Several posts were deleted from this thread. Adding valuable info and insights in a stream report is both welcomed and encouraged. But posting nonsense and moving the thread off track is not welcomed. Please use the "Off the Water" forum for comments not related to the subject.
As far as Valley, there are and have been some BWO hatches this fall. Also, midges are present and may hatch pretty much 365 days a year.
A Griffith's gnat works as a midge imitation. I prefer a thread body midge with a wisp of CDC for the wing in a size 24 or even smaller.
Small, size 20 BWO's can be effective. I use parachute ties or CDC emerger ties most often.
For subsurface, black zebra midges work along with small Pheasant Tails and Hares Ear nymphs.
The water is really low right now, but a decent amount of rain is expected by midweek. Hopefully it will materialize and help end this dry spell.
If the water rises and clouds up, stripping streamers often works well and may even allow you to catch some of the bigger fish in Valley.
The "secret" to catching fish in Valley is not any fly pattern, it's more about not spooking the fish as well as getting a good drift when fishing dries or nymphs.
Good luck.