I was up there last weekend with 2 buddies. One of them did well, catching 2 fish in about 6 hours.
Both were taken on an Olive Willy like pattern: basically a carey special with a red bead head, olive tail, olive chenille and olive pheasant rump hackle. there is a little tuft of red feather fluff on top of the hackle at the top of the fly.
My other buddy and I fished just about everything else and struck out without a take.
We also heard from others that were saying the best time is after dark. One guy claimed a 27" brown near the parking lot one evening right after dark. For that fishery, I hear that it needs to be big and black. Bunny leeches and the like.