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Colorado River Hatch Chart

Colorado River Mayfly Hatch Chart
Common Name
April May June July Aug. Sept. Oct. Nov.
"Trico" Spinner
Tricorythodes minutus
Blue-Winged Olive
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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