Des Mille Lacs Lake
Thunder Bay District, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for Des Mille Lacs Lake. Here is what has been measured.
Des Mille Lacs Lake in Thunder Bay District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 1.8 m visibility. Phosphorus: 17.7 µg/L.
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Des Mille Lacs Lake is a lake in Thunder Bay District County, Ontario.
Source: Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring) — not the EPA Water Quality Portal, last sampled 2025-08-01. Grade methodology: LakeQuality methodology.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Des Mille Lacs 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 Des Mille Lacs Lake
These are the measurements Ontario MECP publishes for Des Mille Lacs Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5.9 ft. Phosphorus 17.7 µg/L. TSI 49.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 m | Measured, not scored |
| Phosphorus | 17.7 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
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Frequently asked questions about Des Mille Lacs Lake
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Answers come straight from the public measurements and survey records on this page.
Where is Des Mille Lacs Lake?
- Des Mille Lacs 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 Des Mille Lacs Lake?
- Des Mille Lacs Lake in Thunder Bay District, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 1.8 m visibility. Phosphorus: 17.7 µg/L.
Is Des Mille Lacs Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
Measurements for Des Mille Lacs 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.