Lakes / South Dakota / Codington County / Sumner Slough
Sumner Slough, South Dakota
682.25 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.04 degrees N, 97.28 degrees W - Codington 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 Sumner Slough Stacks Up
- Larger than 85% of the 533 lakes counted in South Dakota.
- About 13 miles from Watertown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Dry Lake | Codington | 1.8 mi | 153.95 acres |
| Still Lake | Codington | 2.4 mi | 339.73 acres |
| Chain of Lakes | Codington | 4.0 mi | 100.32 acres |
| Cooley Lake | Codington | 4.1 mi | 142.58 acres |
| Lake Nicholson | Codington | 4.6 mi | 946.66 acres |
| Horseshoe Lake | Codington | 4.8 mi | 642.97 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Sumner Slough
How Big Is Sumner Slough?
Sumner Slough covers 682.25 acres in Codington County, South Dakota.
What Is the Largest Lake in Codington County?
Lake Kampeska is the largest lake in Codington County, at 5,066.63 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 147525223). Verified October 30, 2026.