Green Lake is a mesotrophic lake in Allegan County, Michigan. Water quality is graded C based on 1 sampling years through 2022. Overall water quality is declining over recent sampling years. The lake supports 20 documented fish species including Bigmouth shiner, Black crappie, and Blackchin shiner. Public access is available with 1 public boat landing. Compared to the 11 other monitored lakes in Allegan County, Green Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-06. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 8 ft. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Green Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Green Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -11.38 m/yr | 2 |
Recreation & Access
Location & Depth Map
Free interactive depth-contour map of Green Lake, reaching a maximum surveyed depth of 60 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #9 of 12 lakes in Allegan County
Cleaner Lakes Within 30 Miles
Green Lake holds Grade C. One nearby lake has a higher grade.
Nearby Lakes in Allegan County
Explore Green Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Allegan County
Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
Moderate nutrients, good water quality
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Other Grade C Lakes in Michigan
Mesotrophic 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.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Green Lake under Clean Water Act (NPDES) discharge permits.
- Kent County Road CommissionCaledonia · 4.8 mi away · NPDES MIG080050
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2022-09-06
Monitoring stations: 1