Sudbury District County, Ontario · 47.31°N · Water Quality Report Card
Bear Lake
Bear Lake in Sudbury District, Ontario received a water quality grade of D (Poor). Water clarity: 0.8 m visibility. Phosphorus: 41.6 µg/L.
- Clarity
- 0.8 m
- Type
- Eutrophic
Bear Lake is a productive, nutrient-rich eutrophic lake in Sudbury District County, Ontario. Water quality is graded D based on 2 sampling years through 2025. Compared to the 264 other monitored lakes in Sudbury District County, Bear Lake ranks #265 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-08-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 2.5 ft of visibility. Phosphorus level: 41.6 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.75 m | F |
| Phosphorus | 41.6 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Bear Lake
Location
County Ranking
Ranked #265 of 265 lakes in Sudbury District
Cleaner Lakes Within 30 Miles
Bear Lake holds Grade D. 5 nearby lakes hold higher grades.
- AGalloway LakeAlgoma District · 10.4 mi · Two grade letters higher (D → A)
- ANinegee LakeSudbury District · 11.1 mi · Two grade letters higher (D → A)
- BCaesar LakeSudbury District · 7.4 mi · Two grade letters higher (D → B)
- BMegisan LakeSudbury District · 11.3 mi · Two grade letters higher (D → B)
- BGoulais LakeAlgoma District · 11.7 mi · Two grade letters higher (D → B)
Nearby Lakes in Sudbury District
Explore Bear Lake across LakeGrade
More Ontario Lake Rankings
Other Grade D Lakes in Ontario
Eutrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Bear 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: 2025-08-01
Monitoring stations: