Pretty Mary Lake
Annapolis, Nova Scotia68 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.
- 23 ft max depth
- Limited data
Pretty Mary Lake in Annapolis, 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: 1.6 m visibility. Phosphorus: 4 µg/L. Maximum depth: 23 ft. Surface area: 169 acres.
- Clarity
- 1.6 m
- Max depth
- 7 m
- Area
- 68 ha
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Why Pretty Mary 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 Pretty Mary Lake at any level of sampling. Sampling here has recorded water clarity and phosphorus, but not 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.
Pretty Mary Lake is a 169-acre lake in Annapolis County, Nova Scotia with a maximum depth of 23 feet (8-foot average).
Source: Nova Scotia Environment and Climate Change — not the EPA Water Quality Portal, last sampled 1982-08-01. 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 Pretty Mary Lake
These are the measurements NSECC publishes for Pretty Mary Lake. No A–F letter applies here: see why.
Murky, only visible to about 5.1 ft. Phosphorus 4 µg/L. TSI 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.55 m | Measured, not scored |
| Phosphorus | 4 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 7 m |
| Average Depth | 2.3 m |
| Surface Area | 68 ha |
Fishing Pretty Mary Lake
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Frequently asked questions about Pretty Mary Lake
Where is Pretty Mary Lake?
- Pretty Mary Lake is a lake in Annapolis, 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 Pretty Mary Lake?
- Pretty Mary Lake in Annapolis, 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: 1.6 m visibility. Phosphorus: 4 µg/L. Maximum depth: 23 ft. Surface area: 169 acres.
Is Pretty Mary Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Pretty Mary Lake?
- Pretty Mary Lake has a maximum depth of 23 feet and an average depth of 7.5 feet. The lake covers 169 acres.
Explore Pretty Mary Lake across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 1982. Retrieved from Nova Scotia open data (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Lands and Forests, NSDOE
Lands and Forests, NSDOE1 sample · 1982
Monitoring station identifiers (1)
3
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.