Thunder Bay District County, Ontario · Water Quality Report Card
Lac des Mille Lacs Lake
Lac des Mille Lacs Lake in Thunder Bay District, Ontario received a water quality grade of C (Fair). Water clarity: 1.3 m visibility. Phosphorus: 22.7 µg/L.
- Clarity
- 1.3 m
- Type
- Eutrophic
Lac des Mille Lacs Lake is a productive, nutrient-rich eutrophic lake in Thunder Bay District County, Ontario. Water quality is graded C based on 2 sampling years through 2024. Compared to the 301 other monitored lakes in Thunder Bay District County, Lac des Mille Lacs Lake ranks #285 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2024-05-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.3 ft. Phosphorus level: 22.7 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 m | D |
| Phosphorus | 22.7 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Lac des Mille Lacs Lake
Location
County Ranking
Ranked #285 of 302 lakes in Thunder Bay District
Cleaner Lakes Within 30 Miles
Lac des Mille Lacs Lake holds Grade C. 3 nearby lakes hold higher grades.
- BTomlinson LakeThunder Bay District · 10.4 mi · Higher grade (C → B)
- BPeterkin LakeThunder Bay District · 12.2 mi · Higher grade (C → B)
- BDes Mille Lacs LakeThunder Bay District · 3.3 mi · Higher grade (C → B)
Nearby Lakes in Thunder Bay District
Explore Lac des Mille Lacs Lake across LakeGrade
More Ontario Lake Rankings
Other Grade C Lakes in Ontario
Eutrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Lac des Mille Lacs Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2024-05-29
Monitoring stations: