Portmore Lough — water body quality
near Glenavy, Lisburn and Castlereagh
Portmore Lough is a lake in Lisburn and Castlereagh, near Glenavy, covering 1.8 km².
Official classification
Bad
Assessed 2026
Bad is the lowest Water Framework Directive class, indicating severe alteration: large parts of the biological community expected in an undisturbed water body of this type are missing.
| Stretch | Status |
|---|---|
| Portmore Lough | Bad |
Overall status reflects the worst stretch (precautionary).
This water body
- Type
- Lake
- Area
- 1.8 km²
- County
- Lisburn and Castlereagh
- Location
- 54.5583, -6.2787
Others in Lisburn and Castlereagh
This page shows water-quality information, not swim-safety advice. For today's conditions and swim-safety guidance, check Water Safety Ireland.
Official classifications on this page contain DAERA/NIEA Water Framework Directive classification data © Crown copyright, licensed under Open Government Licence v3.0.