Cottonwood Slough
Cottonwood Slough in Codington County, South Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 188 acres.
- Area
- 188 acres
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Why Cottonwood Slough 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 Cottonwood Slough, 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.
Cottonwood Slough is a 188-acre lake in Codington County, South Dakota.
Source: EPA Water Quality Portal sampling records, SD DANR, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Cottonwood Slough 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 Cottonwood Slough
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 Cottonwood Slough
Compare lakeside cabins, hotels, and vacation rentals near Cottonwood Slough in Codington 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 Cottonwood Slough
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 188 acres |
No bathymetric survey has been published for Cottonwood Slough, so its depth is not documented here.
Fishing Cottonwood Slough
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Frequently asked questions about Cottonwood Slough
Where is Cottonwood Slough?
- Cottonwood Slough is a lake in Codington 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 Cottonwood Slough?
- Cottonwood Slough in Codington County, South Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 188 acres.
Is Cottonwood Slough safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Cottonwood Slough is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Cottonwood Slough across LakeQuality
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Where this data comes from
Measurements for Cottonwood Slough come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.