Where are you fishing James? Usually Dollies aren't that challenging to catch. I suspect they were just "off the bite". They can get full pretty easily.
How many different times did you try? Not casts but visits to the creek. I suggest trying at first light after they have spent the night in the dark not feeding so much.
If you can see the fish, you can see what they are doing. Are they eating anything? If not, there's your answer. If they are eating, find something to match that.
Egg patterns work well, on or near the bottom. Look at the eggs you see in the water and fish egg patterns that match those eggs. If the the eggs in the water are white (from being washed out) and you are fishing a different size and a different color, it could make a difference when they are full. They get really finicky.
Flesh patterns work well too, this late in the season when salmon are starting to fall apart.