Lakes / South Dakota / Marshall County / South Red Iron Lake
South Red Iron Lake, South Dakota
623.94 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.67 degrees N, 97.32 degrees W - Marshall 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 South Red Iron Lake Stacks Up
- Larger than 84% of the 533 lakes counted in South Dakota.
- About 54 miles from Watertown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Meyer Slough | Marshall | 1.0 mi | 28.66 acres |
| Pete W Slough | Marshall | 1.1 mi | 32.37 acres |
| North Red Iron Lake | Marshall | 1.3 mi | 175.2 acres |
| Josephine Lake | Marshall | 1.5 mi | 101.07 acres |
| Sarah Lake | Marshall | 1.7 mi | 77.59 acres |
| Clear Lake | Marshall | 2.5 mi | 1,198.96 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About South Red Iron Lake
How Big Is South Red Iron Lake?
South Red Iron Lake covers 623.94 acres in Marshall County, South Dakota.
What Is the Largest Lake in Marshall County?
Buffalo Lakes is the largest lake in Marshall County, at 1,986.48 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 145087455). Verified October 30, 2026.