Grant County Lake Quality
North Dakota, 6 lakes, average grade C (Fair)
Grant County has 6 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 average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
A meaningful share of Grant's lakes break 50 feet of depth, which matters because deep lakes hold cooler water all summer and resist the resuspended-sediment problems that plague shallow basins. The county's best-graded lake is Lake Tschida (C).
Quick Answers for Grant County
Planning a trip? Check special fishing regulations for Lake Tschida — or check the official North Dakota fishing regulations.
Fishing in Grant County
All Lakes in Grant County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Lake Tschida | C | 6 ft | - | 23.5 µg/L |
| 2 | Lake Tschida | C | 5.1 ft | 57 ft | - |
| 3 | Lake Tschida | C | 5.2 ft | 57 ft | - |
| 4 | Lake Tschida | C | 2.4 ft | 57 ft | - |
| 5 | Lake Tschida | C | 3.6 ft | 57 ft | - |
| 6 | Sheep Creek Dam Lake | D | 2.7 ft | 33 ft | - |
Other Counties in North Dakota
See how Grant County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
Where to stay near Grant County
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Source: EPA National Aquatic Resource Surveys, 2026.