Kimball County Lake Quality
Nebraska, 2 lakes, average grade B (Good)
Kimball County holds 2 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. With an average grade of B, Kimball County sits comfortably above the Nebraska median.
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. Oliver Reservoir (B) is the cleanest in the county.
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Quick Answers for Kimball County
Planning a trip? Check special fishing regulations for Oliver Reservoir — or check the official Nebraska fishing regulations.
All Lakes in Kimball County
2 lakes · 1 graded, 1 not rated1 graded lake · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BOliver ReservoirKimball | B | 1.7 ft | 71.8 µg/L | 7.9 µg/L | No recent samples | Not recorded |
| NROliver ReservoirKimball | 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 Kimball 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.