Bayou Pierre is a river in Louisiana[2] and Mississippi, United States.

It is a tributary of the Mississippi River merging just downstream from the town of St. Joseph, Louisiana on the opposite bank.

Bayou Pierre is the location of the present-day city of Port Gibson, Mississippi.

Settlers floated the Tennessee, Ohio, and Mississippi rivers in the early 1800s to get to the new territory because there were no roads except this short section of the Natchez trace.

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