Aye, right enough. I did a wee bit of research there (you can tell im busy at work) and sure enough, its also known as Knockruan Loch.
As for the Lussa, I can remember walking across it with the "oldfla" when I was about 5 or 6 years of age which would make it in the late 80's and seeing the ruin and the road to the north-east of the boathouse. I have never seen it since. The ruin to the south of the boathouse that you can see most of the time is where I caught one of my biggest troots, a 2 pounder!! Pity it wasnt on a competition day. "Old" Reid wasnt happy as its probably the only time I have ever finished the day with a heavier basket!
He will always be the "oldfla" as I will always be the "youngfla".