The search term most often used to find this site is Ardnacrusha, which scores 1655, almost twice as many as the next term, the generic Waterways (875). But other variants occur too: Ardnacrusha Lock is at position 3 (768), Ardnacrusha power station 18 (274), ESB Ardnacrusha 21 (225), Ardnacrusha ESB 33 (169), Ard na Crusha 43 (140), Ardnacrusha hydroelectric power station 58 (120), Ardnacrusha dam 86 (89); Parteen Weir is at 14 (369).
Thus I deduce that Ardnacrusha is by far the most popular artefact on Irish inland waterways.
Here is the full top twenty.
1 Ardnacrusha 1,655
2 Waterways 875
3 Ardnacrusha lock 768
4 Wooden boat 728
5 Skies 613
6 Athlone 573
7 Strancally castle 483
8 Lough Erne 480
9 Homemade boat 460
10 Wooden boats 453
11 Irish waterways history 451
12 Boats 448
13 Irish waterways 393
14 Parteen Weir 369
15 Flying Fifteen 344
16 Homemade boats 333
17 Pioner Multi 301
18 Ardnacrusha power station 274
19 Johnstown Co Kilkenny 247
20 Ormond Castle 237
Most hits on this site come from searches rather than links.
Irish waterways history 