Foster County Lake Quality
North Dakota, 1 lakes, average grade F (Very Poor)
Only 1 lakes in Foster 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 Juanita Lake (F); the most-stressed is Juanita Lake (F).
Quick Answers for Foster County
Planning a trip? Check special fishing regulations for Juanita 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 Foster County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Juanita Lake | F | 1 ft | 9.9 ft | - |
Other Counties in North Dakota
See how Foster 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 Foster County
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Source: EPA National Aquatic Resource Surveys, 2026.