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LakeQuality
D

Le Sueur County Lake Quality

Minnesota, 14 lakes, average grade D (Poor)

Only 14 lakes in Le Sueur County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 6 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 A) is the cleanest in the county.

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DNR Reports (38)

Minnesota DNR LakeFinder resources for lakes in Le Sueur County. Showing 12 most recent — browse all reports →

All Lakes in Le Sueur County

RankLakeGradeClarityMax DepthPhosphorus
1Fish LakeA11.8 ft55 ft18 µg/L
2Roemhildts LakeB10.2 ft60 ft21 µg/L
3Frances LakeC6 ft60 ft25 µg/L
4Volney LakeC5 ft67 ft52.5 µg/L
5Scotch LakeD4.1 ft11 ft569 µg/L
6Rays LakeD3.6 ft32 ft-
7Lake JeffersonD5 ft37 ft-
8German LakeD3.2 ft51 ft84 µg/L
9Washington LakeF4.5 ft51 ft116 µg/L
10Emily LakeF2 ft37 ft63 µg/L
11Tetonka LakeF3 ft35 ft363 µg/L
12Jefferson LakeF2 ft-90 µg/L
13Upper Sakatah LakeF3 ft12 ft406 µg/L
14Henry LakeF2 ft--

Source: EPA National Aquatic Resource Surveys, 2026.