Further details:

Knockaderry is a natural lake, but it has supplied water to Waterford city since 1887.  There is also trout fishing (from boats) here.  Access is restricted but there is usually little need to walk around either lake as birdwatching can be done from the road (though a telescope is useful).  The reservoir is slightly more awkward to get to than Ballyshunnock, but is well worth a visit.

A similar range of waterfowl species to Ballyshunnock is present in winter, and some species are most easily seen in the sheltered backwater at the west side of the lake, viewable from the road.  In the late 1980s, this small lake, separated from the main lake by a roadway, became densely vegetated, particularly in summer.  Whooper Swan, Wigeon, and Teal numbers can be higher here than on the other lakes, reflecting the prolific aquatic plant growth.  Diving ducks (Pochard and Tufted Duck) feed mainly on the large lake, and often a few Goldeneye.  Odd visitors have included Red-necked Grebe, Smew, Green-winged Teal and Ruddy Duck.

Fewer wintering waders occur than at Ballyshunnock, but there have been January records of Woodcock and Green Sandpiper, with occasional autumn records of Green and Common Sandpipers, Ruff and Greenshank.  In some years, water levels have fallen sufficiently to expose large areas of mud by the autumn - in such conditions,  Baird’s Sandpiper and two Pectoral Sandpipers were found in September 1984, and another Pectoral Sandpiper in October 2004.