Lanark County, Ontario · Water Quality Report Card
Robertson Lake
Robertson Lake in Lanark, Ontario received a water quality grade of A (Excellent). Water clarity: 8.5 m visibility. Phosphorus: 10.8 µg/L.
- Clarity
- 8.5 m
- Type
- Oligotrophic
Robertson Lake is a cold, clear oligotrophic lake in Lanark County, Ontario. Water quality is graded A based on 2 sampling years through 2002. Compared to the 28 other monitored lakes in Lanark County, Robertson Lake ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2002-07-02. Grade methodology: LakeGrade methodology.
Watch Robertson Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 27.9 ft down. Phosphorus level: 10.8 µg/L. Trophic State Index: 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.5 m | A |
| Phosphorus | 10.8 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Robertson Lake
Compare lakeside cabins, hotels, and vacation rentals near Robertson Lake in Lanark, Ontario — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Robertson Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Robertson Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Robertson Lake — straight to your inbox. No spam, unsubscribe anytime.
Fishing Robertson Lake
Location
County Ranking
Ranked #11 of 29 lakes in Lanark
Nearby Lakes in Lanark
Explore Robertson Lake across LakeGrade
More Ontario Lake Rankings
Other Grade A Lakes in Ontario
Oligotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Robertson 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: 2002-07-02
Monitoring stations: