What is the water quality grade for Round Lake?

Round Lake in Shiawassee County, Michigan received a water quality grade of C (Fair). Water clarity: 6 ft visibility. Chlorophyll-a (algae): 19 µg/L.

Is Round Lake safe to swim in?

Swim with caution, moderate algae may be present. Round Lake has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 19 µg/L. Always check local health department advisories before swimming.

What fish are in Round Lake?

Fish species found in Round Lake include Black bullhead, Black crappie, Blackchin shiner, Blacknose shiner, Bluegill, Bluntnose minnow, Brassy minnow, Brook silverside, Brook stickleback, Central mudminnow, Common shiner, Fathead minnow, Golden shiner, Grass pickerel, Green sunfish, Iowa darter, Johnny darter, Lake chubsucker, Largemouth bass, Longnose gar, Muskellunge, Northern logperch, Northern longear sunfish, Northern pike, Pumpkinseed, Redear sunfish, Rock bass, Rosyface shiner, Smallmouth bass, Spotfin shiner, Spottail shiner, Spotted gar, Tadpole madtom, Western banded killifish, White sucker, Yellow bullhead, Yellow perch. Round Lake is located in Shiawassee County, Michigan.

Shiawassee County, Michigan · 42.82°N

Round Lake

Grade CFair · 6 ft clarity

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Eutrophic

Round Lake is a productive, nutrient-rich eutrophic lake in Shiawassee County, Michigan. Water quality is graded C based on 2 sampling years through 2023. 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 #4 for water quality.

Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2023-09-15. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swim with caution, moderate algae may be present

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Water Quality Grade: C, Fair

Murky, only visible to about 6 ft. Chlorophyll-a: 19 µg/L. Trophic State Index: 55.

Metric	Value	Grade
Water Clarity (Secchi Depth)	6 ft	D
Phosphorus	No data
Chlorophyll-a (Algae)	19 µg/L	C
Trophic State Index (TSI)	55	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Round Lake

Compare lakeside cabins, hotels, and vacation rentals near Round Lake in Shiawassee County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

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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

Water Temperature

Round Lake averages about 60°F at the surface in summer, usually warmest in Aug (about 62°F) and coldest in May (about 53°F). These are typical values by month — not a live reading.