Lakes / South Dakota / Lake County
Lakes in Lake County, South Dakota
21 lakes counted in Lake County - the largest is Lake Madison at 2,763.52 acres.
21
Lakes Counted
2,763.52 acres
Largest - Lake Madison
Lake County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Madison | Lake | 2,763.52 acres | - |
| 2 | Lake Herman | Lake | 1,283.22 acres | - |
| 3 | Brant Lake | Lake | 1,033.39 acres | - |
| 4 | Lake Henry | Lake | 517.47 acres | - |
| 5 | Lake George | Lake | 267.71 acres | - |
| 6 | Buffalo Slough | Lake | 246.86 acres | - |
| 7 | Lake Badus | Lake | 233.51 acres | - |
| 8 | Molumby Slough | Lake | 201.89 acres | - |
| 9 | Dry Lake | Lake | 195.95 acres | - |
| 10 | Long Lake | Lake | 192 acres | - |
| 11 | Round Lake | Lake | 179.4 acres | - |
| 12 | East Lake Badus | Lake | 138.87 acres | - |
| 13 | Mud Lake | Lake | 135.91 acres | - |
| 14 | Gilman Lake | Lake | 129.24 acres | - |
| 15 | Crane Slough | Lake | 110.7 acres | - |
| 16 | Milwaukee Lake | Lake | 89.21 acres | - |
| 17 | Green Lake | Lake | 66.85 acres | - |
| 18 | Spring Lake | Lake | 55.6 acres | - |
| 19 | Pelican Lake | Lake | 49.95 acres | - |
| 20 | Herman Slough | Lake | 26.93 acres | - |
| 21 | Lake Winfred | Lake | 25.45 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.