Simpson Lake (South Dakota)
| Simpson Lake | |
|---|---|
| Location | Douglas County, South Dakota | 
| Coordinates | 43°23′44″N 98°24′46″W / 43.3956792°N 98.4127279°W | 
| Type | lake | 
| Surface elevation | 1,526 feet (465 m) | 
Simpson Lake is a former lake in South Dakota, in the United States.
Simpson Lake had the name of Seymour Simpson, a pioneer who settled there.