Lakes / South Dakota / Charles Mix County / Lake Francis Case
Lake Francis Case, South Dakota
82,166.92 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
43.45 degrees N, 99.10 degrees W - Charles Mix 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 Lake Francis Case Stacks Up
- Ranks #2 for surface area among the South Dakota lakes counted so far - 82,166.92 acres.
- The largest lake in Charles Mix County among those counted.
- About 89 miles from Pierre, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Academy Lake | Charles Mix | 0.7 mi | 32.37 acres |
| Smith Lake | Brule | 7.9 mi | 70.92 acres |
| Lake Platte | Charles Mix | 11 mi | 117.87 acres |
| Red Lake | Brule | 20 mi | 151.48 acres |
| Lake Burch | Gregory | 20 mi | 110.46 acres |
| Joubert Lake | Douglas | 21 mi | 30.23 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Francis Case
How Big Is Lake Francis Case?
Lake Francis Case covers 82,166.92 acres in Charles Mix County, South Dakota.
What Is the Largest Lake in Charles Mix County?
Lake Francis Case is the largest lake in Charles Mix County, at 82,166.92 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 148215209). Verified October 30, 2026.