Round Lake Central Basin
Lenawee County, WisconsinOligotrophic
Round Lake Central Basin is a cold, clear oligotrophic lake in Lenawee County, MI. Water quality is graded A based on 2 sampling years through 2023. The lake supports 25 documented fish species including Blackchin shiner, Blacknose shiner, and Bluegill. Compared to the 7 other monitored lakes in Lenawee County, Round Lake Central Basin ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-18. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 12 ft. Chlorophyll-a: 2.3 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 2.3 µg/L | A |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Round Lake Central Basin (14-day solunar calendar)
→ Is it safe to eat fish from Round Lake Central Basin? (mercury & PFAS guide)
→ Round Lake Central Basin fishing regulations (limits, seasons, special rules)
Location
County Ranking
Ranked #3 of 8 lakes in Lenawee County
Nearby Lakes in Lenawee County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Mecosta County · Clarity: 12.8 ft
Benzie County · Clarity: 13.5 ft
Clare County · Clarity: 15 ft
Kalkaska County · Clarity: 16 ft
Gogebic County · Clarity: 18 ft
Iron County · Clarity: 16 ft
Oligotrophic Lakes in Wisconsin
EPA Impairment Status
Round Lake Central Basin 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 (2.97 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-09-18
Monitoring stations: 1