Cobb Lake Central Basin is a cold, clear oligotrophic lake in Barry County, Michigan. Water quality is graded A based on 2 sampling years through 2022. Overall water quality is declining over recent sampling years. Compared to the 13 other monitored lakes in Barry County, Cobb Lake Central Basin ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-22. Grade methodology: LakeGrade methodology.
Watch Cobb Lake Central Basin water quality
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 16 ft down. Chlorophyll-a: 1.8 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 1.8 µg/L | A |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Cobb Lake Central Basin
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Fishing Cobb Lake Central Basin
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.83 m/yr | 2 |
Water Temperature
Cobb Lake Central Basin averages about 67°F at the surface in summer, usually warmest in Aug (about 70°F) and coldest in May (about 57°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 1,321 field readings (2010–2022) via the EPA Water Quality Portal. See the full Cobb Lake Central Basin water temperature breakdown →
Location
County Ranking
Ranked #1 of 14 lakes in Barry County
Nearby Lakes in Barry County
Explore Cobb Lake Central Basin across LakeGrade
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Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
Low nutrients, clear water, excellent for swimming
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Other Grade A Lakes in Michigan
Allegan County · Clarity: 14 ft
Van Buren County · Clarity: 13 ft
Van Buren County · Clarity: 17 ft
Van Buren County · Clarity: 15 ft
St. Joseph County · Clarity: 10.5 ft
Montcalm County · Clarity: 16 ft
Oligotrophic Lakes in Michigan
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-22
Monitoring stations: 1