I don't know that there are any overlay maps of roads as such, however, the Rockbridge Historical Society has a copy of an 1880 engineering map which you can purchase from them and a couple of other years of maps and there are more maps in the Special Collections at Leyburn Library which you can compare. The 1880 engineering map has the names of households and where they are located on the roads. I believe the engineering maps may have been done every 10 or 20 years. Leyburn Library Special Collections at W&L is probably where to look. However, you'll have to check and see about hours as graduation is tomorrow and they will have summer hours. Patte Wood