Parry Sound District County, Ontario · Water Quality Report Card
Yarrow Lake
Yarrow Lake in Parry Sound District, Ontario received a water quality grade of B (Good). Water clarity: 3.1 m visibility.
- Clarity
- 3.1 m
- Type
- Mesotrophic
Yarrow Lake is a mesotrophic lake in Parry Sound District County, Ontario. Water quality is graded B based on 1 sampling years through 2025. Compared to the 230 other monitored lakes in Parry Sound District County, Yarrow Lake ranks #190 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2025-05-12. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10.2 ft. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 m | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Yarrow Lake
Location
County Ranking
Ranked #190 of 231 lakes in Parry Sound District
Cleaner Lakes Within 30 Miles
Yarrow Lake holds Grade B. 5 nearby lakes hold higher grades.
- AWindfall LakeParry Sound District · 1.7 mi · Higher grade (B → A)
- ALioness LakeParry Sound District · 0.9 mi · Higher grade (B → A)
- ABack LakeParry Sound District · 1.9 mi · Higher grade (B → A)
- AHorseshoe LakeParry Sound District · 2.1 mi · Higher grade (B → A)
- ALiebeck LakeParry Sound District · 2.2 mi · Higher grade (B → A)
Nearby Lakes in Parry Sound District
Explore Yarrow Lake across LakeGrade
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Other Grade B Lakes in Ontario
Mesotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Yarrow 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: 2025-05-12
Monitoring stations: