Black Lake
Lanark, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for Black Lake. Here is what has been measured.
- 27 ft max depth
- Limited data
Black Lake in Lanark, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 4.6 m visibility.
Black Lake is a lake in Lanark County, Ontario with an estimated average depth of about 27 feet.
Source: Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring) — not the EPA Water Quality Portal, last sampled 2016-05-10. Methodology: how these readings are compared.
What Black Lake is good for
From access and monitoring records, not editorial picks.
- Clear water15.1 ft of visibility
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Black Lake is safe to swim in today is a call for the Ontario Ministry of the Environment, Conservation and Parks and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Black Lake
These are the measurements Ontario MECP publishes for Black Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 15.1 ft down. TSI 38.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.6m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 38 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Black Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~8.2 m est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Ontario has not published bathymetry for Black Lake.
Lake Size & Watershed
Watershed (drainage) area
26 sq mi
HydroLAKES / HydroSHEDS
Surface area
902 acres
HydroLAKES / HydroSHEDS
Shoreline
12 mi
HydroLAKES / HydroSHEDS
Elevation
456 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Fishing Black Lake
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Frequently asked questions about Black Lake
Where is Black Lake?
- Black Lake is a lake in Lanark, Ontario. Its water-quality measurements are published by Ontario MECP and shown on this page as reported.
What is the water quality of Black Lake?
- Black Lake in Lanark, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 4.6 m visibility.
Is Black Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Black Lake?
- No published bathymetric survey covers Black Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 27 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
Measurements for Black Lake come from Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring), not the EPA Water Quality Portal. Per-sample source details are not recorded for this lake. Contains information licensed under the Open Government Licence – Ontario. See data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)