Ackerson Lake; Napoleon Twp is a mesotrophic lake in Jackson County, Michigan. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is declining over recent sampling years. Public access is available with 1 public boat landing. Compared to the 8 other monitored lakes in Jackson County, Ackerson Lake; Napoleon Twp ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-10. Grade methodology: LakeGrade methodology.
Watch Ackerson Lake; Napoleon Twp water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 12 ft. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Ackerson Lake; Napoleon Twp
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Fishing Ackerson Lake; Napoleon Twp
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -2 m/yr | 2 |
Recreation & Access
Location
County Ranking
Ranked #5 of 9 lakes in Jackson County
Cleaner Lakes Within 30 Miles
Ackerson Lake; Napoleon Twp holds Grade B. One nearby lake has a higher grade.
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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
4 EPA-permitted facilities operate within about 5 miles of Ackerson Lake; Napoleon Twp under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Gerdau Specialty Steel-JacksonJackson · 1.4 mi away · NPDES MI0028461Recent violation
- Adco Products IncMichigan Center · 4.6 mi away · NPDES MI0038601Recent violation
- Mich Center School DistMichigan Center · 3.3 mi away · NPDES MI0041998
- Admiral Petroleum-Sta 140Michigan Center · 3.7 mi away · NPDES MI0058176
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: 2023-09-10
Monitoring stations: 1