Welcome, John. I share a similar background having worked in Kingsport until my mid 50s. It was only a year or two before I started fly fishing. We then moved to Nashville where my wife is from. One of the places we lived was just off Nolensville Rd in an area locals refer to as "Brentioch." (heard that one, Harry?). We moved back to East TN after about seven years. My wife much preferred the mountains and I was able to get got part-time work in Kingsport.
If you haven't already done so, visit the folks at Cumberland Transit
at 2807 West End Ave. About four years ago I got to meet Allen Doty, owner, and two really great gents in the FF section: Leo DeMonbreum and Ronnie Howard. If they are still working there, tell them the Map Guy said "Hi."
I only got to fly fish Caney Fork and had planned to do the Harpeth. Maybe I can fish it vicariously through you.
All the best,