Fourth Lake
Fourth Lake in Lake County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 297 acres.
- Area
- 297 acres
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Why Fourth 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 Fourth Lake, no water-quality sampling on record for this lake.
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.
Fourth Lake is a 297-acre lake in Lake County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled recent years. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Fourth Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Fourth Lake
Compare lakeside cabins, hotels, and vacation rentals near Fourth Lake in Lake County, Illinois — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Fourth Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 297 acres |
No bathymetric survey has been published for Fourth Lake, so its depth is not documented here.
Fishing Fourth Lake
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Frequently asked questions about Fourth Lake
Where is Fourth Lake?
- Fourth Lake is a lake in Lake County, Illinois. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Fourth Lake?
- Fourth Lake in Lake County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 297 acres.
Is Fourth Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Fourth Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Fourth Lake across LakeQuality
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Where this data comes from
Measurements for Fourth Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.