Round Lake
Shiawassee County, Michigan11 acresView mapDirections
Nutrients and algae run above the regional average.
- Eutrophic
- Impaired · Oxygen depletion (low DO)
- #4 of 4 in the county
Round Lake in Shiawassee County, Michigan has a water quality grade of D (Nutrient-rich). Water clarity: 6 ft visibility. Phosphorus: 32 µg/L. Chlorophyll-a (algae): 19 µg/L. Surface area: 11.2 acres.
- Clarity
- 6 ft
- Area
- 11 acres
- Type
- Eutrophic
- Phosphorus
- 32 µg/L
- Chlorophyll-a
- 19 µg/L
- Trend
- ↓ Declining
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Stays 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Round Lake are listed below.
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Watch Round Lake’s letter
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Round Lake is a 11-acre productive, nutrient-rich eutrophic lake in Shiawassee County, Michigan. Water quality is graded D based on 2 sampling years through 2023. Overall water quality is declining over recent sampling years. The lake supports 37 documented fish species including Black bullhead, Black crappie, and Blackchin shiner. Compared to the 3 other monitored lakes in Shiawassee County, Round Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-15. Grade methodology: LakeQuality methodology.
What Round Lake is good for
From access and monitoring records, not editorial picks.
- Fishing37 species recorded
Swimming Safety
Grade onlyAlgae risk
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The D is nutrients and algae, not a swimming clearance. Round Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Murky, only visible to about 6 ft. Phosphorus 32 µg/L. Chlorophyll-a 19 µg/L. TSI 55. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | Not graded |
| Phosphorus | 32 µg/L | Fair |
| Chlorophyll-a (Algae) | 19 µg/L | Poor |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 11 acres |
No bathymetric survey has been published for Round Lake, so its depth is not documented here.
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Round Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.126 m/yr | 5 |
| Phosphorus | ↓ Declining | +4.88 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +1.84 µg/L/yr | 4 |
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
Source: EPA ATTAINS assessment unit MI040802030205-05 · Official waterbody report · Matched by proximity (0.85 km)
County Ranking
Ranked #4 of 4 lakes in Shiawassee County
Nearby Lakes in Shiawassee County
Frequently asked questions about Round Lake
Where is Round Lake?
- Round Lake is a lake in Shiawassee County, Michigan. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Round Lake?
- Round Lake in Shiawassee County, Michigan has a water quality grade of D (Nutrient-rich). Water clarity: 6 ft visibility. Phosphorus: 32 µg/L. Chlorophyll-a (algae): 19 µg/L. Surface area: 11.2 acres.
Is Round Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Round Lake is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
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.
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Where this data comes from
76 measurements from 1 monitoring station, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS76 samples · 2021–2023
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database