Stewart Lake
Thunder Bay District, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for Stewart Lake. Here is what has been measured.
- 67 ft max depth
- Limited data
Stewart Lake in Thunder Bay District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Phosphorus: 6.5 µg/L.
Stays via Stay22
Stays near Stewart Lake
Compare lakeside cabins, hotels, and vacation rentals near Stewart Lake in Thunder Bay District, Ontario — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Stewart Lake
Prices for Sep 18–20, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Stewart Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Stewart Lake is a lake in Thunder Bay District County, Ontario with an estimated average depth of about 67 feet.
Source: Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring) — not the EPA Water Quality Portal, last sampled 2006-05-15. Grade methodology: LakeQuality methodology.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Stewart 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 Stewart Lake
These are the measurements Ontario MECP publishes for Stewart Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 6.5 µg/L. TSI 31.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 6.5 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 31 | Oligotrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~20.4 m est. |
| Average Depth | ~7.6 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 Stewart Lake.
Lake Size & Watershed
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.
Fishing Stewart Lake
Nearby Lakes in Thunder Bay District
Frequently asked questions about Stewart Lake
Ask about Stewart Lake
Answers come straight from the public measurements and survey records on this page.
Where is Stewart Lake?
- Stewart Lake is a lake in Thunder Bay District, Ontario. Its water-quality measurements are published by Ontario MECP and shown on this page as reported.
What is the water quality of Stewart Lake?
- Stewart Lake in Thunder Bay District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Phosphorus: 6.5 µg/L.
Is Stewart Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Stewart Lake?
- No published bathymetric survey covers Stewart Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 67 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Stewart Lake across LakeQuality
More lakes in Ontario
Other Lakes in Ontario
Oligotrophic Lakes in Ontario
Where this data comes from
Measurements for Stewart 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)