Insects and other foods the trout may be eating:
1.   Blue-winged Olives - mostly Little BWO - Isolated hatches
2.   Giant Black Stoneflies - starting any day, nymphs active
3.   Cinnamon Caddis - Mostly Abrams Creek
4    Light Cahills - hatching
5.   Midges - hatching in isolated locations
6.   Little Short-horned Sedges - should hatch randomly for 2-3 months
7.   American March Browns - hatching but randomly in isolated locations
8.   Streamers - matching sculpin, baitfish and small crawfish
9.   Little Yellow Stoneflies - hatching
10. Eastern Green Drakes - should be starting in Abrams Creek
11. Green Sedges - hatching
12. Little Sister Caddisflies - Mostly Abrams Creek
13. Eastern Pale Evening Duns - starting any day (called Sulfurs by some)

Little Yellow Stoneflies (Yellow Sally) - Adults

There is no sure way, short of going to a lot of trouble, to determine when the
different species of the Little Yellow Stoneflies will deposit their eggs. They deposit
them at different times of the day depending on the species. It also depends on the  
weather at the time of year they hatch. Many species deposit their eggs during the
evenings. Most of the Summer Stoneflies (Peltoperlidae family) deposit their eggs
during the evenings. The
isoperia species, or true Yellow Sallies, usually start
depositing their eggs in the afternoons prior to dark. That is one reason they are
popular. You can get a lot of action on the dry fly.

You should actually observe stoneflies depositing their eggs before you spend time
imitating the process. They are large enough that you can easily see them dropping
down to the surface, usually bouncing along on the surface, dropping their eggs.
Sometimes they will lite on the surface for a short time but for the most part, they
knock their eggs off by touching the surface.

They will deposit their eggs in the riffles and runs. There are a few species that will
do so at the heads of pools where faster water runs into the pool and at the tail
ends of pools where the current picks up. Where ever you see them depositing
their eggs is where you should fish imitations of the adult. I have caught as many
trout imitating the egg laying Yellow Sallies as I have caught in a short time span
imitating any insect in the Great Smoky Mountains National Park. It can provide
terrific surface action. It usually only last a short time but sometimes you can catch
a fish on about every cast.

Our "Perfect Fly" Little Yellow Stonefly Adult