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. with three photo and a map With .

It was listed on the National Register of Historic Places on December 3, 1975.

See also List of plantations in Louisiana National Register of Historic Places listings in Iberville Parish, Louisiana

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