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

Marathon County Lake Quality

Wisconsin, 31 lakes, measured by Wisconsin DNR

The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. 4 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. The county's readings sit in the middle of the Wisconsin range, with one or two lakes pulling the average up or down depending on year.

The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Big Bass Lake.

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Where to stay near Marathon County

Top-rated places to stay near Marathon County

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Quick Answers for Marathon County

Cleanest lakes in Marathon County →Cleanest lakes in Wisconsin →Best swimming lakes in Wisconsin →

Planning a trip? Check special fishing regulations for Big Bass Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.

Fishing in Marathon County

Marathon County Fishing Guide

Fish species and the cleanest lakes in Marathon County

DNR Reports (5)

Wisconsin DNR Fisheries Survey resources for lakes in Marathon County. browse all reports →

These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).

All Lakes in Marathon County

31 lakes · 4 ranked on readings, 27 without enough sampling4 lakes ranked on readings · 27 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
1Big Bass LakeMarathon6 ft19 µg/LNo recent samplesNo recent samples13 ft✓ Public
2Pike LakeMarathon5 ft29.3 µg/LNo recent samplesNo recent samples34 ft✓ Public
3Big Eau Pleine LakeMarathon1.5 ft131 µg/LNo recent samplesNo recent samplesNo recent samples✓ Public
4Lake DubayMarathon2.5 ft64.9 µg/LNo recent samplesNo recent samplesNo recent samples✓ Public
Big Eau Pleine Southeast Point LakeMarathon1.5 ftNo recent samplesNo recent samplesNo recent samples46 ft✓ Public
Eau Claire FlowageMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples10 ft✓ Public
Lake WausauMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples30 ft✓ Public
Mosinee FlowageMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples18 ft✓ Public
Little Frog LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples6 ftNot recorded
Mission LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples26 ft✓ Public
Rice LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples14 ft✓ Public
Lost LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples23 ft✓ Public
Norrie LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples19 ft✓ Public
Mayflower LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples16 ft✓ Public
Mud LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples17 ft✓ Public
Bass LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples6 ft✓ Public
Lilly LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples5 ftNot recorded
Stenson LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples22 ftNot recorded
Moen LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples16 ftNot recorded
Wadley LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples27 ft✓ Public
Pool FiveMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Townline ReservoirMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Townline FlowageMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples12 ftNot recorded
Smoky Hill FlowageMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples10 ftNot recorded
North Honey Island FlowageMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples7 ftNot recorded
Teal FlowageMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples13 ftNot recorded
North Townline FlowageMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples9 ftNot recorded
Honey Island FlowageMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples7 ftNot recorded
Rangeline FlowageMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples9 ftNot recorded
South Rice LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples5 ftNot recorded
North Rice LakeMarathonNo recent samplesNo recent samplesNo recent samplesNo recent samples5 ftNot recorded

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

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Other Counties in Wisconsin

Outagamie County

2 lakes

Washington County

18 lakes

Sawyer County

120 lakes

Forest County

89 lakes

Kenosha County

20 lakes

Marinette County

65 lakes

Browse every Wisconsin lake, or the full directory of lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: the Wisconsin Department of Natural Resources. See data sources.