Lakes / South Dakota / Lake County / Molumby Slough
Molumby Slough, South Dakota
201.89 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
44.19 degrees N, 97.00 degrees W - Lake 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 Molumby Slough Stacks Up
- Larger than 65% of the 533 lakes counted in South Dakota.
- About 47 miles from Sioux Falls, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Pederson Slough | Brookings | 1.9 mi | 48.68 acres |
| Nelson Slough | Brookings | 1.9 mi | 70.43 acres |
| Mud Lake | Lake | 2.0 mi | 135.91 acres |
| East Lake Badus | Lake | 5.1 mi | 138.87 acres |
| Green Lake | Lake | 5.8 mi | 66.85 acres |
| Lake Sinai | Brookings | 6.2 mi | 1,789.59 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Molumby Slough
How Big Is Molumby Slough?
Molumby Slough covers 201.89 acres in Lake County, South Dakota.
What Is the Largest Lake in Lake County?
Lake Madison is the largest lake in Lake County, at 2,763.52 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 126760305). Verified October 30, 2026.