I've fished private water on the Big Lost River just outside of Mackay, Idaho with the Mackay Special, a cranefly imitation originated on the Big Lost. It was a a dynamite fly. I had to go back and buy more flies for the next day.
It requires horse hair and the Potts weave.
Another great pattern is the Bruns Tipula, tipuladae being the family of the cranefly.
Brun's Polychenille Tipula
Crane Fly2 - North Eastern Fly Fishing's Online Photo Gallery