Roberts County Lake Quality
South Dakota, 2 lakes, average grade F (Very Poor)
Roberts 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. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 Traverse Lake (D); the most-stressed is Big Stone Lake (F).
Quick Answers for Roberts County
Planning a trip? Check special fishing regulations for Traverse Lake — or check the official South Dakota fishing regulations.
All Lakes in Roberts County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Traverse Lake | D | 3.9 ft | 173 µg/L |
| 2 | Big Stone Lake | F | 3 ft | 108.5 µg/L |
Other Counties in South Dakota
See how Roberts County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
Where to stay near Roberts County
Top-rated places to stay near Roberts 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 Roberts County?
Get lake water-quality report cards plus the best cabin & lodging deals near Roberts County — straight to your inbox. No spam, unsubscribe anytime.
Source: EPA National Aquatic Resource Surveys, 2026.