Lakes / South Dakota / Brookings County / Nelson Slough
Nelson Slough, South Dakota
70.43 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
44.22 degrees N, 97.01 degrees W - Brookings County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Nelson Slough Stacks Up
- Larger than 27% of the 533 lakes counted in South Dakota.
- About 47 miles from Watertown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Molumby Slough | Lake | 1.9 mi | 201.89 acres |
| Pederson Slough | Brookings | 2.5 mi | 48.68 acres |
| Mud Lake | Lake | 3.9 mi | 135.91 acres |
| Lake Sinai | Brookings | 4.4 mi | 1,789.59 acres |
| East Lake Badus | Lake | 4.8 mi | 138.87 acres |
| Green Lake | Lake | 7.7 mi | 66.85 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Nelson Slough
How Big Is Nelson Slough?
Nelson Slough covers 70.43 acres in Brookings County, South Dakota.
What Is the Largest Lake in Brookings County?
Lake Sinai is the largest lake in Brookings County, at 1,789.59 acres.
Largest Lakes in South Dakota
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Oahe | Dewey | 309,912.57 acres | - |
| 2 | Lake Francis Case | Charles Mix | 82,166.92 acres | - |
| 3 | Lake Sharpe | Hughes | 58,419.67 acres | - |
| 4 | Lewis and Clark Lake | Bon Homme | 25,141.99 acres | - |
| 5 | Lake Thompson | Kingsbury | 13,887.93 acres | - |
All 533 South Dakota lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 126760168). Verified October 30, 2026.