Lakes / South Dakota / McPherson County / Long Lake
Long Lake, McPherson County, South Dakota
364.48 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.85 degrees N, 99.27 degrees W - McPherson 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 Long Lake Stacks Up
- Larger than 77% of the 533 lakes counted in South Dakota.
- The largest lake in McPherson County among those counted.
- About 46 miles from Aberdeen, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Schumacher Lake | McPherson | 1.5 mi | 56.09 acres |
| Klooz Lake | McPherson | 2.5 mi | 207.07 acres |
| Rath Lake | McPherson | 8.7 mi | 179.89 acres |
| Alkali Lake | McPherson | 9.3 mi | 121.58 acres |
| Eureka Lake | McPherson | 19 mi | 188.54 acres |
| Hausauer Lake | McPherson | 19 mi | 76.6 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Long Lake
How Big Is Long Lake?
Long Lake covers 364.48 acres in McPherson County, South Dakota.
What Is the Largest Lake in McPherson County?
Long Lake is the largest lake in McPherson County, at 364.48 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 147892259). Verified October 30, 2026.