HATCH CHART

Common NameLatin Name GroupEmergence Dates*Emergence Times
Tiny Black Stonefly #16-20Allocapnia granulata, NemouridaeStonefly1/1-4/30noon-4pm
Early Black Stonefly #10-14Taeniopteryx nivalisStonefly2/21-4/30noon-4pm
Early Brown Stonefly #12, 14Brachyptera fasciataStonefly3/15-5/101pm-7pm
Slate Wing Mahogony #16-18 (Little Red Quill)Paraleptophlebia adoptivaMayfly4/15-7/8 Peak: 5/1-1410am-4pm
Blue-winged Olive #16-20Baetis vagansMayfly4/15-8/24 Peak: 5/1-7 and 6/7-21noon-3pm
Dark Hendrickson #12, 14 (Hendrickson, Red Quill)Ephemerella subvaria Mayfly4/20-5/20 Peak: 5/1-1410am-4pm
Little Black Caddis #16-18Chimarra aterrimaCaddisfly4/20-7/31 Peak: 5/1-14noon-10pm
Grannom Caddis #14-16Brachycentrus americanusCaddisfly4/20-7/312pm-dark
Borcher's Drake #12, 14Leptophlebia cupidaMayfly4/20-8/1510am-4pm
Green Caddis #10-18 (Green Rock Worm)Rhyacophilidae fenestraCaddisfly5/1-6/302pm-dark
Medium Bown Stonefly #8-14Perlodidae lsogenusStonefly5/1-7/31afternoons
Light Hendrickson #14, 16Ephemerella rotundaMayfly5/3-6/20noon-5pm
Giant Stonefly #2-8 (Salmonfly)Pteronarcys dorsataStonefly5/15-6/30any time
Great Speckled Olive Mayfly #10-14Siphloplecton basaleMayfly5/15-7/15 Peak: 5/14-31noon-5pm
True Hendrickson #14, 16Ephemerella invariaMayfly5/15-7/20 Peak: 5/21-6/7noon-5pm
Sulphur Dun Mayfly #16, 18Ephemerella dorotheaMayfly5/15-7/8 Peak: 6/7-30noon-5pm
Blue-winged Olive #14, 16Baetis spp.Mayfly5/15-7/128pm-10pm
Tiny Blue-winged Olive #20, 22Baetis cingulatusMayfly5/15-8/3010am-9pm
Green Oak Worm #8-12Lepidoptera sp.Terrestrial5/15-7/10 Peak: 6/7-21day
Little Yellow or Green Stonefly #14-18Allloperla sp.Stonefly5/15-10/30afternoons
White Miller Caddis #14, 16NectopsycheCaddis5/15-10/30afternoons