Sheridan County Lake Quality
Nebraska, 2 lakes, average grade F (Very Poor)
Sheridan County has 2 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 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 Nla Lake (D); the most-stressed is Smith Lake (F).
Quick Answers for Sheridan County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Nebraska fishing regulations.
All Lakes in Sheridan County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | D | 1.4 ft | 566000 µg/L |
| 2 | Smith Lake | F | 1.7 ft | 248 µg/L |
Other Counties in Nebraska
See how Sheridan County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near Sheridan County
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Source: EPA National Aquatic Resource Surveys, 2026.