Ross Barnett Reservoir
General data
- Name: Ross Barnett Reservoir
- Water system: Pearl river (Gulf of Mexico)
- Water type: Artificial lake
- Progression: Pearl river (Gulf of Mexico) -> Gulf of Mexico -> Atlantic Ocean -> Planet Earth
- Climates: Subtropical
- Continents: North America
- Countries: United States of America
The Ross Barnett Reservoir, often called simply the Reservoir, is a reservoir of the Pearl River between Madison and Rankin counties in the U.S. state of Mississippi. The 130 km2 lake serves as the state's largest drinking water resource, and is managed by the Pearl River Valley Water Supply District. The lake features 169 km of shoreline impounded on the south by a 5.6 km man-made dam and spillway. The western shore is bounded by the historic Natchez Trace Parkway.