Jefferson County Lake Quality
Nebraska, 4 lakes, average grade D (Poor)
Only 4 lakes in Jefferson 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-wide average grade is D — water quality issues are persistent across most of the monitored basins. 1 lakes fall into the F bracket outright.
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. Cub Creek Lake (B) is the cleanest in the county.
Quick Answers for Jefferson County
Planning a trip? Check special fishing regulations for Cub Creek Lake — or check the official Nebraska fishing regulations.
All Lakes in Jefferson County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Cub Creek Lake | B | 0.2 ft | - |
| 2 | Nla Lake | C | - | 1365 µg/L |
| 3 | Nla Lake | F | 1.1 ft | 1136.8 µg/L |
Other Counties in Nebraska
See how Jefferson 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 Jefferson County
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Source: EPA National Aquatic Resource Surveys, 2026.