Round Lake is a productive, nutrient-rich eutrophic lake in Shiawassee County, Michigan. Water quality is graded D based on 1 sampling years through 2022. Overall water quality is improving over recent sampling years. The lake supports 37 documented fish species including Black bullhead, Black crappie, and Blackchin shiner. Compared to the 5 other monitored lakes in Shiawassee County, Round Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-14. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 6.5 ft. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.5 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Round Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Round 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 #6 of 6 lakes in Shiawassee County
Cleaner Lakes Within 30 Miles
Round Lake holds Grade D. 2 nearby lakes hold higher grades.
Nearby Lakes in Shiawassee County
Explore Round 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
High nutrients, frequent algae, reduced clarity
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More Michigan Lake Rankings
Other Grade D Lakes in Michigan
Eutrophic Lakes in Michigan
More records, surveys & data sources
EPA Impairment Status
Round 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 · Matched by proximity (0.8 km)
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