Looking for some places to wade fish for smallmouth on the Susquehanna…spinning or flyfishing

Not sure why the moderator moved your post to the Southeast region.  Since the Susquehanna is in PA.  I haven't fished the Susquehanna in years so I can't really give you any help.   Repost in the Northeast Bass Fishing.  That should get you some replies.

What stretch are you looking at?

I’ve always waded below the Rockville bridge 

Going to have be a bit more specific. Susquehanna is a big river.

There is a small park on the Marysville side that has good wading access. Just be careful as there are some huge rocks.  You think you are walking on the bottom and you step off what turns out to huge rock.