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LakeQuality
D

Le Sueur County Lake Quality

Minnesota, 16 lakes, average grade D (Nutrient-rich)

There are 16 graded lakes in Le Sueur County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 8 lakes fall into the F bracket outright.

Many of the county's lakes are deep glacial basins — over 50 feet at their deepest point — which gives them thermal stratification and a buffer against summer warming. Fish Lake (grade C) is the cleanest in the county.

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Quick Answers for Le Sueur County

Cleanest lakes in Le Sueur County →Cleanest lakes in Minnesota →Safest swimming lakes in Minnesota →

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

Fishing in Le Sueur County

Le Sueur County Fishing Guide

Fish species and best-graded lakes in Le Sueur County

DNR Reports (38)

Minnesota DNR LakeFinder resources for lakes in Le Sueur County. browse all reports →

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

All Lakes in Le Sueur County

16 lakes · 13 graded, 3 not rated13 graded lakes · 3 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicMax DepthAccess
1CFish LakeLe SueurC11.8 ft25.5 µg/L3.7 µg/LNo recent samples55 ft✓ Public
2CRoemhildts LakeLe SueurC10.2 ft25.5 µg/L5.3 µg/LNo recent samples60 ft✓ Public
3DVolney LakeLe SueurD5.5 ft45 µg/L25.4 µg/LNo recent samples67 ft✓ Public
4DFrances LakeLe SueurD6 ft23 µg/L20.6 µg/LNo recent samples60 ft✓ Public
5DScotch LakeLe SueurD2.6 ft569 µg/L9.7 µg/LNo recent samples11 ft✓ Public
6FTetonka LakeLe SueurF3 ft289 µg/L48 µg/LNo recent samples35 ft✓ Public
7FClear LakeLe SueurF1.2 ft309.5 µg/L71.6 µg/LNo recent samples18 ft✓ Public
8FWashington LakeLe SueurF4.5 ft122 µg/L51.3 µg/LNo recent samples51 ft✓ Public
9FEmily LakeLe SueurF2 ft61 µg/L42.7 µg/LNo recent samples37 ft✓ Public
10FJefferson LakeLe SueurF2 ft86.5 µg/L72 µg/LNo recent samplesNo recent samples✓ Public
11FGerman LakeLe SueurF3.5 ft74 µg/L61.9 µg/LNo recent samples51 ft✓ Public
12FUpper Sakatah LakeLe SueurF3 ft303 µg/L76.8 µg/LNo recent samples12 ft✓ Public
13FGorman LakeLe SueurF3.7 ft531.5 µg/L47 µg/LNo recent samples14 ft✓ Public
NRRays LakeLe SueurNR3.5 ftNo recent samplesNo recent samplesNo recent samples32 ft✓ Public
NRLake JeffersonLe SueurNR4 ftNo recent samplesNo recent samplesNo recent samples37 ft✓ Public
NRHenry LakeLe SueurNR2 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public

NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

Lake Match

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Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.

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Other Counties in Minnesota

Clay County

2 lakes · Avg grade A

Morrison County

16 lakes · Avg grade A

Hubbard County

76 lakes · Avg grade A

Cass County

130 lakes · Avg grade A

Cook County

139 lakes · Avg grade A

Crow Wing County

121 lakes · Avg grade A

See how Le Sueur County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.

Source: EPA National Aquatic Resource Surveys, 2026.