Where is Annaghmore Lough?

Annaghmore Lough is a lake in Roscommon, Ireland. This page reports official water-quality measurements, shown as reported.

Is Annaghmore Lough safe to swim in?

Annaghmore Lough has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.

Annaghmore Lough

Roscommon, IrelandView map Directions

EPA Ireland publishes the water-quality measurements for Annaghmore Lough. Here is what has been measured.

Phosphorus

11 µg/L

Less phosphorus than most

Measured by EPA Ireland

Chlorophyll-a

3.4 µg/L

Typical for Ireland

Measured by EPA Ireland

Limited data

See the measurements Directions Where to stay

Annaghmore Lough in Roscommon, Ireland has official water-quality measurements, shown as reported. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 3.4 µg/L.

Loading map…

How Annaghmore Lough is classified

Annaghmore Lough in Ireland is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.

LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.

Monitoring: the Environmental Protection Agency of Ireland, via UNEP GEMS/Water, with WFD lake names from EPA Ireland.

Annaghmore Lough is a lake in Roscommon County, Ireland.

Source: the Environmental Protection Agency of Ireland, via UNEP GEMS/Water, with WFD lake names from EPA Ireland — not the EPA Water Quality Portal, last sampled 2023-12-04. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Annaghmore Lough is safe to swim in today is a call for the Environmental Protection Agency of Ireland, via UNEP GEMS/Water, with WFD lake names from EPA Ireland and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Get alerts for Annaghmore Lough →

Water quality measurements for Annaghmore Lough

These are the measurements EPA Ireland publishes for Annaghmore Lough. More on the source.

No clarity data. Phosphorus 11 µg/L. Chlorophyll-a 3.4 µg/L. TSI 41.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)		No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	11µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	3.4µg/L	Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	41	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Annaghmore Lough

Answers come straight from the public measurements and survey records on this page.

Stays via Stay22

Stays near Annaghmore Lough

Compare lakeside cabins, hotels, and vacation rentals near Annaghmore Lough in Roscommon, Ireland — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Annaghmore Lough

Prices for Oct 2–4, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Follow Annaghmore Lough’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Annaghmore Lough

→ Annaghmore Lough fishing regulations (limits, seasons, special rules)

Frequently asked questions about Annaghmore Lough

Where is Annaghmore Lough?: Annaghmore Lough is a lake in Roscommon, Ireland. This page reports official water-quality measurements, shown as reported.
What is the water quality of Annaghmore Lough?: Annaghmore Lough in Roscommon, Ireland has official water-quality measurements, shown as reported. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 3.4 µg/L.
Is Annaghmore Lough safe to swim in?: Annaghmore Lough has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.

Explore Annaghmore Lough across LakeQuality

Lake Fishing Forecast

Species activity outlook by water temperature and season

More lakes in Ireland

Lakes in Ireland

Official water quality for lakes in Ireland

Lake water quality by country

EU bathing ratings and named-lake measurements

Where this data comes from

81 measurements from 1 monitoring station, 2016–2023. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-16.

Collected and reported by

European Environment Agencyeuropeanenvironmentagenc81 samples · —

Analytical methods

GEMStat OPEN / CC BY 4.0
EPA Ireland WFD lake waterbodies CC BY 4.0

Monitoring station identifiers (1)

IRL00294

Authority classifications are shown as the authority published them. See where the data comes from and data sources.