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Fly Fishing Nymph

Oregon: Middle Fork Willamette River Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Blue Winged Olive16 - 22        
Little Black Stonefly16 - 20           
Brown Stonefly8 - 12          
March Brown10 - 16         
Caddis (various)8 - 18      
Golden Stonefly8 - 12          
Green Caddis8 - 10           
Salmon Fly4- 8         
Little Yellow Stonefly14 - 18          
Pale Evening Dun16 - 20          
Pale Morning Dun16 - 20          
Yellow Drake12 - 14           
Mahogany Dun16 - 20           
October Caddis4 - 8          
Click Fly Name to see patterns that imitate it.