What is the water quality grade for Round Lake Central Basin?

Round Lake Central Basin in Lenawee County, Michigan received a water quality grade of A (Excellent). Water clarity: 12 ft visibility. Chlorophyll-a (algae): 2.3 µg/L.

Is Round Lake Central Basin safe to swim in?

Excellent for swimming, crystal clear water with minimal algae. Round Lake Central Basin has an overall water quality grade of A. Algae concentration (chlorophyll-a) is 2.3 µg/L. Always check local health department advisories before swimming.

What fish are in Round Lake Central Basin?

Fish species found in Round Lake Central Basin include Blackchin shiner, Blacknose shiner, Bluegill, Bluntnose minnow, Brook silverside, Brook stickleback, Creek chub, Golden shiner, Grass pickerel, Iowa darter, Johnny darter, Lake chubsucker, Largemouth bass, Longnose gar, Northern longear sunfish, Pumpkinseed, Rock bass, Smallmouth bass, Spotfin shiner, Spottail shiner, Tadpole madtom, Western banded killifish, White bass, Yellow bullhead, Yellow perch. Round Lake Central Basin is located in Lenawee County, Michigan.

Lenawee County, Michigan

Round Lake Central Basin

Grade AExcellent · 12 ft clarity

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Oligotrophic

Round Lake Central Basin is a cold, clear oligotrophic lake in Lenawee County, Michigan. Water quality is graded A based on 2 sampling years through 2023. Water clarity is improving over recent sampling years. The lake supports 25 documented fish species including Blackchin shiner, Blacknose shiner, and Bluegill. Public access is available. 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, Michigan DNR, last sampled 2023-09-18. Grade methodology: LakeGrade methodology.

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

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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

Where to stay near Round Lake Central Basin

Compare lakeside cabins, hotels, and vacation rentals near Round Lake Central Basin in Lenawee 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 Central Basin

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

Water Temperature

Round Lake Central Basin averages about 61°F at the surface in summer, usually warmest in Jul (about 62°F) and coldest in Mar (about 42°F). These are typical values by month — not a live reading.