Frontenac County, Ontario · Water Quality Report Card
Carnahan Lake
Carnahan Lake in Frontenac, Ontario received a water quality grade of A (Excellent). Water clarity: 3.2 m visibility. Phosphorus: 19 µg/L.
- Clarity
- 3.2 m
- Type
- Mesotrophic
Carnahan Lake is a mesotrophic lake in Frontenac County, Ontario. Water quality is graded A based on 2 sampling years through 2016. Compared to the 106 other monitored lakes in Frontenac County, Carnahan Lake ranks #60 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2016-05-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 10.5 ft. Phosphorus level: 19 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.2 m | B |
| Phosphorus | 19 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Carnahan Lake
Location
County Ranking
Ranked #60 of 107 lakes in Frontenac
Nearby Lakes in Frontenac
Explore Carnahan Lake across LakeGrade
More Ontario Lake Rankings
Other Grade A Lakes in Ontario
Mesotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Carnahan 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: 2016-05-20
Monitoring stations: