One other possible source of confusion is this information board.
The information board is sited several hundred metres east of the canal and would be confusing to anyone who thought they should be able to see the canal at that point.
Here is an extract from the OSI map, showing the end of the canal in relation to the town of Mallow.
A close-up of the OSI map (drawn, remember, well after the canal closed) shows the canal ending on the north side of the road.
There is a trace, I believe , of the canal at the front of the Garden Centre, near to the Racecourse and East of it. In times of flood this overflows across the road and I believe indicates the point at which the canal crosses to the other side of the road to join the river. The road I think postdates the canal and thus there would be no bridge in evidence here.
On the OSI maps, you can see the racecourse and the garden centre if you select Ortho 2005. Unfortunately the Google satellite view is too blurred to be of any use.
Richard Norton says that these three photographs (taken in January 2012) “are to the south of the road and water is flowing under the road through some sort of culvert or unfinshed work in stone.”
[These] pics are opposite the garden centre. You may be able to make out there is a bridge or culvert running there of stone and water runs through to the Blackwater. This is immediately east of the Racecourse boundary. The bit that LOOKS like a canal here might be something to do with works not completed perhaps (could just be boggy ground). The opposite side of the road where the garden centre is I found the remains of the canal still exist and run west past the Racecourse where they may have been obliterated by roadworks in the early 1990s but looking at the tree line, Id say they survive almost intact.
He also says:
I had the good fortune to meet the man from the Garden Centre who told me that the bit he has landscaped was the terminus of the Canal, presumably there would have been a wharf here and coal would have been hauled into Mallow from there. This bit is cut off from the rest of the line by an access road of some sort which must be later.
I am very grateful for this extra information and for the photographs.