Sherman County Lake Quality
Nebraska, 2 lakes, average grade C (Fair)
Sherman 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. Sherman County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 (C); the most-stressed is Nla Lake (C).
Quick Answers for Sherman County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Nebraska fishing regulations.
All Lakes in Sherman County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | C | 1.4 ft | 120521.2 µg/L |
| 2 | Sherman Reservoir | C | 2.4 ft | 100 µg/L |
Other Counties in Nebraska
See how Sherman 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 Sherman County
Top-rated places to stay near Sherman County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Sherman County?
Get lake water-quality report cards plus the best cabin & lodging deals near Sherman County — straight to your inbox. No spam, unsubscribe anytime.
Source: EPA National Aquatic Resource Surveys, 2026.