Slope County Lake Quality
North Dakota, 2 lakes, average grade C (Fair)
Only 2 lakes in Slope 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 C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Davis Dam Lake (B); the most-stressed is Cedar Lake (F).
Quick Answers for Slope County
Planning a trip? Check special fishing regulations for Davis Dam Lake, whether the fish are safe to eat, and the best times to fish — or check the official North Dakota fishing regulations.
Fishing in Slope County
All Lakes in Slope County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Davis Dam Lake | B | 7.5 ft | 5.8 ft | - |
| 2 | Cedar Lake | F | 1.3 ft | 14.2 ft | - |
Other Counties in North Dakota
See how Slope 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 Slope County
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Source: EPA National Aquatic Resource Surveys, 2026.