Altermatt Lake
Altermatt Lake in Brown County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 125 acres.
- Area
- 125 acres
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Why Altermatt 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 Altermatt 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.
Altermatt Lake is a 125-acre lake in Brown 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 Altermatt 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 Altermatt Lake
Compare lakeside cabins, hotels, and vacation rentals near Altermatt Lake in Brown 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 Altermatt Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 125 acres |
No bathymetric survey has been published for Altermatt Lake, so its depth is not documented here.
Fishing Altermatt Lake
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Frequently asked questions about Altermatt Lake
Where is Altermatt Lake?
- Altermatt Lake is a lake in Brown 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 Altermatt Lake?
- Altermatt Lake in Brown County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 125 acres.
Is Altermatt Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Altermatt 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 Altermatt 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