TIMMYT I have been fishing Valley almost exclusively for four years now and here is my story and my advice. Let me start by saying that Valley Creek has alot of fish, but they wild and they are very smart. The patterns and tactics that work well on most stocked streams will not even get your fly a look at Valley. I was frustrated my first year fishing Valley as got skunked on several outings and still was only catching the occasional fish. I was actually convinced for a while that there weren't that many fish in there, but I now realize that they are there and you just have to be cautious to catch them.
The MOST IMPORTANT TIP I can give you is that Valley trout tend to spook easy to I usually walk up to the water slowly and then belly crawl or slowly move into a casting spot.
As for flies here are my top picks:
Fall/Winter selection: #10-12 Green and Black crystal wooly buggers, #16-18 Copper Johns, 16-18# Pheasant tails. 16-18# bead head caddis. Also some attractor patterns with flash will work.
Spring: #16-20 Blue Wing Olives, #16-18 little black stoneflies, #16-20 Elk Hair and CDC Caddis, #16-20 Brown mayfly patterns, #16-20 Parachute Adams. #18-20 Griffiths gnat.
THE MOST IMPORTANT PATTERN FOR LATE SPRING AND SUMMER IS THE STIMULATOR in all colors and sizes #14-16. It immitates hoppers, caddis, and small stoneflies well; the fish love them. I usually use them in rust, green or yellow.
Summer/Early Fall: Most important are the terrestrials. #14-18 Ant patterns, #14-18 foam bettles, Dave's Hoppers. Stimulators. #16-20 Elk hair CADDIS.