Hi all,
I'm new to WS and am still catching up but have been really impressed by everyone's insights and analyses!
Anyway, I've been doing some genealogy searching and was able to find his grandfather's name but I'm not going to post it (against forum rules). However, it appears that he was buried in what was formerly called the Carr Family Cemetery, which (I think) is now part of the Ivy Creek Natural Area in Charlottesville. If you look it up, you can see that that area is just over a mile away from Albemarle High School (where I believe JM attended high school prior to transferring to Monticello... does anyone else remember reading this somewhere?).
Ivy Creek Natural Area is not only right by Ivy Creek, but also the South Fork of the Rivanna River.
FWIW, here are some other nearby cemeteries that appear to be associated with the family:
Rose Hill Cemetery
Oakwood Cemetery
Chapman Grove Baptist Church Cemetery
IMO/MOO