Sherman Park Lagoon Lake is a highly nutrient-loaded hypereutrophic lake in Cook County, Illinois. Water quality is graded F based on 1 sampling years through 2023. Compared to the 67 other monitored lakes in Cook County, Sherman Park Lagoon Lake ranks #53 for water quality.
Source: EPA Water Quality Portal sampling records, Illinois DNR, last sampled 2023-05-10. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.3 ft of visibility. Trophic State Index: 73.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Sherman Park Lagoon Lake
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Fishing Sherman Park Lagoon Lake
Water Temperature
Sherman Park Lagoon Lake averages about 76°F at the surface in summer, usually warmest in Jun (about 78°F) and coldest in Oct (about 57°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 40 field readings (2014–2023) via the EPA Water Quality Portal. See the full Sherman Park Lagoon Lake water temperature breakdown →
Location
County Ranking
Ranked #53 of 68 lakes in Cook County
Nearby Lakes in Cook County
Explore Sherman Park Lagoon Lake across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Illinois's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
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More records, surveys & data sources
EPA Impairment Status
Sherman Park Lagoon Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit IL_RHU · Official waterbody report · Matched by proximity (0 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-05-10
Monitoring stations: 1