Giant Lake
Guysborough, Nova Scotia57 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.
- 39 ft max depth
- Limited data
Giant Lake in Guysborough, 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: 4.8 m visibility. Maximum depth: 39.4 ft. Surface area: 140.8 acres.
- Clarity
- 4.8 m
- Max depth
- 12 m
- Area
- 57 ha
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Why Giant 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 Giant Lake at any level of sampling. Sampling here has recorded water clarity, but not 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.
Giant Lake is a 141-acre lake in Guysborough County, Nova Scotia with a maximum depth of 39 feet (12-foot average).
Source: Nova Scotia Environment and Climate Change — not the EPA Water Quality Portal, last sampled 1973-08-07. Grade methodology: LakeQuality methodology.
What Giant Lake is good for
From access and monitoring records, not editorial picks.
- Clear water15.7 ft of visibility
- Deep water39.4 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 Giant Lake
These are the measurements NSECC publishes for Giant Lake. No A–F letter applies here: see why.
Crystal clear, you can see 15.7 ft down. TSI 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.8 m | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 12 m |
| Average Depth | 3.7 m |
| Surface Area | 57 ha |
Fishing Giant Lake
Nearby Lakes in Guysborough
Frequently asked questions about Giant Lake
Where is Giant Lake?
- Giant Lake is a lake in Guysborough, 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 Giant Lake?
- Giant Lake in Guysborough, 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: 4.8 m visibility. Maximum depth: 39.4 ft. Surface area: 140.8 acres.
Is Giant Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Giant Lake?
- Giant Lake has a maximum depth of 39.4 feet and an average depth of 12.1 feet. The lake covers 140.8 acres.
Explore Giant Lake across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 1973. Retrieved from Nova Scotia open data (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- DFO
DFO2 samples · 1973 - Submitting organization not recorded for these samples1 sample · 1978
Some records reached the portal without a submitting organization. Those samples are counted above but not attributed.
Monitoring station identifiers (1)
76
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.