The adults live up to seven days and only fly at night. Most of a fishfly's life (2-5 years) is as a voracious predatory larvae in freshwater. Apparently they like fast flowing streams, however there are few of those near Leaning Oaks and I am not sure how far the adults will fly. My brief observations would indicate that long distance flight would be a challenge!
Thanks to Dr. Rob Cannings (@DrCannings) for ID help. You rock!