Mattie Lake
Guysborough, Nova Scotia30 haView mapDirections
NSECC publishes the water-quality measurements for Mattie Lake. Here is what has been measured.
- 23 ft max depth
- Limited data
Mattie Lake in Guysborough, Nova Scotia has water-quality measurements published by NSECC, shown here as reported. Water clarity: 2.9 m visibility. Maximum depth: 23 ft. Surface area: 73.6 acres.
Mattie Lake is a 74-acre lake in Guysborough County, Nova Scotia with a maximum depth of 23 feet (7-foot average).
Source: Nova Scotia Environment and Climate Change — not the EPA Water Quality Portal, last sampled 1976-07-20. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Mattie Lake is safe to swim in today is a call for Nova Scotia Environment and Climate Change and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Mattie Lake
These are the measurements NSECC publishes for Mattie Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9.5 ft. TSI 45.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.9m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading 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. | 45 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Lake Details
Max depth
7 m
Average depth
2.2 m
Surface area
30 ha
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Frequently asked questions about Mattie Lake
Where is Mattie Lake?
- Mattie Lake is a lake in Guysborough, Nova Scotia. Its water-quality measurements are published by NSECC and shown on this page as reported.
What is the water quality of Mattie Lake?
- Mattie Lake in Guysborough, Nova Scotia has water-quality measurements published by NSECC, shown here as reported. Water clarity: 2.9 m visibility. Maximum depth: 23 ft. Surface area: 73.6 acres.
Is Mattie Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Mattie Lake?
- Mattie Lake has a maximum depth of 23 feet and an average depth of 7.2 feet. The lake covers 73.6 acres.
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Where this data comes from
1 measurement from 1 monitoring station, 1976. Retrieved from Nova Scotia open data (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- DFO
DFO1 sample · 1976
Monitoring station identifiers (1)
22
Canadian lakes are published with the measurements their provincial programme reports. See where the data comes from and data sources.