Swamp Slough
Swamp Slough in Cass County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 32 acres.
- Area
- 32 acres
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Why Swamp 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 Swamp 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 Illinois EPA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Swamp Slough is a 32-acre lake in Cass County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, 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 Swamp 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 Swamp Slough
Compare lakeside cabins, hotels, and vacation rentals near Swamp Slough in Cass County, Illinois — 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 Swamp Slough
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 32 acres |
No bathymetric survey has been published for Swamp Slough, so its depth is not documented here.
Fishing Swamp Slough
Nearby Lakes in Cass County
Frequently asked questions about Swamp Slough
Where is Swamp Slough?
- Swamp Slough is a lake in Cass County, Illinois. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Swamp Slough?
- Swamp Slough in Cass County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 32 acres.
Is Swamp Slough safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Swamp 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 Swamp Slough across LakeQuality
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Where this data comes from
Measurements for Swamp Slough come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.