Trefry Lake
Yarmouth, Nova Scotia27 haView mapDirections
No A–F letter for this lake. The letter is scored against EPA reference conditions for a lake’s ecoregion, and those stop at the US border. Here is what has been measured.
- 47 ft max depth
- Limited data
Trefry Lake in Yarmouth, Nova Scotia has water-quality measurements published by NSECC and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 3.2 m visibility. Phosphorus: 10.5 µg/L. Chlorophyll-a (algae): 6.9 µg/L. Maximum depth: 46.6 ft. Surface area: 67 acres.
- Clarity
- 3.2 m
- Max depth
- 14.2 m
- Area
- 27 ha
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Why Trefry Lake has no A–F letter
The LakeQuality letter is scored against EPA National Lakes Assessment reference conditions for a lake’s ecoregion, and those stop at the US border. There is no reference condition for Nova Scotia, so the scale cannot be applied to Trefry Lake at any level of sampling. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
This is not a gap in the monitoring record. NSECC publishes these measurements directly, and everything below that has been measured is reported on this page as NSECC reports it.
Monitoring: Nova Scotia Environment and Climate Change. Read the full grading methodology.
Trefry Lake is a 67-acre lake in Yarmouth County, Nova Scotia with a maximum depth of 47 feet.
Source: Nova Scotia Environment and Climate Change — not the EPA Water Quality Portal, last sampled 2004-07-19. Grade methodology: LakeQuality methodology.
What Trefry Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
- Deep water46.6 ft surveyed max depth
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Trefry Lake
These are the measurements NSECC publishes for Trefry Lake. No A–F letter applies here: see why.
Good clarity, visible to about 10.5 ft. Phosphorus 10.5 µg/L. Chlorophyll-a 6.9 µg/L. TSI 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.2 m | Measured, not scored |
| Phosphorus | 10.5 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 6.9 µg/L | Measured, not scored |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 14.2 m |
| Surface Area | 27 ha |
Fishing Trefry Lake
Nearby Lakes in Yarmouth
Frequently asked questions about Trefry Lake
Where is Trefry Lake?
- Trefry Lake is a lake in Yarmouth, Nova Scotia. Its water-quality measurements are published by NSECC, and it carries no A–F letter, because no reference condition exists for lakes in this region, so the assessment thresholds behind the A–F scale cannot be applied here.
What is the water quality grade for Trefry Lake?
- Trefry Lake in Yarmouth, Nova Scotia has water-quality measurements published by NSECC and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 3.2 m visibility. Phosphorus: 10.5 µg/L. Chlorophyll-a (algae): 6.9 µg/L. Maximum depth: 46.6 ft. Surface area: 67 acres.
Is Trefry Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Trefry Lake?
- Trefry Lake has a maximum depth of 46.6 feet. The lake covers 67 acres.
Explore Trefry Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 1981–2004. Retrieved from Nova Scotia open data (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- NSDAF
NSDAF1 sample · 2004 - NS Dept. of Fisheries
NS Dept. of Fisheries1 sample · 1992 - Lands and Forests, NSDOE
Lands and Forests, NSDOE1 sample · 1981
Monitoring station identifiers (1)
18
Canadian lakes are published with the measurements their provincial programme reports, and without a LakeQuality A–F letter. The letter is scored against EPA reference conditions for a lake’s ecoregion, and the EPA does not survey these lakes. See how grades are calculated and data sources.