Lakes / South Dakota / Aurora County / Wilmarth Lake
Wilmarth Lake, South Dakota
106.26 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
43.86 degrees N, 98.58 degrees W - Aurora 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 Wilmarth Lake Stacks Up
- Larger than 44% of the 533 lakes counted in South Dakota.
- About 95 miles from Pierre, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Scott Lake | Aurora | 8.3 mi | 28.91 acres |
| White Lake | Aurora | 8.8 mi | 1,693.93 acres |
| Schmitz Lake | Aurora | 9.1 mi | 32.37 acres |
| Fish Lake | Aurora | 13 mi | 190.27 acres |
| Grass Lake | Jerauld | 14 mi | 64.74 acres |
| Deans Lake | Jerauld | 14 mi | 26.29 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Wilmarth Lake
How Big Is Wilmarth Lake?
Wilmarth Lake covers 106.26 acres in Aurora County, South Dakota.
What Is the Largest Lake in Aurora County?
White Lake is the largest lake in Aurora County, at 1,693.93 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 125125821). Verified October 30, 2026.