Upper Rideau Lake
Leeds and Grenville Counties, OntarioView mapDirections
Ontario MECP publishes the water-quality measurements for Upper Rideau Lake. Here is what has been measured.
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Answers come straight from the public measurements and survey records on this page.
Upper Rideau Lake in Leeds and Grenville Counties, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 3.8 m visibility. Phosphorus: 20 µg/L.
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Upper Rideau Lake is a lake in Leeds and Grenville Counties County, Ontario.
Source: Ontario open-data programmes (Lake Partner Program and Broad-scale Monitoring) — not the EPA Water Quality Portal, last sampled 2025-10-17. Grade methodology: LakeQuality methodology.
What Upper Rideau Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12.5 ft of visibility
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Upper Rideau 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 Upper Rideau Lake
These are the measurements Ontario MECP publishes for Upper Rideau Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 12.5 ft. Phosphorus 20 µg/L. TSI 44.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.8 m | Measured, not scored |
| Phosphorus | 20 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Upper Rideau Lake
Nearby Lakes in Leeds and Grenville Counties
Frequently asked questions about Upper Rideau Lake
Where is Upper Rideau Lake?
- Upper Rideau Lake is a lake in Leeds and Grenville Counties, Ontario. Its water-quality measurements are published by Ontario MECP and shown on this page as reported.
What is the water quality of Upper Rideau Lake?
- Upper Rideau Lake in Leeds and Grenville Counties, Ontario has water-quality measurements published by Ontario MECP, shown here as reported. Water clarity: 3.8 m visibility. Phosphorus: 20 µg/L.
Is Upper Rideau 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 Upper Rideau 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.