Best Swimming Lakes in Alabama: Clearest Water, Lowest Algae (2026)

Swimming-friendly is a clarity-plus-algae problem: clear water and a low chlorophyll-a number. Smiw Lake tops the Alabama list on those combined measures.

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	Advisories & bacteria	Clarity	Algae	Phosphorus	Area
1	Smiw Lake	Winston	Low algae	11.5 ft	2.7 µg/L	8 µg/L	-
2	Lake Andrews	Houston	Low algae	5.9 ft	6.2 µg/L	25 µg/L	1,540 acres
3	Tust Lake	Tuscaloosa	Low algae	7.7 ft	5.3 µg/L	12 µg/L	-
4	Inlb Lake	Blount	Low algae	11.9 ft	2.8 µg/L	12 µg/L	-
5	Thue Lake	Elmore	Low algae	5.8 ft	2.7 µg/L	9 µg/L	574 acres
6	Clam Lake	Wilcox	Low algae	3 ft	6.1 µg/L	26 µg/L	-
7	Clam Lake	Monroe	Low algae	3 ft	6.1 µg/L	32.5 µg/L	5,850 acres
8	Mare Lake	Elmore	Low algae	10.6 ft	4.5 µg/L	8 µg/L	-
9	Mare Lake	Randolph	Low algae	11.5 ft	5.3 µg/L	12 µg/L	10,661 acres
10	Yate Lake	Tallapoosa	Low algae	4.7 ft	3.2 µg/L	9 µg/L	2,000 acres
11	Yate Lake	Tallapoosa	Low algae	7.4 ft	1.1 µg/L	7 µg/L	40,000 acres
12	Bclm Lake	Mobile	Low algae	6.9 ft	1.2 µg/L	28 µg/L	-
13	Shlb Lake	Baldwin	Low algae	4.4 ft	1.1 µg/L	32.5 µg/L	-
14	Olit Lake	Tuscaloosa	Low algae	4.3 ft	7.5 µg/L	19 µg/L	-
15	Ptac Lake	Covington	Low algae	3.6 ft	7.5 µg/L	18 µg/L	700 acres
16	Fjac Lake	Covington	Low algae	3.9 ft	8.5 µg/L	14 µg/L	-
17	Danw Lake	Dallas	Low algae	3.1 ft	7.1 µg/L	31 µg/L	-
18	Danw Lake	Wilcox	Low algae	2.9 ft	7.5 µg/L	23 µg/L	17,200 acres
19	Danw Lake	Wilcox	Low algae	2.9 ft	8.7 µg/L	27 µg/L	-
20	Danw Lake	Dallas	Low algae	3 ft	8.9 µg/L	30 µg/L	-
21	Wdfa Lake	Montgomery	Low algae	3.7 ft	8 µg/L	24 µg/L	-
22	Wdfa Lake	Lowndes	Low algae	3.3 ft	9.1 µg/L	34 µg/L	12,300 acres

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All-states list →Minnesota version →Wisconsin version →Illinois version →Cleanest lakes in Alabama →Swimming safety guide →Algae bloom guide →

Frequently Asked Questions

What is the best lake to swim in Alabama?

Smiw Lake in Winston County ranks first for swimming in the 2026 Alabama sampling record, combining the clearest water with low algae and public access. The full top 25 above is ranked the same way.

How do you know if a lake is safe to swim in Alabama?

That is a call for ADEM and county health departments, who post seasonal and same-day advisories — always check before you swim, especially in late summer when blue-green algae bloom risk peaks. The readings on this page show what past sampling found: Secchi depth above 6 feet is a strong sign of low suspended sediment, and chlorophyll-a below 10 µg/L means a low algae load. Neither is a clearance.

Are lakes in Alabama safe to swim in?

Whether a given lake is safe to swim in on a given day is answered by ADEM and the county health department, not by a water-quality reading. The lakes ranked above are filtered to the clearest, lowest-nutrient readings in the sampling record with chlorophyll-a below 10 µg/L, which means they have tested cleaner and carried less algae than the state average. Always check posted advisories before swimming and avoid water after heavy rain, when bacteria spikes from runoff.

What lakes have algae blooms in Alabama?

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; each lake page shows its own phosphorus and chlorophyll-a readings.

When is it safe to swim in lakes in Alabama?

Algae load in Alabama lakes is typically lowest from late spring through early summer (May–July), when water is cool. It rises in late summer and early fall (August–September) when warm water and accumulated nutrients drive cyanobacteria blooms. Avoid swimming after heavy rainfall, when bacteria spikes from runoff, and check ADEM's current advisories the day you go.

What's the cleanest lake in Alabama?

The single cleanest lake on measured clarity and nutrients leads the Alabama cleanest-lakes ranking, linked below. The lakes on this page are filtered for swimming — the same clarity and nutrient readings, plus low chlorophyll-a (an active algae filter).

Our swimming filter

Lakes here have to pass three filters:

Clear, low-nutrient water — the top of the state’s measured range for clarity, phosphorus and chlorophyll-a
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 Advisories & bacteria column adds a direct bacteria signal: where the EPA Water Quality Portal has enough E. coli or fecal-coliform samples, we show how often the lake has exceeded the EPA recreation threshold. It is a record of past testing, never a live "safe today" reading — bacteria spike fast after rain. Where a lake carries an EPA 303(d) bacteria or recreation listing, that advisory runs above the bacteria record in the table rather than beside it.

The ranking within the filter is on combined readings (Secchi clarity + phosphorus + chlorophyll-a). Always check current ADEM advisories before swimming.

Where to stay near Alabama swimming lakes

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Top-rated places to stay near Alabama swim lakes

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More on swimming water quality

Best Lakes for Swimming in America, Ranked (2026)

The cleanest lakes for swimming, ranked on EPA nutrient and algae data — plus the one thing a reading cannot tell you the day you go.

Is It Safe to Swim in a Lake? E. coli and Advisories

What a swim advisory actually means, how E. coli monitoring works, how fast a lake clears after rain, and why a long-term reading is not a swim guide.

Lake Water Temperature by Month: How Warm Lakes Get

Typical lake surface temperatures month by month and state by state, from years of monitoring readings — when lakes warm up, how warm they get, and when they turn.

Best Month to Swim, by State — Typical Lake Temperatures

The month when the cleanest lakes in each state are typically warmest, from long-run Water Quality Portal readings rather than this year’s weather.

Source: EPA National Aquatic Resource Surveys, 2026.