Green Lake Southwest Basin; Leighton Township 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 22 documented fish species including Bigmouth shiner, Black crappie, and Blackchin shiner. Compared to the 11 other monitored lakes in Allegan County, Green Lake Southwest Basin; Leighton Township ranks #10 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-06. Grade methodology: LakeGrade methodology.
Watch Green Lake Southwest Basin; Leighton Township water quality
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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 Southwest Basin; Leighton Township
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Green Lake Southwest Basin; Leighton Township
- → Green Lake Southwest Basin; Leighton Township fishing forecast & best times (species outlook + 14-day solunar calendar)
- → Green Lake Southwest Basin; Leighton Township fishing regulations (limits, seasons, special rules)
- → Is it safe to eat fish from Green Lake Southwest Basin; Leighton Township? (mercury & PFAS guide)
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 |
Location
County Ranking
Ranked #10 of 12 lakes in Allegan County
Cleaner Lakes Within 30 Miles
Green Lake Southwest Basin; Leighton Township holds Grade C. One nearby lake has a higher grade.
Nearby Lakes in Allegan County
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Moderate nutrients, good water quality
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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
6 EPA-permitted facilities operate within about 5 miles of Green Lake Southwest Basin; Leighton Township under Clean Water Act (NPDES) discharge permits. 3 facilities have a reported Clean Water Act violation in the past three years.
- Leighton Twp-Green Lake WwslCaledonia · 1.3 mi away · NPDES MI0043125Recent violation
- Moline WwtpWayland · 2.9 mi away · NPDES MI0055107Recent violation
- Walnutdale Farms Inc.Wayland · 4.5 mi away · NPDES MIA000004Recent violation
- Moline WwslMoline · 2.6 mi away · NPDES MIG580102
- Speedway Superamerica LlcKentwood · 2.8 mi away · NPDES MIG080640
- Walnutdale Farms IncorporatedWayland · 4.5 mi away · NPDES MIG440001
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
Most recent sample: 2022-09-06
Monitoring stations: 1