HATCH CHART
Common Name Latin Name Group Emergence Dates* Emergence Times
Tiny Black Stonefly #16-20 Allocapnia granulata, Nemouridae Stonefly 1/1-4/30 noon-4pm
Early Black Stonefly #10-14 Taeniopteryx nivalis Stonefly 2/21-4/30 noon-4pm
Early Brown Stonefly #12, 14 Brachyptera fasciata Stonefly 3/15-5/10 1pm-7pm
Slate Wing Mahogony #16-18 (Little Red Quill) Paraleptophlebia adoptiva Mayfly 4/15-7/8 Peak: 5/1-14 10am-4pm
Blue-winged Olive #16-20 Baetis vagans Mayfly 4/15-8/24 Peak: 5/1-7 and 6/7-21 noon-3pm
Dark Hendrickson #12, 14 (Hendrickson, Red Quill) Ephemerella subvaria Mayfly 4/20-5/20 Peak: 5/1-14 10am-4pm
Little Black Caddis #16-18 Chimarra aterrima Caddisfly 4/20-7/31 Peak: 5/1-14 noon-10pm
Grannom Caddis #14-16 Brachycentrus americanus Caddisfly 4/20-7/31 2pm-dark
Borcher's Drake #12, 14 Leptophlebia cupida Mayfly 4/20-8/15 10am-4pm
Green Caddis #10-18 (Green Rock Worm) Rhyacophilidae fenestra Caddisfly 5/1-6/30 2pm-dark
Medium Bown Stonefly #8-14 Perlodidae lsogenus Stonefly 5/1-7/31 afternoons
Light Hendrickson #14, 16 Ephemerella rotunda Mayfly 5/3-6/20 noon-5pm
Giant Stonefly #2-8 (Salmonfly) Pteronarcys dorsata Stonefly 5/15-6/30 any time
Great Speckled Olive Mayfly #10-14 Siphloplecton basale Mayfly 5/15-7/15 Peak: 5/14-31 noon-5pm
True Hendrickson #14, 16 Ephemerella invaria Mayfly 5/15-7/20 Peak: 5/21-6/7 noon-5pm
Sulphur Dun Mayfly #16, 18 Ephemerella dorothea Mayfly 5/15-7/8 Peak: 6/7-30 noon-5pm
Blue-winged Olive #14, 16 Baetis spp. Mayfly 5/15-7/12 8pm-10pm
Tiny Blue-winged Olive #20, 22 Baetis cingulatus Mayfly 5/15-8/30 10am-9pm
Green Oak Worm #8-12 Lepidoptera sp. Terrestrial 5/15-7/10 Peak: 6/7-21 day
Little Yellow or Green Stonefly #14-18 Allloperla sp. Stonefly 5/15-10/30 afternoons
White Miller Caddis #14, 16 Nectopsyche Caddis 5/15-10/30 afternoons
