Lake of Bays
Muskoka District, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for Lake of Bays. Here is what has been measured.
- 125 ft max depth
Lake of Bays in Muskoka District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 5.5 m visibility. Phosphorus: 6 µg/L.
Lake of Bays is a lake in Muskoka District County, Ontario with an estimated average depth of about 125 feet.
Source: Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring) — not the EPA Water Quality Portal, last sampled 2025-10-12. Methodology: how these readings are compared.
What Lake of Bays is good for
From access and monitoring records, not editorial picks.
- Clear water18 ft of visibility
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake of Bays 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 Lake of Bays
These are the measurements Ontario MECP publishes for Lake of Bays, 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 18 ft down. Phosphorus 6 µg/L. TSI 33.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.5m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 6µg/L | Measured, not scored 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. | 33 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Lake of Bays
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~38.1 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 Lake of Bays.
Lake Size & Watershed
Watershed (drainage) area
376 sq mi
HydroLAKES / HydroSHEDS
Surface area
16,719 acres
HydroLAKES / HydroSHEDS
Shoreline
113.2 mi
HydroLAKES / HydroSHEDS
Elevation
1,030 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 Lake of Bays
Nearby Lakes in Muskoka District
Frequently asked questions about Lake of Bays
Where is Lake of Bays?
- Lake of Bays is a lake in Muskoka District, Ontario. Its water-quality measurements are published by Ontario MECP and shown on this page as reported.
What is the water quality of Lake of Bays?
- Lake of Bays in Muskoka District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 5.5 m visibility. Phosphorus: 6 µg/L.
Is Lake of Bays safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lake of Bays?
- No published bathymetric survey covers Lake of Bays, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 125 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 Lake of Bays 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)