Here’s another photo which looks like it could have been taken from somewhere around McMahon’s Lookout at the end of Tablelands Road. By the look of the shadows and the line of the valley, the camera is pointing somewhere close to south. Is it possible that the road down from McMahon’s into the Burragorang Valley was ever this good?
EDIT UPDATE: After looking further at the old map (link in my post above) this must be the road from Oakdale down to Central Burragorang. I will keep looking for info on the road from McMahons Lookout down into the valley. I am intrigued as to what reasons a transport link was used between Wentworth Falls and the Burragorang/Wollondilly region.