Upper Loon Lake
Upper Loon Lake in Cass County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 119 acres.
- Area
- 119 acres
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Why Upper Loon Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Upper Loon Lake, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by MPCA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Upper Loon Lake is a 119-acre lake in Cass County, Minnesota.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled recent years. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Upper Loon Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Upper Loon Lake
Compare lakeside cabins, hotels, and vacation rentals near Upper Loon Lake in Cass County, Minnesota — 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 Upper Loon Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 119 acres |
No bathymetric survey has been published for Upper Loon Lake, so its depth is not documented here.
Fishing Upper Loon Lake
Nearby Lakes in Cass County
Frequently asked questions about Upper Loon Lake
Where is Upper Loon Lake?
- Upper Loon Lake is a lake in Cass County, Minnesota. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Upper Loon Lake?
- Upper Loon Lake in Cass County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 119 acres.
Is Upper Loon Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Upper Loon Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Upper Loon Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Lake details from Minnesota DNR LakeFinder