Nicollet County Lake Quality
Minnesota, 2 lakes, average grade C (Fair)
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. Nicollet County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 (B); the most-stressed is Oak Leaf Lake (D).
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 →
- —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
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Unnamed Lake | B | 5 ft | 35 ft | 14.5 µg/L |
| 2 | Oak Leaf Lake | D | 3.3 ft | - | 30 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.