@Burrakucat - I’m just not sure exactly what happens around the bridge, although I’m seeing what you’re seeing. On the higher ground further up the hill, further to the south than the bridge, the cable can be seen lying on the rocks on the east side of the road and it is visible on the east side all the way to me and down into Heasta itself for at least some of the way.
At the Heasta cattle grid if memory serves the cable should be visible going over the stream immediately south of the Heasta fank. South of the Heasta cattle grid, ie right by my house, the cable is east of the road and west of the stream (Allt an Daraich - trans ‘stream of the oak’; traditionally an ‘allt’ was supposed to be required to have two steep sides, or so I was told. This does qualify as such, where it goes over two impressive waterfalls, one by my house and one below it. In some places you see a ‘leth-allt’ ([ˈʎe(h) aʊɫ̪t̪]), which has one steep side.)