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