear sky

Wind 9 mph23.71 inHg Low & stable

Tough conditions — fish deep

Today

🌫️

Foggy

65° / 48°

Tomorrow

☀️

Clear sky

68° / 45°

Wed

☀️

Clear sky

79° / 52°

Thu

☀️

Clear sky

87° / 56°

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: 499 CFS · PMDs continue. Tricos

What should I pack?

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

🪰 Hatch Calendar

Ruby River · August · Late Summer

Full calendar →

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

Select month

JanDec

PMDs continue. Tricos (size 22-24) at peak — early-morning spinner falls. Hopper season peak (size 8-12) along grassy meadow banks. Brown trout selective and pressured — small flies, fine tippet.

PMDTrico

River Map

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

About Ruby River

Small meadow tailwater below Ruby Reservoir flowing north to the Beaverhead at Twin Bridges. Technical brown trout fishing in low, clear water — public access has been a long-running issue, so know the bridge-access rules before you go.

CaddisPale Morning DunHopperBlue-Winged OliveTricoMidge

Regulations

Public access on the Ruby is contentious — Montana stream access law allows fishing below the high-water mark, but landowner conflicts at bridge crossings are ongoing. Use established FWP fishing access sites and stay below the high-water mark.

Learn More

Guides to help you fish Ruby River with more confidence.