Round Lake is a mesotrophic lake in Lenawee County, Michigan. Water quality is graded B based on 1 sampling years through 2022. Water clarity is improving over recent sampling years. The lake supports 23 documented fish species including Blackchin shiner, Blacknose shiner, and Bluegill. Compared to the 7 other monitored lakes in Lenawee County, Round Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-08-18. Grade methodology: LakeGrade methodology.
Watch Round Lake 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 12.5 ft. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.5 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 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: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +4.02 m/yr | 2 |
| Chlorophyll-a | ↓ Declining | +0.2 µg/L/yr | 3 |
Location & Depth Map
Free interactive depth-contour map of Round Lake, reaching a maximum surveyed depth of 67 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #6 of 8 lakes in Lenawee County
Cleaner Lakes Within 30 Miles
Round Lake holds Grade B. 3 nearby lakes hold higher grades.
Nearby Lakes in Lenawee County
Explore Round Lake 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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Moderate nutrients, good water quality
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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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI041000060101-02 · Official waterbody report · Matched by proximity (2.64 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: 2022-08-18
Monitoring stations: 1