Grassy Lake
General data
- Name: Grassy Lake
- Water system: Atchafalaya River
- Water type: Natural lake
- Progression: Lake Palourde -> Atchafalaya River -> Gulf of Mexico -> Atlantic Ocean -> Planet Earth
- Climates: Subtropical
- Continents: North America
- Countries: United States of America
Grassy Lake is 414 ha natural lake, and is located in St. Martin and Assumption, Parishes, Louisiana. The 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.