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

Florence County Lake Quality

Wisconsin, 64 lakes, measured by Wisconsin DNR

Florence County has 64 monitored lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the measurements reflect that mix. 12 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. The county-wide picture is low-to-moderate phosphorus with clear summer transparency across most monitored lakes.

Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Bass Lake has the lowest nutrient and algae readings in the county.

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Where to stay near Florence County

Top-rated places to stay near Florence County

Prices for Oct 9–11, 4 adults. Change dates on the map below.

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Quick Answers for Florence County

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

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

Fishing in Florence County

Florence County Fishing Guide

Fish species and the cleanest lakes in Florence County

DNR Reports (18)

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

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

All Lakes in Florence County

64 lakes · 12 ranked on readings, 52 without enough sampling12 lakes ranked on readings · 52 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
1Bass LakeFlorence12 ft11.6 µg/LNo recent samplesNo recent samples16 ftNot recorded
2Halsey LakeFlorence6.5 ft18 µg/LNo recent samplesNo recent samples10 ft✓ Public
3Frog LakeFlorence9.5 ft16.2 µg/LNo recent samplesNo recent samplesNo recent samplesNot recorded
4Reisner LakeFlorence6.5 ft18.1 µg/LNo recent samplesNo recent samples5 ftNot recorded
5Fay LakeFlorence7 ft15.5 µg/LNo recent samplesNo recent samples10 ft✓ Public
6Sea Lion LakeFlorence21 ft11.5 µg/LNo recent samplesNo recent samples82 ft✓ Public
7Ellwood LakeFlorence13 ft12 µg/LNo recent samplesNo recent samples25 ft✓ Public
8Keyes LakeFlorence21 ft11.4 µg/LNo recent samplesNo recent samplesNo recent samples✓ Public
9Lost LakeFlorence10.6 ft13 µg/LNo recent samplesNo recent samples45 ft✓ Public
10Porcupine LakeFlorence11 ft13.4 µg/LNo recent samplesNo recent samples20 ftNot recorded
11Patten LakeFlorence10.2 ft15 µg/LNo recent samplesNo recent samples52 ft✓ Public
12Long LakeFlorence7.9 ft25.2 µg/LNo recent samplesNo recent samples21 ft✓ Public
Mirror LakeFlorence8.5 ftNo recent samplesNo recent samplesNo recent samples13 ft✓ Public
North LakeFlorence15 ftNo recent samplesNo recent samplesNo recent samples43 ft✓ Public
Emily LakeFlorence8.3 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Loon LakeFlorence16.8 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Sand LakeFlorence12.2 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Sand LakeFlorence10.8 ftNo recent samplesNo recent samplesNo recent samples28 ft✓ Public
West LakeFlorence12 ftNo recent samplesNo recent samplesNo recent samples25 ftNot recorded
Fisher LakeFlorence8.2 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
East Bass LakeFlorence17.8 ftNo recent samplesNo recent samplesNo recent samples42 ft✓ Public
Fischer LakeFlorence5.5 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Morgan LakeFlorence8.6 ftNo recent samplesNo recent samplesNo recent samples10 ft✓ Public
Scout LakeFlorence14.2 ftNo recent samplesNo recent samplesNo recent samples26 ft✓ Public
Long Lake -Spread Eagle ChainFlorence13.5 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
West Lake -Spread Eagle ChainFlorence9.5 ftNo recent samplesNo recent samplesNo recent samples68 ftNot recorded
Cosgrove LakeFlorence9.4 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Montgomery LakeFlorence6.8 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Sealion LakeFlorence25.6 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Barrens LakeFlorence13.1 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Lake of DreamsFlorence10.2 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Seidel LakeFlorence7.3 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Little Cosgrove LakeFlorence8.6 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Twin Falls Flowage Us Twin Falls Dam LakeFlorence7 ftNo recent samplesNo recent samplesNo recent samples50 ft✓ Public
Lake AnnaFlorence20.5 ftNo recent samplesNo recent samplesNo recent samples61 ft✓ Public
Middle Lake -Spread Eagle ChainFlorence14.4 ftNo recent samplesNo recent samplesNo recent samples54 ftNot recorded
Bush LakeFlorence8.1 ftNo recent samplesNo recent samplesNo recent samples18 ft✓ Public
West Bass LakeFlorence14.4 ftNo recent samplesNo recent samplesNo recent samples19 ft✓ Public
Duck LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples3 ftNot recorded
Lauterman LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Perch LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples39 ftNot recorded
Grub Hoe LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples4 ftNot recorded
Grandma LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples9 ftNot recorded
Lake of DreamsFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples12 ft✓ Public
Wheeler LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples4 ftNot recorded
Lund LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples26 ftNot recorded
Mud LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples8 ftNot recorded
Halls LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples4 ft✓ Public
Sand LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples63 ft✓ Public
Pine River FlowageFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples38 ftNot recorded
Emily LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples43 ftNot recorded
Frog LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples21 ftNot recorded
Cosgrove LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples26 ftNot recorded
Fisher LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples49 ft✓ Public
Bessie Babbet LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples11 ftNot recorded
Keyes LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples77 ftNot recorded
Loon LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples55 ftNot recorded
Price LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples8 ftNot recorded
Savage LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples10 ftNot recorded
Robago LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples3 ftNot recorded
Riley LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples38 ftNot recorded
Boot LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples30 ftNot recorded
Edith LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples72 ftNot recorded
Duck LakeFlorenceNo recent samplesNo recent samplesNo recent samplesNo recent samples7 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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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.