Freeborn County Lake Quality
Minnesota, 4 lakes, average grade F (Very Poor)
Only 4 lakes in Freeborn 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 average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 State Line Lake (D); the most-stressed is Fountain Lake (F).
Quick Answers for Freeborn County
Planning a trip? Check special fishing regulations for State Line Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.
DNR Reports (10)
Minnesota DNR LakeFinder resources for lakes in Freeborn County. browse all reports →
- —Fisheries Lake Survey — State LineFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — PickeralFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — FountainFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — FountainFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — FountainPublic Water Access Sites · MN DNR LakeFinder
- —Public Water Access Sites — Lower TwinPublic Water Access Sites · MN DNR LakeFinder
- —Fish Stocking History — PickeralFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — PickeralPublic Water Access Sites · MN DNR LakeFinder
- —Fish Stocking History — State LineFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — State LinePublic Water Access Sites · MN DNR LakeFinder
All Lakes in Freeborn County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | State Line Lake | D | 5.2 ft | - | - |
| 2 | Fountain Lake | F | 1.5 ft | 14 ft | - |
| 3 | Lower Twin Lake | F | 1.8 ft | - | - |
| 4 | Pickeral Lake | F | 1 ft | 6 ft | - |
Source: EPA National Aquatic Resource Surveys, 2026.