Chris, I was there again yesterday as well. I left about the time you started fishing. I fished the same section you fished and I had one of my better days. I hooked over a dozen fish on different nymph patterns.
When I started fishing around 1PM, I saw splashy rises right away. I figured out there were caddis and sulfurs hatching. It's nice to see some insects hatching on that stream that are not tiny.
When I spotted the sulfurs, I fished a #16 jig nymph under a thingamabobber. After putting that fly on, I proceeded to hook 4 nice browns in one deep riffle that had a log running along it. The first one I hooked would have been my best ever Valley Brown, but it got off before I could net it. It was probably close to 12". I think that the cool cloudy weather helped with the insect activity. This was the first time I ever saw sulfurs hatching on Valley Creek.