St. Louis Plantation
St. Louis Plantation  | |
| Location | Along St. Louis Road, about 325 yards (297 m) southwest of River Road (LA 405) | 
|---|---|
| Nearest city | Plaquemine, Louisiana | 
| Coordinates | 30°16′25″N 91°12′44″W / 30.27371°N 91.21218°W | 
| Area | 18 acres (7.3 ha) | 
| Built | 1858 | 
| Built by | Edward James Gay | 
| Architectural style | Greek Revival, Italianate | 
| NRHP reference No. | 75000849 | 
| Added to NRHP | December 3, 1975 | 
The St. Louis Plantation is a Southern plantation with a historic mansion located in Iberville Parish, Louisiana, United States.
Built in 1858, the mansion was a replacement for a previous house named Erwin's Castle which was built in 1808 at the same location and was destroyed by a flood in the early 1850s. It was later owned by Edward J. Gay, a member of Congress. The two story frame cottage, covered with clapboards, is sitting on a brick basement. It shows elements of Greek Revival and Italianate architecture.
It was listed on the National Register of Historic Places on December 3, 1975.