Hello LWJ.
I have just looked online at the map showing the A2.
I found this bit of information on A Manx Note Book.
Three miles from Ramsey is the Hibernian inn, a point from which tourists often start for the ascent of North Barrule. It is also a resting-place for those who visit the Ballaglass waterfall, which is situated directly opposite, about ~ mile down the glen. The road leading to it is near the inn, and the journey there and back will occupy about an hour and a half. It is usual to walk there, but a carriage can be taken to within a very short distance of the fall.
www.isle-of-man.com/manxnotebook/fulltext/jk1874/p107.htm
I will see if I can find any more maps.
Averil