Round Lake
Lenawee County, Michigan507 acresView mapDirections
EGLE publishes the water-quality measurements for Round Lake. Here is what has been measured.
- Oligotrophic
- 67 ft max depth
Round Lake in Lenawee County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 12.3 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2 µg/L. Maximum depth: 67 ft. Surface area: 507.3 acres.
Round Lake is a 507-acre cold, clear oligotrophic lake in Lenawee County, Michigan with a maximum depth of 67 feet. Overall water quality is declining over recent sampling years. The lake supports 25 documented fish species including Blackchin shiner, Blacknose shiner, and Bluegill. Compared to the 4 other monitored lakes in Lenawee County, Round Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-18. Methodology: how these readings are compared.
What Round Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12.3 ft of visibility
- Fishing25 species recorded
- Deep water67 ft surveyed max depth
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Round Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Round Lake
These are the measurements EGLE publishes for Round Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 12.3 ft. Phosphorus 8 µg/L. Chlorophyll-a 2 µg/L. TSI 38.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 12.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 8µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 38 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Round Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Round Lake typically sits around 60°F at the surface in September. Summer average is about 61°F. Usually warmest in Jul (about 62°F) and coldest in Mar (about 42°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (42°F) to its warmest (62°F).
Typical surface water temperature by month, from 1,397 field readings (2010–2023) via the EPA Water Quality Portal. See the full Round Lake water temperature breakdown →
Lake Details
Max depth
67 ft
Surface area
507 acres
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Fish Species
Click a species to see every lake where it is documented.
Fishing Round Lake
Water Quality Trend: Worsening
Based on 7 years of monitoring (2016–2023).
Water clarity
Improving4 years
Phosphorus
Worsening+0.4 µg/L/yr7 years
Chlorophyll-a
Worsening+0.11 µg/L/yr7 years
Nearby Lakes in Lenawee County
Frequently asked questions about Round Lake
Where is Round Lake?
- Round Lake is a lake in Lenawee County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Round Lake?
- Round Lake in Lenawee County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 12.3 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2 µg/L. Maximum depth: 67 ft. Surface area: 507.3 acres.
Is Round Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Round Lake?
- Round Lake typically sits around 60°F at the surface in September, from 1,397 EPA Water Quality Portal field readings (2010–2023). That is a typical value for the month, not a live reading.
How deep is Round Lake?
- Round Lake has a maximum depth of 67 feet. The lake covers 507.3 acres.
What fish are in Round Lake?
- Fish species found in Round Lake 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 is located in Lenawee County, Michigan.
Explore Round Lake across LakeQuality
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Where this data comes from
69 measurements from 1 monitoring station, 2016–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS69 samples · 2016–2023
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.