Belly Deep Slough Lake
Cook County, IllinoisView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Belly Deep Slough Lake in Cook County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar.
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Stays near Belly Deep Slough Lake
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Watch Belly Deep Slough Lake’s letter
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Why Belly Deep Slough 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 Belly Deep Slough Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
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.
Belly Deep Slough Lake is a lake in Cook County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2022-03-22. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Belly Deep Slough Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Fishing Belly Deep Slough Lake
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Belly Deep Slough Lake under Clean Water Act (NPDES) discharge permits. 3 facilities have a reported Clean Water Act violation in the past three years.
- Vcna Prairie LlcBridgeview · 3.3 mi away · NPDES IL0078590Recent violation
- Westlake Epoxy, IncBedford Park · 3.7 mi away · NPDES IL0075205Recent violation
- Ingredion Incorporated Argo PlantBedford Park · 4.6 mi away · NPDES IL0041009Recent violation
- Mccook ResevoirWillow Springs · 3 mi away · NPDES IL0079138
- Golden Grain Co-BridgeviewBridgeview · 4.1 mi away · NPDES IL0073342
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Belly Deep Slough Lake
Belly Deep Slough Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Cook County
Frequently asked questions about Belly Deep Slough Lake
Where is Belly Deep Slough Lake?
- Belly Deep Slough Lake is a lake in Cook County, Illinois. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Belly Deep Slough Lake?
- Belly Deep Slough Lake in Cook County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Belly Deep Slough Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Belly Deep Slough Lake across LakeQuality
Planning a trip around Indiana Dunes?
Belly Deep Slough Lake is about 39 miles from Indiana Dunes National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Indiana Dunes →More Illinois Lake Rankings
Other Lakes in Illinois
Where this data comes from
1 measurement from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Illinois Water Science Center
USGS-IL1 sample · 2022
Analytical methods
- Secchi disk method
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)