Idaho Freestone
Big Wood River Fishing Report, Flows and Hatches
A central Idaho freestone through the Ketchum and Sun Valley country, cool water with a strong PMD and caddis population. Green drakes and October caddis are the specialty hatches, and it fishes well from May into October.
Freestone
Idaho
5,300 ft
Gauge 13139510
Right now
Live conditions
An expert read, in your pocket
Rivus knows your river right now. Live conditions, what’s hatching, and what to tie on, the moment you open it.
When the day turns and nothing’s working, ask Eddy and change the plan.
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The hatch chart
Big Wood River hatch chart
The emergences that come off the Big Wood by month, straight from the Rivus hatch model.
| Hatch | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Midge Midge, #18-24 | ||||||||||||
Blue Winged Olive Mayfly, #16-22 | ||||||||||||
Caddisfly Caddis, #14-18 | ||||||||||||
Golden Stonefly Stonefly, #6-8 | ||||||||||||
Pale Morning Dun Mayfly, #14-18 | ||||||||||||
Green Drake Mayfly, #10-12 | ||||||||||||
Little Yellow Sally Stonefly, #14-16 | ||||||||||||
Pink Albert / Pink Lady Mayfly, #16-18 | ||||||||||||
Flying Ant / Carpenter Ant Ant, #14-18 | ||||||||||||
Grasshopper / Terrestrial Hopper, #6-12 | ||||||||||||
Trico Mayfly, #20-24 | ||||||||||||
October Caddis Caddis, #8-10 |
How it fishes
A Idaho freestone
A freestone river runs free off snowmelt and rain, so it swings hard with the seasons. It blows out and browns up in spring runoff, then drops and warms into summer. The hatches track the water temperature more than the calendar, so you time your trip to the flow and the thermometer.
Flow and gauge
Reading the flows
The Big Wood is metered at USGS gauge 13139510. Watch the trend as much as the number: a river that is dropping and clearing fishes very differently from one that is coming up.
Access and regulations
Before you fish
Access and the right to fish are the angler’s responsibility, every time. Public access, private water, and seasonal closures vary along the river, so confirm where you can legally stand and wade before you go. We do not point you to a specific spot.
Read the current rules, license requirements, and any special-regulation water before you go. Regulations change season to season, so check them fresh.
Flow and water temperature from USGS, weather from NWS and NOAA, refreshed hourly. Real-time USGS readings are provisional and subject to revision. The hatch chart and river read are Rivus model output.