Shira Dam will get you some you tube versions? I've still not had time to look for words. (Must tell Geordie correct spelling!!)
Is Partick McGill's book about the Blachwater Dam above Kinlochleven? I read it many years ago and I know there is a book about that one, with details of the deaths / navvies graveyard etc- - and how they would walk over the Devils Staircase to go to Kingshouse? Or did I make that up? Maybe Kinlochleven was 'dry' back then?
(These routes are now part of The West Highland Way.)
I just found on google a page called Navvies Roads to Blackwater Dam
Blackwater is the longest in the Highlands