This is the hatch chart for the Letort river in southern Pennsylvania.
| Common Name | Dates of Emergence |
| Blue-Winged Olive | April 1 - May 10 |
| Pale Evening Dun | May 1 - June 10 |
| Trico | July 1 - Oct. 31 |
| Blue-Winged Olive | Sep 20 - Oct. 31 |
| Terrestrials | July 1 - Sep 30 |
| Scuds, Cressbugs | Jan. 1 - Dec. 31 |
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