Welcome!
You have the right idea. The timber in Buck is usually productive. Along/near the channel, depending as it's deeper near the ramp/bridges and you are yaking. 6-15 fow is always a good start (structure and/or cover/timber). Never hurts to scan the pilings for suspended fish or back off from the riprap either if you have the time. I don't know if the Buck ramp is open, but you can park and walk in if you have a cart if it's not. Or put in at the creek and work back.
The area on the dam side of the Isle park holds em in the spring. Same for a few of the little coves on the far south bank that runs from the this area over to the dam. One or more of the COE piles in there could easily still have some fish on it. You can put in from one of the few parking lots southeast of the lot with the pier and save some time if you're going to this area. The ramp area with the pier has some fish too. I've caught em on the rocks and banks around there shallow so I know there's some hanging out a little deeper. You're definitely going to have to put in time to cover this area in a yak. Johnson Branch should be a good yak place.
Whichever, find an area you think is a spawning area and fish out from there. 6-15 fow is good. Try shallow like 3 ft if you like it.
There are a couple recent threads where Kenny C was asking about Buck. Check those out. SK's been making some videos that might help you too.