That stretch of the platte is fished so much that sometimes the fish just dont hit anything. I think sometimes you are better off fishing flies that the fish havent seen a million of. Instead of fishing an RS2 like everyone else try some scuds, pheasant tails,hares ears, something the fish havent seen in a while. My all time favorite fly for this stretch is a black beauty, you can catch fish all year there on this fly.
The above advice is very good. You can also use an orange scud in place of an egg pattern. I use a three fly rig there alot. I will always use and atractor paattern first such as an egg, scud or a red brassie. The second fly will be something like a merical nymph or rs2 with the tails and tuff cut off. Third will be something like a blck beauty or wd40. BH breadcrust can be killer there also. Everything I know in a nutshell.