Lakes / South Dakota / Marshall County / Island Lake
Island Lake, Marshall County, South Dakota
145.55 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.72 degrees N, 97.29 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 Island Lake Stacks Up
- Larger than 53% of the 533 lakes counted in South Dakota.
- About 57 miles from Watertown, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Mud Lake | Marshall | 1.3 mi | 165.07 acres |
| Greys Lake | Marshall | 1.4 mi | 184.34 acres |
| Goodbird Lake | Marshall | 1.5 mi | 66.47 acres |
| Sarah Lake | Marshall | 2.0 mi | 77.59 acres |
| Wolf Lake | Marshall | 2.1 mi | 37.56 acres |
| North Red Iron Lake | Marshall | 2.5 mi | 175.2 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Island Lake
How Big Is Island Lake?
Island Lake covers 145.55 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 145087014). Verified October 30, 2026.