Bennett County Lake Quality
South Dakota, 1 lakes, average grade (Not rated)
Only 1 lakes in Bennett 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'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 Yellow Bear Reservoir (—); the most-stressed is Yellow Bear Reservoir (—).
Quick Answers for Bennett County
Planning a trip? Check special fishing regulations for Yellow Bear Reservoir — or check the official South Dakota fishing regulations.
All Lakes in Bennett County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Yellow Bear Reservoir | - | - |
Other Counties in South Dakota
See how Bennett County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 36 states and 2 Canadian provinces.
Where to stay near Bennett County
Top-rated places to stay near Bennett 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 Bennett County?
Get lake water-quality report cards plus the best cabin & lodging deals near Bennett County — straight to your inbox. No spam, unsubscribe anytime.
Source: EPA National Aquatic Resource Surveys, 2026.