Aginaw Lake is a mesotrophic lake in Shiawassee County, Michigan. Water quality is graded C based on 1 sampling years through 2022. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 5 other monitored lakes in Shiawassee County, Aginaw Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-14. Grade methodology: LakeGrade methodology.
Watch Aginaw Lake 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 Aginaw Lake
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Top-rated places to stay near Aginaw Lake
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Fishing Aginaw Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.625 m/yr | 3 |
| Chlorophyll-a | ↑ Improving | -4.25 µg/L/yr | 3 |
Location
County Ranking
Ranked #1 of 6 lakes in Shiawassee County
Nearby Lakes in Shiawassee County
Explore Aginaw Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Shiawassee 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
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade C Lakes in Michigan
Genesee County · Clarity: 9 ft
Livingston County · Clarity: 9.5 ft
Livingston County · Clarity: 5.5 ft
Livingston County · Clarity: 9.5 ft
Clinton County · Clarity: 9 ft
Clinton County · Clarity: 9 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
EPA Impairment Status
Aginaw Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MI040802030205-05 · Official waterbody report
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-14
Monitoring stations: 1