Fourth Lake
Halifax, Nova Scotia22 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.
- 10 ft max depth
- Limited data
Fourth 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: 1.7 m visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 2.8 µg/L. Maximum depth: 9.8 ft. Surface area: 53.9 acres.
- Clarity
- 1.7 m
- Max depth
- 3 m
- Area
- 22 ha
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Why Fourth 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 Fourth 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.
Fourth Lake is a 54-acre lake in Halifax County, Nova Scotia with a maximum depth of 10 feet (6-foot average).
Source: Nova Scotia Environment and Climate Change — not the EPA Water Quality Portal, last sampled 2005-09-08. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Fourth Lake
These are the measurements NSECC publishes for Fourth Lake. No A–F letter applies here: see why.
Murky, only visible to about 5.6 ft. Phosphorus 7 µg/L. Chlorophyll-a 2.8 µg/L. TSI 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.7 m | Measured, not scored |
| Phosphorus | 7 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 2.8 µg/L | Measured, not scored |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 3 m |
| Average Depth | 1.8 m |
| Surface Area | 22 ha |
Fishing Fourth Lake
Nearby Lakes in Halifax
Frequently asked questions about Fourth Lake
Where is Fourth Lake?
- Fourth 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 Fourth Lake?
- Fourth 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: 1.7 m visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 2.8 µg/L. Maximum depth: 9.8 ft. Surface area: 53.9 acres.
Is Fourth Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Fourth Lake?
- Fourth Lake has a maximum depth of 9.8 feet and an average depth of 5.9 feet. The lake covers 53.9 acres.
Explore Fourth Lake across LakeQuality
More lakes in Nova Scotia
Other Lakes in Nova Scotia
Mesotrophic Lakes in Nova Scotia
Where this data comes from
9 measurements from 3 monitoring stations, 1958–2005. Retrieved from Nova Scotia open data (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- DOE
DOE2 samples · 1958–1983 - NSDAF
NSDAF1 sample · 2005 - NS Dept. of Fisheries
NS Dept. of Fisheries1 sample · 1996 - Lands and Forests, NSDOE
Lands and Forests, NSDOE1 sample · 1981 - Lands and Forests
Lands and Forests1 sample · 1979
Monitoring station identifiers (3)
24383951
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.