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Fly Fishing Nymph

Michigan: Au Sable River Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Blue Quill18            
Blue Winged Olive18 - 20             
Caddis (various)14 - 18         
Hendrickson12 - 14             
Red Quill12 - 14             
March Brown10 - 12             
Sulphur16 - 18            
Brown Drake8 - 10             
Gray Drake12 - 14             
Stoneflies (various)6 - 12            
Blue Winged Olive14 - 22         
Isonychia10 - 12           
Light Cahill14            
Yellow Sallie12 - 16             
Terrestrials (various)6 - 18            
Trico22 - 24            
White Fly12 - 14            
Click Fly Name to see patterns that imitate it.