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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water
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Gladwin County Lake Quality

Michigan, 29 lakes, average grade A (Excellent)

There are 29 monitored lakes in Gladwin County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. 4 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county's average grade is A — among the cleanest in Michigan. 4 lakes pull an A on their own, and almost none fall into the D or F brackets.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Lake Twenty (Aka (A); the most-stressed is Lake Twenty (Aka (A).

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Where to stay near Gladwin County

Top-rated places to stay near Gladwin County

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Quick Answers for Gladwin County

Cleanest lakes in Gladwin County →Cleanest lakes in Michigan →Safest swimming lakes in Michigan →

Planning a trip? Check special fishing regulations for Lake Twenty (Aka — or check the official Michigan fishing regulations.

All Lakes in Gladwin County

29 lakes · 4 graded, 25 not rated4 graded lakes · 25 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicMax DepthAccess
1ALake Twenty (AkaGladwinA8.5 ft20.5 µg/L2.7 µg/LNo recent samplesNo recent samplesNot recorded
2ALancelot LakeGladwinA9 ft15 µg/L3.5 µg/LNo recent samplesNo recent samples✓ Public
3ALancer Lake SoutheastGladwinA12 ft18 µg/L1.5 µg/LNo recent samplesNo recent samplesNot recorded
4AIsland LakeGladwinA16.5 ft7.5 µg/L2.4 µg/LNo recent samplesNo recent samples✓ Public
NRLake LancelotGladwinNR9 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Lake TwentyGladwinNR9 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLancelot LakeGladwinNR8 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake LancerGladwinNR11 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLancelot LakeGladwinNR9.5 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRGrass LakeGladwinNR4 ftNo recent samplesNo recent samplesNo recent samples8 ftNot recorded
NRElk LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples39 ftNot recorded
NRLake FourGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples25 ft✓ Public
NRLake LochbraeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples35 ftNot recorded
NRSecord LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples40 ftNot recorded
NRMcGilvery LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples37 ftNot recorded
NRSmallwood LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples20 ftNot recorded
NRPratt LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples25 ft✓ Public
NRWiggins LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples25 ft✓ Public
NRLake TwentyGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples26 ftNot recorded
NRRoss LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples15 ft✓ Public
NRWixom LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samples40 ft✓ Public
NRTrout LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRIndian LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMud LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMolasses River Flooding Number TwoGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSmallwood LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMolasses River Flooding Number ThreeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKerswill LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRound LakeGladwinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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Other Counties in Michigan

Dickinson County

43 lakes · Avg grade A

Clare County

47 lakes · Avg grade A

Ogemaw County

50 lakes · Avg grade A

Cheboygan County

31 lakes · Avg grade A

Roscommon County

26 lakes · Avg grade A

Alcona County

26 lakes · Avg grade A

See how Gladwin County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: EPA National Aquatic Resource Surveys, 2026.