Lakes / South Dakota / Campbell County / East Flat Lake
East Flat Lake, South Dakota
151.72 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.66 degrees N, 99.76 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 East Flat Lake Stacks Up
- Larger than 54% of the 533 lakes counted in South Dakota.
- About 63 miles from Aberdeen, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Flat Lake | Campbell | 1.6 mi | 113.17 acres |
| Heupel Lake | McPherson | 3.0 mi | 45.71 acres |
| Feinstein Lake | McPherson | 3.0 mi | 152.46 acres |
| Bowdle-Hosmer Lake | Edmunds | 7.1 mi | 129.73 acres |
| Salt Lake | Campbell | 7.7 mi | 318.77 acres |
| Horseshoe Lake | Walworth | 8.3 mi | 66.22 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About East Flat Lake
How Big Is East Flat Lake?
East Flat Lake covers 151.72 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 147896883). Verified October 30, 2026.