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.
Quick Answers for Le Sueur County
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.
DNR Reports (38)
Minnesota DNR LakeFinder resources for lakes in Le Sueur County. Showing 12 most recent — browse all reports →
- —Fisheries Lake Survey — WashingtonFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — VolneyFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — Upper SakatahFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — TetonkaFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — ScotchFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — RoemhildtsFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — RaysFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — East JeffersonFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — GermanFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — FrancesFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — FishFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — EmilyFisheries Lake Survey · MN DNR LakeFinder
All Lakes in Le Sueur County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Fish Lake | A | 11.8 ft | 55 ft | 18 µg/L |
| 2 | Roemhildts Lake | B | 10.2 ft | 60 ft | 21 µg/L |
| 3 | Frances Lake | C | 6 ft | 60 ft | 25 µg/L |
| 4 | Volney Lake | C | 5 ft | 67 ft | 52.5 µg/L |
| 5 | Scotch Lake | D | 4.1 ft | 11 ft | 569 µg/L |
| 6 | Rays Lake | D | 3.6 ft | 32 ft | - |
| 7 | Lake Jefferson | D | 4 ft | 37 ft | - |
| 8 | German Lake | D | 3.2 ft | 51 ft | 84 µg/L |
| 9 | Washington Lake | F | 4.5 ft | 51 ft | 121 µg/L |
| 10 | Emily Lake | F | 2 ft | 37 ft | 63 µg/L |
| 11 | Tetonka Lake | F | 3 ft | 35 ft | 363 µg/L |
| 12 | Jefferson Lake | F | 2 ft | - | 90 µg/L |
| 13 | Upper Sakatah Lake | F | 3 ft | 12 ft | 406 µg/L |
| 14 | Henry Lake | F | 2 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.