Third Lake
Halifax, Nova Scotia83 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.
- 80 ft max depth
- Limited data
Third Lake in Halifax, 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: 4 m visibility. Phosphorus: 5.5 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Maximum depth: 80.1 ft. Surface area: 204 acres.
- Clarity
- 4 m
- Max depth
- 24.4 m
- Area
- 83 ha
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Why Third 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 Third 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.
Third Lake is a 204-acre lake in Halifax County, Nova Scotia with a maximum depth of 80 feet (28-foot average).
Source: Nova Scotia Environment and Climate Change — not the EPA Water Quality Portal, last sampled 1990-11-14. Grade methodology: LakeQuality methodology.
What Third Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13.1 ft of visibility
- Deep water80.1 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 Third Lake
These are the measurements NSECC publishes for Third Lake. No A–F letter applies here: see why.
Good clarity, visible to about 13.1 ft. Phosphorus 5.5 µg/L. Chlorophyll-a 1.4 µg/L. TSI 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4 m | Measured, not scored |
| Phosphorus | 5.5 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 1.4 µg/L | Measured, not scored |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 24.4 m |
| Average Depth | 8.6 m |
| Surface Area | 83 ha |
Fishing Third Lake
Nearby Lakes in Halifax
Frequently asked questions about Third Lake
Where is Third Lake?
- Third Lake is a lake in Halifax, 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 Third Lake?
- Third Lake in Halifax, 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: 4 m visibility. Phosphorus: 5.5 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Maximum depth: 80.1 ft. Surface area: 204 acres.
Is Third Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Third Lake?
- Third Lake has a maximum depth of 80.1 feet and an average depth of 28.1 feet. The lake covers 204 acres.
Explore Third Lake across LakeQuality
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Where this data comes from
10 measurements from 2 monitoring stations, 1971–1990. Retrieved from Nova Scotia open data (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Soil and Water Conservation Society of Metro
Soil and Water Conservation Society of Metro3 samples · 1990 - Lands and Forests
Lands and Forests1 sample · 1973 - Submitting organization not recorded for these samples1 sample · 1971
Some records reached the portal without a submitting organization. Those samples are counted above but not attributed.
Monitoring station identifiers (2)
86642
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.