Lakes / South Dakota / Campbell County / Flat Lake
Flat Lake, Campbell County, South Dakota
113.17 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.68 degrees N, 99.79 degrees W - Campbell 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 Flat Lake Stacks Up
- Larger than 47% of the 533 lakes counted in South Dakota.
- About 65 miles from Aberdeen, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| East Flat Lake | Campbell | 1.6 mi | 151.72 acres |
| Feinstein Lake | McPherson | 3.6 mi | 152.46 acres |
| Heupel Lake | McPherson | 4.2 mi | 45.71 acres |
| Salt Lake | Campbell | 7.0 mi | 318.77 acres |
| Bowdle-Hosmer Lake | Edmunds | 8.7 mi | 129.73 acres |
| Eureka Lake | McPherson | 9.6 mi | 188.54 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Flat Lake
How Big Is Flat Lake?
Flat Lake covers 113.17 acres in Campbell County, South Dakota.
What Is the Largest Lake in Campbell County?
Lake Pocasse is the largest lake in Campbell County, at 1,370.69 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 147896732). Verified October 30, 2026.