Sherman Park Lagoon 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.
- Impaired · Cause unknown
- Limited data
Sherman Park Lagoon Lake in Cook County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar.
- Typical in August
- 75°F
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Stays near Sherman Park Lagoon Lake
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Watch Sherman Park Lagoon Lake’s letter
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Why Sherman Park Lagoon 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 Sherman Park Lagoon 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.
Sherman Park Lagoon Lake is a lake in Cook County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2023-05-10. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Sherman Park Lagoon Lake is listed impaired under Clean Water Act §303(d) (IR 5) for cause unknown, mercury. Check local advisories before you swim.
Water quality measurements for Sherman Park Lagoon 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 |
Water Temperature
Sherman Park Lagoon Lake typically sits around 75°F at the surface in August. Summer average is about 76°F. 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 →
Fishing Sherman Park Lagoon Lake
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)
Nearby Lakes in Cook County
Frequently asked questions about Sherman Park Lagoon Lake
Where is Sherman Park Lagoon Lake?
- Sherman Park Lagoon 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 Sherman Park Lagoon Lake?
- Sherman Park Lagoon Lake in Cook County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Sherman Park Lagoon Lake safe to swim in?
- The letter is not a swimming clearance. Sherman Park Lagoon Lake is listed impaired under Clean Water Act §303(d) (IR 5) for cause unknown, mercury. Check local advisories before you swim.
What is the water temperature of Sherman Park Lagoon Lake?
- Sherman Park Lagoon Lake typically sits around 75°F at the surface in August, from 40 EPA Water Quality Portal field readings (2014–2023). That is a typical value for the month, not a live reading.
Explore Sherman Park Lagoon Lake across LakeQuality
Planning a trip around Indiana Dunes?
Sherman Park Lagoon Lake is about 31 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, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Illinois Water Science Center
USGS-IL1 sample · 2023
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
Impairment status from EPA ATTAINS 303(d) database