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Iron County Lake Quality

Wisconsin, 34 lakes, average grade A (Excellent)

There are 34 graded lakes in Iron County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. On average, Iron County lakes grade an A. That puts it near the top of the Wisconsin county ranking.

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 Long Lake (A); the most-stressed is First Black Lake (B).

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DNR Reports (8)

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

All Lakes in Iron County

RankLakeGradeClarityMax DepthPhosphorus
1Long LakeA18 ft34 ft-
2Spider LakeA27.9 ft-14.1 µg/L
3Weber LakeA36.1 ft39 ft-
4Pine LakeA19.7 ft41 ft17.8 µg/L
5Fisher LakeA24.6 ft-16.7 µg/L
6Fox LakeA19.7 ft23 ft-
7Cedar LakeA24.8 ft21 ft18.3 µg/L
8Sand LakeA46.8 ft35 ft-
9Charnley LakeA41 ft-11 µg/L
10Lake of the FallsA16.4 ft23 ft19.6 µg/L
11Turtle Flambeau Flowage LakeA19.7 ft-19.7 µg/L
12Mercer LakeA39 ft24 ft16.5 µg/L
13Wilson LakeA36.1 ft21 ft14.1 µg/L
14Deer LakeA22.1 ft18 ft-
15Grand Portage LakeA36.1 ft33 ft11.9 µg/L
16Long Lake 44-40eA18 ft34 ft17.4 µg/L
17Echo LakeA21.3 ft-19.3 µg/L
18Pike LakeA26.2 ft--
19Little Pine LakeA24.6 ft32 ft13.3 µg/L
20Martha LakeA26.2 ft55 ft-
21Upper Springstead LakeA36.1 ft22 ft-
22Hewitt LakeA55.8 ft88 ft-
23Pardee LakeA24.9 ft27 ft-
24Lake DorothyA25.8 ft26 ft16.9 µg/L
25Unnamed LakeA29.5 ft--
26Little Pike LakeA23.5 ft20 ft-
27Catherine LakeA21.3 ft14 ft-
28Lower Springstead LakeA30.3 ft27 ft-
29Rice LakeA16.4 ft21 ft22.5 µg/L
30Island LakeB11.5 ft17 ft-
31Saxon Fall Flowage LakeB26.2 ft-42.6 µg/L
32Turtle-Flambeau Flowage LakeB13.1 ft50 ft-
33First Black LakeB8.2 ft19 ft27.5 µg/L
34Gile Flowage LakeB14.8 ft-30.6 µg/L

Source: EPA National Aquatic Resource Surveys, 2026.