Lakes / South Dakota / Walworth County / Swan Lake
Swan Lake, Walworth County, South Dakota
2,467.35 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.29 degrees N, 99.86 degrees W - Walworth 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 Swan Lake Stacks Up
- Larger than 95% of the 533 lakes counted in South Dakota.
- The largest lake in Walworth County among those counted.
- About 68 miles from Aberdeen, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Flight Lake | Potter | 8.4 mi | 581.93 acres |
| Spring Lake | Walworth | 9.7 mi | 677.81 acres |
| Alkali Lake | Edmunds | 10 mi | 285.41 acres |
| Green Lake | Potter | 13 mi | 1,153.48 acres |
| Horseshoe Lake | Walworth | 19 mi | 66.22 acres |
| Lake Hurley | Potter | 20 mi | 106.01 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Swan Lake
How Big Is Swan Lake?
Swan Lake covers 2,467.35 acres in Walworth County, South Dakota.
What Is the Largest Lake in Walworth County?
Swan Lake is the largest lake in Walworth County, at 2,467.35 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 139473477). Verified October 30, 2026.