Lakes / South Dakota / Brookings County / Oak Lake
Oak Lake, South Dakota
400.8 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
44.52 degrees N, 96.53 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 Oak Lake Stacks Up
- Larger than 79% of the 533 lakes counted in South Dakota.
- About 39 miles from Watertown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Lake Hendricks | Brookings | 3.9 mi | 1,528.59 acres |
| Fish Lake | Deuel | 6.5 mi | 737.12 acres |
| Cottonwood Slough | Deuel | 8.5 mi | 52.39 acres |
| South Slough | Deuel | 13 mi | 249.58 acres |
| Lake Cochrane | Deuel | 14 mi | 363 acres |
| Culver Lake | Deuel | 14 mi | 76.3 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Oak Lake
How Big Is Oak Lake?
Oak Lake covers 400.8 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 122851934). Verified October 30, 2026.