Cobb Lake
Barry County, Michigan92 acresView 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
Cobb Lake in Barry County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.5 ft visibility. Surface area: 92.3 acres.
- Clarity
- 14.5 ft
- Area
- 92 acres
- Trend
- ↑ Improving
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Stays near Cobb Lake
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Watch Cobb Lake’s letter
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Why Cobb Lake has no grade
Cobb Lake 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, Cobb Lake is Not Rated — not an F. Its 14.5-foot median from 93 readings collected 2016–2022 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 EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Cobb Lake is a 92-acre lake in Barry County, Michigan. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-22. Grade methodology: LakeQuality methodology.
What Cobb Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14.5 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Cobb Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 14.5 ft. TSI 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 92 acres |
No bathymetric survey has been published for Cobb Lake, so its depth is not documented here.
Fishing Cobb Lake
Water Quality Trend: ↑ Improving
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.313 m/yr | 8 |
| Phosphorus | → Stable | -0.08 µg/L/yr | 7 |
| Chlorophyll-a | → Stable | +0.01 µg/L/yr | 6 |
Graded lakes near Cobb Lake
Cobb Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Barry County
Frequently asked questions about Cobb Lake
Where is Cobb Lake?
- Cobb Lake is a lake in Barry County, Michigan. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Cobb Lake?
- Cobb Lake in Barry County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.5 ft visibility. Surface area: 92.3 acres.
Is Cobb Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
93 measurements from 1 monitoring station, 2016–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS93 samples · 2016–2022
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.