Grant County Lake Quality
Minnesota, 10 lakes, average grade D (Poor)
Grant County has 10 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 3 lakes fall into the F bracket outright.
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 Elk Lake (B); the most-stressed is Unnamed Lake (F).
Quick Answers for Grant County
Planning a trip? Check special fishing regulations for Elk Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.
DNR Reports (12)
Minnesota DNR LakeFinder resources for lakes in Grant County. browse all reports →
- —Fisheries Lake Survey — Pomme de TerreFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — Lower ElkFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — ElkFisheries Lake Survey · MN DNR LakeFinder
- —Fisheries Lake Survey — BarrettFisheries Lake Survey · MN DNR LakeFinder
- —Public Water Access Sites — UnnamedPublic Water Access Sites · MN DNR LakeFinder
- —Fish Stocking History — BarrettFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — BarrettPublic Water Access Sites · MN DNR LakeFinder
- —Fish Stocking History — ElkFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — ElkPublic Water Access Sites · MN DNR LakeFinder
- —Fish Stocking History — Lower ElkFish Stocking History · MN DNR LakeFinder
- —Fish Stocking History — Pomme de TerreFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — Pomme de TerrePublic Water Access Sites · MN DNR LakeFinder
All Lakes in Grant County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Elk Lake | B | 10 ft | 29 ft | - |
| 2 | Unnamed Lake | C | 6.7 ft | - | - |
| 3 | Unnamed Lake | D | 3.6 ft | - | 72 µg/L |
| 4 | Barrett Lake | D | 4 ft | 28 ft | - |
| 5 | Pomme de Terre Lake | D | 4 ft | 23 ft | - |
| 6 | Lower Elk Lake | D | 1.8 ft | 13 ft | 58.5 µg/L |
| 7 | Barrows Lake | D | 6.6 ft | - | 287 µg/L |
| 8 | Unnamed Lake | F | 0.7 ft | - | 269 µg/L |
| 9 | Flekkefjord Lake | F | 2.6 ft | - | - |
| 10 | 26-0290-00 Lake | F | 3.3 ft | - | 270 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.