American grannoms hatch all over the country. Specifically the little black caddis, hatch throughout all the midwest and eastern trout streams. Usually the best place to find them in abundance is throughout most tailwaters. A good imitation would be something in a size 16 or 18. They start showing up in early to mid April, and can be found usually deep into June. Hatches seem to come of in the mid to late mornings as the day starts to heat up and go right into the afternoon hours. These hatches often produce sporadic very aggressive feeding, trout literally boiling the water, while you'll hardly ever see an insect leaving the water. These hatches can be very fun to fish, but it is critical to match the emergence very closely.
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