| Little Grassy Lake | |
|---|---|
&sq=&lang=&file=File:USA_Illinois_relief_location_map.svg)  Little Grassy Lake &sq=&lang=&file=File:Usa_edcp_relief_location_map.png) Little Grassy Lake | |
| Location | Jackson County, Illinois and Williamson County, Illinois |
| Coordinates | 37°38′12″N 89°08′44″W / 37.6368°N 89.1455°W |
| Type | reservoir |
| Primary inflows | Little Grassy Creek |
| Primary outflows | Little Grassy Creek |
| Basin countries | United States |
| Max. length | 4 mi (6.4 km) |
| Max. width | 0.5 mi (0.80 km) |
| Surface area | 1,200 acres (490 ha) |
| Shore length1 | 36 miles (58 km) |
| Surface elevation | 499 ft (152 m) [1] |
| 1 Shore length is not a well-defined measure. | |
Little Grassy Lake is a 1,200 acres (490 ha) reservoir in southern Illinois, created by the damming of Little Grassy Creek, a tributary of Crab Orchard Lake and the Big Muddy River. Most of the lake is located in Williamson County, southeast of Carbondale, Illinois. The lake is accessible from Giant City Road out of Carbondale, Illinois. Two arms of the lake penetrate into adjacent Jackson County. The lake is managed by the U.S. Fish and Wildlife Service as part of the Crab Orchard National Wildlife Refuge.