Dun Scolpaig has become quite famous as the tower built on top of the dun is the picture in Ordnance Survey 18. They had a far sunnier day than us.
We didn't attempt to cross as the causeway seems to be falling apart, besides that the area near it thad been flooded the previous day and it was still decidedly very wet underfoot.
The tower which was erected in 1830 appears to have been built from the stones of the dun.
Follow the A865 from the Clettraval road north and pull in just after the Cross (on the OS map). A minor road indicated is in a ruinous condition and the farm at the end of the road in a similar state.