Loon Lake Outlet
Cook County, MinnesotaView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- Limited data
Ask about Loon Lake Outlet
Answers come straight from the public measurements and survey records on this page.
Loon Lake Outlet in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported.
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Loon Lake Outlet is a lake in Cook County, Minnesota. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2020-07-20. Grade methodology: LakeQuality methodology.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Loon Lake Outlet is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Loon Lake Outlet
These are the measurements Minnesota PCA publishes for Loon Lake Outlet, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Fishing Loon Lake Outlet
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | 0 m/yr | 2 |
| Phosphorus | ↑ Improving | -3.18 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -0.38 µg/L/yr | 3 |
Nearby Lakes in Cook County
Frequently asked questions about Loon Lake Outlet
Where is Loon Lake Outlet?
- Loon Lake Outlet is a lake in Cook County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Loon Lake Outlet?
- Loon Lake Outlet in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported.
Is Loon Lake Outlet 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
1 measurement from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- 21GPBCH - Grand Portage Beaches (Tribal)
21GPBCH1 sample · 2020
Analytical methods
- Turbidity by Nephelometry
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.