Logan County Lake Quality
North Dakota, 1 lakes, average grade C (Fair)
Logan County has 1 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.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Beaver Lake (C) is the cleanest in the county.
Quick Answers for Logan County
Planning a trip? Check special fishing regulations for Beaver Lake, whether the fish are safe to eat, and the best times to fish — or check the official North Dakota fishing regulations.
All Lakes in Logan County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Beaver Lake | C | 1.4 ft | 7.9 ft | - |
Other Counties in North Dakota
See how Logan 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 Logan County
Top-rated places to stay near Logan County
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Source: EPA National Aquatic Resource Surveys, 2026.