Lakes / South Dakota / Grant County / Mud Lake
Mud Lake, Grant County, South Dakota
39.04 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.01 degrees N, 96.68 degrees W - Grant 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 Mud Lake Stacks Up
- Larger than 11% of the 533 lakes counted in South Dakota.
- About 23 miles from Watertown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Pyror Slough | Grant | 7.1 mi | 32.37 acres |
| Bullhead Lake | Deuel | 7.5 mi | 346.44 acres |
| Round Lake | Deuel | 8.0 mi | 931.09 acres |
| School Lake | Deuel | 8.4 mi | 323.21 acres |
| Wigdale Lake | Deuel | 8.6 mi | 692.39 acres |
| Crooked Lake | Grant | 8.7 mi | 400.8 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Mud Lake
How Big Is Mud Lake?
Mud Lake covers 39.04 acres in Grant County, South Dakota.
What Is the Largest Lake in Grant County?
Crooked Lake is the largest lake in Grant County, at 400.8 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 122551113). Verified October 30, 2026.