Lynn Lake
Lynn Lake in Day County, South Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 57 acres.
- Area
- 57 acres
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Why Lynn 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 Lynn 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 SD DANR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lynn Lake is a 57-acre lake in Day County, South Dakota.
Source: EPA Water Quality Portal sampling records, SD DANR, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lynn Lake water quality
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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 Lynn 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 Lynn Lake
Compare lakeside cabins, hotels, and vacation rentals near Lynn Lake in Day County, South Dakota — 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 Lynn Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 57 acres |
No bathymetric survey has been published for Lynn Lake, so its depth is not documented here.
Fishing Lynn Lake
Nearby Lakes in Day County
Frequently asked questions about Lynn Lake
Where is Lynn Lake?
- Lynn Lake is a lake in Day County, South Dakota. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lynn Lake?
- Lynn Lake in Day County, South Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 57 acres.
Is Lynn Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lynn Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lynn Lake across LakeQuality
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Where this data comes from
Measurements for Lynn Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.