What flies are hatching on the Big Wood River right now?

Current and seasonal hatches on the Big Wood River include Pale Morning Dun, Caddis, Blue-Winged Olive. Use the AI Hatch Advisor on this page for a live, temperature-aware recommendation.

What's the current flow on the Big Wood River?

The Big Wood River is running at 118 CFS at the Near Ketchum gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Big Wood River fishable today?

Big Wood River is rated marginal right now. Flow is 118 CFS at the Near Ketchum gauge. Go in prepared — heavier tippet, cautious wading, or target edges and seams.

Big Wood River Fly Fishing Conditions

Live Conditions

Big Wood River — Near Ketchum

Marginal

118CFS

Discharge

1.45ft

Gauge Height

57.2°F

Water Temp

Updated 56 min agoView on USGS ↗

7-Day Flow

→ Stable

RisingFallingStable

24-Hr Pressure

24.68 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

56°FMainly clear

Wind 7 mph24.68 inHg Low & stable

Tough conditions — fish deep

Today

☁️

Overcast

77° / 45°

Tomorrow

🌧️

Rain

75° / 54°

0.19"

Fri

☁️

Overcast

69° / 52°

Sat

🌧️

Rain

66° / 47°

0.14"

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.

7.6

Time of Day

Using: 118 CFS · 57.2°F · BWOs returning

What should I pack?

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

🪰 Hatch Calendar

Big Wood River · September · Early Fall

Full calendar →

🟢 Active now at 57.2°F water

Pale Morning DunCaddisBlue-Winged Olive

🟡 Approaching — within 5°F of trigger range

Trico

Select month

JanDec

BWOs returning (size 18-20). Hoppers still effective. Cooling water, active fish. Fall colors in Sun Valley spectacular. Best dry fly month for selective sight-fishing.

Blue-Winged Olive

🟢 Active · 🟡 Approaching · ⚪ Seasonal only

River Map

Loading map…

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

About Big Wood River

Freestone river flowing through Ketchum and Sun Valley with classic pocket water and accessible public stretches. Wild rainbows and browns plus the occasional brookie in tributary water.

Pale Morning DunCaddisBlue-Winged OliveHopperTrico

Regulations

Catch-and-release only for trout in the Sun Valley/Ketchum area (Magic Dam to Stanton Crossing), with artificial flies and lures only in designated sections. Idaho fishing license required. Verify current regs at idfg.idaho.gov before fishing.

Learn More

Guides to help you fish Big Wood River with more confidence.