Mr. Black,
The area is just off of I-24. It has built up over the years. Nothing is preserved. Your ancestor was likely bivouacking there in the fall of 1863 prior to the unit's movement into Chattanooga.
I hope this helps.
Respectfully,
Gerald D. Hodge, Jr.
War Between the States Historian
Historian: 39th Georgia Volunteer Infantry Regiment
http://39thgavolinfrgt.homestead.com/39thHomepage.html