Thunder Bay District County, Ontario · Water Quality Report Card
Louise Lake
Louise Lake in Thunder Bay District, Ontario received a water quality grade of B (Good). Water clarity: 2.5 m visibility. Phosphorus: 7 µg/L.
- Clarity
- 2.5 m
- Type
- Oligotrophic
Louise Lake is a cold, clear oligotrophic lake in Thunder Bay District County, Ontario. Water quality is graded B based on 2 sampling years through 2024. Compared to the 301 other monitored lakes in Thunder Bay District County, Louise Lake ranks #176 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2024-08-01. Grade methodology: LakeGrade methodology.
Watch Louise Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 8.2 ft. Phosphorus level: 7 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 m | C |
| Phosphorus | 7 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Louise Lake
Compare lakeside cabins, hotels, and vacation rentals near Louise Lake in Thunder Bay District, 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 Louise 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 Louise Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Louise Lake — straight to your inbox. No spam, unsubscribe anytime.
Fishing Louise Lake
Location
County Ranking
Ranked #176 of 302 lakes in Thunder Bay District
Cleaner Lakes Within 30 Miles
Louise Lake holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Thunder Bay District
Explore Louise Lake across LakeGrade
More Ontario Lake Rankings
Other Grade B Lakes in Ontario
Oligotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Louise 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: 2024-08-01
Monitoring stations: