We had a family vacation up at Fort Robinson in the northwest corner of the state two weeks ago and I did pretty well on the trout. I wasn't planning on fishing that much, but things came together and I was able to complete 3/4 of the Nebraska Trout Slam. You need a brown, rainbow, cutthroat, and brook. The only one I didn't catch was a brook, but I did catch plenty of tiger trout to get four species in one trip which was neat. My dad taught me to fly fish while we were there also, but didn't have any luck using flies. I caught everything on Panther Martins. The creeks and rivers were pretty well grown over so it took some stealth and skill to cast where you wanted. I think early spring before regrowth would be the ticket on a fly rod up there.