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Colorado River Hatch Chart

Colorado River Mayfly Hatch Chart
Common Name
Genus/Species
April May June July Aug. Sept. Oct. Nov.
"Trico" Spinner
Tricorythodes minutus
         
Blue-Winged Olive
Baetis
     
Pale Evening Dun
Epeorus albertae
             
Green Drake
Ephemerella grandis
           
Pale Morning Dun
Ephemerella inermis
         
Mahogany Dun
Leptophlebia gravestella
           
Tiny Olive Quill
Psuedocloeon futile
       
Quill Gordon
Rhithrogena morrisoni
           
Red Quill
Rhithrogena hageni
             


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