Lannon Lake
Lannon Lake in Big Stone County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 113 acres.
- Area
- 113 acres
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Why Lannon 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 Lannon 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.
Lannon Lake is a 113-acre lake in Big Stone 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 Lannon 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 Lannon Lake
Compare lakeside cabins, hotels, and vacation rentals near Lannon Lake in Big Stone 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 Lannon Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 113 acres |
No bathymetric survey has been published for Lannon Lake, so its depth is not documented here.
Fishing Lannon Lake
Nearby Lakes in Big Stone County
Frequently asked questions about Lannon Lake
Where is Lannon Lake?
- Lannon Lake is a lake in Big Stone 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 Lannon Lake?
- Lannon Lake in Big Stone County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 113 acres.
Is Lannon Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lannon 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 Lannon 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