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Fly Fishing Nymph

Pennsylvania: Clarks Creek Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Little Black Stonefly12 - 16           
Blue Quill16 - 18            
Blue Winged Olive18 - 20            
Tan Caddis14 - 16        
Hendrickson12 - 14             
Red Quill12 - 14             
March Brown12             
Gray Fox12 - 14            
Light Cahill14 - 16             
Slate Drake12 - 14             
Sulphur16 - 18             
Terrestrials (various)18 - 20         
Yellow Sallie14 - 16            
Little Green Stonefly16 - 18             
Light Cahill16 - 18             
Click Fly Name to see patterns that imitate it.