Swan Lake is a 116-acre (0.5 km2) reservoir on an unnamed tributary of the Middle Raccoon River, just south and east of Carroll, Iowa. It is the southern terminus of the Sauk Rail Trail, a path linking the lake to Black Hawk State Park in Sac County.
| Swan Lake | |
|---|---|
  Swan Lake  Swan Lake | |
 | |
| Location | Carroll County, Iowa, United States |
| Coordinates | 42°02′01″N 94°50′25″W / 42.0336°N 94.8403°W |
| Type | reservoir |
| Primary inflows | unnamed tributary to the Middle Raccoon River |
| Primary outflows | unnamed tributary to the Middle Raccoon River |
| Basin countries | United States |
| Surface area | 116 acres (0.5 km2) |
| Surface elevation | 1,263 ft (385 m) |