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Fly Fishing Nymph

Washington: Yakima River Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Midges (various)16 - 24 
Streamers (various)2 - 8 
Blue Winged Olive16 - 20          
Golden Stonefly4 - 12            
March Brown12 - 16            
Caddis (various)12 - 20       
Pale Morning Dun16 - 18            
Salmon Fly2 - 4            
Brown Drake10 - 12           
Green Drake10 - 12           
Yellow Sallie14 - 16            
Terrestrials (various)2 - 16           
October Caddis4 - 6            
Click Fly Name to see patterns that imitate it.