Cross Slough
Cross Slough in Mason County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 2776 acres.
- Area
- 2,776 acres
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Why Cross 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 Cross 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.
Cross Slough is a 2,776-acre lake in Mason County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Cross 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 Cross 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 Cross Slough
Compare lakeside cabins, hotels, and vacation rentals near Cross Slough in Mason 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 Cross Slough
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2,776 acres |
No bathymetric survey has been published for Cross Slough, so its depth is not documented here.
Fishing Cross Slough
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Frequently asked questions about Cross Slough
Where is Cross Slough?
- Cross Slough is a lake in Mason 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 Cross Slough?
- Cross Slough in Mason County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 2776 acres.
Is Cross Slough safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Cross 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 Cross Slough across LakeQuality
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Where this data comes from
Measurements for Cross Slough come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.