Great Lakes Quarries East
Cook County, IllinoisView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Limited data
Great Lakes Quarries East in Cook County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.5 ft visibility.
- Clarity
- 4.5 ft
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Stays near Great Lakes Quarries East
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Watch Great Lakes Quarries East’s letter
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Why Great Lakes Quarries East has no grade
Great Lakes Quarries East has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Great Lakes Quarries East is Not Rated — not an F. Its 4.5-foot median from 1 readings collected 2022 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. 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.
Great Lakes Quarries East is a lake in Cook County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2022-09-09. 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 Great Lakes Quarries East
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 4.5 ft. TSI 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Great Lakes Quarries East
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Great Lakes Quarries East under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- Argonne National LaboratoryArgonne · 1.6 mi away · NPDES IL0034592MajorRecent violation
- Nicor GasLemont · 1 mi away · NPDES IL0079928
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 Great Lakes Quarries East
Great Lakes Quarries East has no grade, but these lakes within a short drive do.
Nearby Lakes in Cook County
Frequently asked questions about Great Lakes Quarries East
Where is Great Lakes Quarries East?
- Great Lakes Quarries East 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 Great Lakes Quarries East?
- Great Lakes Quarries East in Cook County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.5 ft visibility.
Is Great Lakes Quarries East safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Great Lakes Quarries East across LakeQuality
More Illinois Lake Rankings
Other Lakes in Illinois
Eutrophic 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)