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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.

MetricValueGrade
Water Clarity (Secchi Depth)12 ftB
PhosphorusNo data
Chlorophyll-a (Algae)2.3 µg/LA
Trophic State Index (TSI)40Oligotrophic

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

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County Ranking

Ranked #3 of 8 lakes in Lenawee County

Nearby Lakes in Lenawee County

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

Mercury

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