Yes, I am a mapmaker, but there are numerous hollows along that river between what I perceive as "Williamsville" in east-central Shannon County and Mill Springs in north-central Carter County. What you call "Williamsville" I gather is Williams Mountain and Clint Williams' Spring in east central Shannon County. These two points, if these are the same ones you have in mind, are about ten miles apart in straight-line distance. As I said, there are numerous hollows on the east side of the river between them.

Bruce