Oregon Freestone
Williamson River Fishing Report, Flows and Hatches
The big, slow, spring-fed lower Williamson below the Sprague confluence, famous for lake-run trophy redband rainbows. The after-dark Hexagenia hatch is the event of the year, and outside it the redbands mostly feed subsurface on leeches, sculpins, and nymphs.
Freestone
Oregon
4,150 ft
Gauge 11502500
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
Williamson River hatch chart
The emergences that come off the Williamson by month, straight from the Rivus hatch model.
| Hatch | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Midge Midge, #16-20 | ||||||||||||
Blue Winged Olive Mayfly, #16-18 | ||||||||||||
Pale Morning Dun Mayfly, #16-18 | ||||||||||||
Caddisfly Caddis, #16-18 | ||||||||||||
Callibaetis Mayfly, #16-18 | ||||||||||||
Golden Stonefly Stonefly, #6-10 | ||||||||||||
Hexagenia Mayfly, #4-8 | ||||||||||||
Green Drake Mayfly, #10-12 | ||||||||||||
Little Yellow Sally Stonefly, #14-16 | ||||||||||||
Trico Mayfly, #20-24 | ||||||||||||
Grasshopper / Terrestrial Hopper, #8-12 | ||||||||||||
Flying Ant / Carpenter Ant Ant, #14-16 | ||||||||||||
October Caddis Caddis, #6-8 | ||||||||||||
Mahogany Dun Mayfly, #14-16 |
How it fishes
A Oregon 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 Williamson is metered at USGS gauge 11502500. 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.