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LakeQuality
D

Round Lake

Shiawassee County, WisconsinLimited DataEutrophic

Round Lake is a productive, nutrient-rich eutrophic lake in Shiawassee County, MI. Water quality is graded D based on 1 sampling years through 2022. 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, local state DNR records, last sampled 2022-09-14. Grade methodology: LakeGrade methodology.

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.

MetricValueGrade
Water Clarity (Secchi Depth)6.5 ftD
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)50Eutrophic

High nutrients, frequent algae, reduced clarity

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Round Lake (14-day solunar calendar)

→ Is it safe to eat fish from Round Lake? (mercury & PFAS guide)

Round Lake fishing regulations (limits, seasons, special rules)

Location

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County Ranking

Ranked #6 of 6 lakes in Shiawassee County

Cleaner Lakes Within 30 Miles

Round Lake holds Grade D. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Shiawassee County

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

Oxygen depletion (low DO)

Source: EPA ATTAINS assessment unit MI040802030205-05 · Official waterbody report · Matched by proximity (0.8 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: 2022-09-14

Monitoring stations: 1