Safest Lakes to Swim in Michigan
Windover Lake South Basin; Freeman Township (Clare County) ranks #1 for swimming in Michigan — grade A water with low algae and public access. Below: the top 25 lakes in Michiganthat pass our swim-safety filter (grade A/B, chlorophyll-a below 10 µg/L).
Best-for-swimming on LakeGrade weights water clarity heavily: a swimmer cares whether they can see their feet, whether the water looks inviting on a 90-degree July day, and whether there is a real harmful-algal-bloom risk. The top Michigan swimming lake on current data is Windover Lake South Basin; Freeman Township (A).
The swimming-best list filters more aggressively on chlorophyll-a than the cleanest list — even very clear lakes can have harmful-algal-bloom risk under specific conditions, so the swimming ranking is more conservative on that front.
| Rank | Lake | County | Grade | Swim Safety | Clarity | Algae | Phosphorus | Area |
|---|---|---|---|---|---|---|---|---|
| 1 | Windover Lake South Basin; Freeman Township | Clare | A | Low algae | 15 ft | 2.5 µg/L | — | - |
| 2 | Moon Lake Central Basin; Watersmeet Township | Gogebic | A | Low algae | 18 ft | 3.2 µg/L | — | - |
| 3 | Sunset Lake West Central Basin; Bates Township | Iron | A | Low algae | 15.5 ft | 2.2 µg/L | — | - |
| 4 | Ellen Lake South Central Basin; Mansfield Township | Iron | A | Low algae | 17 ft | 2.8 µg/L | — | - |
| 5 | Smoky Lake | Iron | A | Low algae | 24 ft | — | 8.3 µg/L | - |
| 6 | Whitefish Bay Deep Lake | Chippewa | A | Low algae | 34.4 ft | 2.5 µg/L | 16 µg/L | - |
| 7 | Little Bass Lake | Lake | A | Low algae | 18.3 ft | 3.1 µg/L | — | - |
| 8 | Whitefish Lake Southeast Basin; Pierson Township | Montcalm | A | Low algae | 16 ft | 3.4 µg/L | — | - |
| 9 | Cobb Lake Central Basin | Barry | A | Low algae | 16 ft | 1.8 µg/L | — | - |
| 10 | Big Twin Lake Southeast Basin; Blue Lake Township | Kalkaska | A | Low algae | 23 ft | 2.3 µg/L | — | - |
| 11 | Bills Lake Central Basin | Newaygo | A | Low algae | 15.5 ft | 1.7 µg/L | — | - |
| 12 | Arbutus Lake South Central Basin | Grand Traverse | A | Low algae | 19 ft | 2.1 µg/L | — | - |
| 13 | Cub Lake Central Basin | Kalkaska | A | Low algae | 19 ft | 1.7 µg/L | — | - |
| 14 | Lake Mary Northwest Basin; Mastodon Township | Iron | A | Low algae | 18 ft | 3 µg/L | — | - |
| 15 | Round Lake | Benzie | A | Low algae | 15 ft | 2.7 µg/L | — | - |
| 16 | Bear Lake Southeast Basin | Kalkaska | A | Low algae | 36.5 ft | 2.4 µg/L | — | - |
| 17 | Higgins Lake East Basin | Roscommon | A | Low algae | 35 ft | 1 µg/L | — | - |
| 18 | Long Lake North Central Basin; Long Lake Township | Grand Traverse | A | Low algae | 23.8 ft | 1.4 µg/L | — | - |
| 19 | Eagle Lake Central Basin; Blue Lake Township | Kalkaska | A | Low algae | 17 ft | 1.6 µg/L | — | - |
| 20 | Indian Lake Northeast Basin; Blue Lake Township | Kalkaska | A | Low algae | 15.5 ft | 4.3 µg/L | — | - |
| 21 | Beaver Lake Central Basin; Ossineke Township | Alpena | A | Low algae | 16 ft | 1.7 µg/L | — | - |
| 22 | Eagle Lake East Basin; Paw Paw Township | Van Buren | A | Low algae | 17 ft | 3.8 µg/L | — | - |
| 23 | Lake View; Almira Twp | Benzie | A | Low algae | 18 ft | 3 µg/L | — | - |
| 24 | Lower Herring Lake East Basin; Blaire Township | Benzie | A | Low algae | 16 ft | 2.4 µg/L | — | - |
| 25 | Twin Lakes; Grayling Twp | Crawford | A | Low algae | 19 ft | 4.5 µg/L | — | - |
Frequently Asked Questions
What is the best lake to swim in Michigan?
Windover Lake South Basin; Freeman Township in Clare County ranks #1 for swimming-safety in our 2026 Michigan dataset, combining grade-A water clarity with low algae and public access. The full top 25 above ranks the swim-safest lakes statewide.
How do you know if a lake is safe to swim in Michigan?
Three signals: (1) water clarity — Secchi depth above 6 feet is a strong sign of low suspended sediment and pathogens; (2) chlorophyll-a below 10 µg/L means low risk of harmful algae bloom; (3) a current grade of A or B from year-round sampling. Michigan DNR and county health departments post seasonal advisories — always check before you swim, especially in late summer when blue-green algae bloom risk peaks.
Are lakes in Michigan safe to swim in?
Most monitored Michigan lakes are safe to swim in under normal conditions, but water quality varies widely. The lakes ranked above are filtered to grade A and B with chlorophyll-a below 10 µg/L — meaning they consistently test cleaner and have lower algae bloom risk than the state average. Always check posted advisories before swimming and avoid water after heavy rain (bacterial contamination spikes from runoff).
What lakes have algae blooms in Michigan?
Algae blooms (especially blue-green / cyanobacteria) are most common in shallow, warm, nutrient-rich (eutrophic) lakes during late summer. Lakes with high phosphorus and chlorophyll-a measurements are at higher risk. The lakes on this page are filtered to exclude high-algae lakes. For the opposite list, see our most-polluted-lakes trend page.
When is it safe to swim in lakes in Michigan?
Michigan lakes are typically safest to swim in late spring through early summer (May–July), when water is cool and algae bloom risk is lowest. Risk rises in late summer and early fall (August–September) when warm water and accumulated nutrients drive cyanobacteria blooms. Always avoid swimming after heavy rainfall (bacterial spikes from runoff) and check current state DNR advisories the day you go.
What's the cleanest lake in Michigan?
The single cleanest lake by combined water-quality score is featured on the Michigan cleanest-lakes page. The lakes here are filtered specifically for swimming safety — same A/B grade requirement, plus low chlorophyll-a (active algae filter). For the broader cleanliness ranking, see /best/cleanest/mi.
Our swimming-safety filter
We don't just rank by overall grade. Lakes here have to pass three filters:
- Grade A or B overall water quality (top 40% statewide)
- Chlorophyll-a below 10 µg/L — actively low algae density, low risk of harmful blue-green blooms
- Multi-year sampling data — excludes lakes with limited sampling history (data confidence)
The Swim Safety column adds a direct bacteria signal on top of the grade: where the EPA Water Quality Portal has enough E. coli or fecal-coliform samples, we show a historical swim-safety grade (how often the lake has exceeded the safe-swimming threshold). It is a record of past testing, never a live "safe today" reading — bacteria spike fast after rain.
The ranking within the filter is by combined water-quality score (Secchi clarity + phosphorus + chlorophyll-a). Always check current Michigan DNR advisories before swimming.
Where to swim near a Michigan city
Looking for a lake close to home? These pages rank the safest swim lakes within driving distance of Michigan's largest cities.
Where to stay near Michigan swimming lakes
Book a cabin, resort, or rental near Michigan's cleanest swim lakes — live availability and prices for your beach weekend.
Top-rated places to stay near Michigan swim lakes
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Source: EPA National Aquatic Resource Surveys, 2026.