Nicollet County Lake Quality
Minnesota, 2 lakes, average grade B (Good)
Only 2 lakes in Nicollet 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. With an average grade of B, Nicollet County sits comfortably above the Minnesota median.
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 Unnamed Lake (A); the most-stressed is Oak Leaf Lake (C).
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Quick Answers for Nicollet County
Planning a trip? Check special fishing regulations for Unnamed Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.
DNR Reports (3)
Minnesota DNR LakeFinder resources for lakes in Nicollet County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — UnnamedFisheries Lake Survey · MN DNR LakeFinder
- —Public Water Access Sites — Oak LeafPublic Water Access Sites · MN DNR LakeFinder
- —Fish Stocking History — UnnamedFish Stocking History · MN DNR LakeFinder
All Lakes in Nicollet County
2 lakes2 graded lakes
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | AUnnamed LakeNicollet | A | 5.6 ft | 14.5 µg/L | 5.9 µg/L | No recent samples | 35 ft | ✓ Public |
| 2 | COak Leaf LakeNicollet | C | 3.9 ft | 30 µg/L | 4.9 µg/L | No recent samples | No recent samples | ✓ Public |
Lake Match
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Other Counties in Minnesota
See how Nicollet 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.