Posey Lake Central Basin; Hudson Township is a 150-acre productive, nutrient-rich eutrophic lake in Lenawee County, Michigan. Water quality is graded C based on 2 sampling years through 2023. Overall water quality is improving over recent sampling years. The lake supports 7 documented fish species including Bluegill, Common carp, and Golden redhorse. Public access is available. Compared to the 7 other monitored lakes in Lenawee County, Posey Lake Central Basin; Hudson Township ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-24. Grade methodology: LakeGrade methodology.
Watch Posey Lake Central Basin; Hudson Township water quality
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 5 ft. Chlorophyll-a: 8.6 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 8.6 µg/L | B |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 150 acres |
| Public Access | Yes |
Where to stay near Posey Lake Central Basin; Hudson Township
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Posey Lake Central Basin; Hudson Township
- → Posey Lake Central Basin; Hudson Township fishing forecast & best times (species outlook + 14-day solunar calendar)
- → Posey Lake Central Basin; Hudson Township fishing regulations (limits, seasons, special rules)
- → Is it safe to eat fish from Posey Lake Central Basin; Hudson Township? (mercury & PFAS guide)
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.295 m/yr | 3 |
| Chlorophyll-a | ↑ Improving | -3.7 µg/L/yr | 2 |
Location & Depth Map
Free interactive depth-contour map of Posey Lake Central Basin; Hudson Township, reaching a maximum surveyed depth of 45 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #7 of 8 lakes in Lenawee County
Cleaner Lakes Within 30 Miles
Posey Lake Central Basin; Hudson Township holds Grade C. 2 nearby lakes hold higher grades.
- ARound Lake Central BasinLenawee County · 4.8 mi · Two grade letters higher (C → A)
- ADevils Lake Central Basin NorthLenawee County · 6.3 mi · Two grade letters higher (C → A)
Nearby Lakes in Lenawee County
Explore Posey Lake Central Basin; Hudson Township across LakeGrade
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Fish species and best lakes in Lenawee County
Species activity outlook by water temperature and season
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Where to stay at Michigan's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade C Lakes in Michigan
Hillsdale County · Clarity: 9.5 ft
Jackson County · Clarity: 8 ft
Jackson County · Clarity: 7.5 ft
Washtenaw County · Clarity: 5.8 ft
Washtenaw County · Clarity: 7.2 ft
Washtenaw County · Clarity: 9.5 ft
Eutrophic Lakes in Michigan
More records, surveys & data sources
Reservoir Info (USACE NID)
Posey Lake Central Basin; Hudson Township is a man-made reservoir impounded by the Posey Lake Level Control Structure (completed 1955), built primarily for recreation on the Posey Lake Drain; gravity-type dam, 7 ft tall and 15 ft long.
- Surface area
- 150 ac
- Normal storage
- 190 ac-ft
- Max storage
- 715 ac-ft
- Drainage area
- 0 sq mi
- Hazard class
- Low
- Owner
- Lenawee County Drain Commissioner
Source: USACE National Inventory of Dams, NID ID MI02265 · Operator website · Matched by proximity (0.58 km)
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 Posey Lake Central Basin; Hudson Township under Clean Water Act (NPDES) discharge permits.
- Randy & Eric Bleich DairyHudson · 3.7 mi away · NPDES MIG440016
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: 2023-09-24
Monitoring stations: 1