Keith County Lake Quality
Nebraska, 3 lakes, average grade B (Good)
Keith County has 3 monitored 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. 2 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. With an average grade of B, Keith County sits comfortably above the Nebraska median.
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 Lake C W Mcconaughy (A); the most-stressed is Lake Ogallala (D).
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Quick Answers for Keith County
Planning a trip? Check special fishing regulations for Lake C W Mcconaughy — or check the official Nebraska fishing regulations.
All Lakes in Keith County
3 lakes · 2 graded, 1 not rated2 graded lakes · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ALake C W McconaughyKeith | A | 7.2 ft | 57.6 µg/L | 6.9 µg/L | No recent samples | ✓ Public |
| 2 | DLake OgallalaKeith | D | 4.9 ft | 52.2 µg/L | 14.2 µg/L | No recent samples | ✓ Public |
| NRBerry LakeKeith | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Nebraska
See how Keith County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.