Lakes / South Dakota / Deuel County / Round Lake
Round Lake, Deuel County, South Dakota
931.09 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
44.96 degrees N, 96.83 degrees W - Deuel 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 Round Lake Stacks Up
- Larger than 87% of the 533 lakes counted in South Dakota.
- About 15 miles from Watertown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Bullhead Lake | Deuel | 1.5 mi | 346.44 acres |
| School Lake | Deuel | 1.7 mi | 323.21 acres |
| Pyror Slough | Grant | 3.2 mi | 32.37 acres |
| Wigdale Lake | Deuel | 3.6 mi | 692.39 acres |
| Crooked Lake | Grant | 4.0 mi | 400.8 acres |
| Mud Lake | Grant | 8.0 mi | 39.04 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Round Lake
How Big Is Round Lake?
Round Lake covers 931.09 acres in Deuel County, South Dakota.
What Is the Largest Lake in Deuel County?
Lake Alice is the largest lake in Deuel County, at 1,058.09 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 126757437). Verified October 30, 2026.