Sizes of willow flies
They are actually a mayfly that originally are #16 upstream of Watts Bar, but due to the mitogens from below Oak Ridge.........
Actually, those flies are found throughout the south in lakes with silt bottoms. You have to look for them where the bottoms did not dry up or draw down during the winter months.
Those hatches are indeed impressive.
I am a great admirer of spectator sports, especially on television; it keeps the riffraff off the trout streams.