| Grassy Lake | |
|---|---|
&sq=&lang=&file=File:USA_Louisiana_relief_location_map.svg)  Grassy Lake &sq=&lang=&file=File:Usa_edcp_relief_location_map.png) Grassy Lake | |
| Location | St. Martin and Assumption, Parishes, Louisiana, US |
| Coordinates | 29°46′40″N 91°06′37″W / 29.7779°N 91.1104°W[1] |
| Type | Natural lake |
| Basin countries | United States (Watershed HUC 8080101) |
| Surface area | 414 ha (1,024 acres) |
| Average depth | 1.8 m (6 ft) |
| Max. depth | 2.7 m (9 ft) |
| Shore length1 | 12.400 km (7.705 mi) |
| Surface elevation | 0 m (0 ft)[2] |
| Settlements | Morgan City |
| 1 Shore length is not a well-defined measure. | |
Grassy Lake is 1,024 acres (414 ha), a natural lake, and is located in St. Martin and Assumption, Parishes, Louisiana. The 246,000 acres (1,000 km2) of watershed includes Lake Verret, Lake Palourde, all draining into the Atchafalaya River, and finally the Gulf of Mexico. Grassy Lake is almost entirely in St. Martin Parish but Assumption Parish runs along the east side, just west of the shoreline.