[OSM-talk-ie] Coastline on tidal rivers

Colm Moore colmmoore72 at hotmail.com
Wed Jun 30 20:41:23 UTC 2021


Many high-water marks coincide with weirs, dams or some form of natural 'rapids' (rapid may be overstating things).

On older maps, it will be indicated by “HWM”, “Highest point to which ordinary tides (“O.T.”) flow” or similar. However, those older maps may be out of date.

As best I can determine.


1. Liffey, weir at Islandbridge, Dublin.
2. Tolka, between Ballybough and Drumcondra.
3. Sluice, Portmarnock Bridge.
4. Broadmeadow, east of Lissenhall Bridge - the estuary is semi-tidal above the railway viaduct at Malahide.
5. Bracken, weir at Balbriggan.
6. Boyne, weirs at Oldbridge House, west of Drogheda.
7. Newry, weir at Newry.
8. Lagan, weir at Belfast city centre. Possibly semi-tidal.
9. Bann, south of Coleraine.
10. Foyle, adjacent to weir at Strabane.
11. Erne, Ballyshannon.
12. Moy, weir at Ballina.
13. Corrib, Galway City Centre.
14. Fergus, weir at Ennis.
15. Shannon, Ardnacrusha Dam / weir at Corbally Baths, Limerick.
16. Bandon, somewhere between Innishannon and weir at Bandon.
17. Douglas / Tramore, Douglas village.
18. Lee, waterworks weir at Lee Road, Cork.
19. Glashaboy, weir at Glanmire village.
20. Owenacurra, footbridge at Midleton village.
21. Blackwater, east of Lismore.
22. Suir, likely the weir west of Carrick-on-Suir, Tipperary.
23. Nore, north of Inistioge.
24. Barrow, weir north of Saint Mullins village.
25. Slaney, likely the weir at Enniscorthy.
26. Dargle, Bray town centre.
27. Dodder, likely the weir at Ballsbridge, Dublin.

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