Aginaw Lake
Shiawassee County, Michigan68 acresView mapDirections
EGLE publishes the water-quality measurements for Aginaw Lake. Here is what has been measured.
- Impaired · Oxygen depletion (low DO)
- Limited data
Aginaw Lake in Shiawassee County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 8 ft visibility. Surface area: 68.4 acres.
Aginaw Lake is a 68-acre lake in Shiawassee County, Michigan. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-14. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Aginaw Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
Whether Aginaw Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Aginaw Lake
These are the measurements EGLE publishes for Aginaw Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 8 ft. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Aginaw Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
68 acres
No bathymetric survey has been published for Aginaw Lake, so its depth is not documented here.
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Fishing Aginaw Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2018–2023).
Water clarity
Improving5 years
Phosphorus
Worsening+4.88 µg/L/yr5 years
Chlorophyll-a
Worsening+1.84 µg/L/yr4 years
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
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit MI040802030205-05 · Official waterbody report
Nearby Lakes in Shiawassee County
Frequently asked questions about Aginaw Lake
Where is Aginaw Lake?
- Aginaw Lake is a lake in Shiawassee County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Aginaw Lake?
- Aginaw Lake in Shiawassee County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 8 ft visibility. Surface area: 68.4 acres.
Is Aginaw Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Aginaw Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
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Where this data comes from
72 measurements from 1 monitoring station, 2018–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS72 samples · 2018–2022
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database