Sag Quarry East Lake is a productive, nutrient-rich eutrophic lake in Cook County, Illinois. Water quality is graded C based on 2 sampling years through 2021. Compared to the 67 other monitored lakes in Cook County, Sag Quarry East Lake ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, Illinois DNR, last sampled 2021-10-26. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 5.4 ft. Phosphorus level: 30.5 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.4 ft | D |
| Phosphorus | 30.5 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Sag Quarry East Lake
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Top-rated places to stay near Sag Quarry East Lake
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Fishing Sag Quarry East Lake
Water Temperature
Sag Quarry East Lake averages about 69°F at the surface in summer, usually warmest in Jun (about 71°F) and coldest in Oct (about 53°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 35 field readings (2021–2023) via the EPA Water Quality Portal. See the full Sag Quarry East Lake water temperature breakdown →
Location
County Ranking
Ranked #12 of 68 lakes in Cook County
Nearby Lakes in Cook County
Explore Sag Quarry East Lake across LakeGrade
More Illinois Lake Rankings
Other Grade C Lakes in Illinois
Eutrophic Lakes in Illinois
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2021-10-26
Monitoring stations: 2