No, you can't use bait in Gales Creek. If you read the regulations for the Willamette zone you will see that even for Pikeminnows and suckers, angling is restricted to artificial lures and flies in streams unless there are explicit exemptions. Gales creek does not have an exemption and thus it is illegal to use bait for any species at any time while fishing there.
I have found reading the regulations in the following fashion to be helpful. I first look at the body of water and see if there are special regulations then I go back and read the zone regulations. It usually produces a pretty straightforward explanation of what is and isn't allowed for any given body of water.